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Tahmasbi B, Nikoorazm M, Moradi P, Abbasi Tyula Y. A Schiff base complex of lanthanum on modified MCM-41 as a reusable nanocatalyst in the homoselective synthesis of 5-substituted 1 H-tetrazoles. RSC Adv 2022; 12:34303-34317. [PMID: 36545578 PMCID: PMC9707292 DOI: 10.1039/d2ra05413b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2022] [Accepted: 11/13/2022] [Indexed: 11/30/2022] Open
Abstract
In this work, mesoporous MCM-41 was modified by a new Schiff-base formed from the condensation of triethylenetatramine and 5-bromosalicylaldehyde. Then, it was used for the stabilization of lanthanum metal (La-Schiff base@MCM-41) as a homoselective, reusable, efficient and biocompatible catalyst in the synthesis of 5-substituted 1H-tetrazole derivatives. The synthesized tetrazoles were characterized using 1H NMR and FT-IR spectroscopy and methods to measure their physical properties. La-Schiff base@MCM-41 was characterized by using various techniques such as ICP, CHN, XRD, TGA, BET, FT-IR spectroscopy, SEM, EDS and WDX. This catalyst has good stability and a heterogeneous nature, enabling it to be easily recovered and reused several times without significant loss in catalytic activity. This present strategy has important advantages such as utilizing PEG as a green solvent, short reaction times, excellent yields, easy recycling of the catalyst and pure separation of the products. The recovered La-Schiff base@MCM-41 catalyst was characterized by using FT-IR spectroscopy, SEM and AAS.
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Affiliation(s)
- Bahman Tahmasbi
- Department of Chemistry, Faculty of Science, Ilam UniversityP. O. Box 69315516IlamIran
| | - Mohsen Nikoorazm
- Department of Chemistry, Faculty of Science, Ilam UniversityP. O. Box 69315516IlamIran
| | - Parisa Moradi
- Department of Chemistry, Faculty of Science, Ilam UniversityP. O. Box 69315516IlamIran
| | - Yunes Abbasi Tyula
- Department of Chemistry, Faculty of Science, Ilam UniversityP. O. Box 69315516IlamIran
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2
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Saji VS. Nanotubes-nanosheets (1D/2D) heterostructured bifunctional electrocatalysts for overall water splitting. Electrochim Acta 2022. [DOI: 10.1016/j.electacta.2022.141095] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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3
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Li W, Wang C, Lu X. Conducting polymers-derived fascinating electrocatalysts for advanced hydrogen and oxygen electrocatalysis. Coord Chem Rev 2022. [DOI: 10.1016/j.ccr.2022.214555] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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4
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Zhang X, Hua S, Lai L, Wang Z, Liao T, He L, Tang H, Wan X. Strategies to improve electrocatalytic performance of MoS 2-based catalysts for hydrogen evolution reactions. RSC Adv 2022; 12:17959-17983. [PMID: 35765324 PMCID: PMC9204562 DOI: 10.1039/d2ra03066g] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2022] [Accepted: 06/13/2022] [Indexed: 02/01/2023] Open
Abstract
Electrocatalytic hydrogen evolution reactions (HERs) are a key process for hydrogen production for clean energy applications. HERs have unique advantages in terms of energy efficiency and product separation compared to other methods. Molybdenum disulfide (MoS2) has attracted extensive attention as a potential HER catalyst because of its high electrocatalytic activity. However, the HER performance of MoS2 needs to be improved to make it competitive with conventional Pt-based catalysts. Herein, we summarize three typical strategies for promoting the HER performance, i.e., defect engineering, heterostructure formation, and heteroatom doping. We also summarize the computational density functional theory (DFT) methods used to obtain insight that can guide the construction of MoS2-based materials. Additionally, the challenges and prospects of MoS2-based catalysts for the HER have also been discussed. In this review, we summarize three general classes of effective strategies to enhance the HER activity of MoS2 and DFT calculation methods, i.e. defect engineering, heterostructure formation, and heteroatom doping.![]()
