(General Student Poster Session Winner - 2nd Place Solid-State) Solvothermal Preparation of Microspherical Flowerlike Ni(OH)2/Graphene Oxide Electrode for Electrochemical Capacitor Application

Tuesday, 3 October 2017
Prince George's Exhibit Hall D/E (Gaylord National Resort and Convention Center)
A. A. Khaleed (Ahmadu Bello University, Zaria, Nigeria), A. Bello, J. K. Dangbegnon, O. Olaniyan (University of Pretoria), B. W. Mwakikunga (CSIR- National Centre for Nano-Structured Materials), and N. Manyala (University of Pretoria)
The growing need for energy coupled with the rise in global warming and air pollution due to the burning and consumption of fossil fuels has led to an increase in alternative energy sources to meet the exponential rise in energy. Electrochemical capacitors also known as supercapacitors have attracted great attention in electrochemical energy storage application resulting from their outstanding work rate, excellent cycle life and moderate energy density. In general, they are classified into two based on the mechanism in which the store charges. Electrochemical double-layer capacitors (EDLCs) that store energy based on ion adsorption, and pseudocapacitors which store energy by the fast surface redox process. Composite of spherical Ni(OH)2/GO was synthesized via a surfactant free solvothermal technique and tested as electrodes for electrochemical capacitors. Structural and morphological analysis confirmed that incorporation of GO into Ni(OH)2 does not change the crystal structure of the pure hexagonal α-Ni(OH)2. Electrodes fabricated from the composite demonstrates a superior electrochemical performance by exhibiting a specific capacity of ∼ 420 mA h g-1 at 10 A g-1, with a corresponding rate capability of 78% when compared to that of pure Ni(OH)2, GO, and Mix-Ni(OH)2/GO. The stability study of the Ni(OH)2/GO composite exhibits a good capacity retention of ∼ 96% at a current density of 10 A g-1 after 3000 charge-discharge cycles.