Unsupported Pt-Ni Aerogels with Enhanced High Current Performance and Durability in Fuel Cell Cathodes,Angewandte Chemie International Edition

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Unsupported Pt-Ni Aerogels with Enhanced High Current Performance and Durability in Fuel Cell Cathodes
Angewandte Chemie International Edition ( IF 16.1 ) Pub Date : 2017-07-18 02:27:41 , DOI: 10.1002/anie.201704253
Sebastian Henning ₁ , Hiroshi Ishikawa ₂ , Laura Kühn ₃ , Juan Herranz ₁ , Elisabeth Müller ₄ , Alexander Eychmüller ₃ , Thomas J. Schmidt _{1,

5}

Affiliation

Highly active and durable oxygen reduction catalysts are needed to reduce the costs and enhance the service life of polymer electrolyte fuel cells (PEFCs). This can be accomplished by alloying Pt with a transition metal (for example Ni) and by eliminating the corrodible, carbon-based catalyst support. However, materials combining both approaches have seldom been implemented in PEFC cathodes. In this work, an unsupported Pt-Ni alloy nanochain ensemble (aerogel) demonstrates high current PEFC performance commensurate with that of a carbon-supported benchmark (Pt/C) following optimization of the aerogel's catalyst layer (CL) structure. The latter is accomplished using a soluble filler to shift the CL's pore size distribution towards larger pores which improves reactant and product transport. Chiefly, the optimized PEFC aerogel cathodes display a circa 2.5-fold larger surface-specific ORR activity than Pt/C and maintain 90 % of the initial activity after an accelerated stress test (vs. 40 % for Pt/C).

中文翻译：

不受支持的Pt-Ni气凝胶，在燃料电池阴极中具有增强的高电流性能和耐用性

需要高活性和耐用的氧还原催化剂以降低成本并提高聚合物电解质燃料电池（PEFC）的使用寿命。这可以通过将Pt与过渡金属（例如Ni）合金化并消除可腐蚀的碳基催化剂载体来实现。但是，很少在PEFC阴极中实现将两种方法结合起来的材料。在这项工作中，通过优化气凝胶的催化剂层（CL）结构，无载体的Pt-Ni合金纳米链整体（气凝胶）表现出与碳载基准（Pt / C）相称的高电流PEFC性能。后者是通过使用可溶性填料将CL的孔径分布移向较大的孔来完成的，从而改善了反应物和产物的传输。主要，

更新日期：2017-07-19

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