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Electrochemical Co-reduction of Bi(Ⅲ)and Y(Ⅲ)and Extracting Yttrium from Molten LiCl-KCl Using Liquid Bi as Cathode
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作者 LI Mei LIU Yichuan +4 位作者 SUN Zhongxuan HAN Wei ZHANG Milin YANG Xiaoguang SUN Yang 《高等学校化学研究:英文版》 SCIE CAS CSCD 2019年第1期60-64,共5页
The electrochemical reaction of Bi(Ⅲ)and co-reduction behaviour of Bi(Ⅲ)and Y(Ⅲ)ions were researched in molten LiCl-KCl on a ttmgsten(W)electrode employing a range of electrochemical teclmiques.Cyclic voltammetric ... The electrochemical reaction of Bi(Ⅲ)and co-reduction behaviour of Bi(Ⅲ)and Y(Ⅲ)ions were researched in molten LiCl-KCl on a ttmgsten(W)electrode employing a range of electrochemical teclmiques.Cyclic voltammetric and square-wave voltanunetric results revealed that the reduction of Bi(Ⅲ)was a one-step process,with the exchange of three electrons on a W electrode,and diffusion-controlled.The electrochemical curves showed two reduction peaks pertaining to the formation of Bi-Y alloy compounds,because of the co-reduction of Bi(Ⅲ)and Y(Ⅲ) by metallic Y deposited on the pre-deposited Bi-coated W electrode and reacting with Bi metal in molten LiCl-KCl. Furthermore,galvanostatic electrolysis was conducted using liquid Bi as cathode to extract yttrium at different current intensities,and the extractive products were analyzed by SEM,EDS and XRD.The results indicated that BiY intermetallic compotmd was formed in the molten LiCl-KCl-YCl3 system. 展开更多
关键词 ELECTROCHEMICAL co-reduction:Electrochemical behaviour Bi-Y intennetallic compound GALVANOSTATIC ELECTROLYSIS
Electrochemical analysis and convection-enhanced mass transfer synergistic effect of MnO_x/Ti membrane electrode for alcohol oxidation
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作者 Hong Wang Xin Wei +3 位作者 Yujun Zhang Ronghua Ma Zhen Yin Jianxin Li 《中国化学工程学报:英文版》 SCIE EI CAS CSCD 2019年第1期150-156,共7页
The different electrocatalytic reactors could be constructed for the electrocatalytic oxidation of 2,2,3,3-tetrafluoro-1-propanol(TFP) with two typical MnOx/Ti electrodes, i.e.the electrocatalytic membrane reactor(ECM... The different electrocatalytic reactors could be constructed for the electrocatalytic oxidation of 2,2,3,3-tetrafluoro-1-propanol(TFP) with two typical MnOx/Ti electrodes, i.e.the electrocatalytic membrane reactor(ECMR) with the Ti membrane electrode and the electrocatalytic reactor(ECR) with the traditional Ti plate electrode.For the electro-oxidation of TFP, the conversion with membrane electrode(70.1%) in the ECMR was 3.3 and 1.7 times higher than that of the membrane electrode without permeate flow(40.8%) in the ECMR and the plate electrode(21.5%) in the ECR, respectively.Obviously, the pore structure of membrane and convection-enhanced mass transfer in the ECMR dramatically improved the catalytic activity towards the electro-oxidation of TFP.The specific surface area of porous electrode was 2.22 m2·g-1.The surface area of plate electrode was 2.26 cm2(1.13 cm2× 2).In addition, the electrochemical results showed that the mass diffusion coefficient of the MnOx/Ti membrane electrode(1.80 × 10-6 cm2·s-1) could be increased to 6.87 × 10-6 cm2·s-1 at the certain flow rate with pump, confirming the lower resistance of mass transfer due to the convection-enhanced mass transfer during the operation of the ECMR.Hence, the porous structure and convection-enhanced mass transfer would improve the electrochemical property of the membrane electrode and the catalytic performance of the ECMR,which could give guideline for the design and application of the porous electrode and electrochemical reactor. 展开更多
