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钴/氮共掺杂多孔类石墨烯催化剂的制备及其高效氧还原性能表征
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作者 刘磊 张建 +1 位作者 麻伍军 黄云辉 《中国科学:材料科学(英文版)》 CSCD 2019年第3期359-367,共9页
本文通过纳米硅作为保护层结合高温热解得到一种新型钴/氮共掺杂多孔类石墨烯纳米碳材料氧还原催化剂(Co/N-GLC).结果显示, Co/N-GLC具有类似于石墨烯的碳纳米薄层结构,并展现出分级多孔(微孔/介孔)特性,其比表面积高达809 m2g-1;此外, ... 本文通过纳米硅作为保护层结合高温热解得到一种新型钴/氮共掺杂多孔类石墨烯纳米碳材料氧还原催化剂(Co/N-GLC).结果显示, Co/N-GLC具有类似于石墨烯的碳纳米薄层结构,并展现出分级多孔(微孔/介孔)特性,其比表面积高达809 m2g-1;此外, Co/N-GLC还拥有较高的吡啶氮和石墨氮含量.这些优异的特性使得Co/N-GLC在碱性介质中具有出色的氧还原活性,接近于商业Pt/C催化剂.同时,在锌空气电池测试中, Co/N-GLC具有接近Pt/C电极的放电性能和优异的稳定性,表明该催化剂有望替代贵金属催化剂,具有很好的应用前景. 展开更多
关键词 graphene-like NANOCARBON OXYGEN reduction reaction ELECTROCATALYST zinc-air BATTERY
Recent progress on earth abundant electrocatalysts for hydrogen evolution reaction(HER)in alkaline medium to achieve efficient water splitting-A review 预览
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作者 Jamesh Mohammed-Ibrahim xiaoming Sun 《能源化学:英文版》 SCIE EI CAS CSCD 2019年第7期111-160,共50页
Developing earth-abundant-electrocatalysts for hydrogen evolution reaction is one of the promising ways to achieve efficient water-splitting for hydrogen production(a clean chemical fuel).This paper reviews the activi... Developing earth-abundant-electrocatalysts for hydrogen evolution reaction is one of the promising ways to achieve efficient water-splitting for hydrogen production(a clean chemical fuel).This paper reviews the activity,stability and durability for hydrogen evolution reaction in alkaline medium of different types of recently reported potential electrocatalysts such as Ni,Co,NiCo,Fe,Cu,W,Mo,Se,Mn.Zn,V,and metal free based earth-abundant-electrocatalysts.Further,this paper reviews the strategies used to achieve the remarkably low overpotential(including r/i0:<35mV),high long term stability(including^:100 h)and high durability(including>5000 cycles)of potential earth-abundant-electrocatalysts for hydrogen evolution reaction in alkaline medium and those are better or well comparable with the state-of-the-art,noble,Pt/C electrocatalyst.Finally,this paper summarizes the efficient strategies such as preparing porous structured materials,preparing nanostructured materials with superaerophobic surface,preparing nanostructured materials,preparing carbon composites/integrating electrocatalysts with carbon,preparing amorphous materials,preparing materials w让h oxygen vacancies/defects,preparing metal chalcogenides,preparing bimetallic/multi-metallic materials,doping metals or heteroatoms,preparing electrocatalysts with core-shell structure,decorating electrocatalysts with amines,preparing homojunction/heterojunction structured materials,preparing hollow structured materials,and preparing boronrich surface to enhance the activity,stability,and durability for HER. 展开更多
关键词 HER ELECTROCATALYST ELECTROCHEMICAL water SPLITTING EARTH abundant ELECTROCATALYST Hydrogen energy
