Issue 21, 2017

An evenly distributed sulfur-doped nickel zinc hydroxyl carbonate dispersed structure for all-solid-state asymmetric supercapacitors with enhanced performance

Abstract

Herein, rational evenly distributed sulfur-doped nickel zinc hydroxyl carbonate (NZSC) nanoparticles are prepared by a simple two-step hydrothermal method, getting a high degree of dispersion of the nickel zinc hydroxyl carbonate (NZC) precursor and then sulfidizing to increase the conductivity. Meanwhile, its large specific surface area of 226 m2 g−1, resulting in a large number of redox sites, can effectively reduce volume change during the charge–discharge process. As a positive electrode material, NZSC-4 shows a high capacitance value of 1634 F g−1 at 1 A g−1 and outstanding rate performance (73% rate retention at 20 A g−1). What's more, an all-solid-state asymmetric supercapacitor (ASC) was assembled, using NZSC-4 as the positive electrode and activated carbon as the negative electrode. The ASC exhibits a high energy density of 36.17 W h kg−1 from a high voltage range of 0 to 1.7 V at a power density of 0.85 kW kg−1, appropriate leakage current and self-discharge. Interestingly, two fully charged ASCs (in series) can power the white light-emitting diodes (LED, working voltage greater than 3 V) effectively, and subsequently light yellow LED and then red LED after the white bulb consumes part of the energy. Hence, the NZSC-4 as a pseudocapacitive material looks promising.

Graphical abstract: An evenly distributed sulfur-doped nickel zinc hydroxyl carbonate dispersed structure for all-solid-state asymmetric supercapacitors with enhanced performance

Supplementary files

Article information

Article type
Paper
Submitted
23 Mar 2017
Accepted
02 May 2017
First published
02 May 2017

J. Mater. Chem. A, 2017,5, 10227-10235

An evenly distributed sulfur-doped nickel zinc hydroxyl carbonate dispersed structure for all-solid-state asymmetric supercapacitors with enhanced performance

S. Wang, X. Wang, Z. Bao, X. Yang, L. Ye and L. Zhao, J. Mater. Chem. A, 2017, 5, 10227 DOI: 10.1039/C7TA02558K

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