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Affiliation(s)
- Xinglong Zhang
- School of Materials and Energy, University of Electronic Science and Technology of China Chengdu 611731 P. R. China
| | - Shiying Hua
- Wuhan Institute of Marine Electric Propulsion Wuhan 430064 P. R. China
| | - Long Lai
- School of Materials and Energy, University of Electronic Science and Technology of China Chengdu 611731 P. R. China
| | - Zihao Wang
- School of Materials and Energy, University of Electronic Science and Technology of China Chengdu 611731 P. R. China
| | - Tiaohao Liao
- School of Materials and Energy, University of Electronic Science and Technology of China Chengdu 611731 P. R. China
| | - Liang He
- School of Mechanical Engineering, Sichuan University Chengdu 610065 P. R. China
| | - Hui Tang
- School of Materials and Energy, University of Electronic Science and Technology of China Chengdu 611731 P. R. China
| | - Xinming Wan
- China Automotive Engineering Research Institute Co., Ltd. Chongqing 401122 P. R. China
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5
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Sun R, Zhao Z, Su Z, Li T, Zhao J, Shang Y. Multi-interface MoS 2/Ni 3S 4/Mo 2S 3 composite as an efficient electrocatalyst for hydrogen evolution reaction over a wide pH range. Dalton Trans 2022; 51:6825-6831. [PMID: 35438099 DOI: 10.1039/d2dt00231k] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
The exploitation of cost-efficiently electrocatalysts for hydrogen evolution reaction (HER) over a wide pH range remains a challenge. Herein, we prepared a novel multi-interface MoS2/Ni3S4/Mo2S3 composite on carbon cloth (CC) that acts as an efficient electrocatalyst over a wide pH range through a facile one-pot strategy, where (NH4)4[NiH6Mo6O24]·5H2O (abbreviated to NiMo6) as a bimetallic precursor and Ni(NO3)2·6H2O as one of the raw materials and salt are used together with thiourea (TU) for converting them into the MoS2/Ni3S4/Mo2S3 load on CC (abbreviated as MoS2/Ni3S4/Mo2S3/CC). MoS2/Ni3S4/Mo2S3/CC-24 h shows a distinguished electrocatalytic performance towards HER with long-term stability in acid and alkaline media. It presents low overpotentials of 38 mV and 51 mV in 0.5 M H2SO4 and 1.0 M KOH at 10 mA cm-2, respectively. This work can deliver a new idea to fabricate cost-efficient and long-term durability HER electrocatalysts over a broad pH range.
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Affiliation(s)
- Rui Sun
- College of Chemistry and Chemical Engineering, Harbin Normal University, Harbin, 150025, China.
| | - Zhifeng Zhao
- College of Chemistry, Guangdong University of Petrochemical Technology, Maoming, 525000, China.
| | - Zhanhua Su
- College of Chemistry, Guangdong University of Petrochemical Technology, Maoming, 525000, China.
| | - Tiansheng Li
- College of Chemistry and Chemical Engineering, Harbin Normal University, Harbin, 150025, China.
| | - Jingxiang Zhao
- College of Chemistry and Chemical Engineering, Harbin Normal University, Harbin, 150025, China.
| | - Yongchen Shang
- College of Chemistry and Chemical Engineering, Harbin Normal University, Harbin, 150025, China.
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6
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Shao M, Chen H, Cao Y, Fu S, Hao S, Chen M, Jin J, Wang W, Wu Y, Cui L. Phase transition in V-doped cobalt hydroxide for a superior alkaline hydrogen evolution reaction. Chem Commun (Camb) 2022; 58:12859-12862. [DOI: 10.1039/d2cc03371b] [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
The superior HER activity of V-Co(OH)2/CC is mainly attributed to the accelerated HER kinetics by V-doping.
