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作 者:王乐萍 沈奇欣 田林 杨妮 谢刚 李冰[1] Wang Leping;Shen Qixin;Tian Lin;Yang Ni;Xie Gang;Li Bing(School of Materials Science and Engineering,East China University of Science and Technology,Shanghai 200237,China;State Key Laboratory of Common Associated Nonferrous Metal Resources Pressure Hydrometallurgy Technology,Kunming 650503,China)
机构地区:[1]华东理工大学机械与动力工程学院,上海200237 [2]云南冶金集团共伴生有色金属资源加压湿法冶金技术国家重点实验室,云南昆明650503
出 处:《稀有金属》2019年第4期367-374,共8页Chinese Journal of Rare Metals
基 金:国家自然科学基金项目(51774145);云南冶金集团共伴生有色金属资源加压湿法冶金技术国家重点实验室开放基金项目(yy2016008)资助
摘 要:采用CoCl_2-EMIC离子液体,在碳纸电极上无模板电沉积得到Co纳米线,然后通过K_2PtCl_4溶液和抗坏血酸进行置换反应制备PtCo复合纳米线,后续热处理得到PtCo-700℃合金纳米线。PtCo复合纳米线中Pt以互相连接的片层结构较好包裹在Co纳米线的表面, Co/Pt摩尔比为12。电化学研究表明:PtCo的电化学活性表面积(ECSA)高达65.1 m^2·g^(-1),比商用JM-Pt/C催化剂高6.9 m^2·g^(-1), PtCo-700℃的ECSA仅为34.7 m^2·g^(-1)。当电位在0.85 V时, PtCo-700℃的质量比和面积比活性均最高,分别是JM-Pt/C催化剂的9.5倍和15倍。500圈加速老化实验后, 0.85 V时, PtCo-700℃的质量比和面积比活性仍最高,分别是JM-Pt/C催化剂的8.7倍和10.3倍。PtCo复合纳米线有效地提高了催化剂的活性,合金化后的PtCo-700℃呈现出更优异的催化性能。此外负载铂钴复合纳米线的碳纸可以直接组装进燃料电池,简化了燃料电池的制备过程。Co nanowires were electrodeposited from CoCl2 -EMIC ionic liquid on carbon paper without template.Preparing PtCo composite nanowires through the displacement reaction by immersing the carbon paper with Co nanowires into the K2 PtCl4 solution and ascorbic acid.With the subsequent heat treatment,PtCo-700 ℃ alloy nanowires were prepared.PtCo composite nanowires have shown interconnected sheet structure of Pt layer perfectly coated on the surface of Co nanowires and the Co/Pt molar ratio is 12.Electrochemical results showed that the electrochemical surface area (ECSA) of PtCo composite nanowires was 65.1 m^2·g^-1,which was 6.9 m^2·g^-1 higher than that of the commercial JM-Pt/C catalyst,while that of the PtCo-700 ℃ was only 34.7 m^2·g^-1.At 0.85 V,the mass activities and the specific activities of PtCo-700 ℃ were the highest,9.5 times and 15.0 times that of JM-Pt/C catalyst respectively.After 500 cycles,at 0.85 V,the mass activities and the specific activities of PtCo-700 ℃ were still the highest.The prepared PtCo composite nanowires effectively improved the activity of the catalyst,and PtCo alloy nanowires showed the higher activity.And the carbon paper supporting the platinum-cobalt composite nanowires could be directly assembled into a fuel cell,thereby simplifying the preparation process of the fuel cell.
分 类 号:TM911[电气工程—电力电子与电力传动]
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