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Wang A, Chen J, An X, Chi H, Yao T, Li C. Phase-Stabilized Nickel-Molybdenum Electrocatalyst by Samarium Doping for Hydrogen Evolution in Alkaline Water Electrolysis. SMALL METHODS 2024:e2400207. [PMID: 38801030 DOI: 10.1002/smtd.202400207] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/08/2024] [Revised: 05/07/2024] [Indexed: 05/29/2024]
Abstract
Although the nickel-molybdenum electrocatalyst exhibits excellent activity in the alkaline hydrogen evolution reaction (HER), its stability is poor mainly due to molybdenum leaching. This work reports that doping samarium into nickel-molybdenum electrocatalyst effectively suppresses molybdenum leaching by forming a stable phase consisting of Sm, Mo, and O elements. The resulting electrode displays no noticeable activity degradation during the long-term testing (> 850 h) under a current density of 500 mA cm-2 in 1 м KOH. This enhanced stability is ascribed to the formation of a robust phase within the HER potential windows in alkaline electrolytes, as evidenced by the Pourbaix diagram. Furthermore, the samarium-modified electrocatalyst exhibits increased activity, with the overpotential decreasing by ≈59 mV from 159 to 100 mV at 500 mA cm-2 compared to the unmodified counterpart. These remarkable properties stem from samarium doping, which not only facilitates the formation of a stable phase to inhibit molybdenum leaching but also adjusts the electronic properties of molybdenum to enhance water dissociation.
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Affiliation(s)
- Aoqi Wang
- School of Chemistry and Materials Science, University of Science and Technology of China, Hefei, 230026, China
- State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, China
| | - Jun Chen
- State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, China
- University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Xiurui An
- State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, China
- University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Haibo Chi
- School of Chemistry and Materials Science, University of Science and Technology of China, Hefei, 230026, China
- State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, China
| | - Tingting Yao
- State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, China
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Can Li
- School of Chemistry and Materials Science, University of Science and Technology of China, Hefei, 230026, China
- State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, China
- University of Chinese Academy of Sciences, Beijing, 100049, China
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Qin Y, Zhang L, Yang B, Hou R, Fu G, Huang T, Deng R, Zhang S, Meng X. Molten salt synthesis of 1T/2H mixed phase MoS 2 for boosting photocatalytic H 2 evolution via Schottky junction under EY-sensitized system. J Colloid Interface Sci 2024; 660:617-627. [PMID: 38266343 DOI: 10.1016/j.jcis.2024.01.107] [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: 12/05/2023] [Revised: 01/01/2024] [Accepted: 01/14/2024] [Indexed: 01/26/2024]
Abstract
Clean H2 fuel obtained from the photocatalytic water splitting to hydrogen reaction could efficiently alleviate current energy crisis and the concomitant environmental pollution problems. Therefore, it is desirable to search for a highly efficient photocatalytic system to decrease the energy barrier of water splitting reaction. Herein, the 1T/2H mixed phase MoS2 sample with Schottky junction between contact interfaces is developed through molten salt synthesis for photocatalytic hydrogen production under a dye-sensitized system (Eosin Y-TEOA-MoS2) driven by the visible light. In mixed phase MoS2 sample, the photogenerated electrons of 2H-phase MoS2 migrated to the 1T-phase MoS2 are difficult to jump back because of the existence of Schottky barrier, which greatly suppresses the quenching of EY and therefore results in an enhanced hydrogen evolution performance. Therefore, the optimized MoS2 sample (MoS2-350) has an initial hydrogen evolution rate of 213 μmol h-1 and corresponding apparent quantum yield of 36.1 % at 420 nm, far higher than those of pure Eosin Y. It is strongly confirmed by the steady-state/time-resolved photoluminescence (PL) spectra and transient photocurrent response experiments. With the assistance of Density functional theory (DFT) calculation, the function of Schottky junction in photocatalytic hydrogen evolution reaction is well explained. In addition, a new and universal method (SVM curve) of judging oxidation or reduction quenching for photosensitizers is proposed.