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Affiliation(s)
- Mengmeng Shao
- School of Materials Science and Engineering, Dongguan University of Technology, Dongguan 523808, China
| | - Haodeng Chen
- School of Materials Science and Engineering, Dongguan University of Technology, Dongguan 523808, China
| | - Yongyong Cao
- College of Biological, Chemical Science and Engineering, Jiaxing University, Jiaxing 314001, China
| | - Shushu Fu
- School of Environment and Civil Engineering, Dongguan University of Technology, Dongguan 523808, China
| | - Shiji Hao
- School of Materials Science and Engineering, Dongguan University of Technology, Dongguan 523808, China
| | - Min Chen
- School of Materials Science and Engineering, Dongguan University of Technology, Dongguan 523808, China
| | - Jutao Jin
- School of Materials Science and Engineering, Dongguan University of Technology, Dongguan 523808, China
| | - Wenlong Wang
- School of Materials Science and Engineering, Dongguan University of Technology, Dongguan 523808, China
| | - Yunhui Wu
- School of Materials Science and Engineering, Dongguan University of Technology, Dongguan 523808, China
| | - Lifeng Cui
- College of Smart Energy, Shanghai Jiao Tong University, Shanghai 200240, China
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7
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Kiw YM, Adam P, Schaeffer P, Thiébaut B, Boyer C. Molecular evidence for sulfurization of molybdenum dithiocarbamates (MoDTC) by zinc dithiophosphates: a key process in their synergetic interactions and the enhanced preservation of MoDTC in formulated lubricants? RSC Adv 2022; 12:3542-3553. [PMID: 35425382 PMCID: PMC8979245 DOI: 10.1039/d1ra08657j] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2021] [Accepted: 01/13/2022] [Indexed: 01/12/2023] Open
Abstract
Molybdenum dithiocarbamates (MoDTC) are widely used in automotive industries as lubricant additives to reduce friction and to enhance fuel economy. Sulfur-containing additives such as zinc dithiophosphates (ZnDTP) are proposed to play a key role in the improvement of friction reducing properties of MoDTC in formulated lubricants by facilitating the formation of MoS2 tribofilm at the rubbing contacts. This study focuses on the interactions between MoDTC and ZnDTP under conditions comparable with those prevailing in operating engines. The capacity of ZnDTP to sulfurize MoDTC in solution in a hydrocarbon base oil could be demonstrated. Sulfurized Mo complexes bearing one or two additional sulfur atoms (1S-MoDTC and 2S-MoDTC, respectively) which have replaced the genuine oxygen atom(s) from the MoDTC core were detected and quantified using a specifically developed HPLC-MS analytical method. A possible sulfurization mechanism relying on the higher affinity of phosphorus from ZnDTP for oxygen could be proposed. In parallel, the evolution and molecular transformation of the prepared 2S-MoDTC in hydrocarbon base oil under thermal and thermo-oxidative conditions were followed using HPLC-MS and compared with the evolution of their friction coefficients. 2S-MoDTC complexes were shown to exhibit a better retention of friction reducing capability under oxidative conditions than the “classical” MoDTC, although they did not seem to significantly reduce the friction coefficients of lubricants as compared to the “classical” MoDTC. Therefore, sulfurization of MoDTC by ZnDTP might contribute to delaying the progressive consumption of MoDTC and the loss of their friction-reducing efficiency in lubricants under thermo-oxidative conditions. Sulfurization of MoDTC by ZnDTP: a key process in their synergetic interactions in engine lubricants?![]()
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Affiliation(s)
- Yu Min Kiw
- University of Strasbourg, CNRS, Institut de Chimie de Strasbourg UMR 7177, F-67000 Strasbourg, France
- TotalEnergies Solaize Research Center, BP22-69360 Cedex, France
| | - Pierre Adam
- University of Strasbourg, CNRS, Institut de Chimie de Strasbourg UMR 7177, F-67000 Strasbourg, France
| | - Philippe Schaeffer
- University of Strasbourg, CNRS, Institut de Chimie de Strasbourg UMR 7177, F-67000 Strasbourg, France
| | - Benoît Thiébaut
- TotalEnergies Solaize Research Center, BP22-69360 Cedex, France
| | - Chantal Boyer
- TotalEnergies Solaize Research Center, BP22-69360 Cedex, France
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8
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Mei Y, Cong Y, Huang S, Qian J, Ye J, Li TT. MOF-on-MOF Strategy to Construct a Nitrogen-Doped Carbon-Incorporated CoP@Fe-CoP Core-Shelled Heterostructure for High-Performance Overall Water Splitting. Inorg Chem 2021; 61:1159-1168. [PMID: 34962378 DOI: 10.1021/acs.inorgchem.1c03498] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
The design and preparation of efficient and low-cost catalysts for water electrolysis are crucial and highly desirable to produce eco-friendly and sustainable hydrogen fuel. Herein, we prepared nitrogen-doped carbon-incorporated CoP@Fe-CoP core-shelled nanorod arrays grown on Ni foam (CoP@Fe-CoP/NC/NF) through phosphorization of ZIF-67@Co-Fe Prussian blue analogue (ZIF-67@CoFe-PBA). The hierarchical nanorod arrays combined with the core-shelled structure offer favorable mass/electron transport capacity and maximize the active sites, thus enhancing the electrochemically active surface area. The synergistic effect of the bimetallic components and the nitrogen-doped carbon matrix endow the composite with an optimized electronic structure. Benefiting from the above superiorities of morphological and chemical compositions, this self-supported CoP@Fe-CoP/NC/NF heterostructure can drive alkaline hydrogen evolution reaction and oxygen evolution reaction with overpotentials of 97 and 270 mV to yield 100 mA cm-2, respectively. The two-electrode alkaline electrolyzer constructed by this heterostructure shows a low cell voltage of 1.58 V to yield 10 mA cm-2, superior to the precious-metal-based electrocatalyst apparatus (IrO2∥Pt/C). This study offers a feasible and facile approach to develop efficient electrocatalysts for water electrolysis, which applies to other electrochemical energy conversion and storage applications.
