One-step electrodeposition synthesis of high performance carbon nanotubes/graphene-doped Ni(OH)2 thin film electrode for high-performance supercapacitor. (1st November 2019)

• Record Type: Journal Article
• Authors: Han, Chong; Cao, Weiyi; Si, Huizheng; Wu, Yu; Liu, Kaiyu; Liu, Hongtao; Sang, Shangbin; Wu, Qiumei
• Is Part Of: Electrochimica acta. Volume 322(2019)
• Publication Date: 2019-11-01
• Subjects: Nickel hydroxide -- Film electrode -- In situ doping -- Cathodic electrodeposition; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2019.134747
• Languages: English
• ISSNs: 0013-4686

Abstract

Abstract: In this work, we successfully synthesized Ni(OH)2 thin film electrode in situ doped with CNTs/rGO by cathodic electrodeposition on titanium mesh. The doping effects of CNTs and/or rGO, and the technical conditions, are investigated. The doping of CNTs/rGO can greatly improve the electrochemical performance by forming the porous structure and the conductive network in the Ni(OH)2 thin film. The highest capacity, 429.5 mAh/g at a current density of 5 A/g, is achieved for the electrode with 0.24 mg/cm 2 Ni(OH)2 and codoped with CNTs and rGO, as compared with only 323.9 mAh/g for undoped electrode. Even at 100 A/g, the specific capacity can still remain 347.5 mAh/g (vs. 221.5 mAh/g for the undoped electrode), and after 1000 cycles, the retention rate of the specific capacity is 74.9% as compared with only 42.7% for the undoped electrode. Even with higher loading amounts of 1.92 mg/cm 2 Ni(OH)2, the specific capacity retention rate of the codoped electrode is still much higher than that of the undoped electrode. The high electrochemical performance can be attributed to the better ion/electron transfer ability of the codoped electrode. In conclusion, by the cathodic electrodeposition and in situ doping of CNTs/rGO, the porous structure and the conductive network in Ni(OH)2 film can be constructed, which can improve the ion/electron transfer ability, therefore, the high performance film electrode with higher loading amount of Ni(OH)2 can be prepared.