title: Fabrication of Flexible, Redoxable, and Conductive Nanopillar Arrays with Enhanced Electrochemical Performance.
abstract: Highly ordered and flexible nanopillar arrays have received considerable interest for many applications of electrochemical devices because of their unique mechanical and structural properties. Here, we report on highly ordered polyoxometalate (POM)-doped polypyrrole (Ppy) nanopillar arrays produced by soft lithography and subsequent electrodeposition. As-prepared POM-Ppy/nanopillar films show superior electrochemical performances for pseudocapacitor and enzymeless electrochemical sensor applications and good mechanical properties, which allowed them to be easily bent and twisted. Regarding electrochemical characteristics for pseudocapacitive electrodes, the POM-Ppy/nanopillar electrodes are capable of delivering high areal capacitance of 77.0 mF cm(-2), high rate performance, and good cycle life of ∼100% retention over 3500 cycles even when bent. Moreover, the study suggests that the POM-Ppy/nanopillar electrodes have an excellent electrocatalytic activity toward hydrogen.
authors.affiliation: Department of Materials Science and Engineering and Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign , Urbana, Illinois 61801, United States.
authors.forename: MinHo
authors.initials: M
authors.lastname: Yang
authors.affiliation: Department of Chemical Engineering, Kangwon National University , Samcheok 25913, Republic of Korea.
authors.forename: Seok Bok
authors.initials: SB
authors.lastname: Hong
authors.affiliation: Department of Chemical Engineering, Kangwon National University , Samcheok 25913, Republic of Korea.
authors.forename: Jo Hee
authors.initials: JH
authors.lastname: Yoon
authors.affiliation: Department of Chemical Engineering, Kangwon National University , Samcheok 25913, Republic of Korea.
authors.forename: Dong Seok
authors.initials: DS
authors.lastname: Kim
authors.forename: Soon Woo
authors.initials: SW
authors.lastname: Jeong
authors.forename: Dong Eun
authors.initials: DE
authors.lastname: Yoo
authors.forename: Tae Jae
authors.initials: TJ
authors.lastname: Lee
authors.forename: Kyoung G
authors.initials: KG
authors.lastname: Lee
authors.forename: Seok Jae
authors.initials: SJ
authors.lastname: Lee
authors.affiliation: Department of Chemical Engineering, Kangwon National University , Samcheok 25913, Republic of Korea.
authors.forename: Bong Gill
authors.initials: BG
authors.lastname: Choi
keywords: biosensor; conducting polymer; nanopillar; polyoxometalate; supercapacitor