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Affiliation(s)
- Yibo Qin
- School of Chemistry & Chemical Engineering, Henan University of Science and Technology, Luoyang, Henan 471023, China
| | - Leilei Zhang
- Henan Provincial Key Laboratory of Nanocomposites and Applications, Institute of Nanostructured Functional Materials, Huanghe Science and Technology College, Zhengzhou, Henan 450006, China
| | - Baocheng Yang
- Henan Provincial Key Laboratory of Nanocomposites and Applications, Institute of Nanostructured Functional Materials, Huanghe Science and Technology College, Zhengzhou, Henan 450006, China
| | - Ruipeng Hou
- Henan Provincial Key Laboratory of Nanocomposites and Applications, Institute of Nanostructured Functional Materials, Huanghe Science and Technology College, Zhengzhou, Henan 450006, China
| | - Gaoliang Fu
- Henan Provincial Key Laboratory of Nanocomposites and Applications, Institute of Nanostructured Functional Materials, Huanghe Science and Technology College, Zhengzhou, Henan 450006, China
| | - Tengfei Huang
- Henan Provincial Key Laboratory of Nanocomposites and Applications, Institute of Nanostructured Functional Materials, Huanghe Science and Technology College, Zhengzhou, Henan 450006, China
| | - Ruixue Deng
- School of Chemistry & Chemical Engineering, Henan University of Science and Technology, Luoyang, Henan 471023, China.
| | - Shouren Zhang
- Henan Provincial Key Laboratory of Nanocomposites and Applications, Institute of Nanostructured Functional Materials, Huanghe Science and Technology College, Zhengzhou, Henan 450006, China.
| | - Xiangyu Meng
- Henan Provincial Key Laboratory of Nanocomposites and Applications, Institute of Nanostructured Functional Materials, Huanghe Science and Technology College, Zhengzhou, Henan 450006, China.
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Sakthi Priya T, Nataraj N, Chen TW, Chen SM, Kokulnathan T. Synergistic formation of samarium oxide/graphene nanocomposite: A functional electrocatalyst for carbendazim detection. CHEMOSPHERE 2022; 307:135711. [PMID: 35843428 DOI: 10.1016/j.chemosphere.2022.135711] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/25/2022] [Revised: 06/28/2022] [Accepted: 07/11/2022] [Indexed: 06/15/2023]
Abstract
Herein, an electrochemical sensor based on samarium oxide anchored, reduced graphene oxide (Sm2O3/RGO) nanocomposite was developed for the rapid detection of carbendazim (CBZ). Different characterization methods were infused to deeply examine the morphology, composition, and elemental state of Sm2O3/RGO nanocomposite. The Sm2O3/RGO modified electrode exhibits an excellent electro-catalytic performance toward CBZ detection with a peak potential of +1.04 V in phosphate buffer solution (pH 3.0), which is superior to the RGO-, Sm2O3- and bare- electrodes. This remarkable activity can be credited to the synergetic effect generated by the robust interaction between Sm2O3 and RGO, resulting in a well-enhanced electrochemical sensing ability. Impressively, the fabricated sensor shows improved electrochemical performance in terms of the wide working range, detection limit, and strong sensitivity. On a peculiar note, the electrochemical sensing performances of CBZ detection based on Sm2O3/RGO nanocomposite demonstrate an extraordinary behavior compared to the prior documented electro-catalyst. In addition, the fabricated Sm2O3/RGO sensor also displays good operational stability, reproducibility, and repeatability towards the detection of CBZ. Furthermore, it was successfully applied to the CBZ detection in food and environmental water samples with satisfactory recovery. In accordance with our research findings, the Sm2O3/RGO nanocomposite could be used as an electro-active material for effectual electrochemical sensing of food and environmental pollutants.
