Controllable reduction of NiCoO2@NiCo core-shell nanospheres on CNTs for high-performance electrochemical energy storage

B Q Wang; S H Gong; X C Wang; J F Wu; F Liu; J P Cheng

doi:10.1016/j.jcis.2023.04.134

Controllable reduction of NiCoO₂@NiCo core-shell nanospheres on CNTs for high-performance electrochemical energy storage

J Colloid Interface Sci. 2023 Sep:645:154-164. doi: 10.1016/j.jcis.2023.04.134. Epub 2023 Apr 27.

Authors

B Q Wang¹, S H Gong¹, X C Wang², J F Wu³, F Liu¹, J P Cheng⁴

Affiliations

¹ State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Key Laboratory of Advanced Materials and Applications for Batteries of Zhejiang Province, Zhejiang University, Hangzhou 310027, China.
² School of Physics and Microelectronics, Zhengzhou University, Zhengzhou 450052, China.
³ College of Information Science & Technology, Zhejiang Shuren University, Hangzhou 310015, China. Electronic address: wujianfeng@zjsru.edu.cn.
⁴ State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Key Laboratory of Advanced Materials and Applications for Batteries of Zhejiang Province, Zhejiang University, Hangzhou 310027, China. Electronic address: chengjp@zju.edu.cn.

PMID: 37148681
DOI: 10.1016/j.jcis.2023.04.134

Abstract

The performances of energy storage devices are strongly dependent on the electrode materials. Owing to the high theoretical capacity, NiCoO₂ is a promising transition metal oxide for supercapacitors. Despite many efforts have been devoted, it still lacks of effective methods to overcome its shortcomings such as low conductivity and poor stability, in order to achieve its theoretical capacity. Herein, utilizing the thermal reducibility of trisodium citrate and its hydrolyzate, a series of NiCoO₂@NiCo/CNT ternary composites in which NiCoO₂@NiCo core-shell nanospheres deposited on CNT surface with adjustable metal contents are synthesized. Benefiting from the enhanced synergistic effect of both metallic core and CNTs, the optimized composite exhibits an extremely high specific capacitance (2660 F g^-1 at 1 A g^-1, the effective specific capacitance of the loaded metal oxide is 4199 F g^-1, close to the theoretical value), an excellent rate performance and stability, when the metal content is about 37%. After depolarized calculation, the energy storage mechanism of the composite is reasonably analyzed. By controlling the contents of hexamethylenetetramine, trisodium citrate and CNTs in the reactant, the roles of them are distinguished. This study reveals an efficient novel strategy for transition metal oxides to maximize the electrochemical performances.

Keywords: Carbon nanotubes; NiCoO(2); Supercapacitors; Thermal reduction.