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Wang B, Chen M, Lv J, Xu G, Shu X, Wu YC. Improved hydrogen evolution with SnS 2 quantum dot-incorporated black Si photocathode. Dalton Trans 2021; 50:13329-13336. [PMID: 34608916 DOI: 10.1039/d1dt02048j] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Black silicon (bSi), possessing appealing light-trapping properties and large specific surface area, ranks high among many other photocathode materials. However, the insufficient dynamics towards HER seriously bother black Si. Herein, a novel photoelectrode with ultrasmall size tin sulfide quantum dot (SnS2 QD) incorporated black silicon was employed. Nanosized SnS2 possesses numerous active sites for electrochemical reactions. Impressively, benefiting from SnS2 QDs, the downward band bending of the Si Fermi level at the interface of electrolyte becomes higher, which remarkably suppresses the recombination of photo-generated carriers, thereby facilitating the participation of photo-generated electrons in PEC-HER. As a result, the thus-designed SnS2/bSi reveals an exceptional PEC-HER activity with a positive onset potential of 0.235 V vs. reversible hydrogen electrode (RHE), a high photocurrent of 1.23 mA cm-2 at 0 V vs. RHE, and long-term stability. Besides, the saturated photocurrent of ∼41 mA cm-2 is achieved at about -0.51 V vs. RHE.
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Affiliation(s)
- Bo Wang
- School of Materials Science and Engineering, Hefei University of Technology, No. 193, Tunxi Road, Baohe District, Hefei, 230009, PR China.
| | - Ming Chen
- School of Materials Science and Engineering, Hefei University of Technology, No. 193, Tunxi Road, Baohe District, Hefei, 230009, PR China.
| | - Jun Lv
- School of Materials Science and Engineering, Hefei University of Technology, No. 193, Tunxi Road, Baohe District, Hefei, 230009, PR China. .,Key Laboratory of Advanced Functional Materials and Devices of Anhui Province, No. 193, Tunxi Road, Baohe District, Hefei, 230009, PR China
| | - Guangqing Xu
- School of Materials Science and Engineering, Hefei University of Technology, No. 193, Tunxi Road, Baohe District, Hefei, 230009, PR China. .,Key Laboratory of Advanced Functional Materials and Devices of Anhui Province, No. 193, Tunxi Road, Baohe District, Hefei, 230009, PR China
| | - Xia Shu
- School of Materials Science and Engineering, Hefei University of Technology, No. 193, Tunxi Road, Baohe District, Hefei, 230009, PR China. .,Key Laboratory of Advanced Functional Materials and Devices of Anhui Province, No. 193, Tunxi Road, Baohe District, Hefei, 230009, PR China
| | - Yu-Cheng Wu
- School of Materials Science and Engineering, Hefei University of Technology, No. 193, Tunxi Road, Baohe District, Hefei, 230009, PR China. .,Key Laboratory of Advanced Functional Materials and Devices of Anhui Province, No. 193, Tunxi Road, Baohe District, Hefei, 230009, PR China
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Sitara E, Nasir H, Mumtaz A, Ehsan MF, Sohail M, Iram S, Bukhari SAB. Efficient Photoelectrochemical Water Splitting by Tailoring MoS 2/CoTe Heterojunction in a Photoelectrochemical Cell. NANOMATERIALS (BASEL, SWITZERLAND) 2020; 10:E2341. [PMID: 33255862 PMCID: PMC7760392 DOI: 10.3390/nano10122341] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/14/2020] [Revised: 10/27/2020] [Accepted: 10/30/2020] [Indexed: 01/27/2023]
Abstract
Solar energy conversion through photoelectrochemical water splitting (PEC) is an upcoming promising technique. MoS2/CoTe heterostructures were successfully prepared and utilized for PEC studies. MoS2 and CoTe were prepared by a hydrothermal method which were then ultrasonicated with wt. % ratios of 1:3, 1:1 and 3:1 to prepare MoS2/CoTe (1:3), MoS2/CoTe (1:1) and MoS2/CoTe (3:1) heterostructure, respectively. The pure materials and heterostructures were characterized by XRD, UV-vis-DRS, SEM, XPS, PL and Raman spectroscopy. Photoelectrochemical measurements were carried out by linear sweep voltammetry and electrochemical impedance spectroscopic measurements. A maximum photocurrent density of 2.791 mA/cm2 was observed for the MoS2/CoTe (1:1) heterojunction which is about 11 times higher than the pristine MoS2. This current density was obtained at an applied bias of 0.62 V vs. Ag/AgCl (1.23 V vs. RHE) under the light intensity of 100 mW/cm2 of AM 1.5G illumination. The enhanced photocurrent density may be attributed to the efficient electron-hole pair separation. The solar to hydrogen conversion efficiency was found to be 0.84% for 1:1 MoS2/CoTe, signifying the efficient formation of the p-n junction. This study offers a novel heterojunction photocatalyst, for PEC water splitting.
