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Highly conductive NiSe2 nanostructures for all-solid-state battery–supercapacitor hybrid devices

Meng, Lu, Wu, Yuhao, Zhang, Tian, Tang, Haichao, Tian, Yang, Yuan, Yuliang, Zhang, Qinghua, Zeng, Yujia, Lu, Jianguo
Journal of materials science 2019 v.54 no.1 pp. 571-581
activated carbon, electrochemistry, electrodes, electronic equipment, energy, energy density, nanomaterials
We have developed a facile one-step hydrothermal strategy to synthesize pyramid-like NiSe₂ nanostructures, serving as electrode materials for battery–supercapacitor hybrid (BSH) devices. The NiSe₂ nanopyramid electrode exhibits superior electrochemical performances, including a high specific capacity of 240.83 mAh g⁻¹ at current density of 1 A g⁻¹ and a low internal resistance of 0.85 Ω. The all-solid-state hybrid devices have been assembled with NiSe₂ as the battery-type electrode and activated carbon as the capacitor-type electrode. The hybrid device exhibits a high energy density of 0.196 mWh cm⁻² at power density of 1.60 mW cm⁻². The internal resistance of 1.52 Ω further reveals the nature of low resistance and high conductivity for the hybrid devices. Connecting two hybrid devices in series is able to drive a red LED for more than 3 min after charging for 9 s. This work has demonstrated that the pyramid-like NiSe₂ nanostructure is expected to be an ideal high specific capacity electrode for BSH devices, especially for all-solid-state energy storage devices and portable electronic devices.