Hydrogel protection strategy to stabilize water-splitting photoelectrodes
- Authors
- JEIWAN TAN; ByungJun Kang; Kyungmin Kim; 강돈영; Hyungsoo Lee; sunihl ma; gyumin Jang; Hyungsuk Lee; Joo 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
- Pages
- 11
- 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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Collections - College of Engineering > Mechanical Engineering > 1. Journal Articles

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