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V N D, Chandran A, Sen S, Chattopadhyaya M. Density functional theory-based modeling of the half-metallic g-C 3N 4/CoN 4 heterojunction for photocatalytic water splitting reaction. Phys Chem Chem Phys 2024; 26:21117-21133. [PMID: 39058365 DOI: 10.1039/d4cp00929k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/28/2024]
Abstract
Using density functional theory (DFT), we have investigated the structural, optical, electronic and magnetic properties of a graphitic carbon nitride (g-C3N4) and CoN4 composite to explore the effect of the heterojunction on the photocatalytic performance of g-C3N4. The structure of g-C3N4 is modified while complexing with CoN4 and the corresponding stabilization is confirmed through adhesion energy calculation. The phonon spectra analysis furthermore guaranteed the lattice-dynamic stability of the CoN4 bulk and the CoN4 slab. Pristine g-C3N4 is a wide band gap semiconductor, which becomes half metallic upon CoN4 inclusion. The metallicity in the g-C3N4/CoN4 composite originates from the spin down channel, keeping the spin up channel in a semiconducting state. The charge density analysis and work function calculation suggest a substantial amount of charge transfer from g-C3N4 to the CoN4 unit in the g-C3N4/CoN4 heterojunction. The model heterojunction of the g-C3N4/CoN4 composite can enhance the utilization ratio of visible light for the g-C3N4 photocatalyst. In g-C3N4/CoN4, the valence band maximum (VBM) has a more positive potential compared to O2/H2O (+1.23 V) on the normal hydrogen electrode (NHE) scale. However, the conduction band minimum (CBM) displays a more negative potential compared to H+/H2 (0 V) on the NHE scale. The details of the band structure, density of states and band edge position determining calculations confirm that the g-C3N4/CoN4 composite forms a type 1 heterojunction, making it a suitable photocatalyst for water splitting reaction. The practical application of the g-C3N4/CoN4 heterostructure as a photocatalyst was substantiated in the presence of polar solvent (water) by calculating the band gap, charge transfer interaction and charge density difference. There is a significant decrease of charge transfer and thereby charge density difference in the g-C3N4/CoN4 heterojunction in the presence of water; however, it still holds potential for use as a photocatalyst for water splitting reaction. The state-of-the-art theoretical modeling of the g-C3N4/CoN4 heterojunction is the first theoretical study incorporating the CoN4 crystal.
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Affiliation(s)
- Dhilshada V N
- Department of Chemistry, National Institute of Technology, Calicut, Calicut Mukkam Road, Kattangal, Kerala 673601, India.
| | - Aiswarya Chandran
- Department of Chemistry, National Institute of Technology, Calicut, Calicut Mukkam Road, Kattangal, Kerala 673601, India.
| | - Sabyasachi Sen
- Department of Physics, Shyampur Siddheswari Mahavidyalaya, Ajodhya, Shyampur, Howrah, Pin-711312& JIS College of Engineering Block A, Phase-III, Kalyani, Nadia, Pin-741235, India
| | - Mausumi Chattopadhyaya
- Department of Chemistry, National Institute of Technology, Calicut, Calicut Mukkam Road, Kattangal, Kerala 673601, India.
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Moharramzadeh Goliaei E. Photocatalytic Efficiency for CO 2 Reduction of Co and Cluster Co 2O 2 Supported on g-C 3N 4: A Density Functional Theory and Machine Learning Study. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2024; 40:7871-7882. [PMID: 38578103 DOI: 10.1021/acs.langmuir.3c03550] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/06/2024]
Abstract
It is well known from experimental results that a single atom of cobalt supported on g-C3N4 is an efficient photocatalyst for the reduction of CO2 to CO, with a better photocatalytic activity than g-C3N4. In this work, we investigate the performance as catalysts for the CO2 reduction of single atoms of cobalt and Co2O2 clusters supported on graphitic carbon nitride (g-C3N4). Employing density functional theory plus Hubbard (DFT + U) calculations, we investigate in detail the reduction mechanisms to CO and HCOOH for the first time. We find that deposition of cobalt on g-C3N4 decreases the work function of g-C3N4 to 6.6 eV and provides a better candidate for the reduction reaction. In addition, we find that the preferred product of CO2 reduction on Co@g-C3N4 is CO, with a rate-determining barrier of 0.97 eV, while on Co2O2@g-C3N4, CO2 reduces to formate with a rate-determining barrier of 0.44 eV. We determine the creation of CO2 from COOH to only take place on Co2O2@g-C3N4, with a (relatively high) barrier of 2.27 eV. In order to obtain more easily the transition state energies of the reactions mentioned above, we applied machine learning methods to search for high-importance descriptors for these quantities, in the case of single transition metal atoms supported on C3N4. Interestingly, our results show that our quantities of interest are closely related to the adsorption energies of products and normalized valence electrons of the products of the elementary reactions as well as those of the metal atoms. The former of these two sets of features can be straightforwardly obtained via DFT, while the latter energies are extensively tabulated. Our results offer guidance for the design of catalysts and photocatalysts for CO2 reduction on single-metal atoms supported on C3N4.
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Affiliation(s)
- Elham Moharramzadeh Goliaei
- Dipartimento di Fisica e Astronomia "Galileo Galilei", Università degli Studi di Padova, 35131 Padova, Italy
- Department of Physics, University of Trento, Via Sommarive 14, 38123 Povo, Italy
- The Abdus Salam ICTP, Strada Costiera 11, 34151 Trieste, Italy
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3
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Basyach P, Deb J, Sk S, Pal U, Gogoi M, Sastry GN, Saikia L. Controlled Ni doping on a g-C 3N 4/CuWO 4 photocatalyst for improved hydrogen evolution. Phys Chem Chem Phys 2023; 25:23033-23046. [PMID: 37599612 DOI: 10.1039/d3cp03194b] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/22/2023]
Abstract
The development of a low-cost, environment-friendly and suitable semiconductor-based heterogeneous photocatalyst poses a great challenge towards extremely competent and substantial hydrogen evolution. A series of environment-friendly and proficient S-scheme Ni-doped CuWO4 nanocrystals supported on g-C3N4 nanocomposites (Ni-CuWO4/g-C3N4) were constructed to ameliorate the photocatalytic efficacy of pure g-C3N4 and Ni-CuWO4 and their activity in H2 generation through photocatalytic water splitting was evaluated. The Ni-CuWO4 nanoparticles were synthesized through doping of Ni2+ on wolframite CuWO4 crystals via the chemical precipitation method. An elevated hydrogen generation rate of 1980 μmol h-1 g-1 was accomplished over the 0.2Ni-CuWO4/g-C3N4 (0.2NCWCN) nanocomposite with an apparent quantum yield (AQY) of 6.49% upon visible light illumination (λ ≥ 420 nm), which is evidently 7.1 and 17.2 fold higher than those produced from pristine g-C3N4 and Ni-CuWO4. The substantial enhancement in the photocatalytic behaviour is primarily because of the large surface area, limited band gap energy of the semiconductor composite and magnified light harvesting capability towards visible light through the inclusion of g-C3N4, thus diminishing the reassembly rate of photoinduced excitons. Further, density functional theory (DFT) calculations were performed to investigate the structural, electronic and optical properties of the composite. Theoretical results confirmed that the Ni-CuWO4/g-C3N4 composite is a potential candidate for visible-light-driven photocatalysts and corroborated with the experimental findings. This research provides a meaningful and appealing perspective on developing cost-effective and very proficient two-dimensional (2D) g-C3N4-based materials for photocatalytic H2 production to accelerate the separation and transmission process of radiative charge carriers.
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Affiliation(s)
- Purashri Basyach
- Advanced Materials Group, Materials Sciences & Technology Division, CSIR-North East Institute of Science and Technology, Jorhat-785006, Assam, India.
- Academy of Scientific and Innovative Research, Ghaziabad, UP, India
| | - Jyotirmoy Deb
- Advanced Computation and Data Sciences Division, CSIR-North East Institute of Science and Technology, Jorhat-785006, Assam, India
| | - Saddam Sk
- Academy of Scientific and Innovative Research, Ghaziabad, UP, India
- Department of Energy and Environmental Engineering, CSIR-Indian Institute of Chemical Technology, Hyderabad-500007, India
| | - Ujjwal Pal
- Academy of Scientific and Innovative Research, Ghaziabad, UP, India
- Department of Energy and Environmental Engineering, CSIR-Indian Institute of Chemical Technology, Hyderabad-500007, India
| | - Madhulekha Gogoi
- Advanced Materials Group, Materials Sciences & Technology Division, CSIR-North East Institute of Science and Technology, Jorhat-785006, Assam, India.
| | - G Narahari Sastry
- Academy of Scientific and Innovative Research, Ghaziabad, UP, India
- Advanced Computation and Data Sciences Division, CSIR-North East Institute of Science and Technology, Jorhat-785006, Assam, India
| | - Lakshi Saikia
- Advanced Materials Group, Materials Sciences & Technology Division, CSIR-North East Institute of Science and Technology, Jorhat-785006, Assam, India.
