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Nanoscale 2020
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.
Advanced Sustainable Systems – Wiley
Published: Jan 1, 2022
Keywords: asymmetric supercapacitors; partially amorphous; specific capacitance; sulfur vacancies
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