Nanoscale Design of Pd‐Based Electrocatalysts for Oxygen Reduction Reaction Enhancement in Alkaline Media
Nanoscale Design of Pd‐Based Electrocatalysts for Oxygen Reduction Reaction Enhancement in Alkaline Media
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DOI：
10.1002/sstr.202100188
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发表时间：
2021-12
期刊：
影响因子：
15.9
通讯作者：
Ming Zhou;Jiangna Guo;Jiye Fang
中科院分区：
文献类型：
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作者：
Ming Zhou;Jiangna Guo;Jiye Fang
钯（Pd）基电催化剂最近已成为碱性介质中氧还原反应（ORR）的一类最有前途的候选者，这是由于其优异的ORR活性和耐久性以及与铂相比更低的成本。具有优化的活性表面位点和最大内在性能的Pd基纳米结构的深入设计是促进ORR应用的核心。为了进一步加速燃料电池阴极处的缓慢ORR动力学并显著降低电催化剂的总成本，在过去十年中已经广泛开发了各种策略，包括具有选定晶面的受控尺寸和形状、晶相工程、杂原子掺杂、定制表面应变和通过去合金化的表面工程。本文简要介绍了碱性介质中Pd基电催化剂的基本ORR机理，并结合实例详细讨论了高性能Pd基催化剂的精细设计策略。在此基础上，对这些挑战提出了展望和新的见解，并提出了与Pd基ORR电催化剂的合理设计和可控合成相关的一些新兴研究方向。
Palladium (Pd)‐based electrocatalysts have recently emerged as one class of the foremost promising candidates for the oxygen reduction reaction (ORR) in alkaline media due to their excellent ORR activity and durability and lower costs compared with platinum. Insightful design of Pd‐based nano‐architectures with optimized active surface sites and maximal intrinsic performance is central to promoting the ORR applications. To further accelerate the sluggish ORR kinetics at the cathode of fuel cells and substantially decrease the overall cost of the electrocatalysts, various strategies, including controlled sizes and shapes with selected crystallographic facets, crystal‐phase engineering, heteroatom doping, tailored surface strains, and surface engineering by de‐alloying, have been extensively developed in the past decade. In this review, a brief introduction to the fundamental ORR mechanisms of Pd‐based electrocatalysts in alkaline media is presented, followed by a thorough discussion on various strategies for delicately designing high‐performance Pd‐based catalysts with corresponding examples. Thereafter, the perspectives and new insights into the challenges are outlined, and some emerging research directions related to the rational design and controlled synthesis of Pd‐based ORR electrocatalysts are also proposed.