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IrO2-ZnO Composite Nanorod Array as an Acid-Stable Electrocatalyst with Superior Activity for the Oxygen Evolution Reaction
- Title
- IrO2-ZnO Composite Nanorod Array as an Acid-Stable Electrocatalyst with Superior Activity for the Oxygen Evolution Reaction
- Authors
- Jin, Dasol; Yoo, Hyomin; Lee, Youngmi; Lee, Chongmok; Kim, Myung Hwa
- Ewha Authors
- 이종목; 이영미; 김명화
- SCOPUS Author ID
- 이종목; 이영미; 김명화
- Issue Date
- 2022
- Journal Title
- ACS APPLIED ENERGY MATERIALS
- ISSN
- 2574-0962
- Citation
- ACS APPLIED ENERGY MATERIALS vol. 5, no. 3, pp. 3810 - 3820
- Keywords
- iridium oxide (IrO2); zinc oxide (ZnO); nanorod array; oxygen evolution reaction; electrocatalyst
- Publisher
- AMER CHEMICAL SOC
- Indexed
- SCIE; SCOPUS
- Document Type
- Article
- Abstract
- An IrO2-ZnO composite nanorod array with distinct morphological features was successfully fabricated through a facile method via a simple acid-base reaction, followed by a postcalcination process. A modulation in the annealing treatment time (t) generated the variation in morphology, at a constant temperature (600 degrees C), and the nanorod-like growth on the surfaces was revealed at t >= 3 h. Especially, the IrO2-ZnO composite nanorod array exhibited superior OER catalytic activities (e.g., a potential of 1.481 V at 10 mA cm(-2) (vs RHE) and a Tafel slope of 42.9 mV dec(-1)). Moreover, there was no apparent potential shift with robust long-term cycling stability under acidic conditions, which were much better than those of IrO2 and commercial iridium (cIr) and comparable with those of the previously reported outstanding Ir-based OER catalysts. Considering that the nanorod array was fabricated with the loading of the Zn metal component, which showed generally low catalytic activity and poor durability, this study suggests a promising strategy with an extended synthetic methodology for preparing Zn-mixed metal oxides as highly efficient electrocatalysts.
- DOI
- 10.1021/acsaem.2c00292
- Appears in Collections:
- 자연과학대학 > 화학·나노과학전공 > Journal papers
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