Directly Coated Iridium Nickel Oxide on Porous‐Transport Layer as Anode for High‐Performance Proton‐Exchange Membrane Water Electrolyzers. Issue 12 (28th March 2023)

• Record Type: Journal Article
• Authors: Kang, Sun Young; Park, Ji Eun; Jang, Ga Young; Choi, Changsoon; Cho, Yong‐Hun; Sung, Yung‐Eun
• Is Part Of: Advanced materials interfaces. Volume 10:Issue 12(2023)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2023-03-28
• Subjects: directly coated anodes -- iridium nickel alloys -- membrane‐electrode assemblies -- oxygen evolution reactions -- proton‐exchange membrane water electrolyzer; Materials science -- Periodicals; 620.11
• DOI: 10.1002/admi.202202406
• Languages: English
• ISSNs: 2196-7350

Abstract

Abstract: Developing a high‐performance anode design is important for a low‐cost proton‐exchange membrane water electrolyzer (PEMWE). In this study, an iridium nickel oxide directly coated anode (IrNiO x electrode) for high‐efficient PEMWE is reported. Five IrNiO x electrodes with different Ir‐to‐Ni ratios are developed using co‐electrodeposition. The resulting electrodes contain a thin IrNiO x layer on the carbon substrate. To develop the PEMWE incorporating IrNiOx electrode, the effect of fabrication methods, catalyst compositions, and porous transport layer are investigated. Consequently, the IrNiO x electrode prepared with 7:3 precursor solution (Ir0.5 Ni0.5 O x ) exhibits higher oxygen evolution reaction activity with a smaller overpotential than the electrode prepared with 10:0 precursor solution (IrO x ) and the commercial IrO2 . Furthermore, the performance of the PEMWE is higher with the Ir0.5 Ni0.5 O x electrode than that with the sprayed electrode with commercial IrO2 nanoparticles. This enhancement is attributed to the high electrochemical surface area caused by introducing Ni in IrO x . Additionally, the performance of the directly coated Ir0.5 Ni0.5 O x PEMWE is the highest reported in the literature. Abstract : Directly coated IrNiO x anode can be fabricated with an electro‐deposition process for proton exchange membrane water electrolyzers. The fabricated electrode shows not only high activity for oxygen evolution reaction but outstanding performance for the single‐cell. These results are contributed to the large electrochemical surface area derived from porous structure of the electrode.