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Well-aligned NiPt alloy counter electrodes for high-efficiency dye-sensitized solar cell applications 预览
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作者 Zhibin Pang Yuanyuan Zhao +3 位作者 Yanyan Duan Jialong Duan Qunwei Tang Liangmin Yu 《能源化学:英文版》 SCIE EI CAS CSCD 2019年第3期49-56,共8页
Development of cost-effective and robust counter electrodes (CEs) is a persistent objective for high-efficiency dye-sensitized solar cells (DSSCs). To achieve this goal, we present here the hydrothermal syn-thesis of ... Development of cost-effective and robust counter electrodes (CEs) is a persistent objective for high-efficiency dye-sensitized solar cells (DSSCs). To achieve this goal, we present here the hydrothermal syn-thesis of well-aligned NiPt alloy CEs, which is templated by ZnO nanowires and nanosheets. The prelim-inary results demonstrate that NiPt alloy electrodes are featured by increased charge-transfer processes and electrocatalytic activity in comparison with expensive Pt CE, yielding power conversion efficiencies of 8.29% and 7.41% in corresponding DSSCs with NiPt nanowire and nanosheet alloy CEs, respectively. Ad-ditionally, the NiPt alloy CEs also display extraordinary dissolution-resistant ability when suffering long-term utilization in liquid-junction DSSCs. 展开更多
关键词 DYE-SENSITIZED solar cell COUNTER electrode ALLOY ELECTROCATALYST
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电化学二氧化碳还原中的铜基催化剂(英文)
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作者 杨帆 邓培林 +2 位作者 韩优嘉 潘静 夏宝玉 《电化学》 CAS CSCD 北大核心 2019年第4期426-444,共19页
由于不断增加的二氧化碳排放导致全球变暖,且能源短缺等问题日益恶化,将二氧化碳电化学还原为高附加值化学品和燃料引起了极大的兴趣,设计高效催化剂对实现二氧化碳的高效选择性转化具有重要意义.在所探索的各种催化剂中,铜基催化剂具... 由于不断增加的二氧化碳排放导致全球变暖,且能源短缺等问题日益恶化,将二氧化碳电化学还原为高附加值化学品和燃料引起了极大的兴趣,设计高效催化剂对实现二氧化碳的高效选择性转化具有重要意义.在所探索的各种催化剂中,铜基催化剂具有良好的开发潜力,可用于烃类生产.本文综述了铜基电化学二氧化碳转化材料的最新进展.分别从尺寸结构到不同形式(合金、氧化物)的铜基催化剂,以及分子催化剂等方面展开,重点讨论铜基催化剂上二氧化碳电解还原的反应机理.最后,对未来高效铜基催化剂的设计提出展望,以促进二氧化碳转化的可持续发展. 展开更多
关键词 二氧化碳转化 铜基材料 电催化剂 选择性 反应机理
Mo2C@C纳米棒的制备及氧还原性能研究 预览
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作者 刁金香 邱雨 郭晓辉 《人工晶体学报》 EI CAS 北大核心 2019年第8期1544-1548,共5页
碳化钼(Mo2C)已在许多催化反应中被证明具有类Pt金属的特性,在取代贵金属基电催化剂方面具有很好的应用前景。但是,由于催化剂稳定性差,催化性能不能达到工业标准。在此,MoO3-EDA前躯体作模板,丹宁酸(TA)作为碳源,原位合成路线以获得作... 碳化钼(Mo2C)已在许多催化反应中被证明具有类Pt金属的特性,在取代贵金属基电催化剂方面具有很好的应用前景。但是,由于催化剂稳定性差,催化性能不能达到工业标准。在此,MoO3-EDA前躯体作模板,丹宁酸(TA)作为碳源,原位合成路线以获得作为氧还原反应催化剂的Mo2C@C纳米棒。有趣的是,SEM和TEM结果显示在Mo2C上覆盖着无定形碳和形成了Mo2C@C纳米棒。另外,与MO2C相比,Mo2C@C纳米棒表现出较高的的氧还原催化活性和的稳定性。 展开更多
关键词 Mo2C@C纳米棒 氧还原反应 电催化剂 稳定性
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Nickel cobalt phosphide with three-dimensional nanostructure as al highly efficient electrocatalyst for hydrogen evolution reaction in both I acidic and alkaline electrolytes
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作者 Bo Ma Zhengchun Yang +1 位作者 Yantao Chen Zhihao Yuan 《纳米研究:英文版》 SCIE EI CAS CSCD 2019年第2期375-380,共6页
