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Jia J, Luo Y, Wu H, Wang Y, Jia X, Wan J, Dang Y, Liu G, Xie H, Zhang Y. Nickel selenide/g-C 3N 4 heterojunction photocatalyst promotes CC coupling for photocatalytic CO 2 reduction to ethane. J Colloid Interface Sci 2024; 658:966-975. [PMID: 38157620 DOI: 10.1016/j.jcis.2023.12.126] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2023] [Revised: 12/07/2023] [Accepted: 12/19/2023] [Indexed: 01/03/2024]
Abstract
Photocatalytic CO2 reduction to generate high value-added and renewable chemicals is of great potential in facilitating the realization of closed-loop and carbon-neutral hydrogen economy. Stabilizing and accelerating the formation of COCO* intermediate is crucial to achieve high-selectivity ethane production. Herein, a novel 3D/2D NiSe2/g-C3N4 heterostructure that mesoscale hedgehog nickel selenide (NiSe2) grown on the ultrathin g-C3N4 nanosheets were synthesized via a successively high temperature calcination process and in-situ thermal injection method for the first time. The optimum 2.7 % NiSe2/g-C3N4 heterostructure achieved moderate C2H6 generation rate of 46.1 μmol·g-1·h-1 and selectivity of 97.5 % without any additional photosensitizers and sacrificial agents under light illumination. Based on the results of the theoretical calculations and experiments, the improvement of photocatalytic CO2 to C2H6 production and selectivity should be ascribed to the increased visible light absorption ability, unique 3D/2D heterostructures with promoted adsorption of CO2 molecules on the Ni active sites, the type II heterojunction with improved charge transfer dynamics and lowered interfacial transfer resistance, as well as the formation of COCO* key intermediate. This work provides an inspiration to construct efficient photocatalysts for the direct transformation of CO2 to multicarbon products (C2+).
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Affiliation(s)
- Jia Jia
- College of Chemistry and Chemical Engineering, Xi'an University of Science and Technology, Xi'an 710054, PR China.
| | - Yizi Luo
- College of Chemistry and Chemical Engineering, Xi'an University of Science and Technology, Xi'an 710054, PR China
| | - Hongju Wu
- College of Chemistry and Chemical Engineering, Xi'an University of Science and Technology, Xi'an 710054, PR China
| | - Ying Wang
- Xi'an jierui Fire Science & Technology Co. Ltd., Xi'an 710054, PR China
| | - Xinyu Jia
- College of Chemistry and Chemical Engineering, Xi'an University of Science and Technology, Xi'an 710054, PR China
| | - Jun Wan
- College of Chemistry and Chemical Engineering, Yan'an University, Yan'an 716000, PR China
| | - Yongqiang Dang
- College of Chemistry and Chemical Engineering, Xi'an University of Science and Technology, Xi'an 710054, PR China
| | - Guoyang Liu
- College of Chemistry and Chemical Engineering, Xi'an University of Science and Technology, Xi'an 710054, PR China
| | - Haijiao Xie
- Hangzhou Yanqu Information Technology Co., Ltd., Zhejiang 310003, PR China
| | - Yating Zhang
- College of Chemistry and Chemical Engineering, Xi'an University of Science and Technology, Xi'an 710054, PR China.
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2
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Feng K, Huang W, Fu Z, Hu X, Fan J, Liu E. Effective H2O2-Free photo-Fenton processes over ZnSe nanosheets for photocatalytic degradation of dyes and antibiotics. J Taiwan Inst Chem Eng 2022. [DOI: 10.1016/j.jtice.2022.104312] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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3
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Chen X, Sun B, Han Z, Wang Y, Han X, Xu P. Ultrathin tungsten-doped hydrogenated titanium dioxide nanosheets for solar-driven hydrogen evolution. Inorg Chem Front 2022. [DOI: 10.1039/d2qi00978a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Ultrathin tungsten-doped hydrogenated TiO2 (W-h-TiO2) nanosheets are highly efficient for photocatalytic hydrogen production by water splitting without a noble metal cocatalyst.
