Synergetic effect of bismuth vanadate over copolymerized carbon nitride composites for highly efficient photocatalytic H2 and O2 generation

• Published in: Journal of colloid and interface science Vol. 627; pp. 621 - 629
• Main Authors: Hayat, Asif, Sohail, Muhammad, Taha, T.A., Kumar Baburao Mane, Sunil, Al-Sehemi, Abdullah G., Al-Ghamdi, Ahmed A., Nawawi, W.I., Palamanit, Arkom, Amin, Mohammed A., Fallatah, Ahmed M., Ajmal, Zeeshan, Ali, Hamid, Ullah Khan, Wasim, Wajid Shah, Muhammad, Khan, Javid, Wageh, S.
• Format: Journal Article
• Language: English
• Published: Elsevier Inc 01.12.2022
• Subjects: Bismuth vanadate; Carbon nitride; Heterojunction; Overall water splitting; Quinolinic acid; Bismuth vanadate; Quinolinic acid; Overall water splitting; Carbon nitride; Heterojunction
• ISSN: 0021-9797; 1095-7103
• DOI: 10.1016/j.jcis.2022.07.012

Proposed mechanism of BiVO4/CN-QA. [Display omitted] •Quinolinic acid(QA)doped g-CN(CN-QA) was developed via facile thermalapproach.•Different samples of BiVO4/CN-QA with high stability were prepared via hydrothermal method.•Remarkable enhanced photocatalytic H2and O2 evolution was achieved using these catalysts via overall water splitting.•A dual synergeticmechanism on BiVO4/CN-QA has been proposed. The development of copolymerized carbon nitride (CN)-based photocatalysts may support advances in photocatalytic overall water splitting. However, the recombination of charge carriers is the main bottleneck that reduces its overall photocatalytic activity. To overcome this problem, the construction of heterojunction technology has emerged as an effective approach to reduce the charge carrier recombination, thereby improving charge separation and transport efficiency. In this work, an innovative heterojunction was prepared between Quinolinic acid (QA) modified CN (CN-QAx) and novel nanorod-shaped bismuth vanadate (BiVO4) (BiVO4/CN-QAx) for overall water splitting through a simple in-situ solvent evaporation technique. The obtained results show that the synthesized samples have efficient and improved activities for releasing H2 (862.1 μmol/h) and O2 (31.58 μmol/h) under visible light irradiation. Furthermore, an exceptional apparent quantum yield (AQY) of 64.52 % has been recorded for BiVO4/CN-QA7.0 at 420 nm, which might be due to the substantial isolation of photoinducedcharge carriers. Therefore, this work opens up a new channel toward efficient CN-based photocatalysts in the sustainable energy production processes.