Highly surface electron-deficient Co_(9)S_(8) nanoarrays for enhanced oxygen evolution

• 作者: Haoxuan Zhang Jingyu Wang Qilin Cheng Petr Saha Hao Jiang
• 来源期刊: 绿色能源与环境:英文版
• 学科: 化学
• 关键词: Electron deficiency Co_(9)S_(8) Nanoarray ELECTROCATALYST Oxygen evolution reaction
• 年，卷（期）: 2020,（4）
• 页码范围: 492-498
• 页数: 7页
• 分类号: O64

摘要

Tailoring valence electron delocalization of transition metal center is of importance to achieve highly-active electrocatalysts for oxygen evolution reaction(OER).Herein,we demonstrate a“poor sulfur”route to synthesize surface electron-deficient Co_(9)S_(8) nanoarrays,where the binding energy(BE)of Co metal center is considerably higher than all reported Co_(9)S_(8)-based electrocatalysts.The resulting Co_(9)S_(8) electrocatalysts only require the overpotentials(h)of 265 and 326 mV at 10 and 100 mA cm^(-2) with a low Tafel slope of 56 mV dec^-(1) and a 60 hlasting stability in alkaline media.The OER kinetics are greatly expedited with a low reaction activation energy of 27.9 kJ mol^-(1) as well as abundant OOH*key intermediates(24%),thus exhibiting excellent catalytic performances.The surface electron-deficient engineering gives an available strategy to improve the catalytic activity of other advanced non-noble electrocatalysts.