KIr4O8 Nanowires with Rich Hydroxyl Promote Oxygen Evolution Reaction in Proton Exchange Membrane Water Electrolyzer

© 2024 Wiley‐VCH GmbH.

Détails bibliographiques
Publié dans:Advanced materials (Deerfield Beach, Fla.). - 1998. - 36(2024), 30 vom: 01. Juli, Seite e2402643
Auteur principal: Li, Zhenyu (Auteur)
Autres auteurs: Li, Xiang, Wang, Mengna, Wang, Qi, Wei, Pengfei, Jana, Subhajit, Liao, Ziqi, Yu, Jingcheng, Lu, Fang, Liu, Tianfu, Wang, Guoxiong
Format: Article en ligne
Langue:English
Publié: 2024
Accès à la collection:Advanced materials (Deerfield Beach, Fla.)
Sujets:Journal Article Ir‐based catalyst adsorbate evolution mechanism hydroxyl oxygen evolution reaction proton exchange membrane water electrolyzer
Description
Résumé:© 2024 Wiley‐VCH GmbH.
The sluggish kinetics for anodic oxygen evolution reaction (OER) and insufficient catalytic performance over the corresponding Ir-based catalysts are still enormous challenges in proton exchange membrane water electrolyzer (PEMWE). Herein, it is reported that KIr4O8 nanowires anode catalyst with more exposed active sites and rich hydroxyl achieves a current density of 1.0 A cm-2 at 1.68 V and possesses excellent catalytic stability with 1230 h in PEMWE. Combining in situ Raman spectroscopy and differential electrochemical mass spectroscopy results, the modified adsorbate evolution mechanism is proposed, wherein the rich hydroxyl in the inherent structure of KIr4O8 nanowires directly participates in the catalytic process for favoring the OER. Density functional theory calculation results further suggest that the enhanced proximity between Ir (d) and O (p) band center in KIr4O8 can strengthen the covalence of Ir-O, facilitate the electron transfer between adsorbents and active sites, and decrease the energy barrier of rate-determining step from OH* to O* during the OER
Description:Date Revised 25.07.2024
published: Print-Electronic
Citation Status PubMed-not-MEDLINE
ISSN:1521-4095
DOI:10.1002/adma.202402643