过电位
析氧
电催化剂
催化作用
钴
石墨烯
材料科学
退火(玻璃)
化学
化学工程
氧气
密度泛函理论
分解水
电化学
无机化学
电极
纳米技术
物理化学
计算化学
冶金
有机化学
光催化
工程类
作者
Qiaoqiao Zhang,Zhiyao Duan,Min Li,Jingqi Guan
摘要
Development of high-efficiency single-atom catalysts (SACs) for the oxygen evolution reaction (OER) is challenging. Herein, we report a facile annealing strategy to construct an atomically dispersed cobalt- and nitrogen-codoped graphene catalyst for high-efficiency OER. The as-prepared 0.7-Co@NG-750 electrocatalyst requires an ultra-low onset overpotential of approximately 210 mV on a glassy carbon electrode in both 1.0 M KOH and 0.1 M KOH solutions. The density functional theory (DFT) calculations reveal that the theoretical overpotential on Co-N4 and Co-N2C2 sites is 0.41 and 0.53 V, respectively, and these might be efficient active sites for electrocatalytic water oxidation.
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