Journal
ACS APPLIED ENERGY MATERIALS
Volume 5, Issue 12, Pages 14891-14900Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.2c02362
Keywords
photoelectrochemical water splitting; BiVO4; hole storage; hole blocking; charge transport
Funding
- Defence Research and Development Organisation ( DRDO), ER IPR, India [ERIP/ ER/ 202110001/M01/1788]
- National Research Foundation of Korea (NRF) - Korean Government [2020R1A4A1017737, 2022R1A2C3003081]
- National Research Foundation of Korea [2022R1A2C3003081] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Researchers demonstrated the role of SnO2 hierarchical microspheres and ferrihydrite nanosheets as hole-blocking and hole-storage layers for efficient water oxidation by BiVO4 photoanodes. The optimized SnO2@BiVO4/FN photoanodes exhibited remarkable photocurrent density at 1.23 V versus RHE with excellent stability.
Solar-driven water splitting using a photoelectro-chemical (PEC) mechanism is of great practical interest for developing renewable energy systems. In general, BiVO4 photo-anodes are considered to be a promising candidate for efficient PEC solar energy conversion. However, their solar energy conversion performance is negatively affected by the high recombination rate of electron-hole pairs. Despite the develop-ment of numerous techniques, combined attempts to engineer both hole-blocking (bottom) and hole-storage (top) interfaces in BiVO4 photoanodes are still lacking. Here, we demonstrate the role of SnO2 hierarchical microspheres and ferrihydrite nanosheets as hole-blocking and hole-storage layers for efficient water oxidation by BiVO4 photoanodes. Furthermore, the key contributions of the size of the SnO2 hierarchical microspheres and the thicknesses of the BiVO4 and FN layers, as well as the role of the active area for illumination, are studied through several analytical techniques. The optimized SnO2@BiVO4/FN photoanodes exhibited a remarkable photocurrent density of 3.28 +/- 0.2 mA/cm2 at 1.23 V versus RHE, along with excellent stability (10 h). Overall, the results demonstrate that the proposed fabrication method represents a substantial advancement in the development of affordable water splitting cells.
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