Transition metal phosphides (TMPs) are promising candidates for noble metal free electrocatalysts in water splitting applicati ons. In this work, we prese nt the facile syn thesis of nickel cobalt phosphide electrocat... Transition metal phosphides (TMPs) are promising candidates for noble metal free electrocatalysts in water splitting applicati ons. In this work, we prese nt the facile syn thesis of nickel cobalt phosphide electrocatalyst with three-dime nsional nano structure (3D-NiCoP) on the nickel foam, via hydrothermal reaction and phosphorization. The as-prepared electrocatalyst exhibits an excellent activity for hydrogen evolution reaction (HER) in both acidic and alkaline electrolytes, with small overpotentials to drive 10 mA/cm^2 (80 mV for 0.5 M H2SO4, 105 mV for 1 M KOH), small Tafel slopes (37 mV/dec for 0.5 M H2SO4, 79 mV/dec for 1 M KOH), and satisfying durability in long-term electrolysis. 3D-NiCoP also shows a superior HER activity compared to single metal phosphide, such as cobalt phosphide and nickel phosphide. The outstanding performa nee for HER suggests the great pote ntial of 3D-NiCoP as a highly efficient electrocatalyst for water splitting technology. 展开更多
关键词 NICKEL COBALT PHOSPHIDE water splitting hydrogen evolution reaction ELECTROCATALYST
高性能多孔Fe/N共掺杂碳纳米管电催化剂研究 预览
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作者 吴睿 刘雄雄 陈俊松 《电子科技大学学报》 EI CAS CSCD 北大核心 2019年第5期682-689,共8页
开发高性能、低成本的氧还原催化剂是降低燃料电池成本的关键之一。过渡金属-氮-碳材料具有催化活性高、成本低、环境友好等优点,被认为具有广阔的应用前景。该文提出了一种简单的聚多巴胺改性碳纳米管的方法,在碳纳米管(CNTs)表面包覆... 开发高性能、低成本的氧还原催化剂是降低燃料电池成本的关键之一。过渡金属-氮-碳材料具有催化活性高、成本低、环境友好等优点,被认为具有广阔的应用前景。该文提出了一种简单的聚多巴胺改性碳纳米管的方法,在碳纳米管(CNTs)表面包覆聚多巴胺(PDA),通过高温裂解CNTs@PDA和FeCl3复合物制备多孔CNTs@Fe/N/C电催化剂。用TEM、BET、Raman和XPS对制备的催化剂的形貌和组成进行了表征。电化学结果表明,CNTs@40%Fe/N/C催化剂的半波电位高达0.881V,接近于商业化Pt/C催化剂。此外,CNTs@40%Fe/N/C催化剂亦具备优异的抗甲醇干扰性及稳定性,是一种有良好实际应用前景的燃料电池非贵金属氧还原电催化剂。 展开更多
关键词 碳纳米管 电催化剂 Fe/N/C 氧还原反应 聚多巴胺
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基于金属有机框架衍生的Fe-N-C纳米复合材料作为高效的氧还原催化剂 预览
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作者 王倩倩 刘大军 何兴权 《物理化学学报》 SCIE CAS CSCD 北大核心 2019年第7期740-748,共9页
开发用于氧还原反应(ORR)的低成本和高性能的非贵金属催化剂(NPMC)对于燃料电池的商业化至关重要。在这里,我们介绍了一种简单合成的由Fe3C纳米粒子包裹在介孔N掺杂碳(Fe-NC)中的NPMC材料,包括MIL-100(Fe)与葡萄糖和尿素的物理混合,以... 开发用于氧还原反应(ORR)的低成本和高性能的非贵金属催化剂(NPMC)对于燃料电池的商业化至关重要。在这里,我们介绍了一种简单合成的由Fe3C纳米粒子包裹在介孔N掺杂碳(Fe-NC)中的NPMC材料,包括MIL-100(Fe)与葡萄糖和尿素的物理混合,以及随后在惰性气体下的热解。由此获得的Fe-N-C-900(在900℃下制备的材料)表现出优异的电催化活性,高耐久性和对ORR卓越的甲醇耐受性,其催化性能与商业Pt/C在碱性介质中的催化性能相当。Fe-N-C-900在ORR中表现出优异的催化活性和稳定性,这是由于其较大的BET比表面积,较大的孔体积,氮掺杂剂,活性Fe3C纳米粒子以及其中活性官能团之间的协同效应。 展开更多
关键词 电催化剂 氧还原反应 金属有机框架 Fe3C纳米粒子 协同效应
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含金属键的导电硫化物基水裂解电催化剂研究
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作者 张思艺 周明 《分子科学学报:中英文版》 CAS 北大核心 2019年第1期87-89,共3页
电解水作为一种环境友好的制氢方法,愈加受到人们的青睐.近年来,吉林大学无机合成与制备化学国家重点实验室邹晓新课题组在含金属键的导电硫化物基水裂解电催化剂的开发方面开展了富有特色的研究.