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Affiliation(s)
- Xiaoyu Chen
- MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, China
| | - Bojing Sun
- MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, China
| | - Zhi Han
- MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, China
| | - Yu Wang
- MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, China
| | - Xijiang Han
- MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, China
| | - Ping Xu
- MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, China
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4
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Jin P, Guan ZC, Wang HP, Wang X, Song GL, Du RG. Fabrication of CdSe/ZnIn2S4 modified TiO2 nanotube composite and its application in photoelectrochemical cathodic protection. J Electroanal Chem (Lausanne) 2022. [DOI: 10.1016/j.jelechem.2021.115884] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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5
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Quan Y, Wang G, Li D, Jin Z. CdS Reinforced with CoS X /NiCo-LDH Core-shell Co-catalyst Demonstrate High Photocatalytic Hydrogen Evolution and Durability in Anhydrous Ethanol. Chemistry 2021; 27:16448-16460. [PMID: 34519374 DOI: 10.1002/chem.202102726] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2021] [Indexed: 11/10/2022]
Abstract
At present, inefficient charge separation of single photocatalyst impedes the development of photocatalytic hydrogen evolution. In this work, the CoSX /NiCo-LDH core-shell co-catalyst was cleverly designed, which exhibit high activity and high stability of hydrogen evolution in anhydrous ethanol system when coupled with CdS. Under visible light (λ≥420 nm) irradiation, the 3 %Co/NiCo/CdS composite photocatalyst exhibits a surprisingly high photocatalytic hydrogen evolution rate of 20.67 mmol g-1 h-1 , which is 59 times than that of the original CdS. Continuous light for 20 h still showed good cycle stability. In addition, the 3 %Co/NiCo/CdS composite catalyst also shows good hydrogen evolution performance under the Na2 S/Na2 SO3 and lactic acid system. The fluorescence (PL), ultraviolet-visible diffuse reflectance (UV-vis) and photoelectrochemical tests show that the coupling of CdS and CoSX /NiCo-LDH not only accelerates the effective transfer of charges, but also greatly increases the absorption range of CdS to visible light. Therefore, the hydrogen evolution activity of the composite photocatalyst has been significantly improved. This work will provide new insights for the construction of new co-catalysts and the development of composite catalysts for hydrogen evolution in multiple systems.
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Affiliation(s)
- Yongkang Quan
- School of Chemistry and Chemical Engineering, North Minzu University, Yinchuan, 750021, P. R. China.,Ningxia Key Laboratory of Solar Chemical Conversion Technology, North Minzu University, Yinchuan, 750021, P.R.China.,Key Laboratory for Chemical Engineering and Technology, State Ethnic Affairs Commission, North Minzu University, Yinchuan, 750021, P. R. China
| | - Guorong Wang
- School of Chemistry and Chemical Engineering, North Minzu University, Yinchuan, 750021, P. R. China.,Ningxia Key Laboratory of Solar Chemical Conversion Technology, North Minzu University, Yinchuan, 750021, P.R.China.,Key Laboratory for Chemical Engineering and Technology, State Ethnic Affairs Commission, North Minzu University, Yinchuan, 750021, P. R. China
| | - Dujuan Li