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Affiliation(s)
- Thangavelu Sakthi Priya
- Department of Chemical Engineering and Biotechnology, National Taipei University of Technology, Taipei, 106, Taiwan
| | - Nandini Nataraj
- Department of Chemical Engineering and Biotechnology, National Taipei University of Technology, Taipei, 106, Taiwan
| | - Tse-Wei Chen
- Department of Chemical Engineering and Biotechnology, National Taipei University of Technology, Taipei, 106, Taiwan; Research and Development Center for Smart Textile Technology, National Taipei University of Technology, Taipei, 106, Taiwan; Department of Materials, Imperial College London, London, SW7 2AZ, United Kingdom
| | - Shen-Ming Chen
- Department of Chemical Engineering and Biotechnology, National Taipei University of Technology, Taipei, 106, Taiwan.
| | - Thangavelu Kokulnathan
- Department of Chemical Engineering and Biotechnology, National Taipei University of Technology, Taipei, 106, Taiwan; Department of Electro-Optical Engineering, National Taipei University of Technology, Taipei, 106, Taiwan
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Hu Y, Zhan W, Wu Z, Tang Y, Huang Y, Ding XT, Chen D. Poly(styrene‐alt‐maleic anhydride) ionic salt functionalized reduced graphene oxide doped with rare earth ions for anti‐corrosion performance enhancement. J Appl Polym Sci 2021. [DOI: 10.1002/app.50666] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Yue Hu
- Department of material engineering, Jiangsu Key Laboratory of Functional Materials Changshu Institute of Technology Changshu China
- Chemical Engineering and Material Science, College of Chemistry Soochow University Suzhou China
| | - Weiwu Zhan
- Department of material engineering, Jiangsu Key Laboratory of Functional Materials Changshu Institute of Technology Changshu China
- Chemical Engineering and Material Science, College of Chemistry Soochow University Suzhou China
| | - Zhifeng Wu
- Department of material engineering, Jiangsu Key Laboratory of Functional Materials Changshu Institute of Technology Changshu China
| | - Yanreng Tang
- Department of material engineering, Jiangsu Key Laboratory of Functional Materials Changshu Institute of Technology Changshu China
| | - Yangdi Huang
- Department of material engineering, Jiangsu Key Laboratory of Functional Materials Changshu Institute of Technology Changshu China
| | - Xu Te Ding
- Department of material engineering, Jiangsu Key Laboratory of Functional Materials Changshu Institute of Technology Changshu China
| | - Dianyu Chen
- Department of material engineering, Jiangsu Key Laboratory of Functional Materials Changshu Institute of Technology Changshu China
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Raza A, Qumar U, Haider A, Naz S, Haider J, Ul-Hamid A, Ikram M, Ali S, Goumri-Said S, Kanoun MB. Liquid-phase exfoliated MoS 2 nanosheets doped with p-type transition metals: a comparative analysis of photocatalytic and antimicrobial potential combined with density functional theory. Dalton Trans 2021; 50:6598-6619. [PMID: 33899890 DOI: 10.1039/d1dt00236h] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
MoS2 nanosheets were developed by undertaking the liquid-phase exfoliation of bulk counterparts. In order to enhance its photocatalytic properties, the host material was doped with p-type transition metals (i.e., Ag, Co, Bi, and Zr). The hydrothermal technique was used to produce samples doped with 7.5 wt% transition metals (TM). X-ray diffraction detected the existence of 2H-phase by mirroring its reflection at 2θ ∼ 14°, while the peak distribution revealed the degree of exfoliation in samples. Low PL intensities indicated a lower recombination of electron-hole pairs, as corroborated by a high degree of photocatalytic action. Raman analysis was undertaken to identify molecular vibrations. The A1g mode in Raman spectra consistently showed a blueshift in all samples and the E12g mode was only slightly affected, which is evidence of the p-type doping in the MoS2 nanosheets. In the XPS spectrum, two characteristic peaks of Mo 3d appeared at 229.87 and 233.03 eV assigned to Mo-3d5/2 and Mo-3d3/2, respectively. Furthermore, a microstructural examination with HR-TEM and FESEM divulged a thin-layered structure of MoS2 consisting of flat, gently curved or twisted nanosheets. Diverse morphologies were observed with a non-uniform distribution of the dopant. Photocatalytic action of the TM-doped products effectively degraded methylene blue (MB) concentrations of up to 94 percent (for Ag-MoS2). The synergistic effect of doped MoS2 nanosheets against S. aureus in comparison to E. coli bacteria was also evaluated. The efficacy % age improved from (0-31.7%) and (23.5-55.2%) against E. coli, and (0-34.2%) and (8.3-69.23%) against S. aureus. Moreover, results from first principles calculations indicate that substitutional doping of TM atoms is indeed advantageous. Theoretical calculations confirmed that doping with Ag, Co, Bi, and Zr leads to a decrease in the band gap to a certain degree, in which the conduction band edge shifts toward lower energy, while the valence band shifts closer to the high energy end. It can be concluded that Ag, Co, and Bi impurities can lead to beneficial p-type doping in MoS2 monolayered structures. With regards to doping with Zr, the acceptor levels are formed above the edge of the valence band, revealing an introduction of the p-type character.