关键词 Electrocatalytic MEMBRANE REACTOR (ECMR) MnOx/Ti MEMBRANE electrode Electro-oxidation of 2 2 3.3-tetrafluoro-1-propanol(TFP) ELECTROCHEMICAL REACTOR (ECR) ELECTROCHEMICAL measurement
含聚合物污水电化学处理中油珠与气泡的变化及对除油效果的影响 预览
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作者 朱宗全 靖波 +2 位作者 王秀军 杨航 尹先清 《油田化学》 CAS CSCD 北大核心 2019年第1期163-168,共6页
为提高电化学除油效果,通过形态原位识别技术分析电化学方法处理油田含聚合物污水的动态过程中油珠和气泡的聚集形态变化,利用絮体分形理论描述了油珠和气泡的分形成长特征,用分形维数表征了电化学处理时间对二者的影响及变化规律,研究... 为提高电化学除油效果,通过形态原位识别技术分析电化学方法处理油田含聚合物污水的动态过程中油珠和气泡的聚集形态变化,利用絮体分形理论描述了油珠和气泡的分形成长特征,用分形维数表征了电化学处理时间对二者的影响及变化规律,研究了油珠和气泡变化对除油效果的影响。结果表明,气泡分时形态变化较小,其分形维数(Df)在2.05附近波动;油珠分时形态变化较大,随着处理时间的延长油珠粒径变大,其Df在1.804数1.964之间,二者的形态与分形维数呈现良好的相关性。输出电流越大,气泡的平均当量圆直径(de)越小,除油效果越好。在电化学处理过程中,油珠与气泡发生黏附,随着处理时间延长油珠在气泡的作用下快速聚集,加快了油珠的上浮分离,气泡de变小,油珠平均当量圆直径(dn)变大。在处理电流为4A、动态停留时间(t2)为25min时,气泡de为49.72μm,油珠dn为57.39μm,除油率达到86.15%;电流为8A时,t2在10数20min的除油率大于80%。较高输出电流、较短的动态停留时间或较低输出电流、较长的停留时间均有利于改善除油效果。 展开更多
关键词 电化学 污水 聚合物 油珠 气泡 形态分析 分形维数 除油效果
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Utilization of the superior properties of highly mesoporous PVP modified NiCo2O4 with accessible 3D nanostructure and flower-like morphology towards electrochemical methanol oxidation reaction 预览
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作者 Gracita M.Tomboc Medhen W.Abebe +1 位作者 Anteneh F.Baye Hern Kim 《能源化学:英文版》 SCIE EI CAS CSCD 2019年第2期136-146,共11页
Up to this date,researchers are still facing difficulties to expand the technology of direct methanol fuel cells(DMFCs) because of the high overpotential required to oxidize the methanol and its relatively poor perfor... Up to this date,researchers are still facing difficulties to expand the technology of direct methanol fuel cells(DMFCs) because of the high overpotential required to oxidize the methanol and its relatively poor performance due to CO poisoning of the leading-high cost anode catalyst.In line with this,we have successfully modified the morphological structure and composition of low cost cobalt based-metal oxides,MCo2O4(M = Zn and Ni),with the simple and noble use of polyvinyl pyrrolidone(PVP) as growth modifier and surface stabilizer during the synthesis of nanoparticles in our previous reports,which shown high electrocatalytic activity and strong stability.Due to the good performance of our PVP modified MCo2O4 towards pseudocapacitor and oxygen evolution reaction applications,we decided to extend our research study to methanol oxidation reaction.Remarkably,PVP modified Ni Co2O4 electrode directly grown on nickel foam substrate via a simple hydrothermal process exhibited better performance compared with PVP modified ZnCo2O4 and NiCo2O4 without PVP.It had obtained a remarkably low onset potential of 0.285 V and high current density of 280 m A cm-2,and shown great stability and high poison tolerance during a continuous CV cycling and Chronoamperometry test,which attained high efficiency of 86.86%and 98.52%,respectively.These positive results of PVP modified Ni Co2O4 electrode towards MOR might be attributed to its hierarchical 3 D nanostructures with highly mesoporous surface and large surface area which may have provided numerous electroactive sites,and the exceptional corrosion stability of Ni Co2O4 electrode in alkaline solution. 展开更多