- School of Chemistry and Chemical Engineering, North Minzu University, Yinchuan, 750021, P. R. China.,Ningxia Key Laboratory of Solar Chemical Conversion Technology, North Minzu University, Yinchuan, 750021, P.R.China.,Key Laboratory for Chemical Engineering and Technology, State Ethnic Affairs Commission, North Minzu University, Yinchuan, 750021, P. R. China
| | - Zhiliang Jin
- School of Chemistry and Chemical Engineering, North Minzu University, Yinchuan, 750021, P. R. China.,Ningxia Key Laboratory of Solar Chemical Conversion Technology, North Minzu University, Yinchuan, 750021, P.R.China.,Key Laboratory for Chemical Engineering and Technology, State Ethnic Affairs Commission, North Minzu University, Yinchuan, 750021, P. R. China
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6
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Ghodake GS, Kim DY, Shinde SK, Dubal DP, Yadav HM, Magotra VK. Impact of Annealing Temperature on the Morphological, Optical and Photoelectrochemical Properties of Cauliflower-like CdSe 0.6Te 0.4 Photoelectrodes; Enhanced Solar Cell Performance. Int J Mol Sci 2021; 22:11610. [PMID: 34769039 PMCID: PMC8583999 DOI: 10.3390/ijms222111610] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2021] [Revised: 10/22/2021] [Accepted: 10/25/2021] [Indexed: 11/17/2022] Open
Abstract
We are reporting on the impact of air annealing temperatures on the physicochemical properties of electrochemically synthesized cadmium selenium telluride (CdSe0.6Te0.4) samples for their application in a photoelectrochemical (PEC) solar cell. The CdSe0.6Te0.4 samples were characterized with several sophisticated techniques to understand their characteristic properties. The XRD results presented the pure phase formation of the ternary CdSe0.6Te0.4 nanocompound with a hexagonal crystal structure, indicating that the annealing temperature influences the XRD peak intensity. The XPS study confirmed the existence of Cd, Se, and Te elements, indicating the formation of ternary CdSe0.6Te0.4 compounds. The FE-SEM results showed that the morphological engineering of the CdSe0.6Te0.4 samples can be achieved simply by changing the annealing temperatures from 300 to 400 °C with intervals of 50 °C. The efficiencies (ƞ) of the CdSe0.6Te0.4 photoelectrodes were found to be 2.0% for the non-annealed and 3.1, 3.6, and 2.5% for the annealed at 300, 350, and 400 °C, respectively. Most interestingly, the PEC cell analysis indicated that the annealing temperatures played an important role in boosting the performance of the photoelectrochemical properties of the solar cells.
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Affiliation(s)
- Gajanan S. Ghodake
- Department of Biological and Environmental Science, College of Life Science and Biotechnology, Dongguk University, 32 Dongguk-ro, Biomedical Campus, Ilsandong-gu, Siksa-dong, Goyang-si 10326, Korea; (G.S.G.); (D.-Y.K.); (H.M.Y.)
| | - Dae-Young Kim
- Department of Biological and Environmental Science, College of Life Science and Biotechnology, Dongguk University, 32 Dongguk-ro, Biomedical Campus, Ilsandong-gu, Siksa-dong, Goyang-si 10326, Korea; (G.S.G.); (D.-Y.K.); (H.M.Y.)
| | - Surendra K. Shinde
- Department of Biological and Environmental Science, College of Life Science and Biotechnology, Dongguk University, 32 Dongguk-ro, Biomedical Campus, Ilsandong-gu, Siksa-dong, Goyang-si 10326, Korea; (G.S.G.); (D.-Y.K.); (H.M.Y.)
| | - Deepak P. Dubal
- School of Chemistry and Physics, Queensland University of Technology (QUT), 2 George Street, Brisbane, QLD 4001, Australia;
| | - Hemraj M. Yadav
- Department of Biological and Environmental Science, College of Life Science and Biotechnology, Dongguk University, 32 Dongguk-ro, Biomedical Campus, Ilsandong-gu, Siksa-dong, Goyang-si 10326, Korea; (G.S.G.); (D.-Y.K.); (H.M.Y.)
