An evenly distributed sulfur-doped nickel zinc hydroxyl carbonate dispersed structure for all-solid-state asymmetric supercapacitors with enhanced performance. Issue 21 (10th May 2017)

• Record Type: Journal Article
• Authors: Wang, Shaohua; Wang, Xuemeng; Bao, Zepei; Yang, Xijia; Ye, Lin; Zhao, Lijun
• Is Part Of: Journal of materials chemistry. Volume 5:Issue 21(2017)
• Page Start: 10227
• Page End: 10235
• Publication Date: 2017-05-10
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c7ta02558k
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : Assembly diagram of an all-solid-state asymmetric supercapacitor and its practical application. 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 m 2 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.