Journal
ELECTROCHIMICA ACTA
Volume 322, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2019.134747
Keywords
Nickel hydroxide; Film electrode; In situ doping; Cathodic electrodeposition
Categories
Funding
- Fundamental Research Funds for the Central Universities of Central South University [2019zzts445]
- Natural Science Foundation of Hunan Province [2017JJ2347, 2019JJ50794]
- National Natural Science Foundation of China [21406273]
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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. (C) 2019 Elsevier Ltd. All rights reserved.
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