Formation of H <sub>2</sub> O <sub>2</sub> in Near‐Neutral Zn‐air Batteries Enables Efficient Oxygen Evolution Reaction

Rechargeable Zn-air batteries (ZABs) with near-neutral electrolytes hold promise as cheap, safe and sustainable devices, but they suffer from slow charge kinetics and remain poorly studied. Here we reveal a charge storage mechanism of near-neutral Zn-air batteries that is mediated by formation of dissolved hydrogen peroxide upon cell discharge and its oxidation upon charge. This H<sub>2</sub>O<sub>2</sub>-mediated pathway facilitates oxygen evolution reaction (OER) at ~1.5 V vs. Zn<sup>2+</sup>/Zn, reducing charge overpotentials by ~0.2-0.5 V and mitigating carbon corrosion-a common issue in ZABs. The manifestation of this mechanism strongly depends on the electrolyte composition and positive electrode material, contributing up to ~60 % of the capacity with ZnSO<sub>4</sub> solutions and carbon nanotubes. Enhancing the H<sub>2</sub>O<sub>2</sub>-mediated pathway offers a route to higher energy efficiency and durability in near-neutral ZABs, advancing practical, sustainable energy storage.

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Publication Details

Journal
Angewandte Chemie International Edition
Published
2024-12-04
DOI
https://doi.org/10.1002/anie.202418792
Citations
12
Primary Topic
Advanced battery technologies research
Type
article
Field-Weighted Citation Impact
2.50
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article

Formation of H 2 O 2 in Near‐Neutral Zn‐air Batteries Enables Efficient Oxygen Evolution Reaction

Amit Ohayon, Menny Shalom, Nicole Leifer, Malachi Noked et al.
12 citations
Angewandte Chemie International Edition
Advanced battery technologies research
2.50
article

Formation of H 2 O 2 in Near‐Neutral Zn‐air Batteries Enables Efficient Oxygen Evolution Reaction

Amit Ohayon, Menny Shalom, Nicole Leifer, Malachi Noked, Roman R. Kapaev, Alagar Raja Kottaichamy, Langyuan Wu
article en
12 citations

Abstract

Rechargeable Zn-air batteries (ZABs) with near-neutral electrolytes hold promise as cheap, safe and sustainable devices, but they suffer from slow charge kinetics and remain poorly studied. Here we reveal a charge storage mechanism of near-neutral Zn-air batteries that is mediated by formation of dissolved hydrogen peroxide upon cell discharge and its oxidation upon charge. This H<sub>2</sub>O<sub>2</sub>-mediated pathway facilitates oxygen evolution reaction (OER) at ~1.5 V vs. Zn<sup>2+</sup>/Zn, reducing charge overpotentials by ~0.2-0.5 V and mitigating carbon corrosion-a common issue in ZABs. The manifestation of this mechanism strongly depends on the electrolyte composition and positive electrode material, contributing up to ~60 % of the capacity with ZnSO<sub>4</sub> solutions and carbon nanotubes. Enhancing the H<sub>2</sub>O<sub>2</sub>-mediated pathway offers a route to higher energy efficiency and durability in near-neutral ZABs, advancing practical, sustainable energy storage.

Angewandte Chemie International EditionVol. 64(5)
Ben-Gurion University of the Negev (IL), Bar-Ilan University (IL)
Openalex Percentile: Top 10%
Advanced battery technologies research
2.50
DOIOpen Access PDFOpenAlex
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Formation of H <sub>2</sub> O <sub>2</sub> in Near‐Neutral Zn‐air Batteries Enables Efficient Oxygen Evolution Reaction — Amit Ohayon, Menny Shalom, et al. · Angewandte Chemie International Edition (2024) | TGRS Research Map | TGRS