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A Ni₁₋ₓZnₓS/Ni foam composite electrode with multi-layers: one-step synthesis and high supercapacitor performance

Wang, Xiaobing, Hao, Jin, Su, Yichang, Liu, Fanggang, An, Jian, Lian, Jianshe
Journal of materials chemistry A 2016 v.4 no.33 pp. 12929-12939
capacitance, electrochemistry, electrodes, foams, nanomaterials, nickel, specific energy, synergism, zinc
Multi-layer NiₓZn₁₋ₓS/Ni foam composites were synthesized by the facile method of a one-step hydrothermal reaction on a frame of Ni foam. The Zn element plays a critical role in constructing the multi-layer nanostructure. In particular, various layers with different morphologies work with good synergistic effect to provide an excellent electrochemical performance. The as-synthesized Ni₁₋ₓZnₓS/Ni foam-2 h electrode shows a high specific capacitance (1815 F g⁻¹ at 1 A g⁻¹) and outstanding rate properties (1050 F g⁻¹ at 100 A g⁻¹ and 50.1% rate retention over 200 A g⁻¹). Moreover, a two-electrode Ni₁₋ₓZnₓS/Ni foam-2 h//active carbon–graphene (AC–G) asymmetric supercapacitor device was fabricated and it delivers both a high specific energy density and an excellent cycling stability. The strategy presented here for constructing multi-layer structures is facile and effective, and could be expanded as a general method.