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Core-Shell Structured Cobalt Sulfide/Cobalt Aluminum Hydroxide Nanosheet Arrays for Pseudocapacitor Application.
Cha, Ji-Hyun; Park, Eun Bi; Han, Sang Wook; Kim, Young Dok; Jung, Duk-Young.
Afiliação
  • Cha JH; Department of Chemistry and Sungkyun Advanced Institute of NanoTechnology (SAINT), Sungkyunkwan University, Suwon, 16419, Korea.
  • Park EB; Department of Chemistry and Sungkyun Advanced Institute of NanoTechnology (SAINT), Sungkyunkwan University, Suwon, 16419, Korea.
  • Han SW; Department of Chemistry, Sungkyunkwan University, Suwon, 16419, Korea.
  • Kim YD; Department of Chemistry, Sungkyunkwan University, Suwon, 16419, Korea.
  • Jung DY; Department of Chemistry and Sungkyun Advanced Institute of NanoTechnology (SAINT), Sungkyunkwan University, Suwon, 16419, Korea.
Chem Asian J ; 14(3): 446-453, 2019 Feb 01.
Article em En | MEDLINE | ID: mdl-30565437
The direct synthesis of nanostructured electrode materials on three-dimensional substrates is important for their practical application in electrochemical cells without requiring the use of organic additives or binders. In this study, we present a simple two-step process to synthesize a stable core-shell structured cobalt sulfide/cobalt aluminum hydroxide nanosheet (LDH-S) for pseudocapacitor electrode application. The cobalt aluminum layered double hydroxide (CoAl-LDH) nanoplates were synthesized in basic aqueous solution with a kinetically-controlled thickness. Owing to the facile diffusion of electrolytes through the nanoplates, thin CoAl-LDH nanoplates have higher specific capacitance values than thick nanoplates. The as-grown CoAl-LDH nanoplates were transformed into core-shell structured LDH-S nanosheets by a surface modification process in Na2 S aqueous solution. The chemically robust cobalt sulfide (CoS) shell increased the electrochemical stability compared to the sulfide-free CoAl-LDH electrodes. The LDH-S electrodes exhibited high electrochemical performance in terms of specific capacitance and rate capability with a galvanostatic discharge of 1503 F g-1 at a current density of 2 A g-1 and a specific capacitance of 91 % at 50 A g-1 .
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Chem Asian J Ano de publicação: 2019 Tipo de documento: Article País de publicação: Alemanha

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Chem Asian J Ano de publicação: 2019 Tipo de documento: Article País de publicação: Alemanha