Laser-induced immobilization of an amorphous iron-phosphate/Fe3O4 composite on nickel foam for efficient water oxidation

Yan Zou; Man Jin; Dongdong Zhu; Yu-Jia Tang

doi:10.1039/d3cc04070d

Laser-induced immobilization of an amorphous iron-phosphate/Fe₃O₄ composite on nickel foam for efficient water oxidation

Chem Commun (Camb). 2023 Dec 14;59(100):14851-14854. doi: 10.1039/d3cc04070d.

Authors

Yan Zou¹, Man Jin¹, Dongdong Zhu¹, Yu-Jia Tang¹

Affiliation

¹ School of Chemistry and Materials Science, Institute of Advanced Materials and Flexible Electronics (IAMFE), Nanjing University of Information Science and Technology, 219 Ningliu Road, Nanjing 210044, P. R. China. tangyujia@nuist.edu.cn.

PMID: 38015465
DOI: 10.1039/d3cc04070d

Abstract

A laser-induced immobilization strategy is applied to prepare an amorphous iron-phosphate/Fe₃O₄ (L-FePO) composite on a nickel foam (NF) support. By laser-irradiating an iron hydrogen phosphate (FeHP) precursor, a melting and oxidation process leads to the generation of L-FePO with hierarchical pores and an amorphous structure. L-FePO shows exceptional electrocatalytic performance for the OER in an alkaline electrolyte, demonstrating an overpotential of 256 mV at 100 mA cm^-2, a Tafel slope of 71 mV dec^-1, and good stability over 100 h. The active Fe₃O₄, partially dissolved phosphate, and newly formed FeOOH species provide abundant active sites, contributing to the excellent OER performance.