APPLIED SURFACE SCIENCE
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2021
·
IF 6.707
Yahui Li,Shuo Li,Yun Wu,Juan Zhang,YiYi Yang,Hui Mao,Yu Zhang,Xi-ming Song
Illuminating the charge transport at photoanode-electrolyte interface is pivotal for optimizing photoelectrochemical (PEC) water oxidation performance of BiVO 4 . Our study demonstrates a preferentially photogenerated electrons trapping process at BiVO 4 surface, followed by the formation of surface-bound excitons. A facile LSV treatment method is described, which remarkably passivate the surface electron trapping states by the formation surface oxygen vacancies. The surface oxygen vacancies could “free” the photogenerated holes from the surface-bound excitons. As a result, more photogenerated holes are available on BiVO 4 surface and the PEC performance is enhanced.
研究领域:
材料科学
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能源科学
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DOI
高影响因子
Catalysts
·
2021
·Vol. 11
·期 4
·489
·
IF 4.146
Hongchen Song,Jing Sun,Tingting Shen,Lang Deng,Xikui Wang
The increasing concentration of residual ciprofloxacin (CIP) can cause potential harm to the environment. Photocatalysis has been regarded as an effective method for the degradation of CIP. Bi/BiVO4with excellent photocatalytic performance was synthesized partial reduction with NaBH4. The structure, morphology, composition, and optical performance of BiVO4and Bi/BiVO4were characterized by a variety of techniques. The results showed that the Bi/BiVO4exhibits high photocatalytic activity in the degradation of CIP. Comparison of BiVO4and Bi/BiVO4has lower photoluminescence intensity and higher photocurrent responses intensity. The introduction of Bi made Bi/BiVO4have a higher charge separation efficiency and generate more active free radicals. In addition, the radical trapping experiments revealed that superoxide free radicals and holes were the main active free radicals during the degradation of CIP. The pathway of CIP degradation was investigated through high performance liquid chromatography-mass spectrometry, and a possible degradation mechanism was proposed.Keywords:BiVO4;bismuth;photocatalysis;CIP
研究领域:
环境科学
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材料科学
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化学工程
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Yin Hu,Wei Chen,Jianping Fu,Mingwei Ba,Fuqian Sun,Peng Zhang,Jiyong Zou
Benzene is currently recognized as one of the most toxic contaminants. Our previously published study revealed that BiVO 4 /TiO 2 is an excellent photocatalyst toward the degradation of benzene. Herein, BiVO 4 /TiO 2 has been synthesized via a sol-gel method and a facile hydrothermal route by adjusting the precursor hydrolysis rate with the use of different acids (CH 3 COOH, HNO 3 and H 2 SO 4 ). The influence of these acids on the physicochemical characteristics and photocatalytic performance is discussed in detail. X-ray diffraction and N 2 sorption analyses confirm that acid has an important effect on the crystalline composition and BET specific surface area. BiVO 4 /TiO 2 synthesized in CH 3 COOH has better photocatalytic activity for the degradation of gaseous benzene than that in HNO 3 and H 2 SO 4 under visible light irradiation. Results of XPS measurement demonstrate that the hydroxyl group in BiVO 4 /TiO 2 -CH 3 COOH is more abundant than that in BiVO 4 /TiO 2 -HNO 3 and BiVO 4 /TiO 2 -H 2 SO 4 . The photocurrent signal is investigated by electrochemical measurement, which indicates that more effective separation of photogenerated carriers occurs in the BiVO 4 /TiO 2 /CH 3 COOH system. It is hoped that our work can offer valuable information on the design of TiO 2 composites with enhanced properties.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Yang Zhang,Xintong Zhang,Dan Wang,Fangxu Wan,Yichun Liu
Introducing appropriate amount of oxygen vacancies by hydrogenation treatment is a simple and efficient way to improve the photoelectrochemical performance of nanostructured oxide photoanodes. However, the hydrogenation effect is often not durable due to the gradual healing of oxygen vacancies at or close to surface of photoanodes. Herein, we tackled the problem by conformal coating the hydrogenated nanoporous BiVO 4 (H-BiVO 4 ) photoanode with an ultrathin layer of amorphous TiO 2 . Photoelectrochemical measurements showed that a 4 nm-thick TiO 2 layer could significantly improve the stability of H-BiVO 4 photoanode for repeated working test, with negligible influence on the initial photocurrent compared to the uncoated one. Mott–Schottky and linear sweep voltammetry measurements showed that donor density and photocurrent density of the H-BiVO 4 electrode almost decayed to the values of pristine BiVO 4 electrode after 3 h test, while the amorphous TiO 2 -coated electrode only degraded by 6% and 5% of the initial values respectively in the same period. The investigation thus suggested that the amorphous TiO 2 layer did protect the oxygen vacancies in H-BiVO 4 photoanode by isolating these oxygen vacancies from environmental oxygen, while at the same time not impeding the interfacial charge transfer to water molecules due to its leaky nature.
