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Hydrogel protection strategy to stabilize water-splitting photoelectrodes

Authors
JEIWAN TANByungJun KangKyungmin KimDONYOUNG KANGHyungsoo Leesunihl magyumin JangHyungsuk LeeJoo Ho Moon
Issue Date
Jun-2022
Publisher
Nature Publishing Group
Keywords
Artificial photosynthesis; Hydrogen fuel; Photocatalysis
Citation
Nature Energy, v.7, no.6, pp.537 - 547
Journal Title
Nature Energy
Volume
7
Number
6
Start Page
537
End Page
547
URI
https://yscholarhub.yonsei.ac.kr/handle/2021.sw.yonsei/6301
DOI
10.1038/s41560-022-01042-5
ISSN
2058-7546
Abstract
Photoelectrochemical water splitting is an attractive solar-to-hydrogen pathway. However, the lifetime of photoelectrochemical devices is hampered by severe photocorrosion of semiconductors and instability of co-catalysts. Here we report a strategy for stabilizing photoelectrochemical devices that use a polyacrylamide hydrogel as a highly permeable and transparent device-on-top protector. A hydrogel-protected Sb2Se3 photocathode exhibits stability over 100?h, maintaining ~70% of the initial photocurrent, and the degradation rate gradually decreases to the saturation level. The structural stability of a Pt/TiO2/Sb2Se3 photocathode remains unchanged beyond this duration, and effective bubble escape is ensured through the micro gas tunnel formed in the hydrogel to achieve a mechanically stable protector. We demonstrate the versatility of the device-on-top hydrogel protector under a wide electrolyte pH range and by using a SnS photocathode and a BiVO4 photoanode with ~500?h of lifetime.
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College of Engineering > Mechanical Engineering > 1. Journal Articles
College of Engineering > 공과대학 신소재공학과 > 1. Journal Articles

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