关键词 硫化物 水裂解 电催化剂
电解水制氢MoS2催化剂研究与氢能技术展望 预览 被引量:1
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作者 王培灿 雷青 +1 位作者 刘帅 王保国 《化工进展》 EI CAS CSCD 北大核心 2019年第1期278-290,共13页
氢气具有质量轻、热值高、燃烧产物清洁等优点,被认为是理想的能源载体。氢气既能作为燃料电池的燃料,又能作为储能介质调节风能、太阳能发电系统的随机性、间歇性,正在成为未来能源的重要组成部分。为了促进电解水制氢技术与装备发展,... 氢气具有质量轻、热值高、燃烧产物清洁等优点,被认为是理想的能源载体。氢气既能作为燃料电池的燃料,又能作为储能介质调节风能、太阳能发电系统的随机性、间歇性,正在成为未来能源的重要组成部分。为了促进电解水制氢技术与装备发展,研究高效电催化剂十分重要。本文围绕“粉末型”与“自支撑型”电催化剂结构特征,讨论基于二硫化钼(MoS2)的析氢电催化剂的研究现状,阐述了催化活性位点调控策略与提高导电性两条技术途径,并以析氢过电位和塔菲尔曲线斜率为依据,比较不同方法制备的二硫化钼电催化剂的催化活性。表明提高二硫化钼晶相稳定性、调节其电子结构和优化催化电极结构等方法,将进一步提高基于二硫化钼的析氢催化电极性能。 展开更多
关键词 电催化剂 二硫化钼 电解水 制氢
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MOF/CC-derivatives with trace amount of cobalt oxides as efficient electrocatalysts for oxygen reduction reaction
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作者 Rui-Juan Wu Meng Liu +4 位作者 Ye-Wang Peng Shuang Yao Xiang-Wei Guo Ai-Fang Geng Zhi-Ming Zhang 《中国化学快报:英文版》 SCIE CAS CSCD 2019年第5期989-994,共6页
The development of high-efficiency,earth-abundant,and durable oxygen reduction reaction(ORR)electrocatalysts is desirable for commercialization of fuel cells,but remains a great challenge.Herein,we develop a facile an... The development of high-efficiency,earth-abundant,and durable oxygen reduction reaction(ORR)electrocatalysts is desirable for commercialization of fuel cells,but remains a great challenge.Herein,we develop a facile and practical method for preparing efficient ORR electrocatalysts by directly growing metal-organic frameworks(MOFs)Co2(INA)4·DMF(HINA=isonicotinic acid,1)and{[Co2(TPI)(H2O)2(OH)]·DMF}(H3 TPI=5-(4-(tetrazol-5-yl)phenyl)isophthalic acid,2)on the commercial carbon(CC).The resulting MOF/CCs were further pyrolysis to functionalize CC by trace amount of cobalt oxides,resulting in two composites Cal-MOF-1/CC(3)and Cal-MOF-2/CC(4),which can be used as efficient electrocatalysts for ORR with remarkable stability and large diffusion-limited current density,even superior to that of commercial Pt/C catalysts.Detail study reveals that the linking ligands with different structure and nitrogen contents in 1 and 2 smartly influence the types of cobalt oxides.The catalytic activity of Co3O4/CoO/Co co-doped CC in 4 was much enhanced compared to that of CoO-doped CC in 3. 展开更多
关键词 METAL-ORGANIC framework COBALT oxide Oxygen reduction reaction Commercial carbon ELECTROCATALYST
热处理碳纳米管耦合维生素B12作为氧还原反应电催化剂的性能分析 预览
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作者 段广彬 房雅婷 +4 位作者 董凯 姜媛媛 陈传霞 倪朋娟 逯一中 《分析化学》 SCIE EI CAS CSCD 北大核心 2019年第5期719-724,共6页