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7
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Feng K, Xue W, Hu X, Fan J, Liu E. Z-scheme CdSe/ZnSe heterojunction for efficient photocatalytic hydrogen evolution. Colloids Surf A Physicochem Eng Asp 2021. [DOI: 10.1016/j.colsurfa.2021.126633] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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8
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Toufanian R, Chern M, Kong VH, Dennis AM. Engineering Brightness Matched Indium Phosphide Quantum Dots. CHEMISTRY OF MATERIALS : A PUBLICATION OF THE AMERICAN CHEMICAL SOCIETY 2021; 33:1964-1975. [PMID: 34219920 PMCID: PMC8243842 DOI: 10.1021/acs.chemmater.0c03181] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
The size-dependent optoelectronic properties of semiconductor nanocrystals quantum dots (QDs) are hugely beneficial for color tunability but induce an inherent relative PL brightness mismatch in QDs emitting different colors, as larger emitters absorb more incident photons than smaller particles. Here, we examine the effect of core composition, shell composition, and shell thickness on optical properties including high energy absorption, quantum yield (QY), and the relative brightness of InP/ZnS and InP/ZnSe core/shell and InP/ZnSe/ZnS core/shell/shell QDs at different excitation wavelengths. Our analysis reveals that the presence of an intermediate ZnSe shell changes the wavelength of enhanced absorption onset and leads to highly excitation wavelength dependent QYs. Switching from commercial CdSe/ZnS to InP/ZnS reduces the brightness-mismatch between green and red emitters from 33- to 5-fold. Incorporating a 4-monolayer thick optically absorbing ZnSe shell into the QD heterostructure and heating the QDs in a solution of zinc oleate and trioctylphosphine produces InP/ZnSe/ZnS QDs that are ~10-fold brighter than their InP/ZnS counterparts. In contrast to CdSe/CdS/ZnS core/shell/shell QDs, which only photoluminesce at red wavelengths with thicker CdS shells due to their Quasi-Type II bandstructure, Type I InP/ZnSe/ZnS QDs are uniquely suited to creating a rainbow of visible-emitting, brightness matched emitters. By tailoring the thickness of the intermediate ZnSe shell, heavy metal-free, brightness-matched green and red emitters are produced. This study highlights the ability to overcome the inherent brightness mismatch seen in QDs through concerted materials design of heterostructured core/shell InP-based QDs.
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Affiliation(s)
- Reyhaneh Toufanian
- Division of Materials Science and Engineering, Boston University, Boston, MA 02215, USA
| | - Margaret Chern
- Division of Materials Science and Engineering, Boston University, Boston, MA 02215, USA
| | - Victoria H Kong
- Department of Biomedical Engineering, Boston University, Boston, MA 02215, USA
| | - Allison M Dennis
- Division of Materials Science and Engineering, Boston University, Boston, MA 02215, USA
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9
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Zhang X, Zhang X, Feng K, Hu X, Fan J, Liu E. A carbon membrane-mediated CdSe and TiO 2 nanofiber film for enhanced photoelectrochemical degradation of methylene blue. RSC Adv 2021; 11:11872-11881. [PMID: 35423737 PMCID: PMC8696456 DOI: 10.1039/d1ra01240a] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2021] [Accepted: 03/10/2021] [Indexed: 11/17/2022] Open
Abstract
In this study, a carbon membrane-mediated CdSe and TiO2 ternary film (CdSe/C/TiO2) was prepared to degrade methylene blue (MB). Carbon membrane and CdSe were introduced to the surface of a TiO2 nanofiber film via an in situ hydrothermal deposition process successively. The investigation shows that the carbon membrane not only provides a charge transfer channel to promote the transfer of electron from the conduction band of CdSe to that of TiO2, but also improves the poor conduct between the TiO2 film and electrolyte. The synergies between the carbon membrane and CdSe can make the ternary system harvest more visible light energy and facilitate the charge transfer property of TiO2. The current density of CdSe/C/TiO2 was about 9 folds higher compared with that of pure TiO2 under UV and visible light irradiations. This ternary hybrid exhibits a superior activity during the photoelectrochemical (PEC) degradation of MB, and 92.43% can be removed after 120 min irradiation, which is improved by 21.14% than that of TiO2. A CdSe/C/TiO2 nanofiber film was prepared for enhanced photoelectrochemical degradation ability, and carbon membrane as a carrier-transfer-channel could promote electron transfer.![]()
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Affiliation(s)
- Xinye Zhang
- School of Chemical Engineering, Xi'an Key Laboratory of Special Energy Materials, Northwest University Xi'an 710069 P. R. China