- Academy of Scientific and Innovative Research, Ghaziabad, UP, India
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4
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Lin H, Wu J, Zhou F, Zhao X, Lu P, Sun G, Song Y, Li Y, Liu X, Dai H. Graphitic carbon nitride-based photocatalysts in the applications of environmental catalysis. J Environ Sci (China) 2023; 124:570-590. [PMID: 36182164 DOI: 10.1016/j.jes.2021.11.017] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2021] [Revised: 10/28/2021] [Accepted: 11/13/2021] [Indexed: 06/16/2023]
Abstract
Semiconductor photocatalytic technology has shown great prospects in converting solar energy into chemical energy to mitigate energy crisis and solve environmental pollution problems. The key issue is the development of high-efficiency photocatalysts. Various strategies in the state-of-the-art advancements, such as heterostructure construction, heteroatom doping, metal/single atom loading, and defect engineering, have been presented for the graphitic carbon nitride (g-C3N4)-based nanocomposite catalysts to design their surface chemical environments and internal electronic structures to make them more suitable for different photocatalytic applications. In this review, nanoarchitecture design, synthesis methods, photochemical properties, potential photocatalytic applications, and related reaction mechanisms of the modified high-efficiency carbon nitride-based photocatalysts were briefly summarized. The superior photocatalytic performance was identified to be associated with the enhanced visible-light response, fast photoinduced electron-hole separation, efficient charge migration, and increased unsaturated active sites. Moreover, the further advance of the visible-light harvesting and solar-to-energy conversions are proposed.
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Affiliation(s)
- Hongxia Lin
- Hefei Institute for Public Safety Research, Tsinghua University, Hefei 230601, China; Anhui Province Key Laboratory of Human Safety, Hefei 230601, China
| | - Jinmo Wu
- Hefei Institute for Public Safety Research, Tsinghua University, Hefei 230601, China; Anhui Province Key Laboratory of Human Safety, Hefei 230601, China
| | - Fan Zhou
- Hefei Institute for Public Safety Research, Tsinghua University, Hefei 230601, China; Anhui Province Key Laboratory of Human Safety, Hefei 230601, China
| | - Xiaolong Zhao
- Hefei Institute for Public Safety Research, Tsinghua University, Hefei 230601, China; Anhui Province Key Laboratory of Human Safety, Hefei 230601, China
| | - Pengfei Lu
- Hefei Institute for Public Safety Research, Tsinghua University, Hefei 230601, China; Anhui Province Key Laboratory of Human Safety, Hefei 230601, China
| | - Guanghui Sun
- Hefei Institute for Public Safety Research, Tsinghua University, Hefei 230601, China; Anhui Province Key Laboratory of Human Safety, Hefei 230601, China
| | - Yuhan Song
- Hefei Institute for Public Safety Research, Tsinghua University, Hefei 230601, China; Anhui Province Key Laboratory of Human Safety, Hefei 230601, China
| | - Yayun Li
- Hefei Institute for Public Safety Research, Tsinghua University, Hefei 230601, China; Anhui Province Key Laboratory of Human Safety, Hefei 230601, China
| | - Xiaoyong Liu
- Hefei Institute for Public Safety Research, Tsinghua University, Hefei 230601, China; Anhui Province Key Laboratory of Human Safety, Hefei 230601, China
| | - Hongxing Dai
- Beijing Key Laboratory for Green Catalysis and Separation, Key Laboratory of Beijing on Regional Air Pollution Control, Key Laboratory of Advanced Functional Materials, Education Ministry of China, Laboratory of Catalysis Chemistry and Nanoscience, Department of Environmental Chemical Engineering, School of Environmental and Chemical Engineering, Faculty of Environment and Life Science, Beijing University of Technology, Beijing 100124, China.
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5
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Zhang J, Tang X, Chen M, Ma D, Ju L. Tunable Photocatalytic Water Splitting Performance of Armchair MoSSe Nanotubes Realized by Polarization Engineering. Inorg Chem 2022; 61:17353-17361. [PMID: 36257300 DOI: 10.1021/acs.inorgchem.2c03075] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The photocatalytic properties of Janus transition metal dichalcogenide (TMD) nanotubes are closely correlated with the electrostatic potential difference between their inner and outer surfaces (ΔΦ). However, due to some distraction from the tubular structures, it remains a great challenge to calculate their ΔΦ directly. Here, we creatively work out the ΔΦ of Janus MoSSe armchair single-walled nanotubes (A-SWNTs) with their corresponding building block models by first-principles calculations. The ΔΦ increases as the diameter reduces. After considering ΔΦ, we find that all of these MoSSe A-SWNTs possess suitable band-edge positions required for water redox reactions and high solar-to-hydrogen (STH) conversion efficiencies. The built-in field induced by the ΔΦ promotes the oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) to proceed separately on the inner and outer surfaces. Especially, the photoexcited carriers exhibit adequate driving forces for OER and HER. Besides, constructing a double-walled nanotube can dramatically increase ΔΦ, which also further improves the separation and redox capacity of photoexcited carriers as well as the STH conversion efficiency. Moreover, all of these MoSSe armchair nanotubes have outstanding optical absorption in the visible light range. Our studies provide an effective strategy to improve the photocatalytic water-splitting performance of Janus TMD nanotubes.
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Affiliation(s)
- Jing Zhang
- School of Physics and Electric Engineering, Anyang Normal University, Anyang455000, China
| | - Xiao Tang
- College of Science, Institute of Materials Physics and Chemistry, Nanjing Forestry University, Nanjing210037, China
| | - Mingyan Chen
- Hongzhiwei Technology (Shanghai) Co. Ltd., 1599 Xinjinqiao Road, Pudong, Shanghai201206, China
| | - Dongwei Ma
- Key Laboratory for Special Functional Materials of Ministry of Education, and School of Materials Science and Engineering, Henan University, Kaifeng475004, China
| | - Lin Ju
- School of Physics and Electric Engineering, Anyang Normal University, Anyang455000, China
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6
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Yao W, Li D, Wei S, Liu X, Liu X, Wang W. Density Functional Theory Study on the Enhancement Mechanism of the Photocatalytic Properties of the g-C 3N 4/BiOBr(001) Heterostructure. ACS OMEGA 2022; 7:36479-36488. [PMID: 36278081 PMCID: PMC9583644 DOI: 10.1021/acsomega.2c04298] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/07/2022] [Accepted: 09/23/2022] [Indexed: 06/16/2023]
Abstract
The van der Waals heterostructures fabricated in two semiconductors are currently attracting considerable attention in various research fields. Our study uses density functional theory calculations within the Heyd-Scuseria-Ernzerhof hybrid functional to analyze the geometric structure and electronic structure of the g-C3N4/BiOBr(001) heterojunction in order to gain a better understanding of its photocatalytic properties. The calculated band alignments show that g-C3N4/BiOBr can function as a type-II heterojunction. In this heterojunction, the electrons and holes can effectively be separated at the interface. Moreover, we find that the electronic structure and band alignment of g-C3N4/BiOBr(001) can be tuned using external electric fields. It is also noteworthy that the optical absorption peak in the visible region is enhanced under the action of the electric field. The electric field may even improve the optical properties of the g-C3N4/BiOBr(001) heterostructure. Given the results of our calculations, it seems that g-C3N4/BiOBr(001) may be significantly superior to visible light photocatalysis.
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Affiliation(s)
- Wenzhi Yao
- Department
of Environmental and Municipal Engineering, North China University of Water Conservancy and Electric Power, Zhengzhou450011, China
| | - Dongying Li
- Department
of Environmental and Municipal Engineering, North China University of Water Conservancy and Electric Power, Zhengzhou450011, China
| | - Shuai Wei
- Department
of Environmental and Municipal Engineering, North China University of Water Conservancy and Electric Power, Zhengzhou450011, China
| | - Xiaoqing Liu
- Department
of Environmental and Municipal Engineering, North China University of Water Conservancy and Electric Power, Zhengzhou450011, China
| | - Xuefei Liu
- College
of Physics and Electronic Science, Guizhou
Normal University, Guiyang550025, China
| | - Wentao Wang
- College
of Physics and Electronic Science, Guizhou
Normal University, Guiyang550025, China
- Guizhou
Provincial Key Laboratory of Computational Nano-Material Science, Guizhou Education University, Guiyang550018, China
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7
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Chen X, Wu Y, Deng M, Shen H, Ding J, Wang W. Effects of Fluorination and Molybdenum Codoping on Monoclinic BiVO 4 Photocatalyst by HSE Calculations. ACS OMEGA 2022; 7:17075-17082. [PMID: 35647421 PMCID: PMC9134236 DOI: 10.1021/acsomega.2c00382] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/19/2022] [Accepted: 05/04/2022] [Indexed: 06/15/2023]
Abstract
Monoclinic phase bismuth vanadate (BiVO4) is one of the most promising photoelectrochemical materials used in water-splitting photoelectrochemical cells. It could be even better if its band gap and charge transport characteristics were optimized. Although codoping of BiVO4 has proven to be an effective strategy, its effects are remarkably poorly understood. Using the Heyd-Scuseria-Ernzerhof (HSE) hybrid functional, we estimate the formation energy, electronic properties, and photocatalytic activities of F and Mo codoped BiVO4. We find that Mo atoms prefer to replace V atoms, whereas F atoms prefer to replace O atoms (FOMoV-doped BiVO4) under oxygen-poor conditions according to calculated formation energies. BiVO4 doped with FOMoV is found to be shallow-level doped, occurring with some continuum states above the conduction band edge, which is advantageous for photochemical catalysis. Moreover, FOMoV-doped BiVO4 shows absorption stronger than that of pure BiVO4 in the visible spectrum. Based on the band-edge calculation, BiVO4 doped with FOMoV still retains a high oxidizing capacity. It has been shown that FOMoV-doped BiVO4 exhibits a very high photocatalytic activity under visible light.
