Interface Engineering of Co‐LDH@MOF Heterojunction in Highly Stable and Efficient Oxygen Evolution Reaction. Issue 2 (25th November 2020)

• Record Type: Journal Article
• Authors: Li, Zhenxing; Zhang, Xin; Kang, Yikun; Yu, Cheng Cheng; Wen, Yangyang; Hu, Mingliang; Meng, Dong; Song, Weiyu; Yang, Yang
• Is Part Of: Advanced science. Volume 8:Issue 2(2021)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2020-11-25
• Subjects: density functional theory -- interface engineering -- layered double hydroxide -- metal–organic frameworks -- oxygen evolution reaction; Science -- Periodicals; 505
• DOI: 10.1002/advs.202002631
• Languages: English
• ISSNs: 2198-3844

Abstract

Abstract: The electrochemical splitting of water into hydrogen and oxygen is considered one of the most promising approaches to generate clean and sustainable energy. However, the low efficiency of the oxygen evolution reaction (OER) acts as a bottleneck in the water splitting process. Herein, interface engineering heterojunctions between ZIF‐67 and layered double hydroxide (LDH) are designed to enhance the catalytic activity of the OER and the stability of Co‐LDH. The interface is built by the oxygen (O) of Co‐LDH and nitrogen (N) of the 2‐methylimidazole ligand in ZIF‐67, which modulates the local electronic structure of the catalytic active site. Density functional theory calculations demonstrate that the interfacial interaction can enhance the strength of the CoOout bond in Co‐LDH, which makes it easier to break the H‐Oout bond and results in a lower free energy change in the potential‐determining step at the heterointerface in the OER process. Therefore, the Co‐LDH@ZIF‐67 exhibits superior OER activity with a low overpotential of 187 mV at a current density of 10 mA cm −2 and long‐term electrochemical stability for more than 50 h. This finding provides a design direction for improving the catalytic activity of OER. Abstract : The interface of Co‐LDH@ZIF‐67 is built by the oxygen of cobalt layered double hydroxide (Co‐LDH) and nitrogen of the ZIF‐67, which can modulate the electronic structure of the catalytical site. The Co‐LDH@ZIF‐67 exhibits superior catalytical activity in oxygen evolution reaction with a low overpotential of 187 mV at a current density of 10 mA cm −2 .