期刊
CHEMOSPHERE
卷 308, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2022.136166
关键词
Bismuth vanadate; Photoelectrochemical water splitting; Water remediation; Z-scheme; Solar light
资金
- National Research Foundation of Korea (NRF) - Ministry of Education, Science and Technology [2018R1A6A1A03024334]
- Basic Science Research Capacity Enhancement Project through the Korea Basic Science Institute (National Research Facilities and Equipment Center) - Ministry of Education [2019R1A6C1010024]
In this study, a metal-free g-C3N4 nanosheet-decorated BiVO4 photoanode was successfully synthesized, leading to enhanced photoelectrochemical water splitting and dye degradation. The Z-scheme BiVO4/g-C3N4 photoanode exhibited higher photocurrent density and improved stability compared to bare BiVO4, demonstrating superior photoelectrocatalytic performance.
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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