Reconstruction Optimization of Distorted FeOOH/Ni Hydroxide for Enhanced Oxygen Evolution Reaction
Reconstruction Optimization of Distorted FeOOH/Ni Hydroxide for Enhanced Oxygen Evolution Reaction
复制标题
用于增强析氧反应的扭曲 FeOOH/Ni 氢氧化物的重构优化
DOI：
10.1016/j.mtener.2022.101005
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发表时间：
2022
影响因子：
9.3
通讯作者：
Hui Pan
中科院分区：
文献类型：
--
作者：
Jinxian Feng;Mingpeng Chen;Pengfei Zhou;Di Liu;Yu-Yun Chen;Bingchen He;Haoyun Bai;Dong Liu;Weng Fai Ip;Shi Chen;Detao Liu;Wenlin Feng;Jun Ni;Hui Pan
析氧反应（OER）是电化学转换装置中最重要的阳极反应之一。尽管已经开发出许多OER电催化剂，但OER过程中的实际活性位点尚未完全了解。在此，我们报告称，泡沫镍 (NF) 上的变形 FeOOH/氢氧化镍 (d-FeOOH/氢氧化镍-NF) 表现出比晶体 FeOOH/氢氧化镍-NF (c-FeOOH/氢氧化镍-NF) 更好的电化学性能（100 mA/cm2 下 1.50 V，425 mA/cm2 下 32 小时的长期稳定性），并且优于大多数最先进的技术电催化剂。通过使用原位和异位技术，我们发现d-FeOOH/氢氧化镍-NF中的界面（OER的关键活性位点）在反应过程中得到了良好的维持，从而提高了催化性能并在高电流密度下保持了长期稳定性。我们证明，d-FeOOH/氢氧化镍-NF 中的结构重排赋予了晶格高度的灵活性，并能承受 OER 过程中的体积膨胀。我们的研究为铁镍基电催化剂的催化性能提供了深入的了解，并为其设计和合成的实际应用提供了指导。
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 V at 100 mA/cm2and long-term stability for 32 h at 425 mA/cm2) 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 long-term 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.