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Affiliation(s)
| | - Habib Nasir
- School of Natural Sciences, National University of Sciences and Technology, H-12, Islamabad 44000, Pakistan; (E.S.); (A.M.); (M.F.E.); (M.S.); (S.I.); (S.A.B.B.)
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Manikandan M, Subramani K, Sathish M, Dhanuskodi S. Hydrothermal synthesis of cobalt telluride nanorods for a high performance hybrid asymmetric supercapacitor. RSC Adv 2020; 10:13632-13641. [PMID: 35493025 PMCID: PMC9051561 DOI: 10.1039/c9ra08692g] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2019] [Accepted: 03/14/2020] [Indexed: 01/08/2023] Open
Abstract
Cobalt telluride nanostructured materials have demonstrated various applications, particularly in energy generation and storage. A high temperature and reducing atmosphere are required for the preparation of cobalt telluride-based materials, which makes this a difficult and expensive process. The development of a facile route for producing the desirable nanostructure of cobalt telluride remains a great challenge. We demonstrated a simple hydrothermal method for preparing cobalt telluride nanorods (CoTe NRs) and telluride nanorods (Te NRs) for supercapacitor applications. The morphology of CoTe NRs and Te NRs was analyzed using scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The prepared CoTe NR electrode material exhibited a high specific capacity of 170 C g−1 at a current density of 0.5 A g−1 with an exceptional cyclic stability. The asymmetric supercapacitor was assembled using CoTe NRs and orange peel-derived activated carbon (OPAA-700) as a positive and negative electrode, respectively. The fabricated device delivered a high energy density of 40.7 W h kg−1 with a power density of 800 W kg−1 at 1 A g−1 current density. When the current density was increased to 30 A g−1, the fabricated device delivered a high power density of 22.5 kW kg−1 with an energy density of 16.3 W h kg−1. The fabricated asymmetric supercapacitor displayed a good cyclic stability performance for 10 000 cycles at a high current density of 30 A g−1 and retained 85% of its initial capacity for after 10 000 cycles. The prepared materials indicate their applicability for high performance energy storage devices. A one-step hydrothermal derived cobalt telluride nanorods and activated carbon-based hybrid asymmetric supercapacitor delivered a high energy (40.7 W h kg−1) and power density (22.5 kW kg−1) with an electrochemical stability of 85% for 10000 cycles.![]()
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Affiliation(s)
- M. Manikandan
- School of Physics
- Bharathidasan University
- Tiruchirappalli – 620 024
- India
| | - K. Subramani
- Electrochemical Power Sources Division
- CSIR-CECRI
- Karaikudi – 630 003
- India
- Academy of Scientific and Innovative Research (AcSIR)
| | - M. Sathish
- Electrochemical Power Sources Division
- CSIR-CECRI
- Karaikudi – 630 003
- India
- Academy of Scientific and Innovative Research (AcSIR)
| | - S. Dhanuskodi
- School of Physics
- Bharathidasan University
- Tiruchirappalli – 620 024
- India
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8
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Jamwal D, Mehta SK. Metal Telluride Nanomaterials: Facile Synthesis, Properties and Applications for Third Generation Devices. ChemistrySelect 2019. [DOI: 10.1002/slct.201803680] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Affiliation(s)
- Deepika Jamwal
- Department of Chemistry and Centre of Advanced Studies in Chemistry; Panjab University; Chandigarh 160014 India
- School of Chemistry, Faculty of Basic Sciences; Shoolini University, Solan, H.P.; 173212 India
| | - Surinder Kumar Mehta
- Department of Chemistry and Centre of Advanced Studies in Chemistry; Panjab University; Chandigarh 160014 India
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Metal Chalcogenides on Silicon Photocathodes for Efficient Water Splitting: A Mini Overview. Catalysts 2019. [DOI: 10.3390/catal9020149] [Citation(s) in RCA: 35] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
