Issue 21, 2023

Modulation of interfacial electronic structure in Ni3P/NiFe LDH p–n junction for efficient oxygen evolution at ampere-level current density

Abstract

The development of efficient non-noble metal catalysts that can operate at high current densities for sluggish oxygen evolution is crucial for the large-scale commercialization of water electrolysis. Herein, we have developed a heterostructure oxygen evolution anode material that satisfies the requirements of ampere-level current density using a straightforward calcination-electroplating approach. Due to the natural p–n junction interface, a built-in electric field is induced in the Ni3P/NiFe LDH electrode, resulting in high conductivity and low gas transmission resistance. As a result of its heterogeneous structure, abundant active sites, and rapid interfacial electron transfer, this Ni3P/NiFe LDH exhibits outstanding catalytic performance, achieving an oxygen evolution current density of 1.4 A cm−2 with an ultra-low overpotential of 304 mV. DFT calculations indicate that the formed p–n junction effectively drives electron transfer and directly influences the charge density surrounding the active center, thereby enhancing intrinsic activity. This study highlights the potential use of non-noble metal-based heterojunction materials as efficient catalysts for the oxygen evolution in alkaline water electrolysis.

Graphical abstract: Modulation of interfacial electronic structure in Ni3P/NiFe LDH p–n junction for efficient oxygen evolution at ampere-level current density

Supplementary files

Article information

Article type
Paper
Submitted
14 iyn 2023
Accepted
12 sen 2023
First published
13 sen 2023

Green Chem., 2023,25, 8606-8614

Modulation of interfacial electronic structure in Ni3P/NiFe LDH p–n junction for efficient oxygen evolution at ampere-level current density

X. Zhang, H. Xue, J. Sun, N. Guo, T. Song, J. Sun, Y. Hao and Q. Wang, Green Chem., 2023, 25, 8606 DOI: 10.1039/D3GC02105J

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