Interface-engineered Z-scheme of BiVO4/g-C3N4 photoanode for boosted photoelectrochemical water splitting and organic contaminant elimination under solar light
- Authors
- Mane, Pratik; Bae, Hyojung; Burungale, Vishal; Lee, Sang-Wha; Misra, Mrinmoy; Parbat, Harichandra; Kadam, Abhijit N.; Ha, Jun-Seok
- Issue Date
- Dec-2022
- Publisher
- PERGAMON-ELSEVIER SCIENCE LTD
- Keywords
- Bismuth vanadate; Photoelectrochemical water splitting; Water remediation; Z-scheme; Solar light
- Citation
- CHEMOSPHERE, v.308
- Journal Title
- CHEMOSPHERE
- Volume
- 308
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/85663
- DOI
- 10.1016/j.chemosphere.2022.136166
- ISSN
- 0045-6535
- Abstract
- Although n-type bismuth vanadate (BiVO4) is regarded as an attractive solar-light-active photoanode, its short carrier-diffusion length, sluggish oxidation kinetics, low electronic conductivity, and high recombination rate are the major intrinsic shortcomings that limit its practical application. To this end, the rational design of a solar -light-active, metal-free BiVO4-based Z-scheme heterojunction photoanode is of great significance for achieving effective charge-separation features and maximum light utilization as well as boosting redox activity for efficient environmental treatment and photoelectrochemical water splitting. Herein, we propose a facile approach for the decoration of metal-free graphitic carbon nitride (g-C3N4) nanosheets on BiVO4 to form a Z-scheme BiVO4/g-C3N4 photoanode with boosted photoelectrochemical (PEC) water splitting and rapid photoelectrocatalytic degradation of methyl orange (MO) dye under simulated solar light. The successful preparation of the Z-scheme BiVO4/g-C3N4 photoanode was confirmed by comprehensive structural, morphological, and optical analyses.Compared with the moderate photocurrent density of bare BiVO4 (0.39 mA cm(-2)), the Z-scheme BiVO4/g-C(3)N(4 )photoanode yields a notable photocurrent density of 1.14 mA cm(-2) at 1.23 V vs. RHE (-3-fold higher) with the promising long-term stability of 5 h without any significant photo-corrosion. Moreover, the PEC dye-degradation studies revealed that the Z-scheme BiVO4/g-C3N4 photoanode successfully degraded MO (?90%) in 75 min, signifying a 30% improvement over bare BiVO4. This research paves the way for rational interface engineering of solar-light-active BiVO4-based noble-metal-free Z-schemes for eco-friendly PEC water splitting and water remediation.
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