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

Author:
Meng, Lu, Wu, Yuhao, Zhang, Tian, Tang, Haichao, Tian, Yang, Yuan, Yuliang, Zhang, Qinghua, Zeng, Yujia, Lu, Jianguo
Source:
Journal of materials science 2019 v.54 no.1 pp. 571-581
ISSN:
0022-2461
Subject:
activated carbon, electrochemistry, electrodes, electronic equipment, energy, energy density, nanomaterials
Abstract:
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.
Agid:
6163751