Kim, Hyunki Kim, Junhyeong Kim, Jooyoung Han, Gyeong Ho Guo, Wenwu Hong, Seokjin Park, Hyun S. Jang, Ho Won Kim, Soo Young Ahn, Sang Hyun 2024-01-19T15:02:59Z 2024-01-19T15:02:59Z 2021-09-05 2021-04 0926-3373 https://pubs.kist.re.kr/handle/201004/117201 The insufficient performance of current oxygen evolution reaction (OER) electrodes limits the realization of clean hydrogen production via proton exchange membrane water electrolyzers (PEMWEs). Herein, an innovative electrode design with an ultra-low Ir loading is proposed to achieve high catalytic OER performance, catalyst utilization, conductivity, and mass transfer. The microgram-scale loading of Ir on a highly roughened dendritic Au support is controlled by the number of Ir deposition pulses and, together with Ir coverage, which significantly affect the Ir electronic structure and intrinsic OER activity. Further control of the Ir electronic structure is achieved by forming Ir oxides via electrochemical and thermal oxidation to adjust the activity-stability balance. A PEMWE employing the fabricated electrode demonstrates substantially low ohmic and mass-transfer losses, especially in the higher-current-density region. As a result, superior cell performance with extremely high mass activity is achieved, significantly exceeding the mass activities of state-of-the-art Ir-based anodes. English ELSEVIER OXYGEN EVOLUTION REACTION BIFUNCTIONAL ELECTROCATALYST HYDROGEN-PRODUCTION IRIDIUM CATALYST IR STABILITY MECHANISMS OXIDATION REDUCTION Dendritic gold-supported iridium/iridium oxide ultra-low loading electrodes for high-performance proton exchange membrane water electrolyzer Article 10.1016/j.apcatb.2020.119596 1 APPLIED CATALYSIS B-ENVIRONMENTAL, v.283 APPLIED CATALYSIS B-ENVIRONMENTAL 283 scie scopus 000600016300005 2-s2.0-85092504888 Chemistry, Physical Engineering, Environmental Engineering, Chemical Chemistry Engineering Article OXYGEN EVOLUTION REACTION BIFUNCTIONAL ELECTROCATALYST HYDROGEN-PRODUCTION IRIDIUM CATALYST IR STABILITY MECHANISMS OXIDATION REDUCTION Proton exchange membrane water electrolyzer Oxygen evolution reaction Ultra-low Ir loading electrode Self-terminated electrodeposition