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Affiliation(s)
- Ali Raza
- Department of Physics, Riphah Institute of Computing and Applied Sciences (RICAS), Riphah International University, 14 Ali Road, Lahore, Pakistan
| | - Usman Qumar
- Department of Physics, Riphah Institute of Computing and Applied Sciences (RICAS), Riphah International University, 14 Ali Road, Lahore, Pakistan
| | - Ali Haider
- Department of Clinical Medicine and Surgery, University of Veterinary and Animal Sciences, Lahore 54000, Punjab, Pakistan
| | - Sadia Naz
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin 300308, China
| | - Junaid Haider
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin 300308, China
| | - Anwar Ul-Hamid
- Core Research Facilities, King Fahd University of Petroleum & Minerals, Dhahran, 31261, Saudi Arabia
| | - Muhammad Ikram
- Solar Cell Applications Research Lab, Department of Physics, Government College University Lahore, 54000, Punjab, Pakistan.
| | - Salamat Ali
- Department of Physics, Riphah Institute of Computing and Applied Sciences (RICAS), Riphah International University, 14 Ali Road, Lahore, Pakistan
| | - Souraya Goumri-Said
- College of Science, Physics Department, Alfaisal University, P.O. Box 50927, Riyadh 11533, Saudi Arabia
| | - Mohammed Benali Kanoun
- Department of Physics, College of Science, King Faisal University, P.O. Box 400, Al-Ahsa, 31982, Saudi Arabia.
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Liu Y, Sun Y, Xu J, Mao M, Li X. A Z-scheme heterostructure constructed from ZnS nanospheres and Ni(OH)2 nanosheets to enhance the photocatalytic hydrogen evolution. NEW J CHEM 2021. [DOI: 10.1039/d1nj00465d] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
ZnS and Ni(OH)2 form a Z-scheme heterostructure, and the synergy between them provides a new hydrogen-producing active center for each material.