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Affiliation(s)
- Xia Chen
- School
of Physics and Optoelectronic Engineering, Xiangtan University, Xiangtan 411100, China
| | - Yonggang Wu
- School
of Physics and Electronic Science, Guizhou
Education University, Guiyang 550018, China
| | - MingSen Deng
- Guizhou
Provincial Key Laboratory of Computational Nano-Material Science, Guizhou Education University, Guiyang 550018, China
| | - Hujun Shen
- Guizhou
Provincial Key Laboratory of Computational Nano-Material Science, Guizhou Education University, Guiyang 550018, China
| | - Jianwen Ding
- School
of Physics and Optoelectronic Engineering, Xiangtan University, Xiangtan 411100, China
| | - Wentao Wang
- Guizhou
Provincial Key Laboratory of Computational Nano-Material Science, Guizhou Education University, Guiyang 550018, China
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8
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Photoelectrochemical Water Splitting Over Decahedron Shaped BiVO4 Photoanode by Tuning the Experimental Parameters. J CLUST SCI 2022. [DOI: 10.1007/s10876-022-02236-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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9
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Meng J, Wang J, Wang J, Li Q, Yang J. C 7N 6/Sc 2CCl 2 Weak van der Waals Heterostructure: A Promising Visible-Light-Driven Z-Scheme Water Splitting Photocatalyst with Interface Ultrafast Carrier Recombination. J Phys Chem Lett 2022; 13:1473-1479. [PMID: 35129359 DOI: 10.1021/acs.jpclett.1c04194] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Designing and characterizing high-efficiency direct Z-scheme photocatalysts both from theoretical and experimental aspects still remain a big challenge. Here, based on extensive first-principles calculations combined with excited state dynamics simulations, we report that a weak van der Waals (vdW) C7N6/Sc2CCl2 heterostructure is a mediator-free direct Z-scheme photocatalyst for solar water splitting. Theoretical results clearly reveal that this heterostructure displays a nice light-harvesting performance extending to the near-infrared region. The relatively strong interfacial non-adiabatic coupling accelerates the interlayer carrier recombination in the time scale of sub-picoseconds. The well separated electrons and holes with a strong redox capacity make the hydrogen evolution reaction spontaneously occur on the C7N6 surface and the oxygen evolution reaction on the Se-doped Sc2CCl2 surface, respectively, when the proposed heterostructure is radiated with solar light.
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Affiliation(s)
- Jie Meng
- Department of Chemical Physics & Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Jiajun Wang
- Tianjin Key Laboratory of Structure and Performance for Functional Molecules; College of Chemistry, Tianjin Normal University, Tianjin 300387, China
| | - Jianing Wang
- Department of Chemical Physics & Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Qunxiang Li
- Department of Chemical Physics & Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Jinlong Yang
- Department of Chemical Physics & Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China, Hefei, Anhui 230026, China
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10
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Li Y, Dai X, He L, Bu Y, Ao JP. Crystal-reconstructed BiVO 4 semiconductor photoelectrochemical sensor for ultra-sensitive tumor biomarker detection. J Mater Chem B 2022; 10:870-879. [PMID: 35050300 DOI: 10.1039/d1tb02576g] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
In this study, we developed a crystal-reconstructed-BiVO4 aptamer photoelectrochemical (PEC) biosensor by a high-energy laser treatment technique. This biosensor achieves a limit of detection (LOD) (0.82 ag mL-1), linear detection range (1 ag mL-1 to 2 ng mL-1), and resolution ratio (∼18 molecules per mL) for prostate-specific antigen (PSA) tumor biomarker detection. Furthermore, reconstructed surface microstructure and oxygen vacancy doping energy formation after crystal reconstruction induce the stereo-hindrance effect and photogenerated hole energy is reduced during PSA target detection. In this case, a photocurrent inhibition phenomenon for PSA detection is noticed. Based on this photocurrent inversion phenomenon, some dysoxidizable nucleonic acid tumor (miRNA-21) and virus biomarkers (RdRp-COVID) can be detected with a LOD level of ∼10-16 M by linking the corresponding base paring probe on the surface of the crystal-reconstructed photoanode. In addition to high sensitivity, this PEC biosensor presents high detection specificity, stability, and accuracy in clinical verification. Thus, this crystal-reconstructed PEC biosensor shows application potential in the fields of multi-tumor or viral biomarker detection.
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Affiliation(s)
- Yang Li
- Key Laboratory of Wide Band-Gap Semiconductor Materials and Devices, School of Microelectronics, Xidian University, Xi'an, 710071, China.
| | - Xianying Dai
- Key Laboratory of Wide Band-Gap Semiconductor Materials and Devices, School of Microelectronics, Xidian University, Xi'an, 710071, China.
| | - Lin He
- Shaanxi Provincial Cancer Hospital, Xi'an, 710061, China
| | - Yuyu Bu
- Key Laboratory of Wide Band-Gap Semiconductor Materials and Devices, School of Microelectronics, Xidian University, Xi'an, 710071, China.
| | - Jin-Ping Ao
- Key Laboratory of Wide Band-Gap Semiconductor Materials and Devices, School of Microelectronics, Xidian University, Xi'an, 710071, China.
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2D/2D S-scheme heterojunction with a covalent organic framework and g-C3N4 nanosheets for highly efficient photocatalytic H2 evolution. CHINESE JOURNAL OF CATALYSIS 2022. [DOI: 10.1016/s1872-2067(22)64094-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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12
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Wu B, Cai J, Zhou X. Structural, electronic, optical and photocatalytic properties of KTaO 3 with NiO cocatalyst modification. RSC Adv 2022; 12:32270-32279. [DOI: 10.1039/d2ra06425a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2022] [Accepted: 11/04/2022] [Indexed: 11/11/2022] Open
Abstract
Density functional theory calculations reveal that NiO serves as an oxidation cocatalyst to form type-II band alignment with KTaO3, which suppresses the recombination of photoinduced carriers and enhances the photocatalytic activity of KTaO3.
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Affiliation(s)
- Bin Wu
- Organ Transplant Center, Fujian Medical University Union Hospital, Fuzhou 350000, China
| | - Jinzhen Cai
- Organ Transplant Center, Fujian Medical University Union Hospital, Fuzhou 350000, China
| | - Xin Zhou
- College of Environment and Chemical Engineering, Dalian University, Liaoning 116622, China
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Hybrid triazine-based g-C3N4(0 0 1)/anatase TiO2(0 0 1) heterojunction: Insights into enhanced photocatalytic mechanisms via DFT calculation. J Photochem Photobiol A Chem 2022. [DOI: 10.1016/j.jphotochem.2021.113577] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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14
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Ren Y, Han Q, Yang J, Zhao Y, Xie Y, Wen H, Jiang Z. A promising catalytic solution of NO reduction by CO using g-C 3N 4/TiO 2: A DFT study. J Colloid Interface Sci 2021; 610:152-163. [PMID: 34922072 DOI: 10.1016/j.jcis.2021.12.034] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2021] [Revised: 11/30/2021] [Accepted: 12/04/2021] [Indexed: 10/19/2022]
Abstract
The direct catalytic reduction of nitric oxide (NO) by carbon monoxide (CO) to form harmless N2 and CO2 is an ideal strategy to simultaneously remove both these hazardous gases. To investigate the feasibility of using graphitic carbon nitride/titanium dioxide (g-C3N4/TiO2) to catalyze the NO reduction by CO, we systematically explore the effect of the interfacial coupling between g-C3N4 and TiO2 on the photo-induced carrier separation, the light absorption, and the surface reaction for the NO reduction by using density functional theory. The g-C3N4/TiO2 is predicted to have a better photocatalytic activity for NO reduction than g-C3N4, due to the enhanced light absorption intensity and the accelerated separation of the photo-excited electron-hole pairs. By comparing the reaction routes on g-C3N4/TiO2 and g-C3N4, the results indicate that the introduction of TiO2 can keep the surface reaction process intact with the NO dissociation (N2O formation) being the rate-determining (crucial) step. Moreover, TiO2 can facilitate the desorption of NO reduction products, avoiding the deactivation of g-C3N4. This work shows that the composition of TiO2 into g-C3N4 provides a promising catalyst in NO reduction by CO.
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Affiliation(s)
- Yuehong Ren
- School of Physics, Beijing Institute of Technology, Beijing 100081, China
| | - Qingzhen Han
- Beijing Academy of Quantum Information Sciences, Beijing 100193, China.
| | - Jie Yang
- Shandong Graphenjoy Advanced Material Co. Ltd, Dezhou 253072, China
| | - Yuehong Zhao
- Division of Environment Technology and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
| | - Yongbing Xie
- Division of Environment Technology and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
| | - Hao Wen
- Division of Environment Technology and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
| | - Zhaotan Jiang
- School of Physics, Beijing Institute of Technology, Beijing 100081, China.
