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Energy Materials and Devices 2023, 1(1): 9370002 https://doi.org/10.26599/EMD.2023.9370002
Research Article | Open Access | Issue | Published: 26 September 2023

Molybdate intercalated nickel–iron-layered double hydroxide derived Mo-doped nickel–iron phosphide nanoflowers for efficient oxygen evolution reaction

Show Author's Information Ruru Fu1,  Caihong Feng1,  Qingze Jiao1,2,  Kaixuan Ma1,  Suyu Ge1,  Yun Zhao1( )
Beijing Key Laboratory for Chemical Power Source and Green Catalysis, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing 100081, China
School of Materials and Environment, Beijing Institute of Technology, Zhuhai 519085, China
Keywords:
intercalation, electrocatalyst, oxygen evolution reaction, layered double hydroxide, phosphide
Cite this article:
Fu R, Feng C, Jiao Q, et al. Molybdate intercalated nickel–iron-layered double hydroxide derived Mo-doped nickel–iron phosphide nanoflowers for efficient oxygen evolution reaction. Energy Materials and Devices, 2023, 1(1): 9370002. https://doi.org/10.26599/EMD.2023.9370002
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Abstract Full text Electronic supplementary material About this article

The design of a highly efficient electrocatalyst for oxygen evolution reaction (OER) is of great significance to the clean energy conversion system. Herein, novel Mo-doped NiFe phosphide (Mo-NiFe-P) nanoflowers are developed as robust high-activity catalysts for OER via the phosphidation of MoO42− intercalated NiFe-layered double hydroxide (NiFe-LDH). The introduction of high valence Mo can significantly promote the catalytic activity of OER because of the strong electronic interactions with Ni and Fe. By tailoring the amount of molybdate intercalated into NiFe-LDH, the optimal phosphide shows outstanding overpotentials of 261 and 272 mV to drive current densities of 50 and 100 mA cm−2 in 1 mol L−1 KOH. This work demonstrates that the amount of molybdate influences the structure of phosphide prepared by the intercalated LDHs and also affects the electrocatalytic behavior. In addition, density functional theory (DFT) calculations show that introducing Mo could alter the intrinsic electronic structure of NiFe-P, which, in turn, could accelerate the reaction kinetics. This approach could be extended to the preparation of other cost-efficient phosphides for OER.


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About this article

Molybdate intercalated nickel–iron-layered double hydroxide derived Mo-doped nickel–iron phosphide nanoflowers for efficient oxygen evolution reaction

Show Author's information Ruru Fu1, Caihong Feng1, Qingze Jiao1,2, Kaixuan Ma1, Suyu Ge1, Yun Zhao1( )
Beijing Key Laboratory for Chemical Power Source and Green Catalysis, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing 100081, China
School of Materials and Environment, Beijing Institute of Technology, Zhuhai 519085, China

Abstract

The design of a highly efficient electrocatalyst for oxygen evolution reaction (OER) is of great significance to the clean energy conversion system. Herein, novel Mo-doped NiFe phosphide (Mo-NiFe-P) nanoflowers are developed as robust high-activity catalysts for OER via the phosphidation of MoO42− intercalated NiFe-layered double hydroxide (NiFe-LDH). The introduction of high valence Mo can significantly promote the catalytic activity of OER because of the strong electronic interactions with Ni and Fe. By tailoring the amount of molybdate intercalated into NiFe-LDH, the optimal phosphide shows outstanding overpotentials of 261 and 272 mV to drive current densities of 50 and 100 mA cm−2 in 1 mol L−1 KOH. This work demonstrates that the amount of molybdate influences the structure of phosphide prepared by the intercalated LDHs and also affects the electrocatalytic behavior. In addition, density functional theory (DFT) calculations show that introducing Mo could alter the intrinsic electronic structure of NiFe-P, which, in turn, could accelerate the reaction kinetics. This approach could be extended to the preparation of other cost-efficient phosphides for OER.

Keywords: intercalation, electrocatalyst, oxygen evolution reaction, layered double hydroxide, phosphide

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Received: 02 August 2023
Revised: 06 September 2023
Accepted: 09 September 2023
Published: 26 September 2023
Issue date: September 2023

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© The Author(s) 2023. Published by Tsinghua University Press.

Acknowledgements

The authors would like to thank the Analysis & Testing Center, Beijing Institute of Technology, SCI-GO lab (www.sci-go.com) and Shiyanjia lab (www.shiyanjia.com).

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