关键词 NiCo2O4 3D NANOSTRUCTURE ELECTROCHEMICAL METHANOL oxidation Current density
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Ti35合金在含氟离子硝酸中电化学腐蚀行为
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作者 徐建平 苏航标 +3 位作者 郭荻子 赵永庆 许并社 周廉 《稀有金属材料与工程》 SCIE EI CAS CSCD 北大核心 2019年第4期1124-1129,共6页
采用电化学测试系统测试了Ti35合金在含有不同氟离子浓度的6mol/L硝酸溶液中的开路电位(OCP)、极化曲线、电化学阻抗谱(EIS),探讨了氟离子对Ti35合金耐蚀性能的影响。结果表明:随着氟离子浓度的增加,合金耐蚀性下降,但总体而言合金仍具... 采用电化学测试系统测试了Ti35合金在含有不同氟离子浓度的6mol/L硝酸溶液中的开路电位(OCP)、极化曲线、电化学阻抗谱(EIS),探讨了氟离子对Ti35合金耐蚀性能的影响。结果表明:随着氟离子浓度的增加,合金耐蚀性下降,但总体而言合金仍具有良好的耐蚀性。影响合金耐蚀性转变的氟离子浓度临界值约为1.25 mmol/L,进一步应用混合电位理论,解释合金耐蚀性转变的原因。 展开更多
关键词 钛合金 氟离子 腐蚀行为 电化学
稀土元素对镁合金磷酸盐转化膜性能的影响 预览
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作者 王瑶 邵忠财 +2 位作者 王鑫 吴梦岐 李岫元 《电镀与环保》 CAS CSCD 北大核心 2019年第2期30-33,共4页
采用化学转化法在镁合金表面制备了磷酸盐转化膜,并研究了稀土元素钕和铈对磷酸盐转化膜性能的影响。结果表明:向磷酸盐转化液中加入钕元素或铈元素时,磷酸盐转化膜的耐蚀性均显著提高。加入0.4g/L钕元素和0.4g/L铈元素时,磷酸盐转化膜... 采用化学转化法在镁合金表面制备了磷酸盐转化膜,并研究了稀土元素钕和铈对磷酸盐转化膜性能的影响。结果表明:向磷酸盐转化液中加入钕元素或铈元素时,磷酸盐转化膜的耐蚀性均显著提高。加入0.4g/L钕元素和0.4g/L铈元素时,磷酸盐转化膜的耐硫酸铜点滴时间分别可以达到50.2s和54.2s。添加稀土元素未改变磷酸盐转化膜的表面形貌和组成。另外,加入0.4g/L铈元素时,磷酸盐转化膜的耐蚀性最好。 展开更多
关键词 镁合金 磷酸盐转化膜 稀土元素 耐蚀性 电化学
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Effect of chloride ion on corrosion behavior of low carbon steel in 0.1 M NaHCO3 solution with different dissolved oxygen concentrations
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作者 Fang Xue Xin Wei +2 位作者 Junhua Dong Changgang Wang Wei Ke 《材料科学技术学报:英文版》 SCIE EI CAS CSCD 2019年第4期596-603,共8页
The corrosion behavior of low carbon steel in 0.1 M NaHCO3+ 0.1 M NaCl solution with different dissolved oxygen concentrations was investigated with gravimetric tests and electrochemical measurements.Results show that... The corrosion behavior of low carbon steel in 0.1 M NaHCO3+ 0.1 M NaCl solution with different dissolved oxygen concentrations was investigated with gravimetric tests and electrochemical measurements.Results show that the corrosion mass loss of steel is remarkably increased with the addition of chloride ion. In the initial stage, the carbon steel tends to active dissolution due to the dissolution effect of chloride ion on the oxide film;as a result, the corrosion potential maintains as low values. With the immersion time going by, the corrosion potential of the steel is promoted as a result of the accumulation of the corrosion products. However, the rust layer is loose and porous due to the deteriorating effect of chloride ion, which decreases the reduction resistance of oxygen. Meanwhile, the porous rust layer could be repaired by the depolarization of oxygen. Under the synergistic effect of chloride ion and oxygen, the corrosion of the steel is accelerated during the repeated process of dissolution and reparation of the oxide film. 展开更多
关键词 Carbon steel CHLORIDE ion Electrochemical measurements RUST characterization LOCALIZED corrosion
Passivity breakdown of 13Cr stainless steel under high chloride and CO2 environment 预览
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作者 Hui-xin Li Da-peng Li +3 位作者 Lei Zhang Ya-wen Wang Xiu-yun Wang Min-xu Lu 《矿物冶金与材料学报:英文版》 SCIE EI CAS CSCD 2019年第3期329-336,共8页
