Battery-like supercapacitors from diamond networks and water-soluble redox electrolytes. Issue 4 (6th January 2017)

• Record Type: Journal Article
• Authors: Yu, Siyu; Yang, Nianjun; Zhuang, Hao; Mandal, Soumen; Williams, Oliver A.; Yang, Bing; Huang, Nan; Jiang, Xin
• Is Part Of: Journal of materials chemistry. Volume 5:Issue 4(2017)
• Page Start: 1778
• Page End: 1785
• Publication Date: 2017-01-06
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c6ta08607a
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : Battery-like supercapacitors fabricated with a 3D diamond network and water-soluble redox electrolytes exhibit large capacitances and high energy and power densities. Abstract : Enhanced performance of electrochemical capacitors can be achieved by larger capacitances as well as higher power and energy densities. In this work, such battery-like supercapacitors were fabricated using a three-dimensional and conductive diamond network as the capacitor electrode and water-soluble redox couples as the electrolyte. In 0.05 M Fe(CN)6 3−/4− + 1.0 M Na2 SO4 aqueous solution, a capacitance of 73.42 mF cm −2 was obtained at a current density of 1 mA cm −2 . This value is 10 000 times higher than the capacitance of diamond electric double layer capacitors (EDLCs). The energy and power densities of a fabricated diamond network symmetric pseudocapacitor were up to 56.50 W h kg −1 and 13.7 kW kg −1, respectively. Compared with those of diamond EDLCs obtained with the same cell voltage, they are enhanced about 3500 and 1440 fold, respectively. Therefore the combination of diamond networks and water-soluble redox electrolytes is a novel approach to construct electrochemical capacitors and thus bridges the gap between normal dielectric capacitors and rechargeable batteries.