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Lattice Defects Coupled with Support Modification Enable a BiNi-Co₃O₄/CP Catalyst for High-Efficiency Acidic Oxygen

Xu Ge¹, Ke Xu¹, Zhiwen Liu¹

¹State Key Laboratory of Fine Chemicals, Dalian University of Technology, 116024 Dalian, China.

ACS Applied Materials & Interfaces

|October 9, 2025

Summary

This study introduces a novel Bi and Ni codoped Co3O4 catalyst synthesized via a molten salt method. This engineered catalyst significantly enhances the acidic oxygen evolution reaction (OER) performance and stability.

Keywords:

Co3O4 acidic oxygen evolution reaction lattice defects support modification water electrolysis

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Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction

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Published on: April 10, 2018

Area of Science:

Materials Science
Electrochemistry
Catalysis

Background:

Lattice defect engineering and support modification are key strategies to improve catalyst activity.
Optimizing catalyst electronic structures is crucial for enhancing intrinsic activity.

Purpose of the Study:

To develop a highly efficient and stable electrocatalyst for the acidic oxygen evolution reaction (OER).
To integrate lattice defect engineering and support modification for synergistic performance enhancement.

Main Methods:

In situ synthesis of Bi and Ni codoped Co3O4 on carbon paper (BiNi-Co3O4/CP) using a one-step molten salt method.
Characterization using in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS).

Main Results:

Bi doping induced lattice defects, optimizing Co active sites and boosting catalytic activity.
Synergistic Ni-Bi interaction created a porous carbon support, increasing active site exposure and bubble desorption.
BiNi-Co3O4/CP demonstrated ultralow overpotential (275 mV at 10 mA cm-2) and 110 h stability in 0.5 M H2SO4 for OER.
Reduced formation of the *OOH intermediate and interfacial water adsorption confirmed by DRIFTS.

Conclusions:

The synergistic "lattice defect-support modification" approach is effective for designing efficient acidic OER electrocatalysts.
BiNi-Co3O4/CP offers a promising paradigm for high-performance and stable electrocatalysis in acidic media.