Herein, the effect of high chloride ion (Cl^-) concentration on the corrosion behavior and passive film breakdown of 13Cr martensitic stainless steel under CO2 environment was demonstrated. The Cl^- concentration was ... Herein, the effect of high chloride ion (Cl^-) concentration on the corrosion behavior and passive film breakdown of 13Cr martensitic stainless steel under CO2 environment was demonstrated. The Cl^- concentration was varied from 30 to 150 g/L and cyclic potentiodynamic polarization was conducted to investigate the influence of the Cl^- concentration on the corrosion potential (Ecorr), passive breakdown potential (Epit), and repassivation potential (Erep). The results of the polarization curves revealed that 13Cr stainless steel is susceptible to pitting under high Cl^- concentration. The passive breakdown potential and repassivation potential decreased with the increase of Cl^- concentration. The semiconducting behavior of the passive film was investigated by Mott-Schottky analysis and the point defect model (PDM). It was observed that the iron cation vacancies and oxygen vacancies were continuously generated by autocatalytic reactions and the higher Cl^- concentration resulted in higher vacancies in the passive film. Once the excess vacancies condensed at the metal/film interface, the passive film became locally detached from the metal, which led to the breakdown of the passive film. 展开更多
关键词 13Cr STAINLESS steel electrochemical characterization PITTING corrosion high CHLORIDE concentration PASSIVE film BREAKDOWN
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Corrosion behavior of Ni-based coating containing spherical tungsten carbides in hydrochloric acid solution
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作者 Shan-shan Liu Hai-yan Chen +3 位作者 Xuan Zhao Li Fan Xiao-ming Guo Yan-sheng Yin 《钢铁研究学报:英文版》 SCIE EI CAS CSCD 2019年第2期191-199,共9页
A Ni-based alloy coating with 30 wt.%spherical fungsten carbide particles was prepared through plasma transferred arc welding on 42CrMo steel.The composition and microstructure of the coati ng were examined through X-... A Ni-based alloy coating with 30 wt.%spherical fungsten carbide particles was prepared through plasma transferred arc welding on 42CrMo steel.The composition and microstructure of the coati ng were examined through X-ray diffraction and scanning electron microscopy with energy-dispersive spectrometry.The corrosion behaviors of the coating compared to the Ni coating without tungsten carbide particles and to the bare substrate in a0.5 mol/L HC1 solution were presented through polarization curves,electrochemical impedance spectroscopy(EIS)measurements and long-term immersion tests.The results demonstrated that the composite coating microstructure comprised Ni matrix,Ni-rich phase,tungsten carbide particles,W-rich phase and Cr-rich phase.The polarization curves and EIS measurements presented that a passivation film,which mainly included Ni,Cr,Fe and W oxides,was formed in the composite coating that protected the substrate from corrosion by HC1 solution.In the immersion tests,a micro-galvanic reaction at the new-formed phases and Ni matrix interface caused severe pit corrosion and Ni matrix consumption.The debonding of Ni-rich and W-rich phases could be observed with the immersion time extension.The tungsten carbide particles and Cr-rich phase were still attached on the surface for up to 30 days. 展开更多