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15
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Bano K, Mittal SK, Singh PP, Kaushal S. Sunlight driven photocatalytic degradation of organic pollutants using a MnV 2O 6/BiVO 4 heterojunction: mechanistic perception and degradation pathways. NANOSCALE ADVANCES 2021; 3:6446-6458. [PMID: 36133498 PMCID: PMC9419509 DOI: 10.1039/d1na00499a] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/28/2021] [Accepted: 09/01/2021] [Indexed: 05/06/2023]
Abstract
In the field of photocatalysis, fabrication of a heterojunction structure with effective charge separation at the interface and charge shift to enhance the photocatalytic activity has acquired extensive consideration. In the present investigation, MnV2O6/BiVO4 heterojunction samples with excellent photocatalytic performance under sunlight irradiation were conveniently synthesized by a hydrothermal technique, and characterized by UV-Vis, FTIR, XRD, FESEM, HRTEM, PL, BET and XPS techniques. The prepared samples were investigated as photocatalysts for degrading MB and RhB dyes under sunlight. Among various samples of MnV2O6/BiVO4, the S-V hetero-junction sample exhibited maximum photocatalytic activity with 98% and 96% degradation of MB and RhB dyes, respectively, in 6 and 35 min. The high photocatalytic activity of MnV2O6/BiVO4 may be due to the successful generation and shift of charges in the presence of visible light. The average reduction of chemical oxygen demand (COD) was found to be 75% after irradiation with direct sunlight. In the degradation process of dyes, superoxide anion radicals were the main responsive species, as revealed by trapping experiments. The degradation efficiency of MnV2O6/BiVO4 heterojunction did not diminish even after four cycles. In addition, the catalytic performance of the fabricated heterojunction was also explored for reducing 4-nitrophenols (4-NP) by using NaBH4. Absolute conversion of 4-NP to 4-aminophenol (4-AP) occurred without the production of intermediate byproducts.
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Affiliation(s)
- Karina Bano
- Department of Chemistry, Sri Guru Granth Sahib World University Fatehgarh Sahib Punjab India
| | - Susheel K Mittal
- School of Chemistry & Biochemistry, Thapar Institute of Engineering and Technology Patiala India
| | - Prit Pal Singh
- Department of Chemistry, Sri Guru Granth Sahib World University Fatehgarh Sahib Punjab India
| | - Sandeep Kaushal
- Department of Chemistry, Sri Guru Granth Sahib World University Fatehgarh Sahib Punjab India
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16
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Wu Z, Zhao Y, Mi L, Guo Y, Wang H, Liu K, Zhang K, Wang B. Preparation of g-C3N4/TiO2 by template method and its photocatalytic performance. Colloids Surf A Physicochem Eng Asp 2021. [DOI: 10.1016/j.colsurfa.2021.126756] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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17
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Wang M, Tan G, Feng S, Yin L, Wang Y, Zhang B, Lv L, Ren H. Construction of Ag/NaBiO 3 with dual active sites for photocatalytic NO deep oxidation and long-lasting organic pollutants degradation in the dark. JOURNAL OF HAZARDOUS MATERIALS 2021; 416:125877. [PMID: 34492817 DOI: 10.1016/j.jhazmat.2021.125877] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/22/2021] [Revised: 03/23/2021] [Accepted: 04/09/2021] [Indexed: 06/13/2023]
Abstract
Ag/NaBiO3 with dual active sites and high capacitance was prepared by the photo-deposition method. Upon light illumination, the reduction of Ag+ to Ag, the introduction of oxygen vacancies, and the electron storage in Ag nanoparticles simultaneously happened. NO, and O2 adsorbed and activated at Ag site and oxygen vacancy site, respectively, to produce active ON* and •O2- radical species. The increased concentrations of the active oxygen species and the pre-oxidation of NO resulted in the enhanced NO removal with inhibited production of NO2. Moreover, the high capacitance of Ag and the continuous charge transfer from defective NaBiO3 to Ag offered the enhanced and long-lasting dark catalytic activity of the Ag/NaBiO3. The stored electrons in Ag were directly released in dark to decompose methyl orange and/or tetracycline. This work provides a novel idea of designing and preparing a multifunctional catalytic material for environmental cleaning.
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Affiliation(s)
- Min Wang
- Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Materials, School of Materials Science and Engineering, Shaanxi University of Science & Technology, Xi'an 710021, China
| | - Guoqiang Tan
- Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Materials, School of Materials Science and Engineering, Shaanxi University of Science & Technology, Xi'an 710021, China.
| | - Shuaijun Feng
- Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Materials, School of Materials Science and Engineering, Shaanxi University of Science & Technology, Xi'an 710021, China
| | - Lixiong Yin
- Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Materials, School of Materials Science and Engineering, Shaanxi University of Science & Technology, Xi'an 710021, China.
| | - Yong Wang
- Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Materials, School of Materials Science and Engineering, Shaanxi University of Science & Technology, Xi'an 710021, China
| | - Bixin Zhang
- Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Materials, School of Materials Science and Engineering, Shaanxi University of Science & Technology, Xi'an 710021, China
| | - Long Lv
- College of Cryptography Engineering, Engineering University of PAP, Xi'an 710086, China
| | - Huijun Ren
- School of Arts and Sciences, Shaanxi University of Science & Technology, Xi'an 710021, China
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18
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Construction of an arsenene/g-C3N4 hybrid heterostructure towards enhancing photocatalytic activity of overall water splitting: A first-principles study. J SOLID STATE CHEM 2021. [DOI: 10.1016/j.jssc.2021.122138] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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19
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Wu Y, Zhang J, Long B, Zhang H. The stability and electronic and photocatalytic properties of the ZnWO 4 (010) surface determined from first-principles and thermodynamic calculations. RSC Adv 2021; 11:23477-23490. [PMID: 35479806 PMCID: PMC9036558 DOI: 10.1039/d1ra03218f] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2021] [Accepted: 06/21/2021] [Indexed: 01/11/2023] Open
Abstract
We present the results of the generalized-gradient approximation of Perdew, Burke and Ernzerhof (GGA-PBE) and the Heyd-Scuseria-Ernzerhof (HSE06) hybrid functional calculations of the atomic and the electronic structures of ZnWO4 (010) surfaces. The total energies obtained from these calculations are used to analyze the thermodynamic stability of the surfaces. The surface phase diagrams are constructed by surface Gibbs free energies obtained as a function of temperature and oxygen partial pressure. Our results suggested that the stable area of the surface terminations of ZnWO4 (010) has little correlation with the functional selected. The stability phase diagram shows that O-Zn, DL-W, and DL-Zn terminations of ZnWO4 (010) can be stabilized under certain thermodynamic equilibrium conditions. Based on the HSE06 hybrid functional, we calculate the electronic structures for three possible stability surface terminations. It is found that there is a fat band of the surface states in DL-W termination, which shows a delocalized feature. This fat band acts as an electron transition bridge between the valence band (VB) and conduction band (CB). It contributes to visible-light absorption by two-step optical transition with the first transition from the VB to the fat band and the second from the fat band to the CB. Significantly, the conduction band minimum (CBM) band edge position of DL-W termination is favourable for H2 evolution as the CBM edge is located above the water reduction level (H+/H2). Simultaneously, DL-W termination's valence band maximum (VBM) potential shows a strong potential for O2 generation from water oxidation because of the higher VBM edge with respect to the water oxidation level (H2O/O2). These results may help explore ZnWO4 (010) surfaces' intrinsic properties, providing a helpful strategy for experimental studies of ZnWO4-based photocatalysts in the future.
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Affiliation(s)
- Yonggang Wu
- College of Physics, Sichuan University Sichuan 610065 China.,School of Physics and Electronic Science, Guizhou Education University Guiyang 550018 China
| | - Jihua Zhang
- Guizhou Provincial Key Laboratory of Computational Nano-Material Science, Guizhou Education University Guiyang 550018 China
| | - Bingwei Long
- College of Physics, Sichuan University Sichuan 610065 China
| | - Hong Zhang
- College of Physics, Sichuan University Sichuan 610065 China
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20
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Wu Y, Zhang J, Long B, Zhang H. The Thermodynamic Stability, Electronic and Photocatalytic Properties of the ZnWO 4(100) Surface as Predicted by Screened Hybrid Density Functional Theory. ACS OMEGA 2021; 6:15057-15067. [PMID: 34151086 PMCID: PMC8210413 DOI: 10.1021/acsomega.1c01214] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/06/2021] [Accepted: 05/20/2021] [Indexed: 06/13/2023]
Abstract
Zinc tungstate (ZnWO4) is an outstanding photocatalyst for water splitting and organic contaminant degradation under visible light irradiation. Surface termination stabilities are significant for understanding the photochemical oxidation and reactions on the ZnWO4 surface. Based on density functional theory, we calculated the thermodynamic stability of possible surface terminations for ZnWO4(100). The surface stability phase diagrams show that the Zn2O4-Zn8W6O28, W2O4-Zn8W10O36, and Zn2-Zn8W6O24 terminations of ZnWO4(100) can be stabilized under certain thermodynamic equilibrium conditions. The electronic structures for these three possible stability surface terminations are calculated based on the Heyd-Scuseria-Ernzerhof (HSE06) hybrid functional to give dependable theoretical band gap values. It is found that the surface states of W2O4-Zn8W10O36 termination are in the band gap, which shows a delocalized performance. The calculated absorption coefficients of W2O4-Zn8W10O36 termination show stronger absorption than bulk ZnWO4 in the visible-light region. The band edge calculation shows that the valence band maximum and conduction band minimum of the W2O4-Zn8W10O36 termination can fulfill the hydrogen evolution reaction and oxygen evolution reaction requirements at the same time. Furthermore, work functions are extraordinarily distinct for various surface terminations. This result suggests that the ZnWO4-based direct Z-scheme heterostructure can be controlled by obtaining the thermodynamically preferred surface termination under suitable conditions. Our results can predict ZnWO4(100) surface structures and properties under the entire range of accessible environmental conditions.
