Free-standing 3D Co3O4@NF micro-flowers composed of porous ultra-long nanowires as an advanced cathode material for supercapacitor |
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| Institution: | 1. Metallurgy & Materials Engineering Department, Dawood University of Engineering and Technology, Karachi, 74800, Pakistan;2. School of Physical Science and Technology, Lanzhou University, Lanzhou, 730000, PR China;3. Department of Physics, COMSATS University Islamabad, Lahore Campus, Punjab, 54000, Pakistan;4. Departamento de Quimica Organica, Universidad de Cordoba, Edificio Marie Curie (C-3), Ctra Nnal IV-A, Km 396, E14014, Cordoba, Spain;5. Institute of Energy Storage Technologies, Yunnan University, Kunming, 650091, PR China;6. Institute for Advanced Study, Institute of Microscale Optoelectronics, Shenzhen University, Shenzhen, 518060, PR China;7. College of Chemical Engineering, Huanggang Normal University, Huanggang, 438000, PR China;8. College of Electrical Engineering, Sichuan University, Chengdu, 610065, PR China;9. Department of Chemistry, College of Science, King Saud University, Riyadh, 11451, Saudi Arabia;10. Institute for Advanced Study, Shenzhen University, Shenzhen, 518060, PR China;11. School of Chemical Sciences and Engineering, Yunnan University, Kunming, 650091, Yunnan Province, PR China |
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| Abstract: | The development of smart structured cathode materials for supercapacitors (SCs) has sparked tremendous interest. However, the appropriate design to achieve high capacitance and energy density-based cathode materials remains a major problem for energy storage systems. This article describes the effective synthesis of self-supported 3D micro-flowers composed of ultrathin nanowires array of Co3O4 on Ni foam (NF) using hydrothermal conditions (Co3O4@NF). The mesoporous Co3O4@NF with a high surface area, providing a rich active state for the Faraday redox reaction and increasing the diffusion rate of the electrolyte ions. The optimized Co3O4@NF-16h electrode exhibited supreme electrochemical performance by delivering a high specific capacitance of 1878, (1127) and 1200 (720 C g?1) F g?1 at 1.0 and 20 A g?1, respectively. The Co3O4@NF electrode retained good capacitance stability of 91% over 10000 cycles at 20 A g?1 with excellent rate-performance of 67% at 20 folded high current values. The obtained results for the Co3O4@NF electrode are presented the enhanced pseudocapacitive performance, indicating the substantial potential for high-performance supercapacitor applications. |
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| Keywords: | Cathode material Self-supported Nanowires Supercapacitors |
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