For efficient photoelectrochemical (PEC) water oxidation, tailorable modification of photoanodes with various functional layers is inevitably required to address the inherent limitations of the photoanodes. In this study, we report that N-doped graphene quantum dots derived from natural polyphenol tannic acid (N-TAGQDs) can form ultrathin and stable layers on a BiVO4photoanode together with Co2+ions (BiVO4/Co/N-TAGQD) by a simple dipping method and significantly improve PEC water-oxidation performance. A series of systematic analyses suggest the synergistic effect of graphitization of precursors to N-TAGQDs, N-doping, and the presence of phenolic groups to impart multifunctional roles of improving charge separation, hole storage, and catalytic activity. We believe that this simple method provides insights for the development of novel photoanodes and design of versatile carbon nanomaterials.
Bibliographical noteFunding Information:
This work was supported by the Basic Science Research Program (2021R1A2C2013684), the Technology Development Program to Solve Climate Changes (2019M1A2A2065616) and the Nano-Material Technology Development Program (2017M3A7B4052798, 2017M3A7B4052802, and 2021M3H4A1A03051390) through the National Research Foundation of Korea (NRF) funded by the Ministry of Science and ICT or Korea. This study was also supported by the Basic Science Research Programs (2018R1D1A1A02046918, 2020R1I1A1A01057924, and 2020R1A6A3A13077458) through the NRF funded by the Ministry of Education of Korea.
© The Royal Society of Chemistry 2021.
All Science Journal Classification (ASJC) codes
- Renewable Energy, Sustainability and the Environment
- Materials Science(all)