Oxygen vacancies activating surface reactivity to favor charge separation and transfer in nanoporous BiVO4 photoanodes

Jin, Sen; Ma, Xiumei; Pan, Jing; Chen, Zhu; Saji, Sandra Elizabeth; Hu, Jingguo; Xu, Xiaoyong; Sun, Litao; Yin, Zongyou

doi:10.1016/j.apcatb.2020.119477

Cited by 145 publications

(88 citation statements)

References 43 publications

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“…For instance, the excessive doping or generation of excessive O 2 vacancies (O v )/surface defects may affect the semiconducting properties of BiVO 4 . [56] Moreover, surface defects may also act as recombination centres, leading to the decreased performances of the BiVO 4 photoanode.…”

Section: Different Surface Bulk and Interface Engineering Strategiesmentioning

confidence: 99%

“…Jin and co-workers used the facile Ar-plasma etching technique to synthesize nanostructured porous BiVO 4 photoelectrodes with controllable surface O v . [56] When the reaction between Ar-plasma and BiVO 4 sample takes place, chemical bonds are destroyed with the charge imbalance and crystal-deficient shell is retained. Fascinatingly, the relative intensity of O v peak increased significantly in plasma-treated samples, which contributed to the proliferation of surface O v (Figure 7j).…”

Section: Defect Engineeringmentioning

confidence: 99%

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Emerging Surface, Bulk, and Interface Engineering Strategies on BiVO₄ for Photoelectrochemical Water Splitting

Gaikwad

Suryawanshi

Ghorpade

et al. 2021

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Therefore, an ever-growing demand for sustainable and environmentally-friendly energy technologies are prompting scientists to explore alternative approaches to reduce the carbon footprint. [2] Among the different sustainable energy sources, solar energy is an inexhaustible source of energy (173000 Terawatt (TW), almost 10 000 times of 17.7 TW, global energy consumption in 2020) and the largest currently available on earth with a ubiquitous distribution worldwide. [3] However, its decentralized and intermittent nature poses a great challenge to our energy needs. [4] Artificial photosynthesis, imitating a natural photosynthesis, where the harvesting of sunlight directly into chemical bonds (hydrogen, (H 2 ) fuel) is a highly promising approach to address the serious issue like air pollution, greenhouse gas emission, etc. Artificial photosynthesis by means of photoelectrochemical (PEC) water splitting has been studied extensively to split water using sunlight and semiconductor into oxygen (O 2 ) and H 2 , where the generated H 2 can be stored and transported to other energy conversion systems. [5] In recent years, PEC water splitting turned out to be an elegant and ecological way to generate clean H 2 fuel. Despite having mature and commercialized technologies, photovoltaic-electrochemical (PV-EC) water splitting systems have the most significant complications in PV designs. [6] In a photocatalytic (PC) water splitting system, on the other hand, both H 2 and O 2 are generated on the same surface of the PC particles, and hence in most cases, backward complex reactions like hydrogen oxidation reaction and oxygen reduction reaction occur quickly, lowering the solar to H 2 (STH) conversion efficiency. [7] In comparison to the PC system, the physical separation of oxidation and reduction species in PEC cells makes them more practical, effective, and safer. Moreover, the PEC cells have an electrode/electrolyte interface that performs simultaneous roles of light-harvesting and electrolysis in a single reactor. Consequently, the large-scale application of PEC cells is the most achievable, even at lower operating temperature as it opens up the opportunity to improve efficiency and reduce costs through the nature of its device structure. In particular, a recent assessment of its practicability has shown that the lifespan (i.e., stability), efficiency, and capital cost of The photoelectrochemical (PEC) cell that collects and stores abundant sunlight to hydrogen fuel promises a clean and renewable pathway for future energy needs and challenges. Monoclinic bismuth vanadate (BiVO 4 ), having an earthabundancy, nontoxicity, suitable optical absorption, and an ideal n-type band position, has been in the limelight for decades. BiVO 4 is a potential photoanode candidate due to its favorable outstanding features like moderate bandgap, visible light activity, better chemical stability, and cost-effective synthesis methods. However, BiVO 4 suffers from rapid recombination of photogenerated charge carriers that have impeded further imp...

