Development of Ni-Ir Oxide Composites as Oxygen Catalysts for an Anion-Exchange Membrane Water Electrolyzer
- Authors
- Park, Deok-Hye; Kim, Min-Ha; Lee, Hak-Joo; Lee, Woo-Jun; Byeon, Jeong-Hyeon; Kim, Ji-Hwan; Jang, Jae-Sung; Park, Kyung-Won
- Issue Date
- Feb-2022
- Publisher
- WILEY
- Keywords
- composite structures; iridium oxide; nickel oxide; oxygen evolution reaction; water splitting
- Citation
- ADVANCED MATERIALS INTERFACES, v.9, no.5
- Journal Title
- ADVANCED MATERIALS INTERFACES
- Volume
- 9
- Number
- 5
- URI
- http://scholarworks.bwise.kr/ssu/handle/2018.sw.ssu/42005
- DOI
- 10.1002/admi.202102063
- ISSN
- 2196-7350
- Abstract
- In water splitting, anode catalysts for the oxygen evolution reaction (OER), which is the rate-determining step, are more critical than cathode catalysts. Herein, the authors prepare Ni-IrOx composite catalysts consisting of NiO and IrO2 for the OER by a solid-state reaction with different ratios of NiO to IrO2 and reaction temperatures. In particular, Ni-IrOx-400 with a molar ratio of NiO/IrO2 = 1:1 heated at 400 degrees C shows the best OER performance. In the overall water splitting test using an anion exchange membrane (AEM) water electrolyzer, the single cell with Ni-IrOx-400 as the anode catalyst shows current densities of 1454.8 mA cm(-2), respectively, measured at 1.8 V. Furthermore, the stability tests of the AEM single cells are carried out at 50 degrees C under a constant current density of 500 mA cm(-2). The single cell with Ni-IrOx-400 shows only a slight increase in the overpotential (rate: 2.0 mV h(-1)) for 100 h owing to the enhanced stability of Ni-IrOx-400 compared to IrO2 (12.5 mV h(-1)). The improved OER performance of the Ni-IrOx-400 may be attributed to a composite structure that can prevent particle agglomeration and thus preserve the active sites during the OER.
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