High-Porosity, Layered Iridium Oxide as an Efficient, Durable Anode Catalyst for Water Splitting

Open AccessCCS ChemistryRESEARCH ARTICLES13 Jan 2024High-porosity, layered iridium oxide as an efficient, durable anode catalyst for water splitting Zhoubing Xie, Xiao Liang, Zhenye Kang, Yongcun Zou, Xiyang Wang, Yimin A. Wu, Graham King, Qi Liu, Yalan Huang, Xiao Zhao, Hui Chen and Xiaoxin Zou Zhoubing Xie , Xiao Liang , Zhenye Kang , Yongcun Zou , Xiyang Wang , Yimin A. Wu , Graham King , Qi Liu , Yalan Huang , Xiao Zhao , Hui Chen and Xiaoxin Zou https://doi.org/10.31635/ccschem.024.202303586 SectionsSupplemental MaterialAboutPDF ToolsAdd to favoritesDownload CitationsTrack Citations ShareFacebookTwitterLinked InEmail Lowing iridium (Ir) loading without sacrificing activity and durability is the inexorable requirement of future development of proton exchange membrane water electrolyzer (PEMWE). Here, we present the synthesis of iridate-derived, layered iridium oxide microparticles (dubbed as p-L-IrO2) with a high open porosity of c.a. 74%, and their structural advantages for the fabrication of efficient, durable, low-Ir-loading anode catalytic layer in PEMWE. The p-L-IrO2 material is synthesized by an easily scalable route involving acid treatment of alkali metal salt-templated iridates that form in mixed alkali metal nitrates-hydroxides at low temperature. The combination of high-porosity morphology and layered structure in the material preferentially exposes a high density of hydroxylated edge sites, which are catalytically active and stable for the oxygen evolution reaction via a structurally hydroxyl group-participated adsorbate evolution mechanism. This material is further demonstrated to enable the fabrication of low-Ir-loading anode catalytic layer in PEMWE, which can afford an excellent catalytic performance (2.7 A cm−2@1.9 V@80 °C; membrane: NafionTM N115) due to the simultinous reduction of activation and mass transport losses, and retains catalytic activity for 2,300 hours at 1.0 A cm−2 current density. Download figure Download PowerPoint Previous articleNext article FiguresReferencesRelatedDetails Issue AssignmentNot Yet AssignedSupporting Information Copyright & Permissions© 2024 Chinese Chemical Society Downloaded 522 times PDF downloadLoading ...