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Affiliation(s)
- Yan Mei
- School of Materials Science and Chemical Engineering, Ningbo University, Ningbo 315211, China
| | - Yikang Cong
- School of Materials Science and Chemical Engineering, Ningbo University, Ningbo 315211, China
| | - Shengsheng Huang
- School of Materials Science and Chemical Engineering, Ningbo University, Ningbo 315211, China
| | - Jinjie Qian
- College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou 325000, China
| | - Jun Ye
- School of Materials Science and Chemical Engineering, Ningbo University, Ningbo 315211, China
| | - Ting-Ting Li
- School of Materials Science and Chemical Engineering, Ningbo University, Ningbo 315211, China.,Key Laboratory of Advanced Mass Spectrometry and Molecular Analysis of Zhejiang Province, Ningbo University, Ningbo 315211, China
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9
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Chen P, Tai Y, Fang Q, Xu D, Gao Y, Cheng J. Solution combustion synthesis of ternary Ni/WC/C composites with efficient electrocatalytic oxygen reduction performance. RSC Adv 2021; 11:38718-38726. [PMID: 35493248 PMCID: PMC9044179 DOI: 10.1039/d1ra06884a] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2021] [Accepted: 11/18/2021] [Indexed: 11/21/2022] Open
Abstract
In this paper, a fast processing route involving a wet-chemical method (solution combustion synthesis, SCS) and carbonization in a CH4 environment was demonstrated, through which nanosized Ni/WC/C powder with an average size of 80 nm was obtained. In the catalyst powder, Ni was evenly distributed and it could form NiOOH to promote catalysis, and an amorphous carbon (C) layer with a thickness of <10 nm was formed on the surface of the composite particles, improving the stability of the Ni/WC powder and promoting electron transport. Due to the characteristics of uniformity and a large specific surface area and the synergistic effect of Ni, WC, and C, this powder showed significantly improved ORR catalytic activity in alkaline solution. When the amount of Ni doping was 15 wt%, the composite powder showed the smallest particle size and the best ORR catalytic performance. Its cathode peak potential was -0.31 V and the half wave potential was -0.34 V. The number of electrons transferred in the ORR reaction was 3.6. This work provided a fast and cheap method for the preparation of multicomponent composite catalyst materials.
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Affiliation(s)
- Pengqi Chen
- School of Materials Science and Engineering, Hefei University of Technology Hefei 230009 China .,National-Local Joint Engineering Research Centre of Nonferrous Metals and Processing Technology Hefei 230009 China
| | - Yunxiao Tai
- School of Materials Science and Engineering, Hefei University of Technology Hefei 230009 China
| | - Qingqing Fang
- School of Materials Science and Engineering, Hefei University of Technology Hefei 230009 China
| | - Dang Xu
- School of Materials Science and Engineering, Hefei University of Technology Hefei 230009 China
| | - Yufei Gao
- School of Materials Science and Engineering, Hefei University of Technology Hefei 230009 China
| | - Jigui Cheng
- School of Materials Science and Engineering, Hefei University of Technology Hefei 230009 China .,Research Centre for Powder Metallurgy Engineering and Technology of Anhui Province Hefei 230009 China
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10
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Cong Y, Huang S, Mei Y, Li TT. Metal-Organic Frameworks-Derived Self-Supported Carbon-Based Composites for Electrocatalytic Water Splitting. Chemistry 2021; 27:15866-15888. [PMID: 34472663 DOI: 10.1002/chem.202102209] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2021] [Indexed: 12/31/2022]
Abstract
Electrocatalytic water splitting has been considered as a promising strategy for the sustainable evolution of hydrogen energy and storage of intermittent electric energy. Efficient catalysts for electrocatalytic water splitting are urgently demanded to decrease the overpotentials and promote the sluggish reaction kinetics. Carbon-based composites, including heteroatom-doped carbon materials, metals/alloys@carbon composites, metal compounds@carbon composites, and atomically dispersed metal sites@carbon composites have been widely used as the catalysts due to their fascinating properties. However, these electrocatalysts are almost powdery form, and should be cast on the current collector by using the polymeric binder, which would result in the unsatisfied electrocatalytic performance. In comparison, a self-supported electrode architecture is highly attractive. Recently, self-supported metal-organic frameworks (MOFs) constructed by coordination of metal centers and organic ligands have been considered as suitable templates/precursors to construct free-standing carbon-based composites grown on conductive substrate. MOFs-derived carbon-based composites have various merits, such as the well-aligned array architecture and evenly distributed active sites, and easy functionalization with other species, which make them suitable alternatives to non-noble metal-included electrocatalysts. In this review, we intend to show the research progresses by employment of MOFs as precursors to prepare self-supported carbon-based composites. Focusing on these MOFs-derived carbon-based nanomaterials, the latest advances in their controllable synthesis, composition regulation, electrocatalytic performances in hydrogen evolution reaction (HER), oxygen evolution reaction (OER), and overall water splitting (OWS) are presented. Finally, the challenges and perspectives are showed for the further developments of MOFs-derived self-supported carbon-based nanomaterials in electrocatalytic reactions.