开发成本低廉、性能优良的阴极氧还原电催化剂,替代昂贵的铂基催化剂,一直是燃料电池研究中的热点和难点,也是实现燃料电池商业化的关键之一。碳纳米材料负载过渡金属大环配位分子作为氧还原催化剂具有成本低、活性较高、导电性能好、... 开发成本低廉、性能优良的阴极氧还原电催化剂,替代昂贵的铂基催化剂,一直是燃料电池研究中的热点和难点,也是实现燃料电池商业化的关键之一。碳纳米材料负载过渡金属大环配位分子作为氧还原催化剂具有成本低、活性较高、导电性能好、稳定性高等优点。本研究利用维生素B12(VB12)中心的Co-Nx环状结构,以VB12作为活性位点的前驱体,以碳纳米管(CNT)为碳载体,通过高温热解制备了CNT-VB12复合材料。对此复合材料的形貌和组成进行了表征,并对其在碱性条件下的氧气还原电催化活性、稳定性及抗干扰性进行了分析。结果表明,CNT-VB12材料表现出高的氧还原反应(ORR)电催化活性。动力学研究结果表明,此复合材料通过几乎完全的4电子转移过程催化氧气还原为水,并且具有优于商业Pt/C的抗甲醇干扰性及稳定性,是一种有良好实际应用前景的燃料电池非贵金属氧还原电催化剂。 展开更多
关键词 碳纳米管 维生素B12 氧还原反应 电催化剂
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调控层状双金属氢氧化物电子结构促进氧析出反应 预览
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作者 黄靓靓 邹雨芹 +1 位作者 陈大伟 王双印 《催化学报》 SCIE EI CAS CSCD 北大核心 2019年第12期1822-1840,共19页
氢气具有能量密度高、无毒、燃烧产物无环境污染等优点,是一种极具应用前景的可再生能源.目前制氢技术主要包括天然气重整制氢、光解水制氢及电解水制氢,其中天然气重整制氢存在纯度低、成本高的缺点,而光解水制氢技术尚不成熟.电解水... 氢气具有能量密度高、无毒、燃烧产物无环境污染等优点,是一种极具应用前景的可再生能源.目前制氢技术主要包括天然气重整制氢、光解水制氢及电解水制氢,其中天然气重整制氢存在纯度低、成本高的缺点,而光解水制氢技术尚不成熟.电解水制氢纯度高、成本低,已成为一种比较常用且成熟的制氢方法.电解水过程是指在电解池中利用电能分解水分子并释放出氢气和氧气的电化学过程,它包含两个半反应,即阳极析氧反应(OER)和阴极析氢反应(HER).在室温下驱动析氢反应与析氧反应的理论电位分别为0与1.23 V.但是,在实际电解过程中需要额外的电位(过电位)去激活和克服原始反应能垒,因此,尽可能的降低电解水的过电位是氢能广泛应用的必要条件.过渡金属化合物,特别是层状双金属氢氧化物(LDHs),由于其独特的二维层状结构和组成元素可灵活调变等特性,被认为是最具发展前景的电催化剂之一.但LDHs较差的电子导电性和较厚的板层结构极大的限制了其作为氧析出电催化剂的大规模应用.本文总结了LDHs作为OER电催化剂的研究进展,重点介绍了不同阳离子、不同阴离子、缺陷工程、各类插层阴离子和表面改性等改变对材料表面电子结构的影响机制.本文首先介绍了电解水析氧反应在不同电解液中的反应机理,讨论了析氧反应在动力学和热力学过程的主要障碍.通过对大量文献的归纳,综述了近年来通过调控LDHs的电子结构增加其活性位点数目、增强活性位点的本征活性,进而提高其OER催化性能的研究成果和最新进展,重点探讨了阳离子调控、阴离子调控、缺陷工程、插层阴离子调控和表面改性等调控方式对LDHs电催化剂OER性能的影响,总结了各种电子结构调控及其对电催化性能的影响.通过分析不同价态阳离子、阴离子对催化活性位点的电子结构影响,不同层间 展开更多
关键词 氧析出反应 层状双金属氢氧化物 阳离子/阴离子调控 缺陷工程 电催化剂 电子 掺杂
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Highly efficient electrocatalysts derived from carbon black supported non-precious metal macrocycle catalysts for oxygen reduction reaction 预览
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作者 Lijie Hou Jianing Guo Zhonghua Xiang 《能源化学:英文版》 SCIE EI CAS CSCD 2019年第1期73-78,共6页
For the sake of accelerating the commercial application of fuel cells, non-noble metal catalysts with high activity and high stability have been widely developed to replace platinum-based catalysts. Here, we report a ... For the sake of accelerating the commercial application of fuel cells, non-noble metal catalysts with high activity and high stability have been widely developed to replace platinum-based catalysts. Here, we report a simple but cost-effective synthetic strategy using iron tetra-amino phthalocyanine(FePC-NH2)and modified carbon black(HCB) to obtain a novel oxygen reduction electrocatalyst(named as FePCNH2/HCB-800) with Fe2O3 wrapped in nitrogen-doped carbon(N-carbon) as active site. The HCB as template can effectively promotes the formation of Fe2O3 active site in the catalysts. Compared to commercial Pt/C catalyst, the Fe PC-NH2/HCB-800 catalyst exhibits high electrocatalytic activity for oxygen reduction reaction(ORR) with onset potential of 0.98 V and half-wave potential with 0.84 V vs. reversible hydrogen electrode(RHE). Meanwhile, the catalyst also shows excellent circulation stability. We believe that this work provides a platform for ORR and is conducive to the commercialization of fuel cells and metal-air batteries. 展开更多
