Rational design of hierarchically nanostructured NiTe@CoxSy composites for hybrid supercapacitors with impressive rate capability and robust cycling durableness

Keying Cui; Lange Du; Weimin Du; Lili Cui; Yufan Zhang; Weiling Chen; Chee Tong John Low; Jiantao Zai

doi:10.1016/j.jcis.2023.04.037

Rational design of hierarchically nanostructured NiTe@CoxSy composites for hybrid supercapacitors with impressive rate capability and robust cycling durableness

J Colloid Interface Sci. 2023 Aug:643:292-304. doi: 10.1016/j.jcis.2023.04.037. Epub 2023 Apr 13.

Authors

Keying Cui¹, Lange Du², Weimin Du³, Lili Cui⁴, Yufan Zhang⁴, Weiling Chen⁴, Chee Tong John Low⁵, Jiantao Zai⁶

Affiliations

¹ School of Chemistry and Chemical Engineering, Anyang Normal University, Anyang, Henan 455002, China; College of Chemistry, Zhengzhou University, Zhengzhou, Henan 450001, China.
² College of International Education, Henan Normal University, Xinxiang, Henan 453002, China.
³ School of Chemistry and Chemical Engineering, Anyang Normal University, Anyang, Henan 455002, China. Electronic address: dwmchem@163.com.
⁴ School of Chemistry and Chemical Engineering, Anyang Normal University, Anyang, Henan 455002, China.
⁵ Warwick Electrochemical Engineering Group, Energy Innovation Centre, WMG, University of Warwick, Coventry CV4 7AL, UK.
⁶ School of Chemistry and Chemical Technology, Shanghai Jiao Tong University, Shanghai 200240, China. Electronic address: zaijiantao@sjtu.edu.cn.

PMID: 37075538
DOI: 10.1016/j.jcis.2023.04.037

Abstract

The hierarchically nanostructured NiTe@CoxSy composites are constructed on a foamed nickel substrate by a two-step electrode preparation process. Structural characterization shows the dense growing of CoxSy nanosheets around NiTe nanorods forms a hierarchical nanostructure which possesses synergetic effects from both compositional and structural complementarity, more pathways for ion/electrolyte transport, richer redox active sites, and better conductivity. Thanks to the rational design of this hierarchical structure, NiTe@CoxSy delivers a high areal capacitance of 7.7F cm^-2 at 3 mA cm^-2 and achieves the improved capacitance retention of 97.9% after 10,000 cycles. Of particular importance is the successful fabrication of NiTe@CoxSy//activated carbon hybrid supercapacitors. This hybrid device has a wide operating voltage window, high areal energy density of 0.48 mWh cm^-2 at 2.55 mW cm^-2, impressive rate capability of 62.3% even after a 20-fold increase of the current density, and a 115.1% of initial capacitance retention after 15,000 cycles. Meanwhile, two tandem such hybrid devices can easily drive a pair of mini fans or light up a heart-like pattern assembled by 10 red LEDs. These experimental results not only demonstrate that the hierarchically nanostructured NiTe@CoxSy composites can serve as a prospective candidate electrode; but also develop a novel strategy about how to achieve high-performance stockpile equipment by rationale designing a desirable nanostructures.

Keywords: Bi-synergy; CoxSy; Hierarchical nanostructure; Hybrid supercapacitors; NiTe.