In the photoelectrochemical (PEC) water splitting (WS) reactions, a photon is absorbed by a semiconductor, generating electron-hole pairs which are transferred across the semiconductor/electrolyte interface to reduce or oxidize water into oxygen or hydrogen. Catalytic junctions are commonly combined with semiconductor absorbers, providing electrochemically active sites for charge transfer across the interface and increasing the surface band bending to improve the PEC performance. In this review, we focus on transition metal (di)chalcogenide [TM(D)C] catalysts in conjunction with silicon photoelectrode as Earth-abundant materials systems. Surprisingly, there is a limited number of reports in Si/TM(D)C for PEC WS in the literature. We provide almost a complete survey on both layered TMDC and non-layered transition metal dichalcogenides (TMC) co-catalysts on Si photoelectrodes, mainly photocathodes. The mechanisms of the photovoltaic power conversion of silicon devices are summarized with emphasis on the exact role of catalysts. Diverse approaches to the improved PEC performance and the proposed synergetic functions of catalysts on the underlying Si are reviewed. Atomic layer deposition of TM(D)C materials as a new methodology for directly growing them and its implication for low-temperature growth on defect chemistry are featured. The multi-phase TM(D)C overlayers on Si and the operation principles are highlighted. Finally, challenges and directions regarding future research for achieving the theoretical PEC performance of Si-based photoelectrodes are provided.
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Pi H, Zhang D, Zhang X, Jin Z, Zhang L, Cui X, Zheng W. Passivation of the surface imperfection of TiO2 by using ZIF-8 for efficient carrier separation/transfer. Dalton Trans 2018; 47:209-214. [DOI: 10.1039/c7dt03972g] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Photoelectrochemical (PEC) water splitting offers a promising chance for energy generation on a global scale.
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Affiliation(s)
- Haotian Pi
- Key Laboratory of Automobile Materials of MOE and Department of Materials Science
- Jilin University
- Changchun
- China
| | - Dantong Zhang
- Key Laboratory of Automobile Materials of MOE and Department of Materials Science
- Jilin University
- Changchun
- China
| | - Xinmeng Zhang
- Department of Food Quality and Safety
- Jilin University
- Changchun 130062
- China
| | - Zhao Jin
- Key Laboratory of Automobile Materials of MOE and Department of Materials Science
- Jilin University
- Changchun
- China
| | - Lei Zhang
- Key Laboratory of Automobile Materials of MOE and Department of Materials Science
- Jilin University
- Changchun
- China
| | - Xiaoqiang Cui
- Key Laboratory of Automobile Materials of MOE and Department of Materials Science
- Jilin University
- Changchun
- China
| | - Weitao Zheng
- Key Laboratory of Automobile Materials of MOE and Department of Materials Science
- Jilin University
- Changchun
- China
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Cai A, Guo A, Ma Z. Immobilization of TiO₂ Nanoparticles on Chlorella pyrenoidosa Cells for Enhanced Visible-Light-Driven Photocatalysis. MATERIALS 2017; 10:ma10050541. [PMID: 28772899 PMCID: PMC5459020 DOI: 10.3390/ma10050541] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/22/2017] [Revised: 05/04/2017] [Accepted: 05/09/2017] [Indexed: 11/24/2022]
Abstract
TiO2 nanoparticles are immobilized on chlorella cells using the hydrothermal method. The morphology, structure, and the visible-light-driven photocatalytic activity of the prepared chlorella/TiO2 composite are investigated by various methods. The chlorella/TiO2 composite is found to exhibit larger average sizes and higher visible-light intensities. The sensitization of the photosynthesis pigment originating from chlorella cells provides the anatase TiO2 with higher photocatalytic activities under the visible-light irradiation. The latter is linked to the highly efficient charge separation of the electron/hole pairs. The results also suggest that the photocatalytic activity of the composite remains substantial after four cycles, suggesting a good stability.
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Affiliation(s)
- Aijun Cai
- College of Life Science and Technology, Hebei Normal University of Science & Technology, Qinhuangdao 066600, China.
- College of Chemistry and Material Sciences, Hebei Normal University, Shijiazhuang 050016, China.
| | - Aiying Guo
- College of Life Science and Technology, Hebei Normal University of Science & Technology, Qinhuangdao 066600, China.
| | - Zichuan Ma
- College of Chemistry and Material Sciences, Hebei Normal University, Shijiazhuang 050016, China.
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