析氧
多金属氧酸盐
电催化剂
复合数
催化作用
化学工程
材料科学
氧气
化学
氧还原反应
电化学
复合材料
电极
有机化学
物理化学
工程类
作者
Ruihao Gong,Dandan Gao,Rongji Liu,Dieter Sorsche,Johannes Biskupek,Ute Kaiser,Sven Rau,Carsten Streb
出处
期刊:ACS applied energy materials
[American Chemical Society]
日期:2021-10-15
卷期号:4 (11): 12671-12676
被引量:30
标识
DOI:10.1021/acsaem.1c02399
摘要
The electrocatalytic oxygen evolution reaction (OER) is a key step to access "green hydrogen" by splitting water into O2 and H2. Here, we present a molecule-in-material integration concept based on immobilizing the polyoxometalate (POM) anion ([Co4(H2O)2(PW9O34)2]10–) as a molecular precursor on commercial TiO2 (P25) nanoparticles using the cationic polymer polyethylenimine (PEI) as a linking agent. The resulting composite shows promising electrocatalytic OER performance in 0.1 M aqueous KOH solution over prolonged periods (>10 h), during which a remarkable self-activation is observed, leading to a decreased OER overpotential, increased current density, and high Faradaic efficiency (91 ± 1%). Mechanistic studies shed light on the underlying reasons for this self-activation and show that the formation of a highly active cobalt oxide and/or hydroxide catalyst and an increase in the electrocatalytically active surface area as well as electrical conductivity are the main contributing factors. The reported approach enables the scalable fabrication of POM-derived composite electrocatalysts, while self-activation could be a viable route to the more robust and more active electrocatalysts for challenging energy-conversion reactions.
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