Direct growth of NiCo 2 O 4 nanosheet arrays on 3D-Ni-modified CFs for enhanced electrochemical storage in flexible supe
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Direct growth of NiCo2O4 nanosheet arrays on 3D-Nimodified CFs for enhanced electrochemical storage in flexible supercapacitors Huanhuan Li1, Zhihang Feng1, Hongwei Che1, Yifan Liu1, Zengcai Guo1,*, Xiaoliang Zhang1, Zhixiao Zhang1, Yanming Wang1, and Jingbo Mu1,* 1
Institute of Novel Materials for Energy and Environment, College of Materials Science and Engineering, Hebei University of Engineering, Handan 056038, People’s Republic of China
Received: 26 April 2020
ABSTRACT
Accepted: 25 August 2020
The rapid development of wearable and portable smart equipment has led to a research boom in flexible energy storage devices. Herein, NiCo2O4 nanosheet arrays have been successfully grown on carbon fibers (CFs), which was firstly modified by the three-dimensional Ni (3D-Ni) to repair the cracks and grooves in the surface of CF. The obtained CFs@3D-Ni/NiCo2O4 electrode possesses a high specific capacity of 736 F/g at 1 A/g current density in the three-electrode system. More importantly, the composite showed excellent electrochemistry stability after temperature plummets. The all-solid-state asymmetric supercapacitor device (ASC) assembled by CFs@3D-Ni/NiCo2O4 delivers a wonderful specific capacity of 176 F/g, a high energy density 55 W h/Kg at 750 W/Kg, excellent cycling stability (about 97.84% after 2000 cycles), and high flexibility (almost no influence in electrical performance at various bending angles). This work has provided a promising method to prepare high performance of the flexible and lightweight energy storage equipment.
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Springer Science+Business
Media, LLC, part of Springer Nature 2020
1 Introduction As one of the smart and portable electronic devices for wearable electronics, flexible supercapacitors have attracted significant concerns due to their compact size, excellent mechanical flexibility, high energy, and power density. Nowadays, numerous attempts have been devoted on developing flexible electrodes to meet the requirement of novel flexible and wearable electronic devices. In the past years,
metals (Ni, Ti, Cu, etc.,) are made as substrate materials to fabricate flexible supercapacitors due to their excellent conductivity [1–3], while, these electrodes bear the low energy density on account of the cumbersome metal current collectors. Therefore, searching of suitable flexible current collector with lightweight, such as cellulose paper, graphene, CNT, carbon fibers (CFs), and so forth have been widely receiving significant attention, in particular, CFs, which possess outstanding electric conductivity, light
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https://doi.org/10.1007/s10854-020-04341-3
J Mater Sci: Mater Electron
weight, good chemical/physical stability, and large surface area, have attracted much attention for the realization of high performance of flexible electrodes. Many researches have focus on designing and synthesizing of metal oxides or sulfides on CFs to meet the high mechanical strength for future sustainable energy storage [4–7]. Neverth
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