Reconstruction optimization of distorted FeOOH/Ni hydroxide for enhanced oxygen evolution reaction

作者：Feng, Jinxian; Chen, Mingpeng; Zhou, Pengfei; Liu, Di; Chen, Yu-Yun; He, Bingchen; Bai, Haoyun; Liu, Dong; Ip, Weng Fai; Chen, Shi; Liu, Detao; Feng, Wenlin; Ni, Jun; Pan, Hui^*

来源：Materials Today Energy, 2022, 27: 101005.

DOI：10.1016/j.mtener.2022.101005

• Distorted FeOOH/Ni hydroxide
• Surface reconstruction
• Interface
• Oxygen evolution reaction
• Electrocatalyst

Oxygen evolution reaction (OER) is one of the most important anodic reactions in electrochemical conversion devices. Although a lot of OER electrocatalysts have been developed, the actual active sites during OER have not been fully understood. Herein, we report that the distorted FeOOH/Ni hydroxide on Ni foam (NF) (d-FeOOH/Ni hydroxide-NF) shows better electrochemical performance (1.50 Vat 100 mA/ cm(2) and long-term stability for 32 h at 425 mA/cm(2)) than crystalline FeOOH/Ni hydroxide-NF (c-FeOOH/ Ni hydroxide-NF) and outperforms most of the state-of-the-art electrocatalysts. By using in-situ and ex situ techniques, we show that the interfaces in d-FeOOH/Ni hydroxide-NF, which are the key active sites for OER, are well maintained during the reaction, leading to promoted catalytic performance and longterm stability at high current density. We demonstrate that the structure rearrangement in d-FeOOH/Ni hydroxide-NF endows high flexibility of the lattice and tolerates the volume expansion during OER. Our study provides an insightful understanding on the catalytic performance of Fe-Ni-based electrocatalysts and the guidance to their design and synthesis for practical application.

• 单位
  浙江工业大学