关键词 Oxygen reduction reaction Iron tetra-amino PHTHALOCYANINE Fuel cell ELECTROCATALYST
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Construction of surface lattice oxygen in metallic N-CuCoS197 porous nanowire for wearable Zn-air battery 预览
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作者 Jie Yin Binbin Wei +2 位作者 Yuxuan Li Yefei Li Pinxian Xi 《能源化学:英文版》 SCIE EI CAS CSCD 2019年第7期1-9,共9页
Achieving high activity and stability oxygen evolution reaction(OER) catalysts to optimize the efficiency of metal-air battery, water splitting and other energy conversion devices, remains a formidable challenge.Herei... Achieving high activity and stability oxygen evolution reaction(OER) catalysts to optimize the efficiency of metal-air battery, water splitting and other energy conversion devices, remains a formidable challenge.Herein, we demonstrate the metallic porous nanowires arrays with abundant defects via nitrogen and copper codoped CoS1.97 nanowires(N-CuCoS1.97 NWs). The N-CuCoS1.97 NWs can serve as an excellent OER self-supported electrode with an overpotential of 280 mV(j = 10 m A cm-2) and remarkable long-term stability. The X-ray absorption near-edge structure(XANES) and X-ray photoelectron spectrum(XPS) measurements confirmed the surface lattice oxygen created on the N-CuCoS1.97 NWs during OER. Then, the density function theory(DFT) results evident that lattice oxygen constructed surface of N-CuCoS1.97 NWs has more favorable OER energetic profiles and absorption for reaction intermediate. More importantly,the flexible and wearable Zn-air battery fabricated by the N-CuCoS1.97 NWs shows excellent rechargeable and mechanical stability, which can be used in portable mobile device. 展开更多
关键词 DFT calculation POROUS nanowires ELECTROCATALYST OER Zn-air battery
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Preparation of nitrogen and sulfur co-doped ultrathin graphitic carbon via annealing bagasse lignin as potential electrocatalyst towards oxygen reduction reaction in alkaline and acid media 预览
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作者 Yixing Shen Feng Peng +3 位作者 Yonghai Cao Jianliang Zuo Hongjuan Wang Hao Yu 《能源化学:英文版》 SCIE EI CAS CSCD 2019年第7期33-42,共10页
