析氧
焦绿石
材料科学
无机化学
催化作用
质子交换膜燃料电池
阳极
氧气
分解水
电解
价(化学)
化学工程
氧化钌
钌
电化学
化学
电解质
电极
物理化学
工程类
光催化
生物化学
有机化学
相(物质)
作者
Qi Feng,Jiexin Zou,Yajun Wang,Zhongxing Zhao,Mark C. Williams,Hui Li,Haijiang Wang
标识
DOI:10.1021/acsami.9b19352
摘要
Proton exchange membrane (PEM) water electrolysis is a promising energy storage solution by electrochemically splitting water into hydrogen fuel and oxygen. However, the sluggish kinetics, high operating potential, and corrosive acidic environment during the oxygen evolution reaction (OER) require the use of scarce and costly Ir-based oxides, tremendously hampering its large-scale commercialization. Hence, developing active and stable anode catalysts with reduced precious-metal usage is desperately essential. For the first time, we report a group of Y2-xBaxRu2O7 pyrochlore oxides and employ them in acid OER and PEM electrolyzers. We reveal the mechanism for the promoted OER performance of Ba-doped Y2Ru2O7 in which partially replacing Y3+ by Ba2+ in Y2Ru2O7 greatly facilitates the hole-doping effect, which generates massive oxygen vacancy and multivalence of Ru5+/Ru4+, thus boosting the OER performance of Y2-xBaxRu2O7. This work provides an effective method and paradigm for improving the electrocatalytic property of pyrochlore oxides.
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