Modulation of iridium-based catalyst by a trace of transition metals for hydrogen oxidation/evolution reaction in alkaline
Modulation of iridium-based catalyst by a trace of transition metals for hydrogen oxidation/evolution reaction in alkaline
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微量过渡金属对铱基催化剂的调节用于碱性条件下的氢氧化/析氢反应
DOI：
10.1016/j.electacta.2019.135444
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发表时间：
2020
影响因子：
6.6
通讯作者：
Wei Zidong
中科院分区：
文献类型：
--
作者：
Jiang Jinxia;Liao Jianhua;Tao Sicheng;Najam Tayyaba;Ding Wei;Wang Haijiang;Wei Zidong
我们报告说，铱合金纳米晶表面的微量金属杂质对氢氧化反应（HOR）和析氢反应（HER）的电催化活性有很大影响。发现HOR/HER活性主要与OH吸附有关，OH吸附与表面杂质含量有关。此外，发现Ir表面上的外来金属物种可以有效地增强或抑制HOR活性，这取决于它们的亲氧性。结果表明，Ir基催化剂的HOR/HER活性与OH吸附强度呈火山型关系，且Ir基催化剂表面的微量Fe物种或中等亲氧性的Ru原子能带来适度的OH吸附，从而提高催化剂的HOR/HER活性。
We report that trace level of metal impurities on the surface of Ir alloy nanocrystals show a great impact on the electrocatalytic activity for the hydrogen oxidation reaction (HOR) and hydrogen evolution reaction (HER). The HOR/HER activities were found to be predominantly related to OH adsorption that is related to the surface impurity content. Further, it was found that the foreign metal species on Ir surface could effectively enhance or depress HOR activity depending on their oxophilicity. We found that there is a volcano-shaped dependence of HOR/HER activity on the OH adsorption strength; and trace Fe species or moderate oxophilic Ru atoms on the surface of Ir based catalyst bring the modest OH adsorption and lead to enhanced HOR/HER activity.