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Comparative Study on Hydrogen Evolution Reaction Activity of Electrospun Nanofibers with Diverse Metallic Ir and IrO2 Composition Ratios
- Title
- Comparative Study on Hydrogen Evolution Reaction Activity of Electrospun Nanofibers with Diverse Metallic Ir and IrO2 Composition Ratios
- Authors
- Kim, Su-jin; Jung, Hyeseung; Lee, Chongmok; Kim, Myung Hwa; Lee, Youngmi
- Ewha Authors
- 이종목; 이영미; 김명화; 김수진
- SCOPUS Author ID
- 이종목; 이영미; 김명화; 김수진
- Issue Date
- 2019
- Journal Title
- ACS SUSTAINABLE CHEMISTRY & ENGINEERING
- ISSN
- 2168-0485
- Citation
- ACS SUSTAINABLE CHEMISTRY & ENGINEERING vol. 7, no. 9, pp. 8613 - 8620
- Keywords
- Hydrogen evolution reaction; Nanofibers; Iridium metal; Iridium oxide; Electrospinning; DFT calculation
- Publisher
- AMER CHEMICAL SOC
- Indexed
- SCIE; SCOPUS
- Document Type
- Article
- Abstract
- Hydrogen evolution reaction (HER) is of importance in energy conversion processes. This paper reports the facile synthesis of iridium/iridium oxide nanofibers (Ir/IrO(2)NFs) with diverse Ir and IrO2 relative composition ratios and their electrocatalytic HER activities. Highly porous Ir/IrO(2)NFs are simply synthesized via electrospinning and the following calcination at various temperatures (300-900 degrees C). Different calcination temperature alters the actual composition of Ir/IrO(2)NFs: The higher the temperature, the greater IrO2 content exists. The HER activity of Ir/IrO(2)NFs is examined in 1 M H2SO4. Ir/IrO2NF calcined at 300 degrees C exhibits the best HER activity in terms of the onset potential, overpotential generating 50 mA cm(-2), turnover frequency, Tafel slope along with the decent stability for 5 h; the HER performance of this material even exceeds that of platinum, a benchmark HER catalyst. As the IrO2 content in Ir/IrO(2)NFs increases with a higher calcination temperature, the HER activity decreases. Ir/IrO2NF calcined at 900 degrees C consists of only IrO2 and presents the worst activity. DFT calculations show that hydrogen atom adsorption on metallic Ir (not IrO2) resembles that on Pt: similar adsorption energy and adsorbate-substrate distance. Both the experimental and theoretical results clearly demonstrate that metallic Ir rather than IrO2 is a good HER catalytic platform.
- DOI
- 10.1021/acssuschemeng.9b00402
- Appears in Collections:
- 자연과학대학 > 화학·나노과학전공 > Journal papers
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