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首页> 外文期刊>Journal of Materials Chemistry, A. Materials for energy and sustainability >Nanostructured robust cobalt metal alloy based anode electro-catalysts exhibiting remarkably high performance and durability for proton exchange membrane fuel cells
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Nanostructured robust cobalt metal alloy based anode electro-catalysts exhibiting remarkably high performance and durability for proton exchange membrane fuel cells

机译：纳米结构坚固的钴金属合金基阳极电催化剂对质子交换膜燃料电池表现出显着的高性能和耐久性

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摘要

In recent years, the development of durable and electrochemically active electro-catalyst alloys with reduced noble metal content exhibiting similar or better electrochemical performance than pure noble metal electrocatalysts has gathered considerablemomentumparticularly, for proton exchange membrane fuel cell (PEMFC) application. Engineering such reduced noble metal containing electro-catalyst alloys in nano-scale dimensions with highly active electrochemical surface area (ECSA) will ultimately translate to reduced noble metal loadings to ultra-low levels which will eventually lead to an overall reduction in the capital cost of PEMFCs. Herein we report the development of nanostructured Co-Ir based solid-solution electro-catalyst alloys for the hydrogen oxidation reaction (HOR) further validated by first principles theoretical calculation of the d band center of the transition metal in the solid solution alloys. The theoretical and experimental studies reported herein demonstrate that the nanostructured alloy electro-catalysts comprising 70 at% Co (Co0.7Ir0.3) and 60 at% Co (Co0.6Ir0.4) of crystallite size similar to 4 nm with a high electrochemically active surface area (ECSA) (similar to 56 m(2) g(-1)) exhibit improved electrochemical activity (reduction in overpotential and improved reaction kinetics) for the HOR combined with outstanding durability in contrast to pure Ir nanoparticles (Ir-NPs) as well as state of the art commercial Pt/C system. Moreover, an optimized alloy containing 60 at% Co (Co0.6Ir0.4) showed a remarkable similar to 156% and 92% higher electro-catalytic activity for the HOR than Ir-NPs and commercial 40% Pt/C, respectively, with similar loading and ECSA. The single PEMFC full cell study also shows similar to 85% improved maximum power density for the Co-0.6(Ir-0.4) electrocatalyst compared to 40% Pt/C and excellent electrochemical stability/durability comparable to 40% Pt/C.
机译：近年来，具有降低的贵金属含量表现出与纯贵金属电催化剂相似或更好的电化学性能的耐用且具有电化学活性的电催化剂合金的发展尤其是在质子交换膜燃料电池（PEMFC）应用方面获得了相当大的发展。以纳米级尺寸对具有高活性电化学表面积（ECSA）的此类还原的含贵金属的电催化剂合金进行工程设计，最终将使贵金属的负载量降低至超低水平，从而最终导致整体投资成本的降低。 PEMFC。在本文中，我们报告了用于氢氧化反应（HOR）的纳米结构基于Co-Ir的固溶体电催化剂合金的开发，该固溶体电催化剂合金已通过固溶合金中过渡金属d带中心的第一原理理论计算得到了进一步验证。本文报道的理论和实验研究表明，纳米结构的合金电催化剂包含70at％Co（Co0.7Ir0.3）和60 at％Co（Co0.6Ir0.4）的微晶尺寸类似于4 nm的高电化学与纯Ir纳米粒子（Ir-NPs）相比，活性表面积（ECSA）（类似于56 m（2）g（-1））对HOR表现出改善的电化学活性（减少过电位和改善的反应动力学），并具有出色的耐久性）以及最先进的商用Pt / C系统。而且，含有60at％Co（Co0.6Ir0.4）的优化合金对HOR的电催化活性分别比Ir-NPs和市售40％Pt / C分别高出156％和92％。与ECSA相似。单个PEMFC全电池研究还表明，与40％Pt / C相比，Co-0.6（Ir-0.4）电催化剂的最大功率密度提高了约85％，而电化学稳定性/耐久性与40％Pt / C相当。

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