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Silver particle-loaded nickel oxide nanosheet arrays on nickel foam as advanced binder-free electrodes for aqueous asymmetric supercapacitors

机译:泡沫镍上负载银颗粒的氧化镍纳米片阵列,作为用于水性不对称超级电容器的高级无粘合剂电极

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Conductive metal loading is an efficient approach for enhancing the electric conductivity of redox-active transition-metal oxide electrodes. In this study, Ag particle-loaded NiOickel foam (Ag-NiO/NF) composites were fabricated using a green chemistry method. The anchored Ag particles standing on the surface of NiO nanosheet arrays helped improve the electrical conductivity and were thus beneficial for supercapacitors (SCs). The as-developed Ag-NiO/NF electrode delivered a specific capacitance of 1254.9 F g?1 at the current density of 1 A g?1, which is higher than that of NiO/NF electrode (946.3 F g?1). Using such Ag-NiO/NF as a positive electrode, we further fabricated aqueous asymmetric SC devices with reduced graphene oxide as a negative electrode. Owing to the efficient electron transport and short ion diffusion paths in the designed electrode, the devices exhibited a high specific capacitance of 97.9 F g at 1 A g?1 with a high energy density of 26.7 W h kg?1 at a power density of 1017.1 W kg?1 and great cyclic stability.
机译:导电金属负载是用于增强氧化还原活性过渡金属氧化物电极的电导率的有效方法。在这项研究中,使用绿色化学方法制备了负载有Ag颗粒的NiO /镍泡沫(Ag-NiO / NF)复合材料。站在NiO纳米片阵列表面上的锚定Ag颗粒有助于改善电导率,因此对超级电容器(SC)有益。已开发的Ag-NiO / NF电极在1 A g ?1的电流密度下可提供1254.9 F g ?1 的比电容 ,它比NiO / NF电极的高(946.3 F g ?1 )。使用这种Ag-NiO / NF作为正极,我们进一步制造了以氧化石墨烯还原为负极的水性不对称SC器件。由于设计的电极中有效的电子传输和短的离子扩散路径,这些器件在1 A g ?1 处显示出97.9 F g的高比电容,具有较高的比电容。功率密度为1017.1 W kg ?1 且大循环时,能量密度为26.7 W h kg ?1 稳定性。

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