Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 780, Issue -, Pages 147-155Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2018.11.334
Keywords
Nickel copper carbonate hydroxide; Carbonate anion intercalation; Chemical manipulation; Supercapacitor
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Funding
- Zhejiang Provincial Natural Science Foundation of China [LY18E020003]
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Transition metal compounds containing nickel and copper have been investigated as electrode materials for energy storage. (Ni,Cu)(OH)(2)CO3 and alpha-Ni(OH)(2) with different Ni/Cu ratios are synthesized by a simple hydrothermal method. All the samples show the similar dandelion-like morphology. It is demonstrated that the mole ratio of Ni to Cu is a key factor to influence the phase and electrochemical performances of the products. Carbonate anions will be intercalated into nickel copper layered double hydroxides with a hydrotalcite structure when the sample is nickel-rich, which will lead to much better electrochemical properties compared with the copper-rich samples with crystalline (Ni,Cu)(OH)(2)CO3 structure. Among all the materials, sample (Ni0.89Cu0.11)(2)(OH)(2)CO3 can deliver the highest specific capacitance of 1017.3 F g(-1 )at 1 A g(-1) and retain 68.5% of the original value after 4000 cycles at 5 A g(-1). Meanwhile, an asymmetric capacitor which is assembled by using the optimized material as a positive electrode and activated carbon as a negative electrode exhibits a high energy density of 38.56 Wh kg(-1) at a power density of 850.01 W kg(-1) and a high power density of 8407.4 W kg(-1) at an energy density of 21.7 Wh kg(-1). Based on the above results, nickel copper carbonate hydroxides are of potential application for energy storage. (C) 2018 Elsevier B.V. All rights reserved.
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