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Protocol of Electrochemical Test and Characterization of Aprotic Li-O2 Battery

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Spin-Polarization Strategy for Enhanced Acidic Oxygen Evolution Activity.

Ling Li¹, Jing Zhou², Xiao Wang³

¹College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Jiangsu, 215123, China.

Advanced Materials (Deerfield Beach, Fla.)

|July 12, 2023

Summary

This summary is machine-generated.

This study introduces a novel spin-polarization strategy using manganese-doped ruthenium dioxide (RuO2) to boost the acidic oxygen evolution reaction (OER) for industrial applications.

Keywords:

RuO2 acidic magnetic field oxygen evolution reaction spin

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Area of Science:

Materials Science
Electrochemistry
Catalysis

Background:

Spin-polarization is a promising approach for enhancing the oxygen evolution reaction (OER) due to spin-dependent behaviors of intermediates and products.
Few ferromagnetic catalysts have been practically reported for acidic OER, limiting industrial applications.

Purpose of the Study:

To develop a spin-polarization-mediated strategy to create ferromagnetism in antiferromagnetic RuO2.
To enhance the acidic OER activity of RuO2 through dilute manganese (Mn2+) doping.

Main Methods:

Dilute Mn2+ doping of RuO2 to induce ferromagnetism.
Element-selective X-ray magnetic circular dichroism (XMCD) to probe magnetic coupling.
First-principles calculations to interpret magnetic interactions.
Electrochemical measurements to evaluate OER activity and stability.

Main Results:

Ferromagnetic coupling between Mn and Ru ions was confirmed, consistent with the Goodenough-Kanamori rule.
Mn-doped RuO2 (Mn-RuO2) exhibited enhanced OER activity, with a low overpotential of 143 mV at 10 mA cm-2.
Magnetic field significantly enhanced OER activity and stability, showing negligible decay over 480 hours.
Intrinsic turnover frequency improved to 5.5 s-1 at 1.45 VRHE.

Conclusions:

The developed spin-engineering strategy effectively enhances acidic OER activity and stability in RuO2.
This work presents a new avenue for designing efficient electrocatalysts by leveraging spin properties.