Iron-incorporated defective graphite by in-situ electrochemical oxidization for oxygen evolution reaction

作者：Feng, Jinxian; Zhong, Xiongwei; Chen, Mingpeng; Zhou, Pengfei; Qiao, Lulu; Bai, Haoyun; Liu, Dong; Liu, Di; Chen, Yu-Yun; Chen, Shi; Ni, Jun; Liu, Detao; Pan, Hui^*

来源：Journal of Power Sources, 2023, 561: 232700.

DOI：10.1016/j.jpowsour.2023.232700

• Graphite paper
• Defect
• Trace-iron incorporation
• Electrochemical oxidation
• Oxygen evolution reaction

Oxygen evolution reaction (OER) is an irreplaceable reaction as a half-cell reaction in various electrocatalytic systems. However, the four-electron transfer process makes it sluggish. Although many OER electrocatalysts have been developed, most of them are relatively expensive. Herein, we report a Fe3+-incorporated defective oxidized graphite (OGP) (Fe3+-OGP) as electrocatalyst for OER, which is obtained by a simple electrochemical oxidation of graphite paper (GP) in the Fe(NO3)3 solution. We find that the defects with oxygen-functional groups are achieved and Fe3+ is mainly combined with the C-O-C group after the anodization. Fe3+-OGP shows a low overpotential of 1.64 V at 10 mA cm-2, a stability up to 40 h at 40 mA cm-2, and a Faraday efficiency of > 97% in an alkaline solution. Most importantly, we show that the positively charged surface of Fe3+-OGP can enhance the adsorption of O species dramatically and promote OER in alkaline conditions greatly. Our study may provide an alternative way to develop novel electrocatalysts based on low-cost materials.

• 单位
  浙江工业大学; 清华大学