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Affiliation(s)
- Ye Liu
- School of Chemistry and Chemical Engineering
- North Minzu University
- Yinchuan 750021
- P. R. China
| | - Yanpu Sun
- School of Chemistry and Chemical Engineering
- Ningxia University
- Yinchuan 750021
- P. R. China
| | - Jing Xu
- School of Chemistry and Chemical Engineering
- North Minzu University
- Yinchuan 750021
- P. R. China
- Key Laboratory of Chemical Engineering and Technology (North Minzu University)
| | - Min Mao
- School of Chemistry and Chemical Engineering
- North Minzu University
- Yinchuan 750021
- P. R. China
| | - Xuanhao Li
- School of Chemistry and Chemical Engineering
- North Minzu University
- Yinchuan 750021
- P. R. China
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7
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Graphene quantum dots synthesized by green method regulate electron transport on the surface of hollow spherical NiCo2S4 for efficient photocatalytic H2 evolution. J SOLID STATE CHEM 2020. [DOI: 10.1016/j.jssc.2020.121428] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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Xu J, Mao M, Yu H. Functionalization of sheet structure Co–Mo–S with Ni(OH)2 for efficient photocatalytic hydrogen evolution. RESEARCH ON CHEMICAL INTERMEDIATES 2020. [DOI: 10.1007/s11164-019-04065-y] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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9
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Raza A, Ikram M, Aqeel M, Imran M, Ul-Hamid A, Riaz KN, Ali S. Enhanced industrial dye degradation using Co doped in chemically exfoliated MoS2 nanosheets. APPLIED NANOSCIENCE 2019. [DOI: 10.1007/s13204-019-01239-3] [Citation(s) in RCA: 62] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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Li L, Xu J, Ma J, Liu Z, Li Y. A bimetallic sulfide CuCo 2S 4 with good synergistic effect was constructed to drive high performance photocatalytic hydrogen evolution. J Colloid Interface Sci 2019; 552:17-26. [PMID: 31100687 DOI: 10.1016/j.jcis.2019.05.036] [Citation(s) in RCA: 36] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2019] [Revised: 05/10/2019] [Accepted: 05/10/2019] [Indexed: 11/16/2022]
Abstract
In order to further improve the photocatalytic performance of the semiconductor photocatalyst, a photocatalytic hydrogen production performance was measured using a bimetallic sulfide photocatalyst. On this basis, the hydrogen production performance of the bimetallic sulfide CuCo2S4 (CCS-3) was compared with that of the single metal sulfides Cu31S16 and CoS2. The results showed that the bimetallic sulfide CCS-3 significantly improved the photocatalytic hydrogen production performance. The unique structure of the bimetallic sulfide CCS-3 made the photocatalytic activity of H2 2.47 times and 178.08 times higher than that of Cu31S16 and CoS2, respectively. In addition, the hydrogen production activity in CCS-3 was also very stable after XRD comparison before and after the reaction. The results of UV-visible diffuse reflectance spectroscopy showed that the visible light response range was significantly expanded, and the forbidden band width was smaller than that of Cu31S16 and CoS2. Photoluminescence spectroscopy results showed that CCS-3 had the best quenching effect because of its unique structure, which improved the separation efficiency and electron transfer efficiency of photogenerated electrons and holes. This article demonstrated new design strategies that would bring new insights into hydrogen evolution photocatalysts.
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Affiliation(s)
- Lingjiao Li
- School of Chemistry and Chemical Engineering, North Minzu University, Yinchuan 750021, PR China
| | - Jing Xu
- School of Chemistry and Chemical Engineering, North Minzu University, Yinchuan 750021, PR China; Ningxia Key Laboratory of Solar Chemical Conversion Technology, North Minzu University, Yinchuan 750021, PR China; Key Laboratory for Chemical Engineering and Technology, State Ethnic Affairs Commission, North Minzu University, Yinchuan 750021, PR China
| | - JinPing Ma
- School of Chemistry and Chemical Engineering, North Minzu University, Yinchuan 750021, PR China
| | - Zeying Liu
- School of Chemistry and Chemical Engineering, North Minzu University, Yinchuan 750021, PR China
| | - Yanru Li
- School of Chemistry and Chemical Engineering, North Minzu University, Yinchuan 750021, PR China
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Liu Z, Xu J, Liao Q, Li Y, Li L, Mao M. Synthesis of Sm2MoO6/Ni(OH)2 by Simple Impregnation Method: Photocatalyst for Non-precious Metal and Efficient Hydrogen Production. Catal Letters 2019. [DOI: 10.1007/s10562-019-02947-9] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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12
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Li L, Yu H, Xu J, Zhao S, Liu Z, Li Y. Rare earth element, Sm, modified graphite phase carbon nitride heterostructure for photocatalytic hydrogen production. NEW J CHEM 2019. [DOI: 10.1039/c8nj05619f] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A new type of Sm2O3@Ni7S6/g-C3N4 composite has high photocatalytic activity and stability.
