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Unique amorphous/crystalline heterophase coupling for an efficient oxygen evolution reaction.

Sitian Bai¹, Yiwei Mou¹, Jin Wan¹

¹The School of Chemistry and Chemical Engineering, State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University, 174 Shazheng Street, Shapingba District, Chongqing City, 400044, PR China. zhanghj@cqu.edu.cn.

|November 30, 2022

Summary

This study introduces a novel amorphous/crystalline heterophase catalyst (NiFe/Ti4O7) for enhanced electrocatalysis. This carbon-free catalyst demonstrates superior performance and stability, outperforming commercial alternatives.

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Area of Science:

Materials Science
Electrochemistry
Nanotechnology

Background:

Designing amorphous/crystalline heterophase catalysts is an emerging field.
Carbon-free amorphous/crystalline heterophase catalysts have not been previously reported.

Purpose of the Study:

To synthesize and characterize a novel amorphous/crystalline heterophase catalyst for electrocatalysis.
To investigate the performance and stability of the new catalyst.

Main Methods:

A heterophase supporting strategy involving dual heat treatment was employed.
The catalyst was characterized using various experimental techniques.
Density functional theory (DFT) calculations were performed to understand the mechanism.

Main Results:

A unique amorphous/crystalline heterophase catalyst (NiFe/Ti4O7) was successfully synthesized.
The catalyst exhibited a low overpotential (256 mV) and small Tafel slope (47 mV dec-1).
Excellent endurance stability (>100 h) was observed, surpassing commercial RuO2 and other non-precious metal catalysts.

Conclusions:

The amorphous/crystalline heterophase coupling in NiFe/Ti4O7 enhances catalytic activity through electron transfer and increased active sites.
This work provides a new approach for synthesizing advanced electrocatalysts.
The findings can be extended to other transition metal-based catalysts.