关键词 Plasma TRANSFERRED welding SPHERICAL TUNGSTEN CARBIDE NI-BASED coating Corrosion resistance Electrochemical impedanee spectroscopy
基于快速伏安法电化学检测仪设计与实现 预览
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作者 刘鹏 邬杨波 +2 位作者 孟维强 陈庚 郭智勇 《高技术通讯》 CAS 北大核心 2019年第2期195-201,共7页
针对目前大多数便携式电化学检测仪的灵敏度低、检测速度慢、显示操作单一等现状,设计了基于快速伏安法的硬件检测平台。硬件系统包括控制器、恒电位仪电路、I/V转换电路和信号源4部分。控制器用于完成循环伏安图的显示和人机交互工作... 针对目前大多数便携式电化学检测仪的灵敏度低、检测速度慢、显示操作单一等现状,设计了基于快速伏安法的硬件检测平台。硬件系统包括控制器、恒电位仪电路、I/V转换电路和信号源4部分。控制器用于完成循环伏安图的显示和人机交互工作。恒电位仪用来保证电化学池中工作电极与参比电极电位差稳定。I/V转换电路完成电流电压的转换及信号放大。信号源产生电化学检测所需的输入信号。测试表明:信号源输出幅值分辨率高、频率精度高,恒电位仪系统输出具有较好的线性度,通过对10mmol/L二茂铁(Fe(C5H5)2)溶液检测,峰电流大小正比于扫描速率,符合系统设计要求。 展开更多
关键词 硬件检测平台 快速伏安法 恒电位仪 电化学 信号源
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Zr含量对磁控溅射NiCrZr薄膜结构及耐蚀性的影响 预览
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作者 孙康 崔洪芝 +2 位作者 田硕硕 宋晓杰 王维国 《表面技术》 EI CAS CSCD 北大核心 2019年第2期186-192,共7页
目的在316L不锈钢基体表面磁控溅射NiCrZr薄膜,提高其在3.5%NaCl溶液中的耐蚀性。方法采用非平衡磁控溅射技术,在316L不锈钢基体上,用NiCr(原子比80:20)复合靶和纯Zr靶制备了不同Zr含量的NiCrZr薄膜。采用XRD、原子力显微镜、扫描电镜和... 目的在316L不锈钢基体表面磁控溅射NiCrZr薄膜,提高其在3.5%NaCl溶液中的耐蚀性。方法采用非平衡磁控溅射技术,在316L不锈钢基体上,用NiCr(原子比80:20)复合靶和纯Zr靶制备了不同Zr含量的NiCrZr薄膜。采用XRD、原子力显微镜、扫描电镜和Gamry电化学工作站,分别分析了NiCrZr薄膜的物相组成、表面形貌、表面粗糙度、截面形貌、元素组成、厚度以及在3.5%NaCl溶液中的电化学腐蚀性能。结果随着Zr靶功率的增加,薄膜中Zr含量不断增加,薄膜的组织结构不断细化,表面粗糙度由4.91nm减小到了2.79nm。薄膜主要由Cr3Ni2、Cr1.2Ni0.8Zr、Cr2Zr、CrO3、NiCrO4和ZrO2相组成,表明薄膜容易在空气中氧化。此外,随着Zr含量的增加,与316L基体相比,NiCrZr薄膜在3.5%NaCl溶液中的腐蚀电流减小,腐蚀电位增大。当Zr原子分数为24.73%时,NiCrZr薄膜可以在溶液中形成稳定的钝化膜,从而表现出最佳的耐蚀性,腐蚀电流密度达到最小值13.10nA/cm2,与316L基体相比减小了95%。结论Zr含量的增加可以使薄膜变得更加细密,有效阻隔电解质与基体的接触,从而提高涂层的耐蚀性。 展开更多
关键词 磁控溅射 NiCrZr薄膜 微观结构 电化学 耐蚀性
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醚溶剂搭配离子液体对锂硫电池性能的影响 预览
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作者 陈真 卢海 +1 位作者 符继川 杜慧玲 《电池》 CAS CSCD 北大核心 2019年第2期101-104,共4页
分别选择乙二醇二甲醚(DME)和1,1,2,2-四氟乙基-2,2,3,3-四氟丙基醚(TF)作为离子液体1-乙基-3-甲基咪唑双三氟甲磺酰亚胺盐(EMITFSI)的共溶剂配制锂硫电池电解液。通过线性扫描、恒流充放电、循环伏安和交流阻抗等技术,研究溶剂组成对... 分别选择乙二醇二甲醚(DME)和1,1,2,2-四氟乙基-2,2,3,3-四氟丙基醚(TF)作为离子液体1-乙基-3-甲基咪唑双三氟甲磺酰亚胺盐(EMITFSI)的共溶剂配制锂硫电池电解液。通过线性扫描、恒流充放电、循环伏安和交流阻抗等技术,研究溶剂组成对电解液性质和电池电化学性能的影响。在离子液体中按同体积加入TF基本上不影响电解液的稳定电位窗口和离子电导率,但有利于减少多硫化物溶解、改善电极表面成膜性质,EMI-TF电解液的电池0.1C,在1.5~3.0V下,首次放电比容量约800mAh/g,经40次循环后比容量为548mAh/g,库仑效率接近100%。加入DME的电解液提高了电导率(14.2mS/cm)、降低了锂界面阻抗,但也促进了多硫化物的溶解与穿梭,因此EMI-DME电解液虽然获得了较高的初始容量,但是无法抑制循环期间快速的容量衰减。 展开更多
关键词 锂硫电池 电解液 离子液体 电化学性能
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SnO2-Sb/碳纳米管复合电极的制备及催化降解低浓度头孢他啶
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作者 段平洲 黄鸽 黎胡翔 《环境化学》 CAS CSCD 北大核心 2019年第5期991-998,共8页
利用溶胶凝胶法制备了SnO2-Sb掺杂碳纳米管复合材料,采用热压法将其固定在不锈钢网上制成平面二维电极,借助SEM、XRD对其形貌、微观结构及元素结构进行分析,通过循环伏安曲线(CV)、极化曲线(Tafel),线性伏安(LVS)对其电化学性质进行了表... 利用溶胶凝胶法制备了SnO2-Sb掺杂碳纳米管复合材料,采用热压法将其固定在不锈钢网上制成平面二维电极,借助SEM、XRD对其形貌、微观结构及元素结构进行分析,通过循环伏安曲线(CV)、极化曲线(Tafel),线性伏安(LVS)对其电化学性质进行了表征.结果显示,锡锑金属均匀地负载到了碳纳米管上且具有良好的电催化活性和稳定性,金属的掺杂使得碳纳米管电极具有更高的析氧电位和更小的阻抗.使用荧光光谱法测试了羟基自由基的产生能力,通过循环5次降解实验验证了电极的稳定性.降解实验表明,SnO2-Sb/碳纳米管电极对低浓度头孢他啶具有很高的降解效率,在2 mA·cm^-2的电流强度下,60 min内可以达到90%的去除率.最后,针对不同的电解质和电流强度对电催化降解效率的影响,也通过实验数据进行了分析. 展开更多
关键词 碳纳米管 锡锑掺杂 头孢他啶 电催化 降解
High-Index-Faceted Ni3S2 Branch Arrays as Bifunctional Electrocatalysts for Efficient Water Splitting
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作者 Shengjue Deng Kaili Zhang +8 位作者 Dong Xie Yan Zhang Yongqi Zhang Yadong Wang Jianbo Wu Xiuli Wang Hong Jin Fan Xinhui Xia Jiangping Tu 《纳微快报:英文版》 CAS CSCD 2019年第1期205-216,共12页
