Dynamic Photoelectrochemical Device Using an Electrolyte-Permeable NiOx/SiO2/Si Photocathode with an Open-Circuit Potential of 0.75 V
- Title
- Dynamic Photoelectrochemical Device Using an Electrolyte-Permeable NiOx/SiO2/Si Photocathode with an Open-Circuit Potential of 0.75 V
- Author
- 이정호
- Keywords
- NiOx; photoelectrochemical cells; semiconductor junction; silicon; water splitting
- Issue Date
- 2018-02
- Publisher
- AMER CHEMICAL SOC
- Citation
- ACS APPLIED MATERIALS & INTERFACES, v. 10, No. 9, Page. 7955-7962
- 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.
- URI
- https://pubs.acs.org/doi/abs/10.1021/acsami.7b16918https://repository.hanyang.ac.kr/handle/20.500.11754/105368
- ISSN
- 1944-8244
- DOI
- 10.1021/acsami.7b16918
- Appears in Collections:
- COLLEGE OF ENGINEERING SCIENCES[E](공학대학) > MATERIALS SCIENCE AND CHEMICAL ENGINEERING(재료화학공학과) > Articles
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