Achieving the spontaneous evolution of hydrogen from photoelectrochemical (PEC) cells in water using solar light is a desirable but difficult goal. Here, we report a highly efficient wireless monolithic tandem device composed of bipolar highly transparent BiVO4-sensitised mesoporous WO3 films/Pt and a porphyrin-dye-based photoelectrode achieving 5.7% without any external bias. A sandwich infiltration process was used to produce a thin BiVO4 layer coated onto mesoporous WO3 films while preserving high transparency, enabling high photonic flux into the second dye-sensitised photoanode. In addition, the porphyrin-dye-sensitised photoanode with a cobalt electrolyte generated sufficient bias, realising highly efficient unassisted solar water splitting in the tandem cells. By combining the highly transparent BiVO4-sensitised mesoporous WO3 films with the state-of-the-art water oxidation catalyst and a single dye-sensitised solar cell with a high open circuit potential in a monolithic tandem configuration, an extraordinarily high solar-to-hydrogen (STH) conversion efficiency with spontaneous hydrogen evolution was obtained.
Bibliographical noteFunding Information:
This work was supported by the NRF of Korea Grant funded by the Ministry of Science, ICT and Future Planning ( NRF-2013R1A2A1A09014038 ).
Jeong Kwon is currently a Ph.D. candidate under the supervision of Prof. Jong Hyeok Park at the School of chemical engineering, Sungkyunkwan University (SKKU), Republic of Korea. He is also a researcher in the institute of science and technology at Sungkyunkwan University. He received his master degree under the supervision of the same professor in 2013. He has been granted the Global Ph.D. Fellowship program by NRF of Korea since 2013. His research focuses on the high efficient dye-sensitized solar cells and organic–inorganic hybrid based perovskite solar cells with tailored organic and inorganic nanostructures.
Jung Kyu Kim is currently a Ph.D. candidate under the supervision of Prof. Jong Hyeok Park at SKKU Advanced Institute of Nano-technology (SAINT) and school of chemical engineering, Sungkyunkwan University, Korea. He is also a researcher in the institute of science and technology at Sungkyunkwan University. He has been granted the Global Ph.D. Fellowship program by NRF of Korea since 2012. His research focuses on the efficient heterojunction light harvesting devices with tailored nanostructures; including the organic based or the organic–inorganic hybrid based heterojunction solar cells, and solar-to-hydrogen conversion devices.
All Science Journal Classification (ASJC) codes
- Renewable Energy, Sustainability and the Environment
- Materials Science(all)
- Electrical and Electronic Engineering