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Unveiling an In Situ H₂O₂ Production: Rechargeable Zinc-H₂O₂ Battery Powering 26 LEDs.

Shivangi Mehta¹, Sukhjot Kaur¹, Kalpana Garg¹

¹Department of Chemistry, Indian Institute of Technology Ropar, Rupnagar, Punjab, 140001, India.

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|April 22, 2025

Summary

This summary is machine-generated.

This study introduces a novel manganese tungstate (MnWO₄) catalyst for efficient hydrogen peroxide (H₂O₂) production via oxygen reduction. The catalyst also enables a rechargeable zinc-H₂O₂ battery, demonstrating sustainable energy storage and electricity generation.

Keywords:

H2O2 production In situ infrared spectroscopy ORR Raman spectroscopy Zn‐H2O2 battery

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Area of Science:

Materials Science
Electrochemistry
Energy Storage

Background:

Growing energy demands necessitate advancements in efficient energy storage and electrocatalytic processes.
Simultaneous energy conversion and storage offer a promising approach to address these demands.

Purpose of the Study:

To develop a bifunctional catalyst for producing hydrogen peroxide (H₂O₂) from oxygen reduction and utilizing it in an energy storage device.
To explore the potential of MnWO₄ as a catalyst for H₂O₂ generation and its application in rechargeable batteries.

Main Methods:

Utilized manganese tungstate (MnWO₄) as a bifunctional electrocatalyst for the 2e⁻ oxygen reduction reaction (ORR).
Investigated H₂O₂ production efficiency and monitored it using in-situ electrochemical Raman and infrared spectroscopy.
Examined the influence of electrolyte composition (pH, carbonate species) on H₂O₂ production using micro-electrochemical studies.
Constructed and tested an aqueous rechargeable Zn-H₂O₂ battery employing the MnWO₄ catalyst.

Main Results:

Achieved a remarkable 98% H₂O₂ production efficiency at 0.37 V versus RHE.
The Zn-H₂O₂ battery demonstrated a cycle life of 136 hours and 43% energy efficiency.
The battery delivered a capacity of 25 mAh cm⁻² at 3 mA cm⁻² with over 90% cycle efficiency.
Successfully powered 26 blue LEDs for over 180 hours, showcasing practical application.

Conclusions:

The MnWO₄ catalyst effectively facilitates H₂O₂ production and energy storage in a Zn-H₂O₂ battery system.
This integrated approach offers a sustainable solution for energy demands by combining H₂O₂ generation and electricity production.
The developed Zn-H₂O₂ battery shows significant potential for long-term, efficient energy storage applications.