In-situ synthesis of Ni-MOF@CNT on graphene/Ni foam substrate as a novel self-supporting hybrid structure for all-solid-state supercapacitors with a high energy density

• Published in: Journal of electroanalytical chemistry (Lausanne, Switzerland) Vol. 848; p. 113301
• Main Authors: Yang, Jie, Li, Pengfa, Wang, Liujie, Guo, Xiaowei, Guo, Jiao, Liu, Sheng
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01-09-2019; Elsevier Science Ltd
• Subjects: All-solid-state supercapacitors; CNT; Electrochemical analysis; Electrode materials; Electron transport; Flux density; Graphene; Hybrid structures; Metal foams; MOF; Self-supporting; Solid state; Substrates; Supercapacitors; All-solid-state supercapacitors; CNT; Self-supporting; MOF
• ISSN: 1572-6657; 1873-2569
• DOI: 10.1016/j.jelechem.2019.113301

A new hybrid structure of Ni-MOF and CNT (Ni-MOF@CNT) was firstly in-situ synthesized on the graphene/Ni foam (GN) substrate and a novel self-supporting material of Ni-MOF@CNT/GN was obtained. Furthermore, its application as a new electrode material for all-solid-state supercapacitors was also investigated for the first time. An ultrahigh energy density of 0.3396 mWhcm−2 can be achieved as the best value reported for MOF-based all-solid-state supercapacitors to date. Moreover, high capacitance values of 898 and 230 mFcm−2 can be obtained at 1 and 20 mAcm−2, respectively, and a high retention value of 93% can be also maintained even after 4000cycles. Such a high electrochemical performance may be ascribed to high conductivity of the CNT, electron transport effect of the graphene layer, porous characteristic of the Ni-MOF@CNT/GN material and changes of oxygen-containing groups in the hybrid structure.
A new self-supporting hybrid structure of Ni-MOF@CNT/GN firstly synthesized was and exhibited an ultra-high energy density of 0.3396 mWhcm−2. [Display omitted]
•A new self-supporting hybrid structure of Ni-MOF@CNT/GN was synthesized.•This material was used as a new electrode material for all-solid-state supercapacitors for the first time.•The assembled asymmetric supercapacitor displayed an ultrahigh energy density of 0.3396 mWhcm-2.