Journal
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
Volume 904, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jelechem.2021.115933
Keywords
Bi@g-C3N4; Photoelectrocatalysis; Oxygen evolution reaction; Graphene oxide; Cocatalyst
Categories
Funding
- Ferdowsi University of Mashhad [2/50197]
Ask authors/readers for more resources
By loading GO on the surface of the photoanode, significant improvements in photoelectrocatalytic performance were achieved compared to Bi doping in the structure of the photocatalyst.
To enhance the solar photoelectrocatalytic water splitting, an effective photoanode was designed by electrophoretic depositing of graphene oxide (GO) on FTO/c-TiO2/Bi@g-C3N4. The photoelectrocatalytic performance of g-C3N4 was improved by Bi doping and GO loading as a cocatalyst on the surface of photoanode through the efficient charge cascade to increase an effective charge separation and reduce activation barriers for oxygen evolution reaction. The current-potential curve of Bi@g-C3N4/GO displayed about five and two times more photocurrent density (0.3 mA cm(-2) at 1.23 V vs RHE) with respect to those of g-C3N4 and Bi@g-C3N4, following with a 110 and 80 mV cathodically shifted onset potential, respectively. The conduction band edge was calculated using the flat band potential of the photocatalysts which was estimated by Butler-Gartner model. GO loading leads to yield the photo-voltage of 176 mV compared with 81 and 113 mV for g-C3N4 and Bi@g-C3N4, respectively. The optimum of thickness of GO cocatalyst was 0.9 mu m. If the thickness exceeds this optimum value, the recombination centers increase and active sites of photocatalytic layer are blocked. The charge separation and injection efficiency for Bi@g-C3N4/GO photoanode were determined by using H2O2 as an effective hole scavenger. Among fabricated electrodes, Bi@g-C3N4/GO electrode represented the lowest charge transfer resistance. The results showed that much improvement in photoelectrocatalytic per-formance was achieved by GO loading on the surface of photoanode with respect to Bi doping in the structure of photocatalyst.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available