Tuning the Formation Kinetics of *OOH Intermediate with Hollow Bowl-Like Carbon by Pulsed Electroreduction for Enhanced H₂O₂ Production

ACS Nano, Journal Year: 2025, Volume and Issue: unknown

Published: March 28, 2025

The electrochemical synthesis of hydrogen peroxide (H2O2) via the two-electron oxygen reduction reaction (2e- ORR) is a promising alternative to conventional anthraquinone method. However, due local alkalinization near catalyst surface, restricted replenishment and insufficient activated water molecule supply limit formation key *OOH intermediate. Herein, pulsed electrocatalysis approach based on structurally optimized S/N/O tridoped hollow carbon bowl has been proposed overcome this challenge. In an H-type electrolytic cell, method achieves superior H2O2 yield rate 55.6 mg h-1 mgcat.-1, approximately 1.6 times higher than potentiostatic (34.2 mgcat.-1), while maintaining Faradaic efficiency above 94.6%. situ characterizations, finite element simulations, density functional theory analyses unveil that application potentials mitigates OH- concentration, enhances activation proton generation, facilitates production within bowl-like structure. These effects synergistically accelerate kinetics intermediate by efficient generation *O2 *H2O intermediates, leading yields. This work develops strategy tune catalytic environments for diverse applications.

Language: Английский

Insight into the Hybrid Zn–Co/Air Batteries Coupling Faradic Redox and Oxygen Catalytic Reactions

Batteries & Supercaps, Journal Year: 2025, Volume and Issue: unknown

Published: April 17, 2025

Hybrid Zn–Co/air batteries achieve both high energy density and efficiency by coupling the oxygen catalytic reaction of Zn–air Faradic redox Zn–Co batteries. However, challenges exist in practical applications, including low utilization rate active material, insufficient activity, unmatched interfaces. These limitations hinder performance hybrid restrict their ability broader application scenarios. This work reviews recent development focuses on core issues. In terms material structure design, advancements are made microstructure optimization, defect engineering, ion doping, electrochemical activation. area activity improvements achieved through optimization support materials, structural engineering. field interface progress has been hydrophilicity hydrophobicity gas transfer channel electrode design. Finally, this summarizes future research directions technical to promote commercialization The in‐depth analysis aims provide valuable guidance researchers develop next‐generation high‐performance

Language: Английский