For efficient electrolysis of water for hydrogen generation or other valueadded chemicals,it is highly relevant to develop low-temperature synthesis of low-cost and high-e ciency metal sulfide electrocatalysts on a la... For efficient electrolysis of water for hydrogen generation or other valueadded chemicals,it is highly relevant to develop low-temperature synthesis of low-cost and high-e ciency metal sulfide electrocatalysts on a large scale.Herein,we construct a new core–branch array and binder-free electrode by growing Ni3S2 nanoflake branches on an atomic-layer-deposited(ALD)TiO2 skeleton.Through induced growth on the ALD-TiO2 backbone,cross-linked Ni3S2 nanoflake branches with exposed{210}highindex facets are uniformly anchored to the preformed TiO2 core forming an integrated electrocatalyst.Such a core–branch array structure possesses large active surface area,uniform porous structure,and rich active sites of the exposed{210}high-index facet in the Ni3S2 nanoflake.Accordingly,the TiO2@Ni3S2 core/branch arrays exhibit remarkable electrocatalytic activities in an alkaline medium,with lower overpotentials for both oxygen evolution reaction(220 mV at 10 mA cm-2)and hydrogen evolution reaction(112 m V at 10 mA cm-2),which are better than those of other Ni3S2 counterparts.Stable overall water splitting based on this bifunctional electrolyzer is also demonstrated. 展开更多
关键词 Nickel sulfide Core/branch ARRAYS Porous film BIFUNCTIONAL ELECTROCATALYSTS Electrochemical water splitting Oxygen EVOLUTION reaction(OER) Hydrogen EVOLUTION reaction(HER)
低温电化学合成氨阴极催化剂研究进展 预览
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作者 宋东章 景俊萌 唐孟尧 《电源技术》 CAS 北大核心 2019年第5期904-906,共3页
电化学合成氨可在低温、常压下进行,是传统合成氨最有效的替代方法之一。阴极催化剂的优化是提高电化学合成氨性能的关键所在。介绍了电化学合成氨电解池,讨论了低温电化学合成氨阴极催化剂的研究成果及研究现状,分析了不同阴极催化剂... 电化学合成氨可在低温、常压下进行,是传统合成氨最有效的替代方法之一。阴极催化剂的优化是提高电化学合成氨性能的关键所在。介绍了电化学合成氨电解池,讨论了低温电化学合成氨阴极催化剂的研究成果及研究现状,分析了不同阴极催化剂存在的问题,展望了其未来的发展方向。 展开更多
关键词 电化学 合成氨 低温 阴极催化剂
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A flexible solid-state supercapacitor based on graphene/polyaniline paper electrodes 预览
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作者 Kang Li Xuanli Liu +2 位作者 Song Chen Wei Pan Jintao Zhang 《能源化学:英文版》 SCIE EI CAS CSCD 2019年第5期166-173,共8页
The direct coating of graphene sheets obtained by electrochemical exfoliation on commercial paper renders the preparation of highly conductive flexible paper substrate for subsequent deposition of polyaniline (PANi) n... The direct coating of graphene sheets obtained by electrochemical exfoliation on commercial paper renders the preparation of highly conductive flexible paper substrate for subsequent deposition of polyaniline (PANi) nanorods via electrochemical polymerization. The deposit ion of PANi can be well-controlled by adjusting the electrochemical polymerization time, leading to the formation of PANi coated graphene paper (PANi-GP). The as-prepared electrode exhibited high areal capacitance of 176 mF cm^-2 in three-electrode system at a current density of 0.2 mA cm^-2 which is around 10 times larger than that of pris-tine graphene paper due to the pseudocapacitive behavior of PANi. In-situ Raman test was used to determine the molecular changes during redox process of PANi. More importantly, all-solid-state symmetric capacitor assembled with two PANi-GP electrodes in a polymer electrolyte delivered an areal capacitanee of 123 mF cm^-2, corresponding to an areal energy density of 17.1 μWh cm^-2 and an areal power density of 0.25 mW cm^-2. The symmetric capacitor held a capacitive retention of 74.8% after 500 bending tests from 0 to 120°, suggesting the good flexibility and mechanical stability. These results showed the great promising application in flexible energy-storage devices. 展开更多