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Section: Different Surface Bulk and Interface Engineering Strategiesmentioning

confidence: 99%

Section: Defect Engineeringmentioning

confidence: 99%

Emerging Surface, Bulk, and Interface Engineering Strategies on BiVO₄ for Photoelectrochemical Water Splitting

Gaikwad

Suryawanshi

Ghorpade

et al. 2021

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118

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“…The surface oxygen vacancy defects facilitate the effective separation of photogenerated carriers, 88,89 and as they trap oxygen from water and make the O-H bond of the H 2 O molecule weaker. 53,62,90,91 As for the added Na 2 S and Na 2 SO 3 , they not only avoid the photocorrosion of sulde but also go through eqn ( 3)-( 7 arose, and the DMPO-cO 2 À characteristic peaks of MoCoOS-2 are higher than those of Co(O,S), which indicates that MoCoOS-2 produces more cO 2 À radicals under illumination (Fig. 14b).…”

Section: Mechanism Of Hydrogen Evolutionmentioning

confidence: 97%

“…From previous studies, it was found that oxygen vacancies can reduce the band gap by forming a defect state below the conduction band or act as photogenerated electron capture centers, thereby inhibiting electron-hole recombination, promoting the transfer of electrons trapped at the defect sites, and improving the catalytic efficiency. 53,[72][73][74] Fig. 2 shows the X-ray diffraction pattern of MoCoOS.…”

Section: Structure Analysismentioning

confidence: 99%

A molybdenum sulfo-oxide/cobalt oxysulfide Z-scheme heterojunction catalyst for efficient photocatalytic hydrogen production and pollutant reduction

Abdeta

Zhang

et al. 2022

J. Mater. Chem. A

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“…Thanks to the SEM images, the BiOI layer was observed as very thin 2D plate-like nanosheets vertically attached to the FTO substrate (Figure 3a). After the chemical and thermal treatments, the nanosheets were converted to a column-like morphology formed by rounded particles of BiVO4, as shown in Figure 3b [45]. Figure 3c shows the morphology of a successfully synthesized BiVO4/CdS heterostructure, highlighting that CdS was uniformly deposited onto the BiVO4 surface.…”

Section: Fabrication and Characterization Of Bivo4-based Photoanodesmentioning

confidence: 97%

Nanoscale Assembly of BiVO4/CdS/CoOx Core–Shell Heterojunction for Enhanced Photoelectrochemical Water Splitting

et al. 2021

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Porous BiVO4 electrodes were conformally decorated with CdS via a chemical bath deposition process. The highest photocurrent at 1.1 V vs. RHE was achieved for a BiVO4/CdS composite (4.54 mA cm−2), compared with CdS (1.19 mA cm−2) and bare BiVO4 (2.1 mA cm−2), under AM 1.5G illumination. This improvement in the photoefficiency can be ascribed to both the enhanced optical absorption properties and the charge separation due to the heterojunction formation between BiVO4 and CdS. Furthermore, the BiVO4/CdS photoanode was protected with a CoOx layer to substantially increase the photostability of the material. The new BiVO4/CdS/CoOx nanostructure exhibited a highly stable photocurrent density of ~5 mA cm−2. The capability to produce O2 was locally investigated by scanning photoelectrochemical microscope, which showed a good agreement between photocurrent and O2 reduction current maps. This work develops an efficient route to improve the photo-electrochemical performance of BiVO4 and its long-term stability.

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Oxygen vacancies activating surface reactivity to favor charge separation and transfer in nanoporous BiVO4 photoanodes

Cited by 145 publications

References 43 publications

Emerging Surface, Bulk, and Interface Engineering Strategies on BiVO₄ for Photoelectrochemical Water Splitting

Emerging Surface, Bulk, and Interface Engineering Strategies on BiVO₄ for Photoelectrochemical Water Splitting

A molybdenum sulfo-oxide/cobalt oxysulfide Z-scheme heterojunction catalyst for efficient photocatalytic hydrogen production and pollutant reduction

Nanoscale Assembly of BiVO4/CdS/CoOx Core–Shell Heterojunction for Enhanced Photoelectrochemical Water Splitting

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Oxygen vacancies activating surface reactivity to favor charge separation and transfer in nanoporous BiVO4 photoanodes

Cited by 145 publications

References 43 publications

Emerging Surface, Bulk, and Interface Engineering Strategies on BiVO4 for Photoelectrochemical Water Splitting

Emerging Surface, Bulk, and Interface Engineering Strategies on BiVO4 for Photoelectrochemical Water Splitting

A molybdenum sulfo-oxide/cobalt oxysulfide Z-scheme heterojunction catalyst for efficient photocatalytic hydrogen production and pollutant reduction

Nanoscale Assembly of BiVO4/CdS/CoOx Core–Shell Heterojunction for Enhanced Photoelectrochemical Water Splitting

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Emerging Surface, Bulk, and Interface Engineering Strategies on BiVO₄ for Photoelectrochemical Water Splitting

Emerging Surface, Bulk, and Interface Engineering Strategies on BiVO₄ for Photoelectrochemical Water Splitting