Renewable lignin used for synthesizing materials has been proven to be highly potential in specific electrochemistry.Here,we report a simple method to synthesize nitrogen and sulfur co-doped carbon nanosheets by using... Renewable lignin used for synthesizing materials has been proven to be highly potential in specific electrochemistry.Here,we report a simple method to synthesize nitrogen and sulfur co-doped carbon nanosheets by using bagasse lignin,denoted as lignin-derived carbon(LC).By adjusting the ratio of nitrogen source and annealing temperature,we obtained the ultrathin graphitic lignin carbon(LC-4-1000)with abundant wrinkles with high surface area of 1208 m2g_1 and large pore volume of 1.40 cm3g_1.In alkaline medium,LC-4-1000 has more positive half-wave potential and nearly current density compared to commercial Pt/C for oxygen reduction reaction(ORR).More importantly,LC-4-1000 also exhibits comparable activity and superior stability for ORR in acid medium due to its high graphitic N ratio and a direct four electron pathway for ORR.This study develops a cost-effective and highly efficient method to prepare biocarbon catalyst for ORR in fuel cells. 展开更多
关键词 ELECTROCATALYST Biocarbon LIGNIN NITROGEN and SULFUR CO-DOPED carbon Oxygen reduction reaction
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Material design at nano and atomic scale for electrocatalytic CO2 reduction 预览
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作者 Fengjiao Yu Penghui Wei +3 位作者 Yang Yang Yuhui Chen Limin Guo Zhangquan Peng 《纳米材料科学(英文版)》 CAS 2019年第1期60-69,共10页
Electrocatalytic CO2 reduction (ECR) into value-added chemicals offers potential solution for renewable energy as well as global carbon footprint concerns. In this review we introduce the general methods and metrics t... Electrocatalytic CO2 reduction (ECR) into value-added chemicals offers potential solution for renewable energy as well as global carbon footprint concerns. In this review we introduce the general methods and metrics that are commonly applied in ECR, followed by a discussion of current reaction mechanisms and different pathways. We highlight how size and structure of electrocatalysts affect ECR performance and review recent advances in metalfree and single-atom catalysts. The challenges of ECR are also discussed and optimistic perspectives are made for future work. 展开更多
关键词 CO2 ELECTROREDUCTION Material design ELECTROCATALYST Cell CONFIGURATION
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High electrocatalytic hydrogen evolution activity on a coupled Ru and CoO hybrid electrocatalyst 预览
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作者 Jia-Xin Guo Dong-Yang Yan +5 位作者 Kang-Wen Qiu Chuan Mu Dian Jiao Jing Mao Hui Wang Tao Ling 《能源化学:英文版》 CSCD 2019年第10期143-147,共5页
