Solution ‐ based synthesis of Earth-abundant materials for photoelectrochemical solar fuel production Yi-Hsuan Lai National Cheng Kung University, Chinese Taipei Photoelectrochemical (PEC) solar fuel production has driven lots of attention in view of addressing climate change and the global energy crisis. Owing to the flexibility, scalability and cost-effectiveness, solution-based synthesis was applied in our research for synthesising effective photoelectrodes made of earth-abundant materials for solar fuel production. In the first study, a nanostructured Bi 4 O 5 I 2 electrode was prepared by a facile solvothermal process. The Bi 4 O 5 I 2 electrode can be readily converted to a CuBi 2 O 4 photocathode and the BiVO 4 photoanode by a solution conversion method followed by pairing the photoelectrodes in tandem for solar water splitting. [1] In the second work, a copper-incorporated BiVO 4 was synthesised by electrodeposition of BIOI on a conductive substrate followed by solution conversion and heat treatment. [2] The copper incorporation enhanced the efficiencies of charge separation and the interfacial charge transfer of BiVO 4 , which is evident from PEC analyses and electrochemical impedance spectroscopy. Recently, we also demonstrated that an exfoliated V 2 O 5 electrode can be prepared by a simple and facile solution-based synthesis. [3] The exfoliated V 2 O 5 was firstly prepared by a drop-casting process followed by heat treatments and liquid exfoliation. The exfoliated V 2 O 5 has significantly higher oxygen vacancies and better performance for PEC methanol oxidation than the non-exfoliated one. References
1. Y.-H. Lai, K.-C. Lin, C.-Y. Yen and B.-J. Jiang, Faraday Discuss., 2019, 215, 297. 2. T.-R. Ko, Y.-C. Chueh, Y.-H. Lai, C.-Y. Lin, J. Taiwan Inst. Chem. Eng., 2020, 111, 80. 3. T.-R. Ko, C.-Y. Lin, and Y.-H. Lai., Chem. Eng. J., 2022, 433, 133607.
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