Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 582, Issue -, Pages 842-851Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2020.08.097
Keywords
Cobalt-nickel layered hydroxide; Benzoate anions-intercalation; Nanobelt; Co-precipitation; Supercapacitors
Categories
Funding
- National Natural Science Foundation of China [21101176, 21676036]
- Fundamental Research Funds for the Central Universities of Chongqing University [2018CDQYCH0028, 2018CDXYHG0028, 2019CDXYHG0013]
- Graduate Research and Innovation Foundation of Chongqing [CYS-18032]
- Large-scale Equipment Sharing Fund of Chongqing University [201903150149, 202003150020]
- National Science Foundation [CHE-2003685, CHE-1900235]
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In this study, a cobalt-nickel layered hybrid organic-inorganic LHS intercalated with benzoate anions was synthesized and showed high performance as electrode materials for HSCs. The synergistic interactions of anions and multi-metallic components in B-CoNi-LHSs resulted in high specific capacity, excellent rate performance, and outstanding cycling performance.
Layered metal hydroxide salts (LHSs) have recently gained extensive interests as an efficient electrode material for supercapacitors (SCs). Herein, we report, for the first time ever, the synthesis of a cobalt-nickel layered hybrid organic-inorganic LHS that was intercalated with benzoate anions (B-CoNi-LHSs) and observe a high performance as electrode materials for hybrid supercapacitors (HSCs). B-CoNi-LHSs were synthesized by using a co-precipitation method, where sodium benzoate was added dropwise to cobalt and nickel salt solution, without the addition of any organic solvent or surfactant. Due to the intercalation of anions and synergistic interactions of the multi-metallic components, the B-CoNi-LHSs electrode showed a high specific capacity of 570 C g(-1) (specific capacitance of 1267 F.g(-1)) at 1 A g(-1), excellent rate performance (65% from 1 to 10 A g(-1)) and outstanding cycling performance (81.09% over 8000 cycles), in comparison to the mono-metallic counterparts. An HSC device, assembled by using B-CoNi-LHSs as the positive electrode and activated carbon (AC) as the negative one, exhibited a power density of 780 W kg(-1) at the energy density of 31.7 Wh kg(-1), and 8543 W kg(-1) at 18.1 Wh kg(-1). Results from this study show that the organic-inorganic hybrids of layered dual-metal hydroxides intercalated with benzoate anions may be a viable candidate as electrode materials for high-performance SCs. (C) 2020 Elsevier Inc. All rights reserved.
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