过电位
析氧
电催化剂
分解水
塔菲尔方程
氢氧化物
钴
催化作用
无机化学
兴奋剂
电解
电化学
电解水
过渡金属
化学
电极
材料科学
物理化学
光催化
电解质
生物化学
光电子学
作者
Mengmeng Jin,Jiewei Li,Jingchang Gao,Weilan Liu,Jing Han,Haimin Liu,Da Zhan,Linfei Lai
标识
DOI:10.1016/j.jcis.2020.11.015
摘要
The design of electrocatalysts with lower overpotential is of great significance for water splitting. Herein, cobalt hydroxide carbonate (CCH) has been used as a model to demonstrate the boost of its oxygen evolution reaction (OER) activity by atomic doping of W6+ (W-CCH). The 5 at % W doping reduced the OER overpotential of CCH by 95.3 mV at 15 mA cm−2, and increased the current density by 2.8 times at 1.65 V. 5%W-PCCH || 5%W-CCH-based electrolyzer only required a potential of 1.65 V to afford 10 mA cm−2 for full water splitting. The W6+ in CCH are active sites for O2– adsorption and induced an incesaed electron density near the Fermi level, which facilitates the charge transfer during electrocatalysis. The W6+ doping has been validated as an efficient booster for transition-metal carbonate hydroxides-based electrocatalysts, which has half or more than half-filled d-bands.
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