In Situ Growth of Zeolitic Imidazolate Framework‐67‐derived Nanoporous Carbon@K0.5Mn2O4 for High‐Performance 2.4 V Aqueous Asymmetric Supercapacitors. Issue 18 (10th August 2018)

• Record Type: Journal Article
• Authors: Wei, Xijun; Peng, Huarong; Li, Yanhong; Yang, Yibin; Xiao, Shenghuan; Peng, Li; Zhang, Yunhuai; Xiao, Peng
• Is Part Of: ChemSusChem. Volume 11:Issue 18(2018)
• Page Start: 3167
• Page End: 3174
• Publication Date: 2018-08-10
• Subjects: asymmetric -- aqueous -- nanoporous carbon -- supercapacitors -- ZIF-67; Green chemistry -- Periodicals; Sustainable engineering -- Periodicals; Chemistry -- Periodicals; Chemical engineering -- Periodicals; 660
• DOI: 10.1002/cssc.201801439
• Languages: English
• ISSNs: 1864-5631

Abstract

Abstract: Aqueous asymmetric supercapacitors (ASCs) with a wide voltage window can effectively improve energy storage capacity of energy storage devices. Zeolitic imidazolate framework‐67 (ZIF‐67) was used as a precursor to prepare nanoporous carbon (NC), and K0.5 Mn2 O4 nanosheets were subsequently grown on the NC surface through a facile in situ redox process (denoted as NCMO). The electrode potential window of NCMO was extended to 1.2 V in a three‐electrode system and the value of the potential window was higher than that of most reported manganese oxides. To assemble the asymmetric supercapacitor with a high voltage range, the as‐prepared NCMO and NC (with a potential window of −1.2–0 V) were used as the positive and negative electrode, respectively. A 2.4 V NCMO//NC aqueous ASC was constructed and displayed a large energy density of 60 Wh kg −1 at a power density of 1200 W kg −1 and excellent rate performance (41 Wh kg −1 even at a specific power density of 12.3 kW kg −1 ) as well as good cycling stability (92.6 % capacitance retention over 10 000 cycles at 10 A g −1 ). This work provides new opportunities for the development of high voltage ASCs with a high energy density for further practical application. Abstract : Asymmetric supercapacitors ! Nanoporous carbon@K0.5 Mn2 O4 (NCMO) was prepared through an in situ redox process. NCMO was used as a positive electrode and combined with NC as a negative electrode to prepare NCMO||NC aqueous asymmetric supercapacitors with an ultrawide voltage range of 0–2.4 V, energy density of 60 Wh kg −1 at a power density of 1200 W kg −1 and excellent rate performance of 41 Wh kg −1 .