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Article: Reversible electrochemical actuation of metallic nanohoneycombs induced by pseudocapacitive redox processes

TitleReversible electrochemical actuation of metallic nanohoneycombs induced by pseudocapacitive redox processes
Authors
Issue Date2015
PublisherAmerican Chemical Society. The Journal's web site is located at http://pubs.acs.org/journals/ancac3/index.html
Citation
ACS Nano, 2015, v. 9 n. 4, p. 3984-3995 How to Cite?
AbstractCurrent metallic-based electrochemical actuators are limited to nanoporous gold/platinum with randomly distributed pores, where the charge-induced reversible strain is mainly due to the nonfaradic charging/discharging processes along the capacitive electrochemical double layer. Here, we report an electrochemical actuating property of nanohoneycomb-structured nickel, with the actuation mechanism mainly due to a pseudocapacitive behavior by means of reversible faradic redox reactions. By using a dual-template synthesis method, a bilayered cantilever, comprising a nanohoneycomb layer backed by a solid layer of the same metal, was fabricated. Reversible bending of the cantilever upon cyclic potential triggering was observed. The strain of the cantilever increases nonlinearly with both potential and charge due to redox reactions. The maximum strain that can be achieved under a certain scan rate complies with a linear relationship with the capacity. Benefiting from the stable Ni(II)/Ni(III) redox couples at the electrode surface, the reversible actuation is very stable in hydroxide solutions.
Persistent Identifierhttp://hdl.handle.net/10722/211786
ISSN
2015 Impact Factor: 13.334
2015 SCImago Journal Rankings: 7.120

 

DC FieldValueLanguage
dc.contributor.authorCheng, C-
dc.contributor.authorNgan, AHW-
dc.date.accessioned2015-07-21T02:10:40Z-
dc.date.available2015-07-21T02:10:40Z-
dc.date.issued2015-
dc.identifier.citationACS Nano, 2015, v. 9 n. 4, p. 3984-3995-
dc.identifier.issn1936-0851-
dc.identifier.urihttp://hdl.handle.net/10722/211786-
dc.description.abstractCurrent metallic-based electrochemical actuators are limited to nanoporous gold/platinum with randomly distributed pores, where the charge-induced reversible strain is mainly due to the nonfaradic charging/discharging processes along the capacitive electrochemical double layer. Here, we report an electrochemical actuating property of nanohoneycomb-structured nickel, with the actuation mechanism mainly due to a pseudocapacitive behavior by means of reversible faradic redox reactions. By using a dual-template synthesis method, a bilayered cantilever, comprising a nanohoneycomb layer backed by a solid layer of the same metal, was fabricated. Reversible bending of the cantilever upon cyclic potential triggering was observed. The strain of the cantilever increases nonlinearly with both potential and charge due to redox reactions. The maximum strain that can be achieved under a certain scan rate complies with a linear relationship with the capacity. Benefiting from the stable Ni(II)/Ni(III) redox couples at the electrode surface, the reversible actuation is very stable in hydroxide solutions.-
dc.languageeng-
dc.publisherAmerican Chemical Society. The Journal's web site is located at http://pubs.acs.org/journals/ancac3/index.html-
dc.relation.ispartofACS Nano-
dc.titleReversible electrochemical actuation of metallic nanohoneycombs induced by pseudocapacitive redox processes-
dc.typeArticle-
dc.identifier.emailCheng, C: chuan2@hku.hk-
dc.identifier.emailNgan, AHW: hwngan@hku.hk-
dc.identifier.authorityNgan, AHW=rp00225-
dc.identifier.doi10.1021/nn507466n-
dc.identifier.hkuros244361-
dc.identifier.volume9-
dc.identifier.issue4-
dc.identifier.spage3984-
dc.identifier.epage3995-
dc.publisher.placeUnited States-

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