Developing Free-Standing Flexible Electrode For Supercapacitor Applications

  • Ahmed Bin Ari

Student thesis: Master's Thesis

Abstract

Due to the recent advances in smart wearable and flexible electronics, designing a binder free, highly conductive free-standing electrode have greatly boosts the interest in the development of cost-effective flexible supercapacitors (SCs). In this paper, the free-standing electrode 3D architectures, based on Ni(OH)2 core-shell nanosheets (NSs) directly grown on joint-welded carbon nanotube foam (CNTF) network have been introduced via unique and facile chemical bath synthesis strategy. As a result of the unique CNTF 3D core configuration and the nano-structural shell design of Ni(OH)2 NSs, the as-prepared electrode displayed excellent electrochemical performances. When tested as a supercapacitor free-standing electrode, it showed outstanding specific capacitance of 1272 F g-1 at a scan rate of 2 A g-1, and even retained a value of 517 A g-1 at 20 A g-1 demonstrating excellent rate performance. The excellent electrochemical performance is due to the highly conductive nanotube network and the unique nanostructure of Ni(OH)2 nanosheets, which promote the ion transport in fast speed, whilst facilitating the charge storage via redox reactions in nanosheets. The exhibited impressive specific capacitance and the significant rate performance of the core-shell Ni(OH)2 NSs, combined with the flexibility of the welded-CNTF network, present the developed 3D architecture a promising candidate for the free-standing, binder and conductive agent free electrode for high-performance flexible supercapacitor applications.
Date of AwardJul 2019
Original languageAmerican English
SupervisorLianxi Zheng (Supervisor)

Keywords

  • Ni(OH)2 nanosheets; carbon nanotube foam; flexible electrode; supercapacitor; pseudocapacitor.

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