Dynamic Photoelectrochemical Device Using an Electrolyte-Permeable NiOx/SiO2/Si Photocathode with an Open-Circuit Potential of 0.75 V
- Authors
- Jung, Jin-Young; Yu, Jin-Young; Lee, Jung-Ho
- Issue Date
- Mar-2018
- Publisher
- American Chemical Society
- Keywords
- photoelectrochemical cells; water splitting; silicon; NiOx; semiconductor junction
- Citation
- ACS Applied Materials and Interfaces, v.10, no.9, pp.7955 - 7962
- Indexed
- SCIE
SCOPUS
- Journal Title
- ACS Applied Materials and Interfaces
- Volume
- 10
- Number
- 9
- Start Page
- 7955
- End Page
- 7962
- URI
- https://scholarworks.bwise.kr/erica/handle/2021.sw.erica/6407
- DOI
- 10.1021/acsami.7b16918
- ISSN
- 1944-8244
- Abstract
- As a thermodynamic driving force obtained from sunlight, the open-circuit potential (OCP) in photo-electrochemical cells is typically limited by the photovoltage (V-ph). In this work, we establish that the OCP can exceed the value of V-ph when an electrolyte-permeable NiOx thin film is employed as an electrocatalyst in a Si photocathode. The built-in potential developed at the NiOx/Si junction is adjusted in situ according to the progress of the NiOx hydration for the hydrogen evolution reaction (HER). As a result of decoupling of the OCP from V-ph, a high OCP value of 0.75 V (vs reversible hydrogen electrode) is obtained after 1 h operation of HER in an alkaline electrolyte (pH = 14), thus outperforming the highest value (0.64 V) reported to date with conventional Si photoelectrodes.
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