Dispersing WO3 in carbon aerogel makes an outstanding supercapacitor electrode material |
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| Affiliation: | 1. National Centre for Nanosciences and Nanotechnology, University of Mumbai, Mumbai, 400098, Maharashtra, India;2. School of Physical Sciences, Solapur University, Solapur, 413255, Maharashtra, India;3. Lal Bahadur Shastri Mahavidyalaya, Satara, 415002, Maharashtra, India;4. Symbiosis Institute of Technology, Symbiosis International University, Lavale, Pune, 412115, Maharashtra, India;5. Department of Physics, Savitribai Phule Pune University, Pune, India;6. Emeritus Scientist (CSIR), Centre for Materials for Electronic Technology (C-MET), Pune, 411008, Maharashtra, India;7. Physical and Materials Chemistry Division, CSIR-National Chemical Laboratory, Dr. Homi Bhabha Road, Pashan, Pune, 411008, Maharashtra, India;1. Research Center of Nano Science and Technology, School of Materials Science and Engineering, Shanghai University, Shanghai 200444, PR China;2. Laboratory for Microstructures, Shanghai University, Shanghai 200444, PR China;3. The State Key Laboratory for Refractories and Metallurgy, School of Materials and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, PR China;4. Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, PR China;1. CQE, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal;2. Department of Materials Science, Institute for Surface Science and Corrosion WW4-LKO, University of Erlangen-Nuremberg, Martensstraße 7, D-91058 Erlangen, Germany;3. Chemistry Department, Faculty of Sciences, King Abdulaziz University, 80203 Jeddah, Saudi Arabia;4. Department of Mechanical Engineering, GI-MOSM, Instituto Superior de Engenharia de Lisboa-ISEL, 1950-062 Lisboa, Portugal;1. Department of Energy Science, Alagappa University, Karaikudi, 630 003, Tamil Nadu, India;2. Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, 2-4 Hibikino, Kitakyushu, Fukuoka, 808-0196, Japan |
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| Abstract: | Tungsten oxide, originally poor in capacitive performance, was made an excellent electrode material for supercapacitors, by dispersing it to carbon aerogels (CA), a conductive and mesoporous hosting template, that drastically improved the utilization of WO3 for capacitance generation. The WO3 was introduced to the CA, in a form of well-dispersed single crystalline nanoparticles of 15–40 nm in size, with a simple immersion-calcination process. A one order of magnitude improvement in specific capacitance was achieved with the present composition, from 54 F/g for WO3 nanoparticles to 700 F/g for WO3/CA composites (scaned at 25 mV/s in 0.5 M H2SO4 over a potential window of ?0.3 to 0.5 V). The WO3/CA composites exhibited an excellent high rate capability with a 60% retention in specific capacitance at 500 mV/s, almost perfect cycle efficiency of 99%, and outstanding cycling stability of only 5% decay in specific capacitance after 4000 cycles. |
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