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Affiliation(s)
- Yikang Cong
- School of Materials Science and Chemical Engineering, Ningbo University, Ningbo, 315211, P. R. China
| | - Shengsheng Huang
- School of Materials Science and Chemical Engineering, Ningbo University, Ningbo, 315211, P. R. China
| | - Yan Mei
- School of Materials Science and Chemical Engineering, Ningbo University, Ningbo, 315211, P. R. China
| | - Ting-Ting Li
- School of Materials Science and Chemical Engineering, Ningbo University, Ningbo, 315211, P. R. China.,Key Laboratory of Advanced Mass Spectrometry and, Molecular Analysis of Zhejiang Province, Ningbo University, Ningbo, 315211, P. R. China
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11
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Sha Q, Huai J, Zhang F, Ma K, Zhao Z. MOF-derived CoP3/FeP on nitrogen-doped carbon nanoarray boosted high-performance hydrogen evolution. J Electroanal Chem (Lausanne) 2021. [DOI: 10.1016/j.jelechem.2021.115521] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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12
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Wang Y, Lv X, Zou S, Lin X, Ni Y. MoS 2/polyaniline/functionalized carbon cloth electrode materials for excellent supercapacitor performance. RSC Adv 2021; 11:10941-10950. [PMID: 35423601 PMCID: PMC8695988 DOI: 10.1039/d0ra09126j] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2020] [Accepted: 02/18/2021] [Indexed: 11/25/2022] Open
Abstract
In this study, molybdenum disulfide (MoS2), polyaniline (PANI) and their composite (MoS2/PANI) were facilely prepared via a liquid-phase method and in situ polymerization. An MoS2/PANI/functionalized carbon cloth (MoS2/PANI/FCC) was facilely constructed by a drop-casting method. MoS2/PANI-10/FCC displays remarkable electrochemical performances, and its specific capacitances varied from 452.25 to 355.5 F g−1 at current densities ranging from 0.2 to 4 A g−1, which were higher than those of MoS2/CC (from 56.525 to 7.5 F g−1) and pure PANI/CC (319.5 to 248.5 F g−1), respectively. More importantly, the MoS2-10/PANI/FCC electrode has a long cycling life, and a capacity retention of 87% was obtained after 1000 cycles at a large current density of 10 A g−1. Moreover, the MoS2/PANI-10/FCC-based symmetric supercapacitor also exhibits excellent rate performance and good cycling stability. The specific capacitance based on the total mass of the two electrodes is 72.8 F g−1 at a current density of 0.2 A g−1 and the capacitance retention of 85% is obtained after 1000 cycles. A MoS2/PANI/functionalized carbon cloth (MoS2/PANI/FCC) was constructed by a drop-casting method. Its specific capacitances were higher than those of MoS2/CC and pure PANI/CC.![]()
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Affiliation(s)
- Yanfang Wang
- College of Chemistry, Nanchang University Nanchang 330031 China +86 791 83969500 +86 791 83969500
| | - Xinrong Lv
- College of Chemistry, Nanchang University Nanchang 330031 China +86 791 83969500 +86 791 83969500
| | - Suyan Zou
- College of Chemistry, Nanchang University Nanchang 330031 China +86 791 83969500 +86 791 83969500
| | - Xiaoyun Lin
- College of Chemistry, Nanchang University Nanchang 330031 China +86 791 83969500 +86 791 83969500.,Jiangxi Province Key Laboratory of Modern Analytical Science, Nanchang University Nanchang 330031 China
| | - Yongnian Ni
- College of Chemistry, Nanchang University Nanchang 330031 China +86 791 83969500 +86 791 83969500
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13
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Parreño RP, Liu YL, Beltran AB. Effect on thermal stability of microstructure and morphology of thermally-modified electrospun fibers of polybenzoxazines (PBz) blended with sulfur copolymers (SDIB). RSC Adv 2021; 11:10002-10009. [PMID: 35423484 PMCID: PMC8695406 DOI: 10.1039/d1ra00705j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2021] [Accepted: 03/02/2021] [Indexed: 11/21/2022] Open
