Issue 33, 2021

Controllable architecture of the NiCoZnS@NiCoFe layered double hydroxide coral-like structure for high-performance supercapacitors

Abstract

The rational design of the morphological structure of electrode materials is considered as an important strategy to obtain high-performance supercapacitors. So, NiCoZnS materials with different Ni/Co/Zn molar ratios on Ni foam (NF) were synthesized, in which the Ni/Co/Zn molar ratio plays a key role in the morphological structure and electrochemical performances. Furthermore, the pre-prepared NiCoZnS materials act as substrates to guide the self-assembling of NiCoFe layered double hydroxide (LDH) nanosheets on the substrate surface to form core–shell electrode materials (NiCoZnS@NiCoFe-LDH) with a 3D mesoporous hierarchical network structure for further improving electrochemical performances. The unique interconnected coral-like NiCoZnS1@NiCoFe-LDH with a large specific surface area (93.1 m2 g−1) and high specific capacitance is achieved at the Ni/Co/Zn molar ratio of 1 : 1 : 1. Benefiting from the unique structural feature and respective merits of the NiCoZnS and NiCoFe-LDH, the NiCoZnS1@NiCoFe-LDH demonstrates an ultrahigh specific capacitance of 1524.0 C g−1 (3386.7 F g−1) at 1.0 A g−1 and excellent 95.0% capacitance retention at 10 A g−1 after 5000 cycles. As for practical application, the assembled NiCoZnS1@NiCoFe-LDH//AC delivers a favorable energy density of 66.25 W h kg−1 at 1500 W kg−1 and a long-term cycling lifetime (86.04% retention at 5.0 A g−1 after 10 000 cycles), which suggests promising potential in energy storage and conversion.

Graphical abstract: Controllable architecture of the NiCoZnS@NiCoFe layered double hydroxide coral-like structure for high-performance supercapacitors

Supplementary files

Article information

Article type
Paper
Submitted
22 Apr 2021
Accepted
15 Jun 2021
First published
05 Aug 2021

Dalton Trans., 2021,50, 11542-11554

Controllable architecture of the NiCoZnS@NiCoFe layered double hydroxide coral-like structure for high-performance supercapacitors

S. Lv, H. Zeng, K. Zou, S. Xu, Y. Long, H. Li and Z. Li, Dalton Trans., 2021, 50, 11542 DOI: 10.1039/D1DT01329G

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