Electrodeposition of palladium-dotted nickel nanowire networks as a robust self-supported methanol electrooxidation catalyst
Electrodeposition of palladium-dotted nickel nanowire networks as a robust self-supported methanol electrooxidation catalyst
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DOI：
10.1007/s10853-021-06088-6
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发表时间：
2021-04
影响因子：
4.5
通讯作者：
Tim Boettcher;S. Stojkovikj;P. Khadke;U. Kunz;M. Mayer;C. Roth;W. Ensinger;F. Muench
中科院分区：
文献类型：
--
作者：
Tim Boettcher;S. Stojkovikj;P. Khadke;U. Kunz;M. Mayer;C. Roth;W. Ensinger;F. Muench
摘要质量活性和长期稳定性是当前燃料电池催化剂设计中的两个主要问题。负载型催化剂的长期稳定性较差，但具有较高的质量活性，而非负载型催化剂在第一点上表现较好，在后一点上表现不足。在本研究中，概述了一种简便的合成路线，以实现自支撑金属电催化剂纳米结构，同时考虑到这两个方面。该过程包括离子轨迹蚀刻聚合物模板的钯播种步骤，然后是镍电沉积和模板溶解。利用这种策略，可以获得仅在外表面含有钯纳米粒子的独立镍纳米线网络。这些网络在阳极半电池测量中进行了测试，以证明它们在碱性电解质中氧化甲醇的能力。电化学实验结果表明，这种新型催化剂比商业碳负载的钯纳米颗粒催化剂更能耐受高浓度甲醇（高达），并在电位循环过程中提供更好的长期稳定性。图形抽象
AbstractMass activity and long-term stability are two major issues in current fuel cell catalyst designs. While supported catalysts normally suffer from poor long-term stability but show high mass activity, unsupported catalysts tend to perform better in the first point while showing deficits in the latter one. In this study, a facile synthesis route towards self-supported metallic electrocatalyst nanoarchitectures with both aspects in mind is outlined. This procedure consists of a palladium seeding step of ion track-etched polymer templates followed by a nickel electrodeposition and template dissolution. With this strategy, free-standing nickel nanowire networks which contain palladium nanoparticles only in their outer surface are obtained. These networks are tested in anodic half-cell measurements for demonstrating their capability of oxidising methanol in alkaline electrolytes. The results from the electrochemical experiments show that this new catalyst is more tolerant towards high methanol concentrations (up to) than a commercial carbon supported palladium nanoparticle catalyst and provides a much better long-term stability during potential cycling.Graphical Abstract