Platinum-free electrocatalysts for hydrogen oxidation reaction in alkaline media
Platinum-free electrocatalysts for hydrogen oxidation reaction in alkaline media
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用于碱性介质中氢氧化反应的无铂电催化剂
DOI：
10.1016/j.nanoen.2022.107877
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发表时间：
2022-10
期刊：
影响因子：
17.6
通讯作者：
Wei Xing
中科院分区：
文献类型：
--
作者：
Xiaoning Wang;Xuejin Li;Dongqing Kong;Lianming Zhao;Yongpeng Cui;Yesheng Wang;Tonghui Cai;Qingzhong Xue;Zifeng Yan;Wei Xing
由于使用经济催化剂的优点，更新的阴离子交换膜燃料电池(AEMFC)有望最大限度地减少燃料电池的成本限制。然而，碱性介质中氢氧化反应(HOR)动力学缓慢导致的高铂用量(几乎是酸中的10倍)阻碍了AEMFC的发展。开发替代的无铂电催化剂是可取的，但由于缺乏对机理的了解和全系统的设计指导而受到限制。在此背景下，本文从碱性高放反应机理、氢/羟基结合能理论以及碱中低高放动力学的理论解释入手，对碱性高放反应机理进行了综述。其次，综述了无铂HOR催化剂载体、助催化剂和活性组份的研究进展。首次系统介绍了载体和助催化剂与活性金属的协同作用机理。最后，对碱性重油无铂电催化剂存在的挑战和未来的发展方向进行了展望。
The renewed anion exchange membrane fuel cells (AEMFCs) are expected to minimize the cost constraints of fuel cells owing to the advantages of employing economic catalysts. However, high Pt dosage (almost ten times higher than that in acids) caused by the sluggish hydrogen oxidation reaction (HOR) kinetics in alkaline media hampers the development of AEMFCs. Developing alternative Pt-free electrocatalysts is desirable but is limited by the lack of mechanistic understanding and system-wide design guidance. Against this backdrop, this review starts with the alkaline HOR mechanisms about reaction pathways, hydrogen/hydroxyl binding energy theory, and theoretical interpretations on the low HOR kinetics in alkali. Next, recent advances in developing supports, cocatalysts, and active components for Pt-free HOR catalysts are summarized. The synergistic mechanism of supports and cocatalysts with active metals is for the first time systematically introduced. Finally, a brief perspective on the remaining challenges and future directions of Pt-free electrocatalysts for alkaline HOR is also outlined.
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