研究领域:
材料科学
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能源科学
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产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
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2022
·
IF 7.968
Haiyang Fan,Guiyun Yi,Zhengting Zhang,Xiuxiu Zhang,Peng Li,Chuanxiang Zhang,Lunjian Chen,Yulong Zhang,Qi Sun
Herein, we successfully fabricated the Ag deposited BiVO 4 (ABVO) electrode via the combination of electrodeposition and photodeposition for efficient photoelectrocatalytic degradation of β-naphthol under visible-light illumination (λ > 420 nm). The photocurrent density of ABVO photoanode was around 1.6 times higher than that of BiVO 4 (BVO) under visible-light irradiation at 1.5 V vs. Ag/AgCl, which was ascribed to the reduced recombination rate of photoinduced electron-hole pairs, as confirmed by electrochemical impedance spectroscopy (EIS) and Mott-Schottky plots. Additionally, the photoelectrocatalytic (PEC) degradation rate of β-naphthol (10 mg L −1 , 300 mL) by ABVO could approximately reach 80%, whose corresponding kinetic constant was 1.56 times higher than BVO. Based on the radical quenching experiments and EPR results, the •OH and •O 2 - radicals played crucial roles in PEC degradation of β-naphthol. The enhanced PEC performance of ABVO can be ascribed to the synergy of photocatalysis , electrocatalysis and the localized surface plasmon resonance (LSPR) effect of deposited Ag particles, which can effectively suppress the recombination of photoinduced electron-hole pairs, thereby prolonging the photo-excited charges lifespans and promoting the PEC performance. Furthermore, the ABVO photoanode possesses excellent recyclability , outstanding stability and strong resistance to acid and alkali, which can be a promising candidate for PEC organic contaminants degradation.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
RSC Advances
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2014
·Vol. 5
·期 5
·3767-3773
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IF 3.708
Chade Lv,Gang Chen,Jingxue Sun,Chunshuang Yan,Hongjun Dong,Chunmei Li
In this work, we design and successfully fabricate novel Bi2O3 quantum dot (QD)-decorated BiVO4 nanofibers by a direct heat treatment of as-spun fibers. The Bi2O3 QDs with a size of 5–15 nm are well dispersed on the surface of the BiVO4 nanofibers with a diameter of 400–700 nm to form a Bi2O3 QD-decorated BiVO4 nanofiber photocatalyst. Based on the phase separation mechanism and the properties of solvents, a possible formation process of the Bi2O3 QD-decorated BiVO4 nanofibers has been proposed. The BiVO4 nanofibers decorated with Bi2O3 QDs exhibit much better photocatalytic performance than pure BiVO4 nanofibers. Photocurrent responses and electrochemical impedance spectra prove that decorating BiVO4 nanofibers with very small Bi2O3 QDs can effectively promote the separation of photoinduced carriers, which is beneficial for photocatalytic properties. More significantly, this work is relevant to environmental purification and photoelectrochemistry.