| | - Xueyue Zhang
- School of Chemical Engineering, Xi'an Key Laboratory of Special Energy Materials, Northwest University Xi'an 710069 P. R. China
| | - Keting Feng
- School of Chemical Engineering, Xi'an Key Laboratory of Special Energy Materials, Northwest University Xi'an 710069 P. R. China
| | - Xiaoyun Hu
- School of Physics, Northwest University Xi'an 710069 P. R. China
| | - Jun Fan
- School of Chemical Engineering, Xi'an Key Laboratory of Special Energy Materials, Northwest University Xi'an 710069 P. R. China
| | - Enzhou Liu
- School of Chemical Engineering, Xi'an Key Laboratory of Special Energy Materials, Northwest University Xi'an 710069 P. R. China
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10
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Lu C, Drichel A, Chen J, Enders F, Rokicińska A, Kuśtrowski P, Dronskowski R, Boldt K, Slabon A. Sensibilization of p-NiO with ZnSe/CdS and CdS/ZnSe quantum dots for photoelectrochemical water reduction. NANOSCALE 2021; 13:869-877. [PMID: 33355569 DOI: 10.1039/d0nr06993k] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Core/shell quantum dots (QDs) paired with semiconductor photocathodes for water reduction have rarely been implemented so far. We demonstrate the integration of ZnSe/CdS and CdS/ZnSe QDs with porous p-type NiO photocathodes for water reduction. The QDs demonstrate appreciable enhancement in water-reduction efficiency, as compared with the bare NiO. Despite their different structure, both QDs generate comparable photocurrent enhancement, yielding a 3.8- and 3.2-fold improvement for the ZnSe/CdS@NiO and CdS/ZnSe@NiO system, respectively. Unraveling the carrier kinetics at the interface of these hybrid photocathodes is therefore critical for the development of efficient photoelectrochemical (PEC) proton reduction. In addition to examining the carrier dynamics by the Mott-Schottky technique and electrochemical impedance spectroscopy (EIS), we performed theoretical modelling for the distribution density of the carriers with respect to electron and hole wave functions. The electrons are found to be delocalized through the whole shell and can directly actuate the PEC-related process in the ZnSe/CdS QDs. The holes as the more localized carriers in the core have to tunnel through the shell before injecting into the hole transport layer (NiO). Our results emphasize the role of interfacial effects in core/shell QDs-based multi-heterojunction photocathodes.
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Affiliation(s)
- Can Lu
- Institute of Inorganic Chemistry, RWTH Aachen University, Landoltweg 1, D-52056 Aachen, Germany
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11
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Spilarewicz-Stanek K, Jakimińska A, Kisielewska A, Batory D, Piwoński I. Understanding the Role of Silver Nanostructures and Graphene Oxide Applied as Surface Modification of TiO 2 in Photocatalytic Transformations of Rhodamine B under UV and Vis Irradiation. MATERIALS (BASEL, SWITZERLAND) 2020; 13:E4653. [PMID: 33086525 PMCID: PMC7603215 DOI: 10.3390/ma13204653] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/23/2020] [Revised: 10/12/2020] [Accepted: 10/14/2020] [Indexed: 11/16/2022]
Abstract
This work is focused on photocatalytic properties of titanium dioxide thin coatings modified with silver nanostructures (AgNSs) and graphene oxide (GO) sheets which were analyzed in processes of chemical transformations of rhodamine B (RhB) under ultraviolet (UV) or visible light (Vis) irradiation, respectively. UV-Vis spectroscopy was applied to analyze the changes in the RhB spectrum during photocatalytic processes, revealing decolorization of RhB solution under UV irradiation while the same process coexisting with the transformation of RhB to rhodamine 110 was observed under Vis irradiation. The novelty of this study is the elaboration of a methodology for determining the parameters characterizing the processes occurring under the Vis irradiation, which enables the comparison of photocatalysts' activity. For the first time, the method for quantification of rhodamine B transformation into rhodamine 110 in the presence of a semiconductor under visible light irradiation was proposed. Photocatalysts with various surface architectures were designed. TiO2 thin coatings were obtained by the sol-gel method. GO sheets were deposited on their surface using the dip-coating method. AgNSs were photogenerated on TiO2 or grown spontaneously on GO flakes. For characterization of obtained photocatalysts, scanning electron microscopy (SEM), X-ray diffraction (XRD) and diffuse-reflectance spectroscopy (DRS) techniques were applied. The results indicate that the surface architecture of prepared coatings does not affect the main reaction path but have an influence on the reaction rates and yields of observed processes.
