Mirghni A A, Madito M J, Oyedotun K O, Masikhwa T M, Ndiaye N M, Ray Sekhar J, Manyala N
Department of Physics, Institute of Applied Materials, SARCHI Chair in Carbon Technology and Materials, University of Pretoria Pretoria 0028 South Africa
Department of Physics, College of Science, Engineering and Technology, University of South Africa Private Bag X6, Florida, 1710, Science Campus, Christiaan de Wet and Pioneer Avenue, Florida Park Johannesburg 1710 South Africa.
RSC Adv. 2018 Mar 26;8(21):11608-11621. doi: 10.1039/c7ra12028a. eCollection 2018 Mar 21.
This work presents the effect of different contents of graphene foam (GF) on the electrochemical capacitance of nickel phosphate Ni(PO) nano-rods as an electrode material for hybrid electrochemical energy storage device applications. Pristine Ni(PO) nano-rods and Ni(PO)/GF composites with different GF mass loadings of 30, 60, 90 and 120 mg were synthesised a hydrothermal method. The electrochemical behavior of pristine Ni(PO) and Ni(PO)/GF composites were analysed in a three-electrode cell configuration using 6 M KOH electrolyte. The Ni(PO)/90 mg GF composite sample exhibited the highest specific capacity of 48 mA h g at a current density of 0.5 A g. The electrochemical behavior of the Ni(PO)/90 mg GF composite was further analysed in a two-electrode hybrid asymmetric device. A hybrid asymmetric device was fabricated with Ni(PO)/90 mg GF as the cathode and carbonized iron cations (Fe) adsorbed onto polyaniline (PANI) (C-FP) as the anode material (Ni(PO)/90 mg GF//C-FP) and tested in a wide potential window range of 0.0-1.6 V using 6 M KOH. This hybrid device achieved maximum energy and power densities of 49 W h kg and 499 W kg, respectively, at 0.5 A g and had long-term cycling stability.
本工作展示了不同含量的石墨烯泡沫（GF）对磷酸镍Ni(PO)纳米棒作为混合电化学储能装置应用电极材料的电化学电容的影响。采用水热法合成了原始的Ni(PO)纳米棒以及GF质量负载分别为30、60、90和120 mg的Ni(PO)/GF复合材料。在三电极电池配置中，使用6 M KOH电解质分析了原始Ni(PO)和Ni(PO)/GF复合材料的电化学行为。Ni(PO)/90 mg GF复合样品在电流密度为0.5 A g时表现出最高比容量48 mA h g。在两电极混合不对称装置中进一步分析了Ni(PO)/90 mg GF复合材料的电化学行为。以Ni(PO)/90 mg GF作为阴极，以吸附在聚苯胺（PANI）上的碳化铁阳离子（Fe）（C-FP）作为阳极材料（Ni(PO)/90 mg GF//C-FP）制备了混合不对称装置，并在0.0 - 1.6 V的宽电位窗口范围内使用6 M KOH进行测试。该混合装置在0.5 A g时分别实现了49 W h kg的最大能量密度和499 W kg的最大功率密度，并具有长期循环稳定性。