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Affiliation(s)
- Yonggang Wu
- College
of Physics, Sichuan University, Sichuan 610065, China
- School
of Physics and Electronic Science, Guizhou
Education University, Guiyang 550018, China
| | - Jihua Zhang
- Guizhou
Provincial Key Laboratory of Computational Nano-Material Science, Guizhou Education University, Guiyang 550018, China
| | - Bingwei Long
- College
of Physics, Sichuan University, Sichuan 610065, China
| | - Hong Zhang
- College
of Physics, Sichuan University, Sichuan 610065, China
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21
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Chen Z, Ma X, Hu J, Wan F, Xu P, Wang G, Wang M, Deng S, Huang C. Band alignment of Zr 2CO 2/MoS 2 heterostructures under an electric field. NEW J CHEM 2021. [DOI: 10.1039/d1nj02440j] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Tunable energy bands of Zr2CO2/MoS2 heterostructures by an external electric field.
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Affiliation(s)
- Zhangze Chen
- School of Science, Hubei University of Technology, Wuhan 430068, China
| | - Xinguo Ma
- School of Science, Hubei University of Technology, Wuhan 430068, China
| | - Jisong Hu
- School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Fengda Wan
- School of Science, Hubei University of Technology, Wuhan 430068, China
| | - Peng Xu
- School of Science, Hubei University of Technology, Wuhan 430068, China
| | - Guoyu Wang
- School of Science, Hubei University of Technology, Wuhan 430068, China
| | - Mei Wang
- School of Science, Hubei University of Technology, Wuhan 430068, China
| | - Shuiquan Deng
- Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, China
| | - Chuyun Huang
- School of Science, Hubei University of Technology, Wuhan 430068, China
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22
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Zhang J, Deng P, Deng M, Shen H, Feng Z, Li H. Hybrid Density Functional Theory Study of Native Defects and Nonmetal (C, N, S, and P) Doping in a Bi 2WO 6 Photocatalyst. ACS OMEGA 2020; 5:29081-29091. [PMID: 33225139 PMCID: PMC7675596 DOI: 10.1021/acsomega.0c03685] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/31/2020] [Accepted: 10/26/2020] [Indexed: 06/11/2023]
Abstract
Native defects and nonmetal doping have been shown to be an effective way to optimize the photocatalytic properties of Bi2WO6. However, a detailed understanding of defect physics in Bi2WO6 has been lacking. Here, using the Heyd-Scuseria-Ernzerhof hybrid functional defect calculations, we study the formation energies, electronic structures, and optical properties of native defects and nonmetal element (C, N, S, and P) doping into Bi2WO6. We find that the Bi vacancy (Bivac), O vacancy (Ovac), S doping on the O site (SO), and N doping on the O site (NO) defects in the Bi2WO6 can be stable depending on the Fermi level and chemical potentials. By contrast, the substitution of an O atom by a C or P atom (CO, PO) has high formation energy and is unlikely to form. The calculated electronic structures of the Bivac, Ovac, SO, and NO defects indicate that the band-gap reduction of Ovac 2+, Bivac 3-, and SO defects is mainly due to forming shallow impurity levels within the band gap. The calculated absorption coefficients of Ovac 2+, Bivac 3-, and SO show strong absorption in the visible light region, which is in good agreement with the experimental results. Hence, Ovac 2+, Bivac 3-, and SO defects can improve the adsorption capacity of Bi2WO6, which helps enhance its photocatalytic performance. Our results provide insights into how to enhance the photocatalytic activity of Bi2WO6 for energy and environmental applications through the rational design of defect-controlled synthesis conditions.
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Affiliation(s)
- Jihua Zhang
- Guizhou Provincial
Key Laboratory of Computational Nano-Material Science, Guizhou Education University, Guiyang 550018, China
| | - Panluo Deng
- Institute for Computational Materials Science, School
of Physics and Electronics, Henan University, Kaifeng 475004, China
| | - Mingsen Deng
- Guizhou Provincial
Key Laboratory of Computational Nano-Material Science, Guizhou Education University, Guiyang 550018, China
| | - Hujun Shen
- Guizhou Provincial
Key Laboratory of Computational Nano-Material Science, Guizhou Education University, Guiyang 550018, China
| | - Zhenzhen Feng
- Institute for Computational Materials Science, School
of Physics and Electronics, Henan University, Kaifeng 475004, China
| | - Hang Li
- Institute for Computational Materials Science, School
of Physics and Electronics, Henan University, Kaifeng 475004, China
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23
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Tunable Electronic Properties of Type-II SiS 2/WSe 2 Hetero-Bilayers. NANOMATERIALS 2020; 10:nano10102037. [PMID: 33076468 PMCID: PMC7602600 DOI: 10.3390/nano10102037] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/25/2020] [Revised: 10/12/2020] [Accepted: 10/13/2020] [Indexed: 11/16/2022]
Abstract
First-principle calculations based on the density functional theory (DFT) are implemented to study the structural and electronic properties of the SiS2/WSe2 hetero-bilayers. It is found that the AB-2 stacking model is most stable among all the six SiS2/WSe2 heterostructures considered in this work. The AB-2 stacking SiS2/WSe2 hetero-bilayer possesses a type-II band alignment with a narrow indirect band gap (0.154 eV and 0.738 eV obtained by GGA-PBE and HSE06, respectively), which can effectively separate the photogenerated electron–hole pairs and prevent the recombination of the electron–hole pairs. Our results revealed that the band gap can be tuned effectively within the range of elastic deformation (biaxial strain range from −7% to 7%) while maintaining the type-II band alignment. Furthermore, due to the effective regulation of interlayer charge transfer, the band gap along with the band offset of the SiS2/WSe2 heterostructure can also be modulated effectively by applying a vertical external electric field. Our results offer interesting alternatives for the engineering of two-dimensional material-based optoelectronic nanodevices.
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24
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Ai C, Li J, Yang L, Wang Z, Wang Z, Zeng Y, Deng R, Lin S, Wang CZ. Transforming Photocatalytic g-C 3 N 4 /MoSe 2 into a Direct Z-Scheme System via Boron-Doping: A Hybrid DFT Study. CHEMSUSCHEM 2020; 13:4985-4993. [PMID: 32671990 DOI: 10.1002/cssc.202001048] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/22/2020] [Revised: 06/20/2020] [Indexed: 06/11/2023]
Abstract
Z-scheme photocatalytic systems are an ideal band alignment structure for photocatalysis because of the high separation efficiency of photo-induced carriers while simultaneously preserving the strong reduction activity of electrons and oxidation activity of holes. However, the design and construction of Z-scheme photocatalysts is challenging because of the need for appropriate energy band alignment and built-in electric field. Here, we propose a novel approach to a Z-scheme photocatalytic system using density functional theory calculations with the HSE06 hybrid functional. The undesirable type-I g-C3 N4 /MoSe2 heterojunction is transformed into a direct Z-scheme system through boron doping of g-C3 N4 (B-doped C3 N4 /MoSe2 ). Detailed analysis of the total and partial density of states, work functions and differential charge density distribution of the B-doped C3 N4 /MoSe2 heterojunction shows the proper band alignment and existence of a built-in electric field at the interface, with the direction from g-C3 N4 to MoSe2 , demonstrating a direct Z-scheme heterojunction. Further investigation on the absorption spectra reveals a large enhancement of the light absorption efficiency after boron doping. The results consistently confirm that electronic structures and photocatalytic performance can be effectively manipulated by a facile boron doping. Modulating the band alignment of heterojunctions in this way provides valuable insights for the rational design of highly efficient heterojunction-based photocatalytic systems.
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Affiliation(s)
- Changzhi Ai
- State Key Laboratory of Marine Resource Utilization in South China Sea, School of Materials Science and Engineering, Hainan University, Haikou, 570228, P. R. China
| | - Jin Li
- School of Science, Hainan University, Haikou, 570228, P. R. China
| | - Liang Yang
- State Key Laboratory of Marine Resource Utilization in South China Sea, School of Materials Science and Engineering, Hainan University, Haikou, 570228, P. R. China
| | - Zhipeng Wang
- State Key Laboratory of Marine Resource Utilization in South China Sea, School of Materials Science and Engineering, Hainan University, Haikou, 570228, P. R. China
| | - Zhao Wang
- School of Science, Hainan University, Haikou, 570228, P. R. China
| | - Yamei Zeng
- State Key Laboratory of Marine Resource Utilization in South China Sea, School of Materials Science and Engineering, Hainan University, Haikou, 570228, P. R. China
| | - Rong Deng
- State Key Laboratory of Marine Resource Utilization in South China Sea, School of Materials Science and Engineering, Hainan University, Haikou, 570228, P. R. China
| | - Shiwei Lin
- State Key Laboratory of Marine Resource Utilization in South China Sea, School of Materials Science and Engineering, Hainan University, Haikou, 570228, P. R. China
| | - Cai-Zhuang Wang
- Ames Laboratory-U. S. Department of Energy, and Department of Physics and Astronomy, Iowa State University, Ames, IA 50011, USA
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25
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Synthesis of g-C3N4/BiVO4 and Its Photocatalytic Performance for Hydrogen Production. ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING 2020. [DOI: 10.1007/s13369-020-04399-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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26
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Jiang Q, Wang H, Wei X, Wu Y, Gu W, Hu L, Zhu C. Efficient BiVO 4 photoanode decorated with Ti 3C 2T X MXene for enhanced photoelectrochemical sensing of Hg(II) ion. Anal Chim Acta 2020; 1119:11-17. [PMID: 32439049 DOI: 10.1016/j.aca.2020.04.049] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2020] [Revised: 04/18/2020] [Accepted: 04/21/2020] [Indexed: 10/24/2022]
Abstract
A highly sensitive photoelectrochemical (PEC) sensing platform was constructed for Hg2+ determination based on the Schottky heterojunction between an emerging 2D material Ti3C2TX MXene and a promising semiconductor material BiVO4. Through simply spin-coating the single-layer Ti3C2TX onto the surface of BiVO4 film, the modified electrode exhibited significantly enhanced PEC activity. However, the boost in photocurrent could be noticeably suppressed due to the consumption of hole-scavenging agents (reduced glutathione) by the added Hg2+. Owing to the selective decrease in the photocurrent with the addition of Hg2+, the PEC sensor based on BiVO4/Ti3C2TX displayed a wide linear range from 1 pM to 2 nM with the limit of detection down to 1 pM. Moreover, the PEC sensor also exhibited satisfactory accuracy and repeatability in practical sample water, the Yangtze River water, demonstrating the great potential for monitoring heavy metal ions in natural water resources.
