催化作用
过电位
析氧
氧化钌
电解质
氧化物
锶
无机化学
铱
电化学
浸出(土壤学)
电化学能量转换
钌
化学工程
电催化剂
化学
材料科学
物理化学
电极
冶金
有机化学
土壤水分
土壤科学
工程类
生物化学
环境科学
作者
Linsey C. Seitz,Colin F. Dickens,Kazunori Nishio,Yasuyuki Hikita,Joseph H. Montoya,Andrew D. Doyle,Charlotte Kirk,Aleksandra Vojvodić,Harold Y. Hwang,Jens K. Nørskov,Thomas F. Jaramillo
出处
期刊:Science
[American Association for the Advancement of Science (AAAS)]
日期:2016-09-01
卷期号:353 (6303): 1011-1014
被引量:1732
标识
DOI:10.1126/science.aaf5050
摘要
Oxygen electrochemistry plays a key role in renewable energy technologies such as fuel cells and electrolyzers, but the slow kinetics of the oxygen evolution reaction (OER) limit the performance and commercialization of such devices. Here we report an iridium oxide/strontium iridium oxide (IrO x /SrIrO 3 ) catalyst formed during electrochemical testing by strontium leaching from surface layers of thin films of SrIrO 3 . This catalyst has demonstrated specific activity at 10 milliamps per square centimeter of oxide catalyst (OER current normalized to catalyst surface area), with only 270 to 290 millivolts of overpotential for 30 hours of continuous testing in acidic electrolyte. Density functional theory calculations suggest the formation of highly active surface layers during strontium leaching with IrO 3 or anatase IrO 2 motifs. The IrO x /SrIrO 3 catalyst outperforms known IrO x and ruthenium oxide (RuO x ) systems, the only other OER catalysts that have reasonable activity in acidic electrolyte.
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