The synthesis of hierarchical ZnCo2O4@MnO2 core–shell nanosheet arrays on Ni foam for high-performance all-solid-state asymmetric supercapacitors. Issue 3 (19th January 2018)

• Record Type: Journal Article
• Authors: Yu, Deyang; Zhang, Ziqing; Meng, Ya'nan; Teng, Yifei; Wu, Yunpeng; Zhang, Xinyang; Sun, Qiushi; Tong, Wenming; Zhao, Xudong; Liu, Xiaoyang
• Is Part Of: Inorganic chemistry frontiers. Volume 5:Issue 3(2018)
• Page Start: 597
• Page End: 604
• Publication Date: 2018-01-19
• Subjects: Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/c7qi00706j
• Languages: English
• ISSNs: 2052-1553

Abstract

Abstract : ZnCo2 O4 @MnO2 core–shell nanosheet arrays synthesized via a two-step hydrothermal method exhibited an extraordinary electrochemical performance. Abstract : Hierarchical ZnCo2 O4 @MnO2 core–shell nanosheet arrays were successfully synthesized on Ni foam via a facile hydrothermal method followed by a calcination process. The fabricated ZnCo2 O4 @MnO2 electrode exhibited a specific capacitance as high as 2170.00 F g −1 (2.60 F cm −2 ) at a current density of 3 mA cm −2 in a 1 M KOH solution. Furthermore, an all-solid-state asymmetric supercapacitor (ASC) device fabricated with the as-prepared ZnCo2 O4 @MnO2 as the positive electrode and activated carbon (AC) as the negative electrode in the PVA/KOH gel electrolyte achieved a high energy density of 29.41 W h kg −1 at a power density of 628.42 W kg −1 and retained 95.3% of its initial capacitance after 3000 cycles at a high current density of 10 mA cm −2 . With the smart design and remarkable electrochemical properties, the hierarchical ZnCo2 O4 @MnO2 core–shell nanosheet arrays on Ni foam demonstrated great potential for further applications in the energy storage field.