关键词 GRAPHENE POLYANILINE FLEXIBLE SUPERCAPACITOR Electrochemical EXFOLIATION
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Synthesis, Structure and Electrocatalytic Activity of Perfluorinated Covalent Triazine-based Framework 预览
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作者 王元双 温珍海 《结构化学》 SCIE CAS CSCD 2019年第2期233-241,166共10页
Using the bottom-up method, we synthesized a series of perfluorinated covalent triazine-based frameworks (FCTFs) with porous structures for catalysis oxygen reduction reaction (OR.R). The evolved FCTFs by high-tempera... Using the bottom-up method, we synthesized a series of perfluorinated covalent triazine-based frameworks (FCTFs) with porous structures for catalysis oxygen reduction reaction (OR.R). The evolved FCTFs by high-temperature carbonization show an apparent variation in electrocatalytic activity toward the ORR dependent on the type of F. The samples synthesized at 900 ℃(FCTF-900) exhibits advantages in terms of high activity, high durability, and methanol-tolerant as an efficient electrocatalyst for ORR, manifests a comparable or even better activity as compared with the commercial Pt/C catalysts not only in alkaline media but also in acidic and neutral electrolyte. 展开更多
关键词 electrochemical reduction porous polymers COVALENT triazine-based FRAMEWORK ionothermal polymerization
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Excellent Electrochemical Performances of Intrinsic Polyaniline Nanofibers Fabricated by Electrochemical Deposition
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作者 陈韶云 LIU Ben +6 位作者 WANG Yuan CHENG Huan ZHANG Xingying XU Shaoqin LIU Hui LIU Wenfeng 胡成龙 《武汉理工大学学报:材料科学英文版》 SCIE EI CAS 2019年第1期216-222,共7页
A simple route to synthesize the polyaniline(PANI) nanofibers with diameter about 150 nm was reported. In this strategy, the PANI nanofibers were fabricated by electrochemical deposition by using two-electrode configu... A simple route to synthesize the polyaniline(PANI) nanofibers with diameter about 150 nm was reported. In this strategy, the PANI nanofibers were fabricated by electrochemical deposition by using two-electrode configuration in 0.01 M aniline and 0.01 M H2SO4 electrolytes. The as-prepared materials were characterized by scanning electron microscopy(SEM), infrared spectroscopy(FTIR), Raman spectroscopy and thermogravimetric analysis(TGA). The electrochemical properties of the PANI nanofibers electrode as supercapacitor materials were investigated. The PANI nanofibers electrode showed high capacitance of 485 F·g-1at 0.1 A·g-1, and the decrease in the specific capacitance is about 3.5% in 1 000 cycles. The results indicate that the PANI nanofibers electrode shows high stability and retains its electrochemical capacitance property over 1 000 cycles, suggesting PANI nanofibers have promising applications in high-performance supercapacitors. 展开更多
关键词 POLYANILINE NANOFIBERS NANOSTRUCTURED ELECTRODES electrochemical capacitors
