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From Crystalline to Partially Amorphous: A Facile Strategy toward Sulfur Vacancy‐Enriched CoNi2S4 Nanosheets with Improved Supercapacitor Performance

From Crystalline to Partially Amorphous: A Facile Strategy toward Sulfur Vacancy‐Enriched CoNi2S4... Supercapacitors (SCs) are considered to be a promising energy storage technology due to their superior electrochemical properties. However, to meet the continuously rising demands of energy density, SCs need to be equipped with high specific capacitance. For this purpose, partially amorphous CoNi2S4 nanosheets grown directly on nickel foam (PA‐CoNi2S4/NF) are successfully synthesized via a facile solvothermal method combined with follow‐up KBH4 treating. The nanosheets structure optimizes the ion transport path and the amorphous crystals endow PA‐CoNi2S4/NF with numerous sulfur vacancies. Therefore, the as‐prepared PA‐CoNi2S4/NF possess high specific capacitance (3305 F g–1 at 2 A g–1) and excellent capacitance retention of 66.4% when the current density increases from 2 to 100 A g–1. In addition, an asymmetric supercapacitor device composed of PA‐CoNi2S4/NF as a positive electrode and activated carbon as a negative electrode exhibits a high energy density of 43.4 Wh kg–1 at a power density of 800.4 W kg–1, as well as excellent long‐term cyclic stability. This work offers a simple approach for the fabrication of transition metal sulfide materials with high electrochemical activities in SCs and other electrochemical energy‐related fields. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Advanced Sustainable Systems Wiley

From Crystalline to Partially Amorphous: A Facile Strategy toward Sulfur Vacancy‐Enriched CoNi2S4 Nanosheets with Improved Supercapacitor Performance

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References (43)

Publisher
Wiley
Copyright
© 2022 Wiley‐VCH GmbH
eISSN
2366-7486
DOI
10.1002/adsu.202100414
Publisher site
See Article on Publisher Site

Abstract

Supercapacitors (SCs) are considered to be a promising energy storage technology due to their superior electrochemical properties. However, to meet the continuously rising demands of energy density, SCs need to be equipped with high specific capacitance. For this purpose, partially amorphous CoNi2S4 nanosheets grown directly on nickel foam (PA‐CoNi2S4/NF) are successfully synthesized via a facile solvothermal method combined with follow‐up KBH4 treating. The nanosheets structure optimizes the ion transport path and the amorphous crystals endow PA‐CoNi2S4/NF with numerous sulfur vacancies. Therefore, the as‐prepared PA‐CoNi2S4/NF possess high specific capacitance (3305 F g–1 at 2 A g–1) and excellent capacitance retention of 66.4% when the current density increases from 2 to 100 A g–1. In addition, an asymmetric supercapacitor device composed of PA‐CoNi2S4/NF as a positive electrode and activated carbon as a negative electrode exhibits a high energy density of 43.4 Wh kg–1 at a power density of 800.4 W kg–1, as well as excellent long‐term cyclic stability. This work offers a simple approach for the fabrication of transition metal sulfide materials with high electrochemical activities in SCs and other electrochemical energy‐related fields.

Journal

Advanced Sustainable SystemsWiley

Published: Jan 1, 2022

Keywords: asymmetric supercapacitors; partially amorphous; specific capacitance; sulfur vacancies

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