Abstract
Simple modification by thermal treatment is the commonly used approach to enhance the performance of electrospun fibers. This was investigated in the thermal treatment of polybenzoxazine (PBz) fibers blended with sulfur copolymers (SDIB) to determine the effect of varying treatment conditions on the microstructure and morphology of PBz fibers with the effect of incorporating sulfur functional groups on resulting properties. Mechanical properties of PBz are greatly improved by thermally-induced ring-opening polymerization (ROP) of the oxazine ring. Blending with sulfur copolymers (SDIB) could have beneficial effects on endowed features on fibers but could also affect the resulting properties of SDIB-blended PBz fibers during crosslinking reactions. Fiber mats were fabricated by electrospinning of PBz (10 wt%) blended with SDIB (10 wt%). Physical modification with varying conditions of sequential thermal treatment were evaluated and compared to the conditions applied on pristine PBz fibers. Changes in morphology and microstructure of fibers after modification were analyzed through scanning electron microscopy (SEM) while elemental compositions were identified after varying the conditions of thermal treatment. Adjustment of treatment conditions using two-step temperature sequential thermal treatment with higher temperatures of 160 °C and 240 °C showed significant changes in microstructure and morphology of fibers. Lower temperatures of 120 °C and 160 °C exhibited microstructure and morphology of fibers which affected the fiber diameter and fiber networks. Cross-sectional SEM images also confirmed the adversed effect of high-temperature treatment conditions on fibrous structures while low-temperature treatment retained the fibrous structures with more compact and stiff fiber networks. SDIB-blended PBz fibers were also evaluated by TGA and DSC to correlate the changes in structure and morphology with the thermal stability and integrity of blended SDIB/PBz fibers as compared to pristine PBz with the effect of change in treatment conditions. Fiber strength indicated slower weight loss for blended fibers and higher onset temperature of degradation which resulted in more thermally stable fibers.
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Affiliation(s)
- Ronaldo P Parreño
- Department of Chemical Engineering, De La Salle University 2401 Taft Avenue Manila 1004 Philippines
- Chemicals and Energy Division, Industrial Technology Development Institute (ITDI), Department of Science and Technology (DOST) Taguig 1631 Philippines
| | - Ying-Ling Liu
- Department of Chemical Engineering, National Tsing Hua University Hsinchu 30013 Taiwan
| | - Arnel B Beltran
- Department of Chemical Engineering, De La Salle University 2401 Taft Avenue Manila 1004 Philippines
- Center for Engineering and Sustainable Development Research, De La Salle University 2401 Taft Avenue Manila 1004 Philippines
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14
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Cao FJ, Wang L, Feng CL, Lin X, Feng H. Synthesis of polyurethane-derived nitrogen-doped carbon dots for a high-performance fluorescence bioimaging probe. RSC Adv 2021. [DOI: 10.1039/d1ra06334k] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A universal and robust strategy using polyurethane sponge as a precursor was developed to synthesize highly-soluble nitrogen-doped carbon quantum dots via a solvothermal method.
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Affiliation(s)
- Fang-Jun Cao
- Shaanxi Institute of Zoology, Xi'an, Shaanxi 710072, P. R. China
| | - Lu Wang
- Shaanxi Institute of Zoology, Xi'an, Shaanxi 710072, P. R. China
| | - Cheng-Li Feng
- Shaanxi Institute of Zoology, Xi'an, Shaanxi 710072, P. R. China
| | - Xiao Lin
- School of Life Science, Northwestern Polytechnical University, Xi'an, Shaanxi 710072, P. R. China
| | - Hui Feng
- Shaanxi Institute of Zoology, Xi'an, Shaanxi 710072, P. R. China
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