Controlled Adsorption Boosting the Cumulation of H2O2 Based on the Chain Mail Catalyst. Issue 47 (26th October 2022)

• Record Type: Journal Article
• Authors: Zhao, Yong‐Yan; Duan, Guangxin; He, Jing‐Hui; Lu, Jian‐Mei
• Is Part Of: Advanced energy materials. Volume 12:Issue 47(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-10-26
• Subjects: chain mail catalysts -- limited accumulation -- pulsed catalysis -- slow kinetics; Energy harvesting -- Materials -- Periodicals; Energy conversion -- Materials -- Periodicals; Energy storage -- Materials -- Periodicals; Photovoltaics -- Periodicals; Fuel cells -- Periodicals; Thermoelectric materials -- Periodicals; 621.31
• DOI: 10.1002/aenm.202203113
• Languages: English
• ISSNs: 1614-6832

Abstract

Abstract: Synthesis of H2 O2 through oxygen electro‐reduction is a green sustainable route but suffers from the slow kinetics and limited cumulation of H2 O2, because of the exceedingly slow oxygen diffusion and oxygen being directly reduced to water. Here, it has been proposed voltage pulse‐regulated catalysis achieves the continuous accumulation of H2 O2 concentrations up to 50 times greater than constant catalysis based on the chain mail catalyst, which is capable of catalysis steadily for 3.6 million pulses (2000 h) at one current level. When using a flow cell, the preparation rate of 39 977 mmol gcat −1 h −1 is achieved, exceeding previous records. Because the applied voltage regulates the adsorption of O2 / H2 O2 from the catalyst, as verified by molecular dynamics simulations, the chain mail catalyst exhibits a lower barrier to oxygen adsorption than the direct reduction of oxygen to water, achieving rapid and continuous cumulation. In addition, the direct use of in‐situ produced H2 O2 achieves complete sterilization in two minutes demonstrating the potential for application at an industrial level. Abstract : To surmount the limited accumulation in electrochemical oxygen reduction reaction, pulse‐regulated catalysis based on an ultra‐stable cage catalyst has been introduced. The intermittent potentials can provide time for the creeping diffusion of O2 and H2 O2 to reach a 50‐fold higher concentration accumulation than that generated by constant potential catalysis.