Water Splitting Progress in Tandem Devices: Moving Photolysis beyond Electrolysis |
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Authors: | Kan Zhang Ming Ma Ping Li Dong Hwan Wang Jong Hyeok Park |
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Institution: | 1. Department of Chemical and Biomolecular Engineering, Yonsei University, Seodaemun‐gu, Seoul, Republic of Korea;2. SKKU Advanced Institute of Nanotechnology, Sungkyunkwan University, Suwon, Republic of Korea;3. School of Integrative Engineering, Chung‐Ang University, Dongjak‐gu, Seoul, Republic of Korea |
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Abstract: | Water photolysis is a sustainable technology to convert natural solar energy and water into chemical fuels and is thus considered a thorough solution to the forthcoming energy crises. Unassisted water splitting that could directly harvest solar light and subsequently split water in a single device has become an important research theme. Three types of tandem devices including photoelectrochemical (PEC), photovoltaic (PV) cell/PEC and PV/electrolyser tandem cells are proposed to realize water photolysis at different levels of integration and component. Recent progress in tandem water splitting devices is summarized, and crucial issues on device optimization from the perspective of each photo‐absorber functionalities in band edge potential, light absorptivity and transmittance are discussed. By increasing the performances of stand‐alone PEC or PV devices, a 20% solar to hydrogen efficiency is predicted that is a significant value towards further application in practice. Accordingly, the challenges for materials development and configuration optimization are further outlined. |
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Keywords: | water splitting tandem devices light harvesting solar to hydrogen efficiency |
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