文献类型：期刊文献

英文题名：Roe-shaped Ni3(PO4)2/RGO/Co3(PO4)2 (NRC) nanocomposite grown in situ on Co foam for superior supercapacitors

作者：Zhao, Chongjun[1];Wang, Shengqi[1];Zhu, Zhaoqiang[1];Ju, Peiwen[1];Zhao, Chunhua[1];Qian, Xiuzhen[1]

机构：[1]East China Univ Sci & Technol, Shanghai Key Lab Adv Polymer Mat, Sch Mat Sci & Engn, Key Lab Ultrafine Mat,Minist Educ, Shanghai 200237, Peoples R China

年份：2017

卷号：5

期号：35

起止页码：18594

外文期刊名：JOURNAL OF MATERIALS CHEMISTRY A

收录：;EI(收录号：20173804181695);WOS:【SCI-EXPANDED(收录号:WOS:000410597200030)】；

基金：We are grateful for the support of the Shanghai Natural Science Foundation (No. 13ZR1411900), Shanghai Leading Academic Discipline Project (B502), and Shanghai Key Laboratory Project (08DZ2230500).

语种：英文

外文关键词：Cobalt deposits - Redox reactions - Capacitance - Cobalt - Hydrothermal synthesis - Supercapacitor - Cobalt compounds - Nanocomposites - Nickel compounds - Solutions

摘要：A roe-shaped ternary nanocomposite, Ni-3(PO4)(2)/RGO/Co-3(PO4)(2) (NRC), was grown in situ on cobalt foam (CoF). The synthesis and loading of NRC on the CoF was completed through a one-step hydrothermal process by immersing the CoF in an aqueous solution of GO and Ni2+ in the presence of H2PO4-, in which the CoF served as the support, reductant and Co source. Three interfaces of Co-3(PO4)(2)/CoF, RGO/Co-3(PO4)(2), and Ni-3(PO4)(2)/RGO with strong interactions were constructed based on an in situ conversion reaction of Co to Co-3(PO4)(2), a redox reaction between GO and the CoF, and the electrostatic attraction force of Ni2+ and GO, respectively. The as-synthesized NRC@CoF had a hierarchically porous structure, and directly acted as a supercapacitor electrode and delivered excellent electrochemical performances: a specific capacitance of 10 237.5 mF cm(-2) (1137.5 F g(-1)) at 5 mA cm(-2) (0.56 A g(-1)) with a capacity retention of 117.8% after 14 000 cycles. Furthermore, NRC@CoF-based asymmetric supercapacitors (ASCs) exhibited a specific capacitance of 4845.9 mF cm(-2) (115.4 F g(-1)) at 5 mA cm(-2) (0.12 A g(-1)), and a high energy density of 44.82 W h kg(-1) at a power density of 428.6 W kg(-1), as well as good cyclic stability (91.9% after 18 000 cycles).