View : 665 Download: 0
Single-Step Electrospun Ir/IrO2 Nanofibrous Structures Decorated with Au Nanoparticles for Highly Catalytic Oxygen Evolution Reaction
- Title
- Single-Step Electrospun Ir/IrO2 Nanofibrous Structures Decorated with Au Nanoparticles for Highly Catalytic Oxygen Evolution Reaction
- Authors
- Moon S.; Cho Y.-B.; Yu A.; Kim M.H.; Lee C.; Lee Y.
- Ewha Authors
- 이종목; 이영미; 김명화
- SCOPUS Author ID
- 이종목; 이영미; 김명화
- Issue Date
- 2019
- Journal Title
- ACS Applied Materials and Interfaces
- ISSN
- 1944-8244
- Citation
- ACS Applied Materials and Interfaces vol. 11, no. 2, pp. 1979 - 1987
- Keywords
- electrocatalysis; electrospinning; fibrous nanocomposite; gold; iridium oxide; oxygen evolution reaction
- Publisher
- American Chemical Society
- Indexed
- SCIE; SCOPUS
- Document Type
- Article
- Abstract
- Nanocomposites of gold (Au) and iridium (Ir) oxide with various compositions (denoted as AuxIr1-xOy, x = 0.05, 0.10, or 0.33, Au precursor molar ratio to Ir precursor) were synthesized via electrospinning and subsequent calcination method with two different solvent composition ratios of ethanol to N,N-dimethylformamide (DMF) in the electrospinning solution (ethanol/DMF = 70:30 or 50:50% v/v). Simple single-step electrospinning successfully fabricated a hierarchical nanostructure having Au nanoparticles formed on fibrous main frames of Ir/IrO2. Different solvent composition in the electrospinning solution induced the formation of main frames with distinct nanostructures; nanoribbons (AuxIr1-xOy-70) with ethanol/DMF = 70:30; and nanofibers (AuxIr1-xOy-50) with ethanol/DMF = 50:50. The pure Ir or Au counterparts (IrOy and Au) were also prepared by the same synthetic procedure as AuxIr1-xOy. Oxygen evolution reaction (OER) activities of as-synthesized AuxIr1-xOy were investigated in 0.5 M H2SO4 and compared to those of IrOy, Au, and commercial iridium (Ir/C, 20% Ir loading on Vulcan carbon). Among them, Au0.10Ir0.90Oy-50 exhibited the best OER activity, even better than previously reported catalysts containing both Ir and Au. The high OER activity of Au0.10Ir0.90Oy-50 was mainly attributed to the fiber frame structure and the optimal interfacial areas between Au and Ir/IrO2, which are electrophilic OER active sites. The stability of Au0.10Ir0.90Oy-50 was also evaluated to be much higher than that of Ir/C during OER. The current study suggests that the presence of Au on the Ir/IrO2 surface improves the OER activity of Ir/IrO2. © 2018 American Chemical Society.
- DOI
- 10.1021/acsami.8b14563
- Appears in Collections:
- 자연과학대학 > 화학·나노과학전공 > Journal papers
- Files in This Item:
There are no files associated with this item.
- Export
- RIS (EndNote)
- XLS (Excel)
- XML