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Affiliation(s)
- Qianqian Jiang
- Key Laboratory of Pesticide and Chemical Biology of Ministry of Education, International Joint Research Center for Intelligent Biosensing Technology and Health, College of Chemistry, Central China Normal University, Wuhan, 430079, PR China
| | - Hengjia Wang
- Key Laboratory of Pesticide and Chemical Biology of Ministry of Education, International Joint Research Center for Intelligent Biosensing Technology and Health, College of Chemistry, Central China Normal University, Wuhan, 430079, PR China
| | - Xiaoqian Wei
- Key Laboratory of Pesticide and Chemical Biology of Ministry of Education, International Joint Research Center for Intelligent Biosensing Technology and Health, College of Chemistry, Central China Normal University, Wuhan, 430079, PR China
| | - Yu Wu
- Key Laboratory of Pesticide and Chemical Biology of Ministry of Education, International Joint Research Center for Intelligent Biosensing Technology and Health, College of Chemistry, Central China Normal University, Wuhan, 430079, PR China
| | - Wenling Gu
- Key Laboratory of Pesticide and Chemical Biology of Ministry of Education, International Joint Research Center for Intelligent Biosensing Technology and Health, College of Chemistry, Central China Normal University, Wuhan, 430079, PR China.
| | - Liuyong Hu
- School of Materials Science and Engineering, Wuhan Institute of Technology, Wuhan, 430205, PR China.
| | - Chengzhou Zhu
- Key Laboratory of Pesticide and Chemical Biology of Ministry of Education, International Joint Research Center for Intelligent Biosensing Technology and Health, College of Chemistry, Central China Normal University, Wuhan, 430079, PR China.
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27
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Optoelectronic response and interfacial properties of BiOI/BiOX (X=F, Cl, Br) heterostructures based on DFT investigation. J SOLID STATE CHEM 2020. [DOI: 10.1016/j.jssc.2020.121181] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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28
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Enhanced Power Conversion Efficiency of Dye-Sensitized Solar Cells by Band Edge Shift of TiO 2 Photoanode. Molecules 2020; 25:molecules25071502. [PMID: 32224956 PMCID: PMC7181208 DOI: 10.3390/molecules25071502] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2020] [Revised: 03/24/2020] [Accepted: 03/25/2020] [Indexed: 11/24/2022] Open
Abstract
By simple soaking titanium dioxide (TiO2) films in an aqueous Na2S solution, we could prepare surface-modified photoanodes for application to dye-sensitized solar cells (DSSCs). An improvement in both the open-circuit voltage (Voc) and the fill factor (FF) was observed in the DSSC with the 5 min-soaked photoanode, compared with those of the control cell without any modification. The UV–visible absorbance spectra, UPS valence band spectra, and dark current measurements revealed that the Na2S modification led to the formation of anions on the TiO2 surface, and thereby shifted the conduction band edge of TiO2 in the negative (upward) direction, inducing an increase of 29 mV in the Voc. It was also found that the increased FF value in the surface-treated device was attributed to an elevation in the shunt resistance.
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29
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Si YH, Chen WM, Shang SK, Xia Y, Zeng XR, Zhou J, Li YY. g-C 3N 4/Pt/BiVO 4 nanocomposites for highly efficient visible-light photocatalytic removal of contaminants and hydrogen generation. NANOTECHNOLOGY 2020; 31:125706. [PMID: 31770738 DOI: 10.1088/1361-6528/ab5bc5] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Inspired by natural photosynthesis, artificial heterojunction photocatalysts have been extensively studied. Herein, a novel ternary graphitic carbon nitride/platinum/bismuth vanadate (g-C3N4/Pt/BiVO4) photocatalytic system was successfully synthesized, where Pt/BiVO4 nanosheet is anchored on the surface of layered g-C3N4, as evidenced by structural observations. Ultraviolet photoelectron spectroscopy and ultraviolet-visible diffuse reflectance spectroscopy are carried out to identify the position of the conduction band and valence band. A Z-scheme is used to interpret the superior photocatalytic performance of g-C3N4/Pt/BiVO4 and further verified by the capture of free radicals and terephthalic acid photoluminescence experiments. Compared with the g-C3N4/BiVO4 binary system, the Z-scheme g-C3N4/Pt/BiVO4 photocatalyst not only possesses enhanced carrier separation efficiency but also maintains sufficient redox properties, thus inducing superior photocatalytic activity. More importantly, the novel Z-scheme photocatalyst exhibits excellent recycle stability, which could provide inspiration for the rational design of efficient and practical photocatalysts for environmental pollution treatment. The ternary photocatalyst also exhibits significantly enhanced visible-light photocatalytic hydrogen production performance.
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Affiliation(s)
- Yun-Hui Si
- Shenzhen Key Laboratory of Special Functional Materials, Shenzhen Engineering Laboratory for Advanced Technology of Ceramics, Guangdong Research Center for Interfacial Engineering of Functional Materials, College of Materials Science and Engineering, Shenzhen University, Shenzhen 518060, People's Republic of China
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Zhang X, Wang D, Man X, Wu J, Liu Q, Qi Y, Liu Z, Zhao X, Wu J, Hao C. Influence of BiOIO3 morphology on the photocatalytic efficiency of Z-scheme BiOIO3/g-C3N4 heterojunctioned composite for Hg0 removal. J Colloid Interface Sci 2020; 558:123-136. [DOI: 10.1016/j.jcis.2019.09.077] [Citation(s) in RCA: 60] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2019] [Revised: 09/18/2019] [Accepted: 09/20/2019] [Indexed: 02/07/2023]
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31
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Liu J, Hua E. Photocatalytic properties and energy band offset of a tungsten disulfide/graphitic carbon nitride van der Waals heterojunction. RSC Adv 2020; 10:5260-5267. [PMID: 35498326 PMCID: PMC9049164 DOI: 10.1039/c9ra10213b] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2019] [Accepted: 01/28/2020] [Indexed: 11/26/2022] Open
Abstract
Semiconductor heterojunctions have higher photocatalytic performance than a single photocatalytic material. However, the energy band offset and the photocatalytic reaction mechanism of these heterojunctions remain controversial. Here, tungsten disulfide (WS2)/graphitic carbon nitride (GCN) heterojunction photocatalytic water splitting is investigated with the hybrid density functional method. The band structures and the density of states (DOS) indicate that the WS2/GCN heterojunction is a type-II heterojunction, and its valence band offset and conduction band offset are 0.27 and 0.04 eV, respectively. The differential charge density distribution and the work function calculation indicate that a built-in electric field is formed in the WS2/GCN heterojunction. The potential of the built-in electric field is 0.16 V, and its direction is from the GCN surface to the WS2 surface. The built-in electric field separates the photogenerated electrons and the holes in space, effectively improving the photocatalytic efficiency of the WS2/GCN heterojunction. Our work provides insights into the electronic properties and the photocatalytic hydrogen evolution mechanism of the WS2/GCN heterojunction. WS2/GCN heterojunction is a type-II heterostructure and its electric field separates the electrons and the holes in space.![]()
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Affiliation(s)
- Jianjun Liu
- School of Physics and Electronic Information
- Huaibei Normal University
- Huaibei
- P. R. China
- Key Laboratory of Green and Precise Synthetic Chemistry and Applications
| | - Enda Hua
- School of Physical Sciences
- University of Science and Technology of China
- Hefei 230026
- P. R. China
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32
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Li Y, Bu Y, Jiang F, Dai X, Ao JP. Fabrication of ultra-sensitive photoelectrochemical aptamer biosensor: Based on semiconductor/DNA interfacial multifunctional reconciliation via 2D-C 3N 4. Biosens Bioelectron 2019; 150:111903. [PMID: 31791875 DOI: 10.1016/j.bios.2019.111903] [Citation(s) in RCA: 35] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2019] [Revised: 11/04/2019] [Accepted: 11/17/2019] [Indexed: 12/23/2022]
Abstract
In this work, we fabricate a novel bismuth vanadate/two dimensional-carbon nitride/deoxyribonucleic acid (BiVO4/2D-C3N4/DNA) aptamer photoelectrochemical (PEC) sensor, and this sensor provides a record detection sensitivity area (5 × 10-7 μg/L - 10 μg/L) for Microcystin-LR (MC-LR). Meanwhile, except for MC-LR detection, this sensor presents highly sensitivity for tumor marker, heavy metal ion, antibiotic also by changing the DNA aptamer. Photo charge dynamic and theory calculation results reveal that 2D-C3N4 is a key material for multifunctional interface reconciliation of this PEC aptamer sensor. Firstly, it can serve as photogenerated hole oriented-transfer medium from the BiVO4 photoanode to the detective target; In addition, 2D-C3N4 with large area of π electron cloud can fix the DNA aptamer parallelly by π-π bonding with the nucleic acid in the DNA aptamer to shorten the hole transfer distance from the semiconductor to target. So that, a record MC-LR detection sensitivity has been achieved by the 2D-C3N4 modified BiVO4/DNA aptamer sensor.
