Optimization of Interfacial OH Accessibility by Constructing a Delayed–Release Membrane Electrode for Ampere–Level Hydrogen Production

Author:

Cheng Yu1ORCID,Chen Huanyu1,Xu Xinnan1,Dong Junjie1,Wang Mengfan2,Yan Chenglin2ORCID,Qian Tao1

Affiliation:

1. School of Chemistry and Chemical Engineering Nantong University Nantong 226019 P. R. China

2. Key Laboratory of Core Technology of High Specific Energy Battery and Key Materials for Petroleum and Chemical Industry College of Energy Soochow University Suzhou 215006 P. R. China

Abstract

AbstractAchieving a high current density during electrochemical overall water splitting is a promising strategy for industrial energy conversion. The mass diffusion rate of OH ions from the electrolyte to the interfacial active sites strongly influences the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) . Herein, the delayed‐release of OH ions modulated by a proper organic polymer membrane on the electrode surface can optimize the OH accessibility to the active sites (as indicated by the molecular dynamics simulations) is demonstrated and that van der Waals interaction force modulates the OH residence time in the reaction system. The remarkable performance of the membrane‐modified electrode  is achieved at ultra‐high current densities of 1.9 A cm−2 (with an HER overpotential of 602 mV) and 2 A cm−2 (with an OER overpotential of 459 mV) in 1 M KOH solution. Consequently, a super‐high current density of 1.3 A cm−2 is obtained for overall water splitting (at a voltage of only 2.2 V), which is 1.9‐fold higher than that of a benchmarked Pt/C‐IrO2 (684 mA cm−2). Therefore, the delayed‐release of OH has optimized the mass conversion efficiency of the active sites, thus improving the electrochemical performance of overall water splitting.

Funder

National Natural Science Foundation of China

Natural Science Foundation of Jiangsu Province

Natural Science Research of Jiangsu Higher Education Institutions of China

Publisher

Wiley

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