Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV18)
Publication date: 21st February 2018
The optimum coupling of photoactive materials with catalytic or surface passivation layers remains one the key challenges to maximize the energy conversion efficiency in photoelectrochemical water splitting. Materials like BiVO4 have achieved promising efficiencies, which justifies the exploration of metal oxides as candidate materials for the production of solar fuels. During the last years, an extensive research activity targeting up-scalable water oxidation catalysts has been developed. One of the most promising materials reported to date is silver phosphate, Ag3PO4, which band gap value (2.45 eV) and valence band position (2.47 eV) make it suitable for light absorption and catalytic oxidation of water. In the present study, Ag3PO4 nanoparticles were electrodeposited on BiVO4 photoanodes and a remarkable water oxidation photocurrent of 2.3 mA cm-2 at 1.23 V vs RHE for the best device was obtained. This constitutes a notable increase compared to the pristine BiVO4 photoanode. From optical and electrochemical measurements, it was confirmed that a high fraction of the photogenerated carriers (between 50-70% in the best performing material) are successfully extracted for water oxidation. Photoelectrochemical experiments in the presence of a hole scavenger are consistent with the enhanced optical properties. Remarkably, the low charge injection efficiency of pristine BiVO4 (<20%) is boosted up to 90% (1-15 V vs RHE), in a 400 mV voltage window, highlighting the beneficial role of Ag3PO4 nanoparticles on the catalytic properties of the developed photoanode. It is demonstrated that the enhancement of optical density and the decrease of surface losses after the optimized deposition of Ag3PO4 nanoparticles is responsible for this notable performance. Remarkably, this heterostructure shows promising stability, demonstrating negligible loss of photocurrent after 20 hours continuous operation, due to the presence of metallic silver on the surface hindering self-reduction of Ag3PO4. This approach may open new avenues for technologically exploitable water oxidation photoanodes based on metal oxides.
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International Conference on Hybrid and Organic Photovoltaics
International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
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