Construction of hierarchical nickel cobalt sulfide@manganese oxide nanoarrays@nanosheets core‐shell electrodes for high‐performance electrochemical asymmetric supercapacitor. (27th October 2021)

• Record Type: Journal Article
• Authors: Parale, Vinayak G.; Kim, Taehee; Patil, Amar M.; Phadtare, Varsha D.; Choi, Haryeong; Dhavale, Rushikesh P.; Kim, Younghun; Jun, Seong Chan; Park, Hyung‐Ho
• Is Part Of: International journal of energy research. Volume 46:Number 4(2022)
• Page Start: 5250
• Page End: 5259
• Publication Date: 2021-10-27
• Subjects: asymmetric electrochemical supercapacitor -- high specific energy -- hydrothermal -- NiCo2S4@MnOx core‐shell nanostructure; Power resources -- Periodicals; Power (Mechanics) -- Periodicals; Power resources -- Research -- Periodicals; 621.042
• DOI: 10.1002/er.7413
• Languages: English
• ISSNs: 0363-907X

Abstract

Summary: Core‐shell nanostructured three‐dimensional binderless electrode porosity makes them ideal candidates for electrochemical energy storage applications. This article proposes NiCo2 S4 @MnOx electrodes fabricated using a facile hydrothermal approach and subsequently annealed at 120°C for 12 hours. The resultant nanoarrays@nanosheets structure allows rapid ion and electron transport. Coating with pseudocapacitive MnOx on NiCo2 S4 nanoarrays improves overall capacitance, and the amorphous MnOx nanosheets promote electrode cycling stability. The proposed NiCo2 S4 @MnOx electrode achieved excellent specific capacitance of 1640 F·g −1 at 5 mA·cm −2 and cyclic stability ≈ 90%; and the subsequently fabricated asymmetric electrochemical supercapacitor achieved specific capacitance ~96.91 F·g −1, and specific energy (SE) 26.38 Wh·kg −1 at specific power (SP) 466.66 W·kg −1, with impressive electrochemical stability ≈ 80% over 5000 charge/discharge cycles. Abstract : Hierarchical NiCo2 S4 @MnOx nanoarrays@nanosheets are prepared by simple hydrothermal and solvothermal methods with high electrode capacitance and excellent electrochemical cyclic stability for high‐performance asymmetric supercapacitors. No previous study reported including amorphous MnOx synthesis using the proposed synthesis method, which acts as a protective layer to enhance NiCo2 S4 electrochemical performance. Electrode specific energy and potential window can be widened by fabricating a core‐shell structure with battery‐like NiCo2 S4 and pseudocapacitive MnOx .