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Affiliation(s)
- Kaja Spilarewicz-Stanek
- Department of Materials Technology and Chemistry, Faculty of Chemistry, University of Lodz, Pomorska 163, 90-236 Lodz, Poland
| | - Anna Jakimińska
- Faculty of Chemistry, Jagiellonian University, Gronostajowa 2, 30-387 Krakow, Poland
| | - Aneta Kisielewska
- Department of Materials Technology and Chemistry, Faculty of Chemistry, University of Lodz, Pomorska 163, 90-236 Lodz, Poland
| | - Damian Batory
- Department of Vehicles and Fundamentals in Machine Design, Lodz University of Technology, Stefanowskiego 1/15, 90-924 Lodz, Poland
| | - Ireneusz Piwoński
- Department of Materials Technology and Chemistry, Faculty of Chemistry, University of Lodz, Pomorska 163, 90-236 Lodz, Poland
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Zhang X, Fan X, Wang X, Deng T, Liu E, Chen B. Facile fabrication of Co2P/TiO2 nanotube arrays photoelectrode for efficient methylene blue degradation. Colloids Surf A Physicochem Eng Asp 2020. [DOI: 10.1016/j.colsurfa.2020.124875] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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13
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Jiang K, Wang W, Wang J, Zhu T, Yao L, Cheng Y, Wang Y, Liang Y, Fu J. Cu 2O nanoparticles sensitize TiO 2/CdS nanowire arrays to prolong charge carrier lifetime and highly enhance unassisted photoelectrochemical hydrogen generation with 4.3% efficiency. Dalton Trans 2020; 49:9282-9293. [PMID: 32578622 DOI: 10.1039/d0dt01643h] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Effective separation of charge carriers and substantial prolongation of charge carrier lifetime are two vital issues for a photoanode to achieve highly efficient photoelectrochemical (PEC) hydrogen generation. Herein, a Cu2O-nanoparticle-sensitized TiO2/CdS (TiO2/CdS/Cu2O) nanowire array photoanode is fabricated via subtly combining successive ionic layer adsorption and reaction with a chemical bath deposition method. Both the type-II band alignment with a stair-like structure and a p-n junction are integrated into this ternary photoanode. The fabricated photoanode shows a significant enhancement in the PEC H2 production with 4.3% efficiency. The measurements of light absorption, photoluminescence and electrochemical spectra undoubtedly demonstrate that the enhanced PEC H2 generation is ascribed to the remarkable enhancement of visible-light absorbing ability, efficient space charge separation and substantial prolongation of charge carrier lifetime, which are achieved by the synergetic effects of the type-II band alignment with a stair-like structure and the p-n junction. The enhanced PEC H2 generation demonstrates the potential of the TiO2/CdS/Cu2O nanowire arrays as a photoanode to efficiently convert solar energy into chemical fuels.
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Affiliation(s)
- Kangbo Jiang
- School of Science, Minzu University of China, Beijing, 100081, P. R. China.
