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Enhancement of Proton Transport in an Oriented Polypeptide Thin Film

Nagao, Yuki and Matsui, Jun and Abe, Takashi and Hiramatsu, Hirotsugu and Yamamoto, Hitoshi and Miyashita, Tokuji and Sata, Noriko and Yugami, Hiroo (2013) Enhancement of Proton Transport in an Oriented Polypeptide Thin Film. Langmuir, 29, pp. 6798-6804. ACS Publications. DOI: 10.1021/la400412f. ISSN 0743-7463.

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Abstract

Proton transport properties of a partially protonated poly(aspartic acid)/sodium polyaspartate (P-Asp) were investigated. A remarkable enhancement of proton conductivity has been achieved in the thin film. Proton conductivity of 60-nm-thick thin film prepared on MgO(100) substrate was 3.4 × 10−3 S cm−1 at 298 K. The electrical conductivity of the oriented thin film was 1 order of magnitude higher than the bulk specimen, and the activation energies for the proton conductivity were 0.34 eV for the oriented thin film and 0.65 eV for the pelletized sample, respectively. This enhancement of the proton transport is attributable to the highly oriented structure on MgO(100) substrate. This result proposes great potential for a new strategy to produce a highly proton-conductive material using the concept of an oriented thin film structure without strong acid groups.

Document Type:Article
Title:Enhancement of Proton Transport in an Oriented Polypeptide Thin Film
Authors:
AuthorsInstitution or Email of Authors
Nagao, YukiSchool of Materials Science, Japan Advanced Institute of Science and Technology
Matsui, JunInstitute of Multidisciplinary Research for Advanced Materials (IMRAM), Tohoku University
Abe, TakashiGraduate School of Science and Technology, Niigata University
Hiramatsu, HirotsuguGraduate School of Pharmaceutical Sciences, Tohoku University
Yamamoto, HitoshiDepartment of Safety and Hygiene, Osaka University
Miyashita, TokujiInstitute of Multidisciplinary Research for Advanced Materials (IMRAM), Tohoku University
Sata, NorikoInstitute of Technical Thermodynamics, German Aerospace Center (DLR)
Yugami, HirooGraduate School of Engineering, Tohoku University
Date:30 May 2013
Journal or Publication Title:Langmuir
Refereed publication:Yes
In Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:29
DOI:10.1021/la400412f
Page Range:pp. 6798-6804
Publisher:ACS Publications
ISSN:0743-7463
Status:Published
Keywords:proton transport, polypeptide thin film, PEFC, infrared reflection absorption spectroscopy
HGF - Research field:Energy
HGF - Program:Efficient Energy Conversion and Use
HGF - Program Themes:Fuel Cells
DLR - Research area:Energy
DLR - Program:E EV - Energy process technology
DLR - Research theme (Project):E - Elektrochemische Prozesse
Location: Stuttgart
Institutes and Institutions:Institute of Technical Thermodynamics > Electrochemical Energy Technology
Deposited By: Dr. Noriko Metzger-Sata
Deposited On:30 Oct 2013 12:17
Last Modified:12 Dec 2013 22:14

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