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Dynamic Photoelectrochemical Device Using an Electrolyte-Permeable NiOx/SiO2/Si Photocathode with an Open-Circuit Potential of 0.75 V

Authors
Jung, Jin-YoungYu, Jin-YoungLee, 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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Lee, Jung-Ho
ERICA 공학대학 (DEPARTMENT OF MATERIALS SCIENCE AND CHEMICAL ENGINEERING)
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