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14
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Liang Q, Gao W, Liu C, Xu S, Li Z. A novel 2D/1D core-shell heterostructures coupling MOF-derived iron oxides with ZnIn 2S 4 for enhanced photocatalytic activity. JOURNAL OF HAZARDOUS MATERIALS 2020; 392:122500. [PMID: 32208316 DOI: 10.1016/j.jhazmat.2020.122500] [Citation(s) in RCA: 34] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/21/2020] [Revised: 03/03/2020] [Accepted: 03/07/2020] [Indexed: 06/10/2023]
Abstract
1D spindle-like iron oxides with controllable phase were synthesized by using MIL-88A-templated pyrolysis under different atmospheres, thermal annealing in N2 to obtain Fe3O4 and in air to obtain α-Fe2O3. Then, 2D/1D core-shell heterostructures (ZnIn2S4@Fe3O4 and ZnIn2S4@α-Fe2O3) were constructed by in-situ self-assembly strategy. Characterizations indicated that the 2D ultra-thin ZnIn2S4 shell with 0.3 μm was homogeneously coated on the surface of 1D Fe3O4/α-Fe2O3 core with 1 μm, and ZnIn2S4@Fe3O4 exhibited higher BET surface area (84.5 m2 g-1) compared with ZnIn2S4@α-Fe2O3 (17.8 m2 g-1), providing more exposed active sites and larger contact area. The ZnIn2S4@Fe3O4-5 showed the best photocatalytic activity of RhB degradation as compared to ZnIn2S4, Fe3O4 and ZnIn2S4@α-Fe2O3. In addition, the degradation rates of MB, BPA and MO over ZnIn2S4@Fe3O4 were much higher than that of ZnIn2S4@α-Fe2O3. The proposed photocatalytic mechanism was also discussed: the Fe3O4 as an electron acceptor caused Fe3+/Fe2+ cycle in ZnIn2S4@Fe3O4 and ZnIn2S4@α-Fe2O3 followed the Z-scheme mechanism.
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Affiliation(s)
- Qian Liang
- School of Petrochemical Engineering, Changzhou University, Changzhou 213164, PR China
| | - Wen Gao
- School of Petrochemical Engineering, Changzhou University, Changzhou 213164, PR China
| | - Changhai Liu
- School of Materials Science & Engineering, Jiangsu Collaborative Innovation Center of Photovolatic Science and Engineering, Changzhou University, Changzhou 213164, PR China.
| | - Song Xu
- School of Petrochemical Engineering, Changzhou University, Changzhou 213164, PR China
| | - Zhongyu Li
- School of Petrochemical Engineering, Changzhou University, Changzhou 213164, PR China.
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15
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Jia J, Bai X, Zhang Q, Hu X, Liu E, Fan J. Porous honeycomb-like NiSe 2/red phosphorus heteroarchitectures for photocatalytic hydrogen production. NANOSCALE 2020; 12:5636-5651. [PMID: 32101210 DOI: 10.1039/c9nr09757k] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Heterojunction construction of semiconductors with a matched bandgap can not only help promote visible light absorption but also restrain photoexcited charge carrier recombination and optimize the separation efficiency. Herein, a novel porous honeycomb-like NiSe2/RP heterostructure is reported for the first time by in situ deposition of NiSe2 nanoparticles on the surface of red phosphorus (RP). The optimized binary NiSe2/RP composite showed superior photocatalytic H2 evolution activity (1968.8 μmol g-1 h-1) from Na2S/Na2SO3 solution under solar light illumination, which was 2.32, 1.90, 1.59 and 1.21 times that of pristine RP, NiSe2, 5.3% FeS/RP and 8.1% NiS/RP, respectively. The formation process and function of various reactive oxygen species (˙OH, ˙O2- and H2O2), and the migration pathway of photocarriers are discussed in detail. Such a prominently improved photocatalytic performance could be ascribed to extended light absorption ability, massive reactive centers and lower interfacial transfer resistance, together with expedited charge separation, which arose from a successive two-electron/two-step reduction route. This study provides illuminating insights for the rational exploration and fabrication of potential photocatalytic systems with 0D/3D integrated nanoarchitecture and a multi-step electron transfer process for efficiently realizing solar energy capture and conversion.
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Affiliation(s)
- Jia Jia
- School of Chemical Engineering, Northwest University, Xi'an 710069, P. R. China.
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