研究领域:
材料科学
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环境科学
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光电化学
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DOI
高影响因子
ELECTROCHIMICA ACTA
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2021
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IF 6.901
Xianqiang Xiong,Chuanqun Zhang,Xiao Zhang,Liya Fan,Lujia Zhou,Yuxiao Chu,Weiya Huang,Chenglin Wu,JiangShan Li,Xiaogang Yang,Deman Han
Nanoporous BiVO 4 is a promising photoanode material for driving the photoelectrochemical (PEC) water splitting to hydrogen energy, whereas its performance is limited by the sluggish surface catalysis reaction. Herein, a facile citrate-assisted method was developed for growing uniform amorphous FeOOH overlayer on nanoporous BiVO 4 , which significantly improved the water oxidation kinetics and resulted in a remarkable photocurrent density of 3.33 mA cm −2 at 1.23 V (vs. RHE). The activity enhancement was even superior to the well-crystallized α-FeOOH and β-FeOOH modified BiVO 4 . The citrate serves as the bridging agent that not only optimizes the BiVO 4 /FeOOH interface facilitating the hole trapping/transport, but also inhibits the particle growth of FeOOH nanolayer and provides more oxygen vacancies to promote the water oxidation. We demonstrate that the uniform FeOOH overlayer acts as the hole storage layer and catalyst, which increases the potential drop in the Helmholtz layer and greatly facilitates the interfacial hole transfer. Moreover, the citrate-assisted modification method was proved to be a general strategy to improve the PEC performance of TiO 2 and α-Fe 2 O 3 photoanodes. Our work provides a simple and effective design strategy for constructing uniform semiconductor/electrocatalysts interface that can realize efficient solar-to-hydrogen conversion.
研究领域:
材料科学
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能源转换与储存
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2021
·
IF 5.316
Jiangshan Li,Yuxiao Chu,Chuanqun Zhang,Xiao Zhang,Chenqi Wu,Xianqiang Xiong,Lujia Zhou,Chenglin Wu,Deman Han
The development of efficient photocathodic protection system requires highly active and robust light-absorbing electrodes for promoting the electron transfer from the light-absorber to the protected metal. Herein, we present an extremely active and stable CoFe prussian blue (CoFe-PB) modified BiVO 4 film prepared by sequentially dipping the BiVO 4 film in K 3 [Fe(CN) 6 ] and CoCl 2 solution, which can realize the long-term protection of 304 stainless steel under simulated solar illumination. Particularly, the photocathodic protection process can be operated in a scavenger-free environment. Our mechanism studies reveal that the CoFe-PB overlayer acts as the hole storage layer which can effective extract the photo-generated holes from the BiVO 4 photoanode, and meanwhile works as an efficient catalyst that overcome the slow water oxidation barrier at the electrode/liquid interface, and thus greatly increase the electron lifetime, thereby enhancing the photocathodic protection capability. Our work provides a rather simple and effective design strategy for constructing semiconductor/electrocatalysts system for the underlying photogenerated cathodic protection application.
研究领域:
材料科学
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电化学
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光催化
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2019
·
IF 3.372
Fang Li,Dennis Y.C. Leung
A heterojunction structure of BiVO 4 coupled with a narrow bandgap photocatalyst Bi 2 S 3 was fabricated forming a composite material with strong capacity in visible light absorption and enhancement in the separation rate of photogenerated charge carriers owing to their suitable band structures. As a result, efficiency of hydrogen production through photoelectrocatalysis is highly enhanced. The morphology and composition of as-prepared sample electrodes are measured through X-Ray Diffraction (XRD), scanning electron microscopy (SEM), high resolution transmission electron microscopy (HR-TEM) and X-ray photoelectron spectroscopy (XPS). The performance of the hybrid nanostructure Bi 2 S 3 /BiVO 4 photoelectrode was found to be related to the growing process of Bi 2 S 3 nanowire during the hydrothermal preparation process. The composited Bi 2 S 3 /BiVO 4 photoanode achieved a photoconversion efficiency of 2.9% which is nearly 3-fold that of the bare BiVO 4 electrode under visible light irradiation, while the hydrogen production was greatly enhanced by nearly 5-fold in the photoelectrocatalytic hydrogen production reaction.
