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双功能氧催化剂Sr1-xSmxCoO3(x=0~0.6)的电催化行为研究 预览

Electrocatalytic behaviors of bifunctional oxygen catalyst Sr 1- xSmxCoO3 (x=0-0.6)
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摘要 近年来,可逆燃料电池因其高效环保而备受关注,然而其进一步发展受到双功能氧催化剂的严重制约。作为一种极具开发前景的双功能氧催化剂,钴基钙钛矿成为该领域的研究热点。然而,其氧催化活性和稳定性尚需进一步改善。采用改性溶胶-凝胶工艺制备了Sr1-xSmxCoO3(SSC,x=0~0.6)系列氧催化剂,并对其氧催化活性与稳定性进行了研究。结果表明,Sm掺杂能有效改善SrCoO3体系的双功能氧催化活性。其中,Sr0.7Sm0.3-CoO3(SSC-30)具有最高的氧还原催化活性,其起始电位和半波电位可达0.798V和0.638V(vsRHE)。Sr0.8-Sm0.2CoO3(SSC-20)具有最高的氧析出催化活性,其在10mA/cm^2电流密度下的电位值可达1.692V,对应的过电位η为462mV。综合氧还原和氧析出催化活性的测试结果,SSC-30具有最佳的双功能氧催化活性,OER和ORR的电位差ΔE仅为1.071V。此外,Sm掺杂还能进一步提高SrCoO3的氧催化稳定性,其中SSC-30对氧还原与析出的催化稳定性均高于SrCoO3。研究结果有望为双功能钴基钙钛矿的开发和应用提供理论指导。 In recent years,reversible fuel cells (RFCs) have attracted much attention due to their high efficiency and environmental friendliness. However,the further development of RFCs is severely hindered by bifunctional oxygen catalysts. As a promising bifunctional oxygen catalyst,cobalt-based perovskites become a research hotspot in this field. However,its oxygen catalytic activity and stability still need to be further improved. In this paper,a series of Sr 1- x Sm x CoO 3 (SSC,x =0-0.6) oxygen catalysts were prepared by a modified sol-gel method and their oxygen catalytic activity and stability were studied. The results showed that samarium ion doping could effectively improve the bifunctional oxygen catalytic activities of SrCoO 3 perovskite. Among them,Sr 0.7 Sm 0.3 CoO 3 (SSC-30) had the highest oxygen reduction reaction (ORR) catalytic activity,and its onset potential and half-wave potential could reach 0.798 V and 0.638 V(vs RHE). Sr 0.8 Sm 0.2 CoO 3 (SSC-20) had the highest oxygen evolution reaction (OER) catalytic activity and its potential and corresponding overpotential η could respectively reach 1.692 V and 462 mV at a current density of 10 mA/cm ^2. Based on the results of ORR and OER catalytic activities,SSC-30 had the best bifunctional oxygen catalytic activity and the potential difference Δ E between OER and ORR was only 1.071 V. In addition,Sm-doping could further improve the oxygen catalytic stability of SrCoO 3,and its catalytic stability toward ORR and OER of SSC-30 was much higher than that of SrCoO 3. The results of this paper can give guidance for the development and application of bifunctional cobalt-based perovskites.
作者 王洲航 苗鹤 林佩俭 陈斌 武旭扬 李庆峰 袁金良 WANG Zhouhang;MIAO He;LIN Peijian;CHEN Bin;WU Xuyang;LI Qingfeng;YUAN Jinliang(Faculty of Maritime and Transportation,Ningbo University,Ningbo 315211,China)
出处 《功能材料》 EI CAS CSCD 北大核心 2019年第5期5006-5011,5017共7页 Journal of Functional Materials
基金 国家自然科学基金资助项目(91634102,51871126) 宁波市自然科学基金资助项目(2018A610018).
关键词 可逆燃料电池 阴极 氧还原/氧析出催化剂 钴基钙钛矿 reversible fuel cells cathodes oxygen reduction/evolution catalyst cobalt-based perovskites
作者简介 王洲航(1993-),男,辽宁鞍山人,硕士,主要从事燃料电池阴极催化剂研究;通讯作者:袁金良,E-mail:yuanjinliang@nbu.edu.cn.
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