Issue 43, 2021

In situ growth of an Fe-doped NiCo-MOF electrocatalyst from layered double hydroxide effectively enhances electrocatalytic oxygen evolution performance

Abstract

Two-dimensional (2D) metal–organic frameworks (MOFs) with highly exposed electro-active surface are regarded as promising oxygen evolution reaction (OER) electrocatalysts. This work demonstrates the in situ conversion of NiCo-LDH (LDH: double-layer hydroxide) into an Fe-doped NiCo-MOF on a conductive substrate (Fe-NiCo-MOF/NF) by a two-step hydrothermal method. The hierarchical book-like structure of the Fe-NiCo-MOF/NF electrode provides a large electro-active surface and improved electron transport capability, leading to enhanced oxygen evolution performance in an alkaline environment. Specifically, Fe-NiCo-MOF/NF needs an overpotential of 290 mV to drive a current density of 50 mA cm−2, which is 136 mV lower than that of the precursor NiCo-LDH. Additionally, its activity can be maintained for at least 20 h at a high current density of 200 mA cm−2. Moreover, the real active centers of the catalyst were discovered to be the metal oxides converted during the OER cycles. This work used a simple hydrothermal method to enhance the OER performance, which is convenient for direct application of MOF materials in electrocatalysis fields.

Graphical abstract: In situ growth of an Fe-doped NiCo-MOF electrocatalyst from layered double hydroxide effectively enhances electrocatalytic oxygen evolution performance

Supplementary files

Article information

Article type
Paper
Submitted
09 Sept. 2021
Accepted
22 Sept. 2021
First published
22 Sept. 2021

CrystEngComm, 2021,23, 7650-7657

In situ growth of an Fe-doped NiCo-MOF electrocatalyst from layered double hydroxide effectively enhances electrocatalytic oxygen evolution performance

T. Sun, S. Lin, Z. Xu and L. Li, CrystEngComm, 2021, 23, 7650 DOI: 10.1039/D1CE01220G

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