过电位
X射线光电子能谱
双功能
析氧
催化作用
过渡金属
无机化学
电催化剂
化学
氧化物
碱土金属
金属
电化学
材料科学
物理化学
化学工程
电极
工程类
生物化学
有机化学
作者
Arcokiam John Jeevagan,Yukiko Suzuki,Takao Gunji,Govindachetty Saravanan,Yuta Irii,Takashi Tsuda,Toshiaki Onobuchi,Shingo Kaneko,Genki Kobayashi,Futoshi Matsumoto
出处
期刊:ECS transactions
[The Electrochemical Society]
日期:2014-02-27
卷期号:58 (20): 9-18
被引量:11
标识
DOI:10.1149/05820.0009ecst
摘要
We have synthesized metal oxides (MnO 2 , RuO 2 , IrO 2 , and transition metal (Ru, Ir and Ni) ion-doped metal oxides) using a precipitation method and exhaustively examined their bifunctional electrocatalytic activities for the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) in alkaline solutions. X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) measurements were used to study the structure and electronic states of the catalysts. The XRD and XPS data confirmed the successive modification of the structure and electronic states on the catalyst surface by doping transition metal ions into MnO 2 , RuO 2 and IrO 2 . The samples showed stable performance in terms of their overpotential. The MnO 2 -based metal oxide exhibited a relatively lower overpotential for ORR. Mn 1-n Ru n O x , Ru 1-n Ni n O x , and Ru 1-n Ir n O x were identified as preferable catalysts for OER. From the samples examined in this study, Mn 1-n Ru n O x (n = 0.1, 0.2, 0.8) and Ru 0.9 Ni 0.1 O x showed promise as bifunctional catalysts.
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