Light-driven water oxidation by a BiVO/TiO photoanode modified with D102 organic dye and copper() meso-tetra(4-carboxyphenyl)porphyrin

• Published in: Sustainable energy & fuels 2024-12, Vol.8 (24), p.5927-5936
• Main Authors: Mauliana, Andi, Syauqi, Muhammad Iqbal, Akbar, Zico Alaia, Pratomo, Uji, Mulyana, Jacob Yan, Ivandini, Tribidasari A
• Format: Article
• ISSN: 2398-4902
• DOI: 10.1039/d4se00543k

To improve its photoelectrocatalytic water oxidation properties, the BiVO 4 photoanode was integrated with TiO 2 modified by Indoline D102 dye and copper( ii ) meso-tetra(4-carboxyphenyl)porphyrin (CuTCPP). The dye was used as a redox mediator, whereas CuTCPP served as a co-catalyst for light-driven water oxidation. The systematic modifications on photoanodes were meticulously characterized by SEM, XRD, UV-Vis spectrometry, and potentiostatic analyses. Modification of the BiVO 4 photoanode with TiO 2 followed by D102 and CuTCPP (BiVO 4 /TiO 2 /D102-CuTCPP) demonstrates a remarkable improvement in photoelectrocatalytic water oxidation properties compared to those of the unmodified BiVO 4 film. An increase of power density up to 20 fold was observed under 100 mW cm −2 light irradiation at a bias potential of 1.27 V RHE . The system also demonstrated good stability, with a photocurrent retention of around 97% of the initial photocurrent over a 20 minutes period and retaining 69% of its initial value after 2 hours of continuous operation. Furthermore, the photoelectrocatalytic water splitting exhibited a high faradaic efficiency of oxygen evolution at approximately 97%. These excellent performances were attributed to the synergy of dye and co-catalyst co-assembly by forming a cascade hole transfer mechanism which improves the water oxidation kinetics and reduces the electron-hole recombination rate of BiVO 4 in the photoanode system. To improve its photoelectrocatalytic water oxidation properties, a BiVO 4 photoanode was integrated with TiO 2 modified by Indoline D102 dye and copper( ii ) meso-tetra(4-carboxyphenyl)porphyrin (CuTCPP).