Fe(CN)63− ion-modified MnO2/graphene nanoribbons enabling high energy density asymmetric supercapacitors. Issue 17 (12th April 2018)

• Record Type: Journal Article
• Authors: Sheng, Lizhi; Jiang, Lili; Wei, Tong; Zhou, Qihang; Jiang, Yuting; Jiang, Zimu; Liu, Zheng; Fan, Zhuangjun
• Is Part Of: Journal of materials chemistry. Volume 6:Issue 17(2018)
• Page Start: 7649
• Page End: 7658
• Publication Date: 2018-04-12
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c8ta01375f
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : Fe(CN)6 3− ion-modified MnO2 /graphene ribbons can provide extra pseudocapacitance from the Fe(CN)6 3− /Fe(CN)6 4− redox reaction for high energy density supercapacitors. Abstract : Due to its high theoretical specific capacitance and high oxygen evolution potential, MnO2 has been considered as a promising positive electrode material for high-energy asymmetric supercapacitors (ASCs). However, the search for MnO2 positive electrodes with high specific capacitance and excellent rate performance for ASCs remains challenging. Herein, for the first time we report a novel strategy for the synthesis of Fe(CN)6 3− ion-modified MnO2 /graphene ribbons (m-MnO2 /GRs) as the positive electrode for high energy density ASCs. Benefiting from vertically aligned MnO2 grown on the interconnected graphene ribbon and Fe(CN)6 3− ion modification, the m-MnO2 /GR exhibits a high specific capacitance of 435 F g −1, excellent rate capability and cycling stability. More importantly, the assembled m-MnO2 /GR//GR ASC exhibits a high energy density of 57.8 W h kg −1 at a power density of 1.2 kW kg −1, as well as outstanding cycling stability with 100% capacitance retention after 10 000 cycles. More importantly, such a device can be charged/discharged within 0.79 s in an ultrafast manner to deliver a high specific energy of 10.5 W h kg −1 at an ultrahigh specific power of 48 kW kg −1 . Thus, our strategy could be possibly used for the design and fabrication of new energy storage devices with high energy and power densities for future applications.