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Affiliation(s)
- Lingjiao Li
- School of Chemistry and Chemical Engineering
- North Minzu University
- Yinchuan 750021
- People's Republic of China
| | - Hai Yu
- School of Chemistry and Chemical Engineering
- North Minzu University
- Yinchuan 750021
- People's Republic of China
| | - Jing Xu
- School of Chemistry and Chemical Engineering
- North Minzu University
- Yinchuan 750021
- People's Republic of China
- Key Laboratory of Chemical Engineering & Technology
| | - Sheng Zhao
- School of Chemistry and Chemical Engineering
- North Minzu University
- Yinchuan 750021
- People's Republic of China
| | - Zeying Liu
- School of Chemistry and Chemical Engineering
- North Minzu University
- Yinchuan 750021
- People's Republic of China
| | - Yanru Li
- School of Chemistry and Chemical Engineering
- North Minzu University
- Yinchuan 750021
- People's Republic of China
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High Performance Photocatalytic Based on Ce Doped CoWO4: Controllable Synthesis and Enhanced Photocatalytic Activity. Catal Letters 2018. [DOI: 10.1007/s10562-018-2518-x] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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14
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Abinaya R, Archana J, Harish S, Navaneethan M, Ponnusamy S, Muthamizhchelvan C, Shimomura M, Hayakawa Y. Ultrathin layered MoS2 nanosheets with rich active sites for enhanced visible light photocatalytic activity. RSC Adv 2018; 8:26664-26675. [PMID: 35541077 PMCID: PMC9083125 DOI: 10.1039/c8ra02560f] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2018] [Accepted: 05/24/2018] [Indexed: 01/12/2023] Open
Abstract
Edge-rich active sites of ultrathin layered molybdenum disulphide (MoS2) nanosheets were synthesized by a hydrothermal method. The effect of pH on the formation of MoS2 nanosheets and their photocatalytic response have been investigated. Structural and elemental analysis confirm the presence of S–Mo–S in the composition. Morphological analysis confirms the presence of ultrathin layered nanosheets with a sheet thickness of 10–28 nm at pH 1. The interplanar spacing of MoS2 layers is in good agreement with the X-ray diffraction and high-resolution transmission electron microscopy results. A comparative study of the photocatalytic performance for the degradation of methylene blue (MB) and rhodamine B (RhB) by ultrathin layered MoS2 under visible light irradiation was performed. The photocatalytic activity of the edge-rich ultrathin layered nanosheets showed a fast response time of 36 min with the degradation rate of 95.3% of MB and 41.1% of RhB. The photocatalytic degradation of MB was superior to that of RhB because of the excellent adsorption of MB than that of RhB. Photogenerated superoxide radicals were the key active species for the decomposition of organic compounds present in water, as evidenced by scavenger studies. Edge-rich active sites of ultrathin layered molybdenum disulphide (MoS2) nanosheets were synthesized by a hydrothermal method.![]()
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Affiliation(s)
- R. Abinaya
- Center for Material Science and Nanodevices
- Department of Physics and Nanotechnology
- SRM Institute of Science and Technology
- India
- Graduate School of Science and Technology
| | - J. Archana
- Center for Material Science and Nanodevices
- Department of Physics and Nanotechnology
- SRM Institute of Science and Technology
- India
- SRM Research Institute
| | - S. Harish
- Research Institute of Electronics
- Shizuoka University
- Hamamatsu
- Japan
| | - M. Navaneethan
- Center for Material Science and Nanodevices
- Department of Physics and Nanotechnology
- SRM Institute of Science and Technology
- India
- SRM Research Institute
| | - S. Ponnusamy
- Center for Material Science and Nanodevices
- Department of Physics and Nanotechnology
- SRM Institute of Science and Technology
- India
| | - C. Muthamizhchelvan
- Center for Material Science and Nanodevices
- Department of Physics and Nanotechnology
- SRM Institute of Science and Technology
- India
| | - M. Shimomura
- Graduate School of Science and Technology
- Shizuoka University
- Hamamatsu
- Japan
| | - Y. Hayakawa
- Research Institute of Electronics
- Shizuoka University
- Hamamatsu
- Japan
- Graduate School of Science and Technology
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