Fabrication of Highly Efficient 1D Pod-like NiFe2O4-Ni x Fe1－x S Heterogeneous Electrocatalysts for Enhanced Oxygen Evolution

doi:10.7503/cjcu20250156

Abstract

Abstract:

To address the challenges of insufficient activity and sluggish kinetics in oxygen evolution reaction（OER） catalysts， this study innovatively designed and synthesized a one-dimensional pod-like NiFe₂O₄-Ni _x Fe_1－_x S heterojunction material via a two-step method combining electrospinning and sulfurization calcination. By regulating the sulfurization temperature（350—550 ℃）， the interfacial heterostructure and component synergy were optimized. Characterization results revealed that the sample sulfurized at 450 ℃（NiFe₂O₄-Ni _x Fe_1－_x S-450） exhibited that Ni _x Fe_1－_x S nanosheets uniformly anchored on NiFe₂O₄ nanorods， forming a stable heterointerface with coexisting Fe²⁺/Fe³⁺ and Ni²⁺/Ni³⁺ multivalent states， along with enriched oxygen vacancies. Electrochemical tests demonstrated outstanding OER performance in 1 mol/L KOH， achieving low overpotentials of 344 and 396 mV at current densities of 10 and 50 mA/cm²， respectively， and a Tafel slope of 40.7 mV/dec. The Electronic redistribution at the heterointerface enhanced exposed active sites and oxygen vacancies accelerated charge transfer. The one-dimensional pod-like structure improved mass transport efficiency and structural stability. This work provides a new paradigm for the rational design of transition metal-based heterojunction catalysts through structure-performance synergy， offering valuable insights for advancing efficient water-splitting technologies.

Key words: Oxygen evolution reaction, Heterointerface, Charge transfer, One-dimensional pod-like structure

CLC Number:

O643.3

TrendMD:

CHEN Hong, ZHANG Hang, FU Siyu, ZHANG Xin, MU Jiajia. Fabrication of Highly Efficient 1D Pod-like NiFe₂O₄-Ni _x Fe_1－_x S Heterogeneous Electrocatalysts for Enhanced Oxygen Evolution[J]. Chem. J. Chinese Universities, 2025, 46(10): 20250156.

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References 34

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Fabrication of Highly Efficient 1D Pod-like NiFe₂O₄-Ni _x Fe_1－_x S Heterogeneous Electrocatalysts for Enhanced Oxygen Evolution

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