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Affiliation(s)
- Yang Li
- Key Laboratory of Wide Band-Gap Semiconductor Materials and Devices, School of Microelectronics, Xidian University, Xi'an, 710071, China
| | - Yuyu Bu
- Key Laboratory of Wide Band-Gap Semiconductor Materials and Devices, School of Microelectronics, Xidian University, Xi'an, 710071, China.
| | - Fengqiu Jiang
- Key Laboratory of Wide Band-Gap Semiconductor Materials and Devices, School of Microelectronics, Xidian University, Xi'an, 710071, China
| | - Xianying Dai
- Key Laboratory of Wide Band-Gap Semiconductor Materials and Devices, School of Microelectronics, Xidian University, Xi'an, 710071, China.
| | - Jin-Ping Ao
- Key Laboratory of Wide Band-Gap Semiconductor Materials and Devices, School of Microelectronics, Xidian University, Xi'an, 710071, China
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33
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34
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Fabrication of BiVO4@g-C3N4(100) heterojunction with enhanced photocatalytic visible-light-driven activity. J SOLID STATE CHEM 2019. [DOI: 10.1016/j.jssc.2019.03.022] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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35
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Enhancement of solar cell performance through the formation of a surface dipole on polyacrylonitrile-treated TiO2 photoelectrodes. J IND ENG CHEM 2019. [DOI: 10.1016/j.jiec.2019.01.036] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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36
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Composites of BiVO4 and g-C3N4: Synthesis, Properties and Photocatalytic Decomposition of Azo Dye AO7 and Nitrous Oxide. J Inorg Organomet Polym Mater 2019. [DOI: 10.1007/s10904-019-01085-4] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
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37
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Li C, Che H, Liu C, Che G, Charpentier PA, Xu WZ, Wang X, Liu L. Facile fabrication of g-C3N4 QDs/BiVO4 Z-scheme heterojunction towards enhancing photodegradation activity under visible light. J Taiwan Inst Chem Eng 2019. [DOI: 10.1016/j.jtice.2018.10.011] [Citation(s) in RCA: 66] [Impact Index Per Article: 13.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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38
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Ojha N, Bajpai A, Kumar S. Visible light-driven enhanced CO2 reduction by water over Cu modified S-doped g-C3N4. Catal Sci Technol 2019. [DOI: 10.1039/c9cy01185d] [Citation(s) in RCA: 38] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We synthesized Cu modified S-doped g-C3N4 thin sheets using calcination followed by a wet-impregnation method. The photocatalytic activity was studied for reduction of CO2 to CO and CH4 in the presence of water and a plausible mechanism is explained.
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Affiliation(s)
- Niwesh Ojha
- Gas-Solid Interaction Laboratory
- Department of Chemical and Biochemical Engineering
- Indian Institute of Technology Patna
- Patna
- India
| | - Abhinav Bajpai
- Gas-Solid Interaction Laboratory
- Department of Chemical and Biochemical Engineering
- Indian Institute of Technology Patna
- Patna
- India
| | - Sushant Kumar
- Gas-Solid Interaction Laboratory
- Department of Chemical and Biochemical Engineering
- Indian Institute of Technology Patna
- Patna
- India
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39
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Switching charge transfer process of carbon nitride and bismuth vanadate by anchoring silver nanoparticle toward cocatalyst free water reduction. J Colloid Interface Sci 2018; 529:375-384. [DOI: 10.1016/j.jcis.2018.06.029] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2018] [Revised: 06/13/2018] [Accepted: 06/14/2018] [Indexed: 11/23/2022]
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40
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Deng L, Jiang L, Tang Q, Li H. g-C3N4 Photocatalysis Technology Application in Water Treatment. ACTA ACUST UNITED AC 2018. [DOI: 10.1088/1757-899x/392/3/032043] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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41
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Qin Z, Fang W, Liu J, Wei Z, Jiang Z, Shangguan W. Zinc-doped g-C3N4/BiVO4 as a Z-scheme photocatalyst system for water splitting under visible light. CHINESE JOURNAL OF CATALYSIS 2018. [DOI: 10.1016/s1872-2067(17)62961-9] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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42
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Deng Y, Tang L, Feng C, Zeng G, Wang J, Zhou Y, Liu Y, Peng B, Feng H. Construction of plasmonic Ag modified phosphorous-doped ultrathin g-C 3N 4 nanosheets/BiVO 4 photocatalyst with enhanced visible-near-infrared response ability for ciprofloxacin degradation. JOURNAL OF HAZARDOUS MATERIALS 2018; 344:758-769. [PMID: 29161670 DOI: 10.1016/j.jhazmat.2017.11.027] [Citation(s) in RCA: 99] [Impact Index Per Article: 16.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/19/2017] [Revised: 10/26/2017] [Accepted: 11/14/2017] [Indexed: 06/07/2023]
Abstract
To realize the full utilization of solar energy, the design of highly efficient photocatalyst with improved visible-near-infrared photocatalysis performance has attracted great attentions for environment pollutant removal. In this work, we rationally employed the surface plasmon resonance effect of metallic Ag in the phosphorus doped ultrathin g-C3N4 nanosheets (PCNS) and BiVO4 composites to construct a ternary Ag@PCNS/BiVO4 photocatalyst. It was applied for the photodegradation of ciprofloxacin (CIP), exhibiting 92.6% removal efficiency under visible light irradiation (λ>420nm) for 10mg/L CIP, and presenting enhanced photocatalytic ability than that of single component or binary nanocomposites under near-infrared light irradiation (λ>760nm). The improved photocatalytic activity of the prepared Ag@PCNS/BiVO4 nanocomposite can be attributed to the synergistic effect among the PCNS, BiVO4 and Ag, which not only improves the visible light response ability and hinders the recombination efficiency of the photogenerated electrons and holes, but also retains the strong the redox ability of the photogenerated charges. According to the trapping experiment and ESR measurements results, OH, h+ and O2- all participated in the photocatalytic degradation process. Considering the SPR effect of metallic Ag and the established local electric field around the interfaces, a dual Z-scheme electrons transfer mechanism was proposed.
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Affiliation(s)
- Yaocheng Deng
- College of Environmental Science and Engineering, Hunan University, Changsha, 410082, China; Key Laboratory of Environmental Biology and Pollution Control, Hunan University, Ministry of Education, Changsha 410082, China
| | - Lin Tang
- College of Environmental Science and Engineering, Hunan University, Changsha, 410082, China; Key Laboratory of Environmental Biology and Pollution Control, Hunan University, Ministry of Education, Changsha 410082, China.
| | - Chengyang Feng
- College of Environmental Science and Engineering, Hunan University, Changsha, 410082, China; Key Laboratory of Environmental Biology and Pollution Control, Hunan University, Ministry of Education, Changsha 410082, China
| | - Guangming Zeng
- College of Environmental Science and Engineering, Hunan University, Changsha, 410082, China; Key Laboratory of Environmental Biology and Pollution Control, Hunan University, Ministry of Education, Changsha 410082, China.
| | - Jiajia Wang
- College of Environmental Science and Engineering, Hunan University, Changsha, 410082, China; Key Laboratory of Environmental Biology and Pollution Control, Hunan University, Ministry of Education, Changsha 410082, China
| | - Yaoyu Zhou
- College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China
| | - Yani Liu
- College of Environmental Science and Engineering, Hunan University, Changsha, 410082, China; Key Laboratory of Environmental Biology and Pollution Control, Hunan University, Ministry of Education, Changsha 410082, China
| | - Bo Peng
- College of Environmental Science and Engineering, Hunan University, Changsha, 410082, China; Key Laboratory of Environmental Biology and Pollution Control, Hunan University, Ministry of Education, Changsha 410082, China
| | - Haopeng Feng
- College of Environmental Science and Engineering, Hunan University, Changsha, 410082, China; Key Laboratory of Environmental Biology and Pollution Control, Hunan University, Ministry of Education, Changsha 410082, China
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43
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Lamkhao S, Rujijanagul G, Randorn C. Fabrication of g-C 3N 4 and a promising charcoal property towards enhanced chromium(VI) reduction and wastewater treatment under visible light. CHEMOSPHERE 2018; 193:237-243. [PMID: 29136570 DOI: 10.1016/j.chemosphere.2017.11.015] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/28/2017] [Revised: 10/03/2017] [Accepted: 11/04/2017] [Indexed: 06/07/2023]
Abstract
The visible light driven photoactivity of g-C3N4 can be enhanced using charcoal as a supporter. Charcoal/g-C3N4 composite materials were prepared by the simultaneous thermal condensation of melamine and charcoal. The effect of different atmospheres (O2, air, and argon) on the reaction was investigated. The effect of different weight ratios of charcoal to melamine (1:1 and 1:4 wt%) was also investigated. The physical properties of the charcoal/g-C3N4 materials were analyzed using XRD, SEM, TEM, XPS, BET and FTIR techniques. It was found that an oxidation reaction of charcoal and g-C3N4 during preparation greatly affected the photoactivity. A composite of charcoal:melamine (1:4 wt%) prepared under an air atmosphere provided good photooxidation of methylene blue; whereas a composite of charcoal:melamine (1:4 wt%) prepared under an oxygen atmosphere exhibited good photoreduction of chromium (VI).