Hydrogen evolution reaction (HER) is an essential step in converting renewable energy to clean hydrogen fuel. Exploring highly efficient, stable and cost-effective electrocatalysts is of crucial significance for susta... Hydrogen evolution reaction (HER) is an essential step in converting renewable energy to clean hydrogen fuel. Exploring highly efficient, stable and cost-effective electrocatalysts is of crucial significance for sustainable HER. Here, we report the design of a coupled ruthenium/cobalt oxide (Ru/CoO) hybrid electrocatalyst for alkaline HER. In this hybrid metal/oxide system, the complicated alkaline HER pathways are overall facilitated;oxygen (O)-vacancy-abundant oxide enhances water splitting and Ru promotes successive hydrogen intermediates to generate hydrogen. The resulting Ru/CoO hybrid electrocatalyst exhibits significantly promoted catalytic activity compared with benchmark Ru catalyst, displaying an overpotential of 55 mV to generate a HER current density of 10 mA cm^-2, comparable with the state-of-the-art Pt/C catalyst and the most efficient alkaline HER electrocatalysts. Furthermore, the strong interaction of Ru nanoparticles with oxide support and the in-situ growth of oxide support on conductive substrate guarantee the long-term stability of as-fabricated Ru/CoO hybrid electrocatalyst. This newly designed hybrid catalyst with abundant metal/oxide interfaces may pave a new pathway for exploring efficient and stable HER electrocatalysts. 展开更多
关键词 RUTHENIUM OXIDES HYBRID ELECTROCATALYST Hydrogen evolution reaction
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质子交换膜燃料电池的研究进展 预览
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作者 何祖杨 陈秋兴 +2 位作者 张文涛 杨通 许勤芳 《广州航海学院学报》 2019年第3期62-65,共4页
文章介绍了质子交换膜燃料电池(PEMFC)的工作原理,综述了PEMFC的关键材料质子交换膜和电催化剂的国内外研究现状,指出了当前研究中存在的问题,提出了今后质子交换膜和电催化剂的发展方向.
关键词 燃料电池 质子交换膜 电催化剂
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形貌可控的铂类贵金属氧还原电催化剂研究进展 预览
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作者 郝佳瑜 刘易斯 +1 位作者 李文章 李洁 《材料导报》 EI CAS CSCD 北大核心 2019年第1期127-134,共8页
金属-空气电池是一类以金属燃料作为负极活性物质,空气中的氧气作为正极活性物质,正负极活性物质反应产生的化学能通过电化学反应而非燃烧反应转化成电能的环境友好型燃料电池。金属-空气电池的成功运行往往依赖于高效的空气电极,氧还... 金属-空气电池是一类以金属燃料作为负极活性物质,空气中的氧气作为正极活性物质,正负极活性物质反应产生的化学能通过电化学反应而非燃烧反应转化成电能的环境友好型燃料电池。金属-空气电池的成功运行往往依赖于高效的空气电极,氧还原过程作为空气电极的主反应,还原过程中产生的高过电位严重制约着金属-空气电池的大规模应用。目前金属-空气电池阴极普遍使用昂贵的Pt/C氧还原催化剂材料来降低氧还原过程的高过电位,最大程度地减少电池电压以及输出功率的损失。氧还原催化剂材料的研究重点是寻找更高效、廉价的催化剂。目前常见的氧还原催化剂主要包含铂类贵金属、过渡金属氧化物和硫化物以及碳基非金属复合材料,其中铂类贵金属型氧还原催化剂凭借其优异的氧还原催化性能得到广泛关注。随着化学合成手段的不断发展,越来越多的异质结构铂类贵金属型氧还原催化剂被合成,基于各组分之间独特的协同作用,其往往表现出优于单一组分的催化性能,近几年对铂类贵金属型氧还原催化剂的研究主要集中在以下两个方面:(1)探究铂类贵金属催化剂表面元素组成及原子排布与其催化活性之间的关系,例如,研究纯铂纳米晶的晶面指数与其氧还原催化性能之间的关系;(2)设计特殊结构的铂类催化剂来达到优化氧还原催化剂催化活性和降低材料生产成本的目的,例如,在廉价核材料上通过异质外延生长的方式沉积铂壳层,可大大提升铂原子的催化效率。本文归纳了形貌可控的铂类贵金属氧还原催化剂的研究进展,分别对规则多面体型纯铂及铂类合金纳米晶,特殊结构铂类合金纳米晶氧还原催化剂进行了详细介绍。此外,为了更好地理解氧还原的催化机制,本文就氧还原过程的动力学与热力学原理进行了简单总结。由于铂类贵金属氧还原催 展开更多
关键词 铂纳米晶 贵金属类合金 形貌控制 氧还原反应 电催化剂
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