Effect of scanning speeds on electrochemical corrosion resistance of laser cladding TC4 alloy
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作者 冯晓甜 雷剑波 +1 位作者 顾宏 周圣丰 《中国物理B:英文版》 SCIE EI CAS CSCD 2019年第2期383-390,共8页
In order to study the effect of scanning speed on the electrochemical corrosion resistance of laser cladding TC4 alloy in artificial seawater, the x-ray diffraction analysis, microstructure of cross-section, microhard... In order to study the effect of scanning speed on the electrochemical corrosion resistance of laser cladding TC4 alloy in artificial seawater, the x-ray diffraction analysis, microstructure of cross-section, microhardness variation, and impedance spectrum have been studied in comparison with the TC4 titanium alloy. The results show that the main phase of cladding coating is α-Ti, and the change of scanning speed has no obvious effect on it;therefore, the supersaturated α-Ti solid solution is formed, and the acicular α martensite is obtained. As the scanning speed increases, the microstructure of cladding coating is orthogonal basket-weave, the crystal surface spacing decreases, and the average microhardness of laser cladding TC4 alloy slightly increases. When the scanning speed increases to 10 mm/s, the microhardness is about 14.71%higher than that of the substrate, and the electrochemical corrosion resistance of laser cladding TC4 alloy is also improved,which is about 2.48 times more than the substrate. Grain refinement has a great effect on enhancing the anti-electrochemical corrosion. 展开更多
关键词 laser CLADDING TC4 alloy grain REFINEMENT ELECTROCHEMICAL corrosion
A competitive microcystin-LR immunosensor based on Au NPs@metal-organic framework(MIL-101)
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作者 Kunlei Zhang Kun Dai +6 位作者 Ruyan Bai Yuchan Ma Yan Deng Delei Li Xi Zhang Rong Hu Yunhui Yang 《中国化学快报:英文版》 SCIE CAS CSCD 2019年第3期664-667,共4页
An electrochemical immunosensor was developed for ultrasensitive detection of microcystin-LR in water. MIL-101, a porous metal-organic frameworks(MOFs) material based on trivalent chromium skeleton were synthesized by... An electrochemical immunosensor was developed for ultrasensitive detection of microcystin-LR in water. MIL-101, a porous metal-organic frameworks(MOFs) material based on trivalent chromium skeleton were synthesized by hydrothermal synthesis method, and loaded with Au nanoparticles(Au NPs) to prepare Au NPs@MIL-101 composite materials which were used as a marker to label anti microcystin-LR(Anti-MC-LR). The composite materials have strong catalytic properties to the oxidation of ascorbic acid. Anti-MC-LR was immobilized on glassy carbon electrode surface using electrodeposition graphene oxide(GO) as an immobilization matrix to construct a competitive microcystin-LR immunosensor. The electrochemical immunosensor display linear relationship in the range of 0.05 ng/mL-75 μg/mL with linear correlation coefficient of 0.9951 and detection limit of 0.02 ng/mL(S/N = 3). This sensor was used to detect microcystin-LR in the water sample. The recovery was 102.43%,which is satisfied. The good testing results indicate the sensor has a great prospect in practical application. 展开更多
关键词 MICROCYSTIN-LR METAL-ORGANIC frameworks MIL-101 COMPETITIVE ELECTROCHEMICAL IMMUNOSENSOR
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