A Photoelectrochemical Device with Dynamic Interface Energetics: Understanding of Structural and Physical Specificities and Improvement of Performance and Stability
- Authors
- Jung, Jin-Young; Yu, Jin-Young; Yoon, Sanghwa; Yoo, Bongyoung; Lee, Jung-Ho
- Issue Date
- Dec-2018
- Publisher
- WILEY-V C H VERLAG GMBH
- Keywords
- electrocatalysts; hydrogen evolution reaction; interface energetics; photoelectrochemical cells; Si photocathodes
- Citation
- Advanced Sustainable Systems, v.2, no.12, pp.1 - 6
- Indexed
- SCOPUS
- Journal Title
- Advanced Sustainable Systems
- Volume
- 2
- Number
- 12
- Start Page
- 1
- End Page
- 6
- URI
- https://scholarworks.bwise.kr/erica/handle/2021.sw.erica/5071
- DOI
- 10.1002/adsu.201800083
- ISSN
- 2366-7486
- Abstract
- The basic configuration of a photoelectrochemical (PEC) water splitting device contains a semiconductor junction, which separates charge carriers by developing interface energetics. Recently, porous metal oxide/semiconductor junctions have shown that flat-band potentials (V-fb), representing interface energetics, could be dynamically changed with PEC reactions. However, it remains unclear as to what structural and physical specificities of the porous metal oxide induce the dynamic V-fb. Herein, it is demonstrated that the electrolyte permeability and nanocrystal structure of porous NiOx are crucial for the dynamic V-fb in porous NiOx integrated Si photocathodes. A comparison of the dense and porous NiOx with electrolyte impermeable and permeable features, respectively, shows that V-fb changes only in the porous NiOx. The porous NiOx also exhibits a nanocrystal structure and increased V-fb values with a decrease in nanocrystal size. As a result of the increased V-fb, the porous NiOx achieves much higher PEC performance compared to that of the dense NiOx. However, electrolyte permeability causes electrochemical decomposition of the Si component. Thus, a cointegration of the porous and dense NiOx bilayers, which ensures stable PEC operation for 10 h while achieving high potentials of 0.2 V versus reversible hydrogen electrode at a photocurrent of 10 mA cm(-2), is proposed.
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