研究领域:
材料科学
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能源科学
·
光催化
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Xianlong Wang,Yan Zhang,Shengjue Deng,Shiwei Lin
Bismuth vanadate (BiVO 4 ) has attracted wide attention as photoanode in water-splitting photoelectrochemical (PEC) devices. However, its catalytic performance is greatly limited by the serious charge recombination on the surface states. Herein, borate modified BiVO 4 plus additional CoPi cocatalyst (B-BVO/CoPi) is developed as photoanode for PEC cell via a simple soaking and electrodeposition process. Based on the electrochemistry tests and material characteristics, the borate groups [B(OH) 4 ] – is able to effectively prevent the charge recombination, while the outer CoPi cocatalyst enhance the activity toward oxygen evolution reaction . Therefore, the designed B-BVO/CoPi photoanode could obtain a high current density of 2.67 mA cm −2 at 1.23 V RHE with an onset potential of 0.29 V RHE , much higher than pristine BiVO 4 (0.78 mA cm −2 , 0.52 V RHE ). This work may provide a new insight for constructing multifunctional modified photoanodes for efficient solar conversion.
研究领域:
材料科学
·
能源转换
✓ 已验证
DOI
高影响因子
Frontiers of Environmental Science & Engineering
·
2021
·Vol. 16
·期 3
·1-16
·
IF 4.357
Zhao Shuangyang,Chen Chengxin,Ding Jie,Yang Shanshan,Zang Yani,Ren Nanqi
Fabrication of easily recyclable photocatalyst with excellent photocatalytic activity for degradation of organic pollutants in wastewater is highly desirable for practical application. In this study, a novel ternary magnetic photocatalyst BiVO 4 /Fe 3 O 4 /reduced graphene oxide (BiVO 4 /Fe 3 O 4 /rGO) was synthesized via a facile hydrothermal strategy. The BiVO 4 /Fe 3 O 4 with 0.5 wt% of rGO (BiVO 4 /Fe 3 O 4 /0.5% rGO) exhibited superior activity, degrading greater than 99% Rhodamine B (RhB) after 120 min solar light radiation. The surface morphology and chemical composition of BiVO 4 /Fe 3 O 4 /rGO were studied by scanning electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, UV visible diffuse reflectance spectroscopy, Fourier transform infrared spectroscopy, and Raman spectroscopy. The free radicals scavenging experiments demonstrated that hole (h + ) and superoxide radical (O 2 •− ) were the dominant species for RhB degradation over BiVO 4 /Fe 3 O 4 /rGO under solar light. The reusability of this composite catalyst was also investigated after five successive runs under an external magnetic field. The BiVO 4 /Fe 3 O 4 /rGO composite was easily separated, and the recycled catalyst retained high photocatalytic activity. This study demonstrates that catalyst BiVO 4 /Fe 3 O 4 /rGO possessed high dye removal efficiency in water treatment with excellent recyclability from water after use. The current study provides a possibility for more practical and sustainable photocatalytic process.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2023
·
IF 4.7
Cai Ling,Wang Zhiheng,Dai Yimin,Fang Chengqian,Li Yaqi,Yang Siwen,Wang Junlong,Liu Bo,Ding Xianglong,Zhang Yue-Fei,Li Yan,Wan Li
The composite materials with photocatalytic and oil–water separation properties are of great significance in purifying oily and dye wastewater. Herein, we used polydopamine and BiVO 4 to modify polyurethane sponge to obtain a sponge (B-PU) with photocatalytic dye degradation performance, and then utilized dodecyltrimethoxysilane (DTMS) to coat B-PU to obtain highly hydrophobic H-B-PU for oil–water separation. The degradation efficiency of methylene blue solution by B-PU reached 93.3% within 2 h under visible light irradiation. The prepared H-B-PU has good selectivity and cyclic adsorption performance for various oil–water mixtures. The adsorption capacity was 31.4–60.3 times the weight of the sponge itself. In addition, H-B-PU is competent for gravity-driven and pump-driven oil–water separation, and can maintain stable high hydrophobicity under various conditions. It is worth noting that after the recovery of H-B-PU, H-B-PU floats on the surface of MB solution in the form of hydrophobic debris to photocatalytically degrade MB, which provides an important idea for the reuse of oil–water separation sponge for photocatalytic degradation of dyes. The prepared materials do not need to use harmful reagents and are simple in synthesis, and have good potential in the treatment of oily and dye wastewater.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）