A conductive anionic Co-MOF cage with zeolite framework for supercapacitors |
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| Institution: | 1. Key Laboratory of Materials for New Energy Conversion and Storage, Ministry of Industry and Information Technology, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, 150001, China;2. East University of Heilongjiang, Harbin, 150066, China;1. Energy & Materials Engineering Centre, College of Physics and Materials Science, Tianjin Normal University, Tianjin 300387, China;2. Tianjin International Joint Research Centre of Surface Technology for Energy Storage Materials, Tianjin Normal University, Tianjin 300387, China;3. Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Nankai University, Tianjin 300071, China;1. Research School of Polymeric Materials, School of Materials Science & Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China;2. Research Institute of Chemical Defense, Beijing 100191, China;1. Department of Electronic and Computer Engineering, Sungkyunkwan University, Jangan-Gu, Suwon, Gyeonggi-do 16419, South Korea;2. Department of Chemistry, Washington State University, Pullman, WA 99164-4630, United States;1. School of Chemistry and Chemical Engineering, Southeast University, Nanjing, 211189, China;2. School of Pharmaceutical and Chemical Engineering, Chengxian College, Southeast University, Nanjing, 210088, China;1. Nanotechnology Research Laboratory, Faculty of Engineering Sciences, GIK Institute of Engineering Sciences and Technology, Topi, 23640, Khyber Pakhtunkhwa, Pakistan;2. Material Chemistry Laboratory, Department of Chemistry GC University Lahore, 54000, Pakistan;3. Department of Electrical and Biological Physics, Kwangwoon University, Seoul, 01897, Republic of Korea |
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| Abstract: | Conductive MOFs could exhibit full potential as integrated electrode materials for supercapacitors without interference from additional conductive additives. Here we report an anionic Co-MOF cage with zeolite framework, which was balanced by the redox-active guest Co(H2O)6]2+ and protonated (CH3)2NH2]2+ ions. Benefit from the unique ion skeleton structure, Co-MOF exhibits a conductivity higher than most of reported MOFs with the value of 1.42 × 10-3 S/cm, which can be directly fabricated as electrode for supercapacitors. A maximum specific capacitance of 236.2 F/g can be achieved at a current density of 1 A/g of Co-MOF. Additionally, the electric performance and morphology of this Co-MOF can be modified by cetyltrimethylammonium bromide (CTAB) and the maximum specific capacitance could increase up to 334 F/g at 1 A/g when the ratio of ligand and CTAB is 1:6 (Co-MOF-6). Furthermore, the specific capacitance can retain at 64.04% and 77.92% of the initial value after 3000 cycles of Co-MOF and Co-CTAB-6, respectively. Obviously, the addition of CTAB further improves both capacitance and cycle stability. |
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| Keywords: | Metal organic frameworks Supercapacitors Cetyltrimethylammonium bromide Redox-active guest |
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