过电位
析氧
催化作用
电解水
分解水
电解
阳极
电子转移
电催化剂
化学
材料科学
化学工程
纳米技术
无机化学
电化学
电极
物理化学
光催化
工程类
生物化学
电解质
作者
Jia Wang,Xuejie Cao,Xiaojie Chen,Hongye Qin,Licheng Miao,Qing‐Lun Wang,Lifang Jiao
出处
期刊:Small
[Wiley]
日期:2024-04-10
标识
DOI:10.1002/smll.202310464
摘要
Abstract Developing highly active and durable catalysts in acid conditions remains an urgent issue due to the sluggish kinetics of oxygen evolution reaction (OER). Although RuO 2 has been a state‐of‐the‐art commercial catalyst for OER, it encounters poor stability and high cost. In this study, the electronic reservoir regulation strategy is proposed to promote the performance of acidic water oxidation via constructing a RuO 2 /MnO 2 heterostructure supported on carbon cloth (CC) (abbreviated as RuO 2 /MnO 2 /CC). Theoretical and experimental results reveal that MnO 2 acts as an electron reservoir for RuO 2 . It facilitates electron transfer from RuO 2 , enhancing its activity prior to OER, and donates electrons to RuO 2 , improving its stability after OER. Consequently, RuO 2 /MnO 2 /CC exhibits better performance compared to commercial RuO 2 , with an ultrasmall overpotential of 189 mV at 10 mA cm −2 and no signs of deactivation even after 800 h of electrolysis in 0.5 m H 2 SO 4 at 10 mA cm −2 . When applied as the anode in a proton exchange membrane water electrolyzer, the cost‐efficient RuO 2 /MnO 2 /CC catalyst only requires a cell voltage of 1.661 V to achieve the water‐splitting current of 1 A cm −2 , and the noble metal cost is as low as US$ 0.00962 cm −2 , indicating potential for practical applications.
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