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Affiliation(s)
- Suphatchaya Lamkhao
- Department of Chemistry, Faculty of Science, Chiang Mai University, 50200, Thailand; Graduate School, Chiang Mai University, Chiang Mai, 50200, Thailand
| | - Gobwute Rujijanagul
- Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, 50200, Thailand
| | - Chamnan Randorn
- Department of Chemistry, Faculty of Science, Chiang Mai University, 50200, Thailand; Environmental Science Research Center (ESRC), Chiang Mai University, 50200, Thailand.
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44
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Chen L, Huang H, Zheng Y, Sun W, Zhao Y, Francis PS, Wang X. Noble-metal-free Ni3N/g-C3N4 photocatalysts with enhanced hydrogen production under visible light irradiation. Dalton Trans 2018; 47:12188-12196. [DOI: 10.1039/c8dt02456a] [Citation(s) in RCA: 47] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Noble-metal-free Ni3N/g-C3N4 heterojunctions that show high photocatalytic hydrogen evolution activity comparable to platinized g-C3N4 were successfully synthesized.
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Affiliation(s)
- Lu Chen
- State Key Laboratory of Photocatalysis on Energy and Environment
- College of Chemistry
- Fuzhou University
- Fuzhou
- China
| | - Huijuan Huang
- State Key Laboratory of Photocatalysis on Energy and Environment
- College of Chemistry
- Fuzhou University
- Fuzhou
- China
| | - Yuanhui Zheng
- State Key Laboratory of Photocatalysis on Energy and Environment
- College of Chemistry
- Fuzhou University
- Fuzhou
- China
| | - Wenhao Sun
- State Key Laboratory of Photocatalysis on Energy and Environment
- College of Chemistry
- Fuzhou University
- Fuzhou
- China
| | - Yi Zhao
- State Key Laboratory of Photocatalysis on Energy and Environment
- College of Chemistry
- Fuzhou University
- Fuzhou
- China
| | - Paul S. Francis
- Centre for Chemistry and Biotechnology
- School of Life and Environmental Sciences
- Faculty of Science
- Engineering and Built Environment
- Deakin University
| | - Xuxu Wang
- State Key Laboratory of Photocatalysis on Energy and Environment
- College of Chemistry
- Fuzhou University
- Fuzhou
- China
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45
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Ma X, Wei Y, Wei Z, He H, Huang C, Zhu Y. Probing π-π stacking modulation of g-C3N4/graphene heterojunctions and corresponding role of graphene on photocatalytic activity. J Colloid Interface Sci 2017; 508:274-281. [DOI: 10.1016/j.jcis.2017.08.037] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2017] [Revised: 08/10/2017] [Accepted: 08/11/2017] [Indexed: 02/09/2023]
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46
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Yu M, Zhou S, Meng Q, Lv H, Chen Z, Zhang Y, Jin M, Yuan M, Wang X, Zhou G. Synergistic Effects of Ag Nanoparticles/BiV 1-xMo xO 4 with Enhanced Photocatalytic Activity. NANOSCALE RESEARCH LETTERS 2017; 12:588. [PMID: 29124414 PMCID: PMC5680395 DOI: 10.1186/s11671-017-2345-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/18/2017] [Accepted: 10/18/2017] [Indexed: 06/07/2023]
Abstract
In recent years, BiVO4 has drawn much attention as a novel photocatalyst given its excellent ability to absorb visible light. This work reports the development of Ag-modified BiV1-xMoxO4 composites through a facile hydrothermal synthesis with the subsequent photoinduced reduction of Ag+ at almost neutral pH conditions. Metallic Ag nanoparticles were deposited on the (040) facet of Mo-doped BiVO4 powders. The crystal structure and morphology of the as-prepared samples were studied by XRD and SEM analyses. Moreover, the photocatalytic performance of BiVO4, Ag/BiVO4, and Ag-modified BiV1-xMoxO4 were evaluated by the degradation of rhodamine B (RhB). The Ag/BiV0.9925Mo0.0075O4 composite exhibited the most efficient photocatalytic performance. The present work provides greater insight into the application of BiVO4 in the field of photocatalysis.
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Affiliation(s)
- Mengting Yu
- South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou, Guangdong Province China
| | - Shixiong Zhou
- South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou, Guangdong Province China
| | - Qingguo Meng
- Shenyang Institute of Automation, Chinese Academy of Sciences, Guangzhou, 511458 China
| | - Haiqin Lv
- Shenyang Institute of Automation, Chinese Academy of Sciences, Guangzhou, 511458 China
| | - Zhihong Chen
- Shenyang Institute of Automation, Chinese Academy of Sciences, Guangzhou, 511458 China
- International Academy of Optoelectronics at Zhaoqing, South China Normal University, Guangzhou, Guangdong Province China
| | - Yongguang Zhang
- International Academy of Optoelectronics at Zhaoqing, South China Normal University, Guangzhou, Guangdong Province China
| | - Mingliang Jin
- South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou, Guangdong Province China
- International Academy of Optoelectronics at Zhaoqing, South China Normal University, Guangzhou, Guangdong Province China
| | - Mingzhe Yuan
- Shenyang Institute of Automation, Chinese Academy of Sciences, Guangzhou, 511458 China
| | - Xin Wang
- South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou, Guangdong Province China
- International Academy of Optoelectronics at Zhaoqing, South China Normal University, Guangzhou, Guangdong Province China
| | - Guofu Zhou
- South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou, Guangdong Province China
- International Academy of Optoelectronics at Zhaoqing, South China Normal University, Guangzhou, Guangdong Province China
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47
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Wang Y, Sun J, Li J, Zhao X. Electrospinning Preparation of Nanostructured g-C 3N 4/BiVO 4 Composite Films with an Enhanced Photoelectrochemical Performance. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:4694-4701. [PMID: 28434233 DOI: 10.1021/acs.langmuir.7b00893] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Nanostructured g-C3N4/BiVO4 composite films with an enhanced photoelectrochemical (PEC) performance have been fabricated via the facile electrospinning technique. The g-C3N4 nanosheets can not only form heterojunctions with BiVO4 but also prevent the agglomeration of BiVO4, helping the formation of nanostructures. The as-prepared g-C3N4/BiVO4 films exhibit good coverage and stability. The PEC performance of the g-C3N4/BiVO4 films is much more enhanced compared with that for individual BiVO4 films because of the enhanced electron-hole separation. The photocurrent density is 0.44 mA/cm2 for g-C3N4/BiVO4 films at 0.56 V in the linear sweep current-voltage test, over 10 times higher than that of individual BiVO4 films (0.18 mA/cm2). The effects of the preparation conditions including the g-C3N4 content, collector temperature, calcination temperature, and electrospinning time on the PEC performance were investigated, and the reasons for the effects were proposed. The optimal preparation condition was with 3.9 wt % g-C3N4 content in the electrospinning precursor, 185 °C collector temperature, 450 °C calcination temperature, and 40 min electrospinning time. The excellent PEC performance and the facile preparation method suggest that the g-C3N4/BiVO4 films are good candidates in energy and environmental remediation area.
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Affiliation(s)
- Yan Wang
- Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences , Beijing 100085, P. R. China
| | - Jianyang Sun
- Zhejiang University of Technology, College of Environment , Hangzhou, Zhejiang 310032, P. R. China
| | - Jiang Li
- Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences , Beijing 100085, P. R. China
| | - Xu Zhao
- Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences , Beijing 100085, P. R. China
- University of Chinese Academy of Sciences , Beijing 100049, P. R. China
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48
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Chen SH, Wang JJ, Huang J, Li QX. g-C3N4/SnS2 Heterostructure: a Promising Water Splitting Photocatalyst. CHINESE J CHEM PHYS 2017. [DOI: 10.1063/1674-0068/30/cjcp1605113] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
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49
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Pan H, Meng X, Qi X, Qin G. Electronic and optical properties of MoS2/α-Fe2O3(0001) heterostructures: a first-principles investigation. CrystEngComm 2017. [DOI: 10.1039/c7ce01260h] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
This study investigates the effect of interfacial structure of MoS2/α-Fe2O3(0001) heterostructure on its photocatalytic activity.
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Affiliation(s)
- Haijun Pan
- School of Resources and Materials
- Northeastern University at Qinhuangdao
- Qinhuangdao 066004
- People's Republic of China
- Key Laboratory for Anisotropy and Texture of Materials
| | - Xiangying Meng
- College of Sciences
- Northeastern University
- Shenyang 110819
- People's Republic of China
| | - Xiwei Qi
- School of Resources and Materials
- Northeastern University at Qinhuangdao
- Qinhuangdao 066004
- People's Republic of China
- Hebei Provincial Laboratory for Dielectric and Electrolyte Functional Materials
| | - Gaowu Qin
- Key Laboratory for Anisotropy and Texture of Materials
- Northeastern University
- Shenyang 110819
- People's Republic of China
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50
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Nguyen CC, Dinh CT, Do TO. Hollow Sr/Rh-codoped TiO2 photocatalyst for efficient sunlight-driven organic compound degradation. RSC Adv 2017. [DOI: 10.1039/c6ra25987a] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Sunlight-driven photocatalysis has emerged as a potential technology to address organic pollutant issues.
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Affiliation(s)
| | - Cao-Thang Dinh
- Department of Electrical and Computer Engineering
- University of Toronto
- Toronto
- Canada
| | - Trong-On Do
- Department of Chemical Engineering
- Laval University
- Quebec
- Canada
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