A novel open architecture built by ultra-fine single-crystal Co2(CO3)(OH)2 nanowires and reduced graphene oxide for asymmetric supercapacitors. Issue 43 (21st October 2016)

• Record Type: Journal Article
• Authors: Leng, Xuning; Wu, Libo; Liu, Yan; Li, Chunlin; Wei, Sufeng; Jiang, Zhonghao; Wang, Guoyong; Lian, Jianshe; Jiang, Qing
• Is Part Of: Journal of materials chemistry. Volume 4:Issue 43(2016)
• Page Start: 17171
• Page End: 17179
• Publication Date: 2016-10-21
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c6ta07112k
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : A self-assembled novel open architecture based on ultra-fine single-crystal Co2 (CO3 )(OH)2 nanowires and reduced graphene oxide shows enhanced supercapacitive performance. Abstract : Recently, hydroxyl-carbonates have drawn increasing interest in energy storage because of their special layered structure and pseudocapacitive character. In this work, a novel open architecture based on reduced graphene oxide and ultra-fine single-crystal Co2 (CO3 )(OH)2 nanowires (designed as rGO/Co2 (CO3 )(OH)2 ) is synthesized via mutual electrostatic interactions benefiting from their intrinsic opposite charges. Taking advantage of the high conductivity of rGO, the ultra-fine diameter of the nanowires, and the open network of the architecture, the rGO/Co2 (CO3 )(OH)2 electrode exhibits high specific capacitance (998 F g −1 at 1 A g −1 and 727 F g −1 at 20 A g −1 ) with excellent rate capability and stability (98.3% capacitance retention after 4000 cycles). An asymmetric supercapacitor fabricated by using it as the positive electrode and activated carbon as the negative electrode has demonstrated high energy/power density (26.7 W h kg −1 at 751 W kg −1 and 13.1 W h kg −1 at 15 362 W kg −1 ) and outstanding cycle stability (10 000 times with only 5.4% loss).