Nanoporous structure synthesized by selective phase dissolution of AlCoCrFeNi high entropy alloy and its electrochemical properties as supercapacitor electrode

Fabrication of nanoporous metal core/oxide shell structure using equiatomic AlCoCrFeNi high entropy alloy (HEA) and its electrochemical property as supercapacitor electrode have been investigated in the present study. As-cast AlCoCrFeNi HEA consists of interconnected Al–Ni rich and Cr–Fe rich phases...

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Published in:Journal of power sources Vol. 437; p. 226927
Main Authors: Kong, Kyeongho, Hyun, Jaeik, Kim, Yongjoo, Kim, Wontae, Kim, Dohyang
Format: Journal Article
Language:English
Published: Elsevier B.V 15-10-2019
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Abstract Fabrication of nanoporous metal core/oxide shell structure using equiatomic AlCoCrFeNi high entropy alloy (HEA) and its electrochemical property as supercapacitor electrode have been investigated in the present study. As-cast AlCoCrFeNi HEA consists of interconnected Al–Ni rich and Cr–Fe rich phases by spinodal phase separation. Nanoporous structure can be obtained by selectively dissolving the Al–Ni rich phase and retaining the remaining Cr–Fe rich phase by passivation in sulfuric acid solution at 313 K. In particular, the scale of nanoporous structure in the present study is predictable since it only depends on the scale of original spinodal-decomposed microstructure in as-cast state. When used as a binder free electrode for supercapacitor, Cr–Fe rich nanoporous structure exhibits high volumetric capacitance of 700 F cm−3 and excellent cycling stability of over 3000 cycle. As the microstructural scale in as-cast state becomes finer, the nanoporous structure exhibits better capacitance properties. The present result shows that Cr–Fe rich nanoporous metal core/oxide shell has a good potential for application as supercapacitor electrode. •AlCoCrFeNi HEA consists of interconnected Al–Ni rich and Cr–Fe rich phase.•Nanoporous structure is fabricated by selective dissolution of AlCoCrFeNi HEA.•Nanoporous HEAs exhibits good electrochemical property for supercapacitor.
AbstractList Fabrication of nanoporous metal core/oxide shell structure using equiatomic AlCoCrFeNi high entropy alloy (HEA) and its electrochemical property as supercapacitor electrode have been investigated in the present study. As-cast AlCoCrFeNi HEA consists of interconnected Al–Ni rich and Cr–Fe rich phases by spinodal phase separation. Nanoporous structure can be obtained by selectively dissolving the Al–Ni rich phase and retaining the remaining Cr–Fe rich phase by passivation in sulfuric acid solution at 313 K. In particular, the scale of nanoporous structure in the present study is predictable since it only depends on the scale of original spinodal-decomposed microstructure in as-cast state. When used as a binder free electrode for supercapacitor, Cr–Fe rich nanoporous structure exhibits high volumetric capacitance of 700 F cm−3 and excellent cycling stability of over 3000 cycle. As the microstructural scale in as-cast state becomes finer, the nanoporous structure exhibits better capacitance properties. The present result shows that Cr–Fe rich nanoporous metal core/oxide shell has a good potential for application as supercapacitor electrode. •AlCoCrFeNi HEA consists of interconnected Al–Ni rich and Cr–Fe rich phase.•Nanoporous structure is fabricated by selective dissolution of AlCoCrFeNi HEA.•Nanoporous HEAs exhibits good electrochemical property for supercapacitor.
ArticleNumber 226927
Author Kim, Yongjoo
Kim, Dohyang
Kong, Kyeongho
Hyun, Jaeik
Kim, Wontae
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  givenname: Wontae
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  surname: Kim
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  email: dohkim@yonsei.ac.kr
  organization: Department of Materials Science & Engineering, Yonsei University, Seoul, 03722, Republic of Korea
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Snippet Fabrication of nanoporous metal core/oxide shell structure using equiatomic AlCoCrFeNi high entropy alloy (HEA) and its electrochemical property as...
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SubjectTerms High entropy alloy
Nanoporous
Selective dissolution
Supercapacitor
Title Nanoporous structure synthesized by selective phase dissolution of AlCoCrFeNi high entropy alloy and its electrochemical properties as supercapacitor electrode
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