Structure-independent proton transport in cerium(III) phosphate nanowires

Péter Pusztai, Henrik Haspel, Ildikó Y. Tóth, Etelka Tombácz, Krisztina László, Ákos Kukovecz, Zoltán Kónya

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Understanding of water-related electrical conduction is of utmost importance in applications that utilize solid-state proton conductors. However, in spite of the vast amount of theoretical and experimental work published in the literature, thus far its mechanism remained unsolved. In this study, the structure-related ambient temperature electrical conduction of one-dimensional hydrophilic nanostructures was investigated. Cerium phosphate nanowires with monoclinic and hexagonal crystal structures were synthesized via the hydrothermal and ambient temperature precipitation routes, and their structural and surface properties were examined by using high-resolution transmission electron microscopy, X-ray diffractometry, nitrogen and water sorption, temperature-programmed ammonia desorption, and potentiometric titration techniques. The relative humidity (RH)-dependent charge-transport processes of hexagonal and monoclinic nanowires were investigated by means of impedance spectroscopy and transient ionic current measurement techniques to gain insight into their atomistic level mechanism. Although considerable differences in RH-dependent conductivity were first found, the distinct characteristics collapsed into a master curve when specific surface area and acidity were taken into account, implying structure-independent proton conduction mechanism in both types of nanowires.

Original languageEnglish
Pages (from-to)9947-9956
Number of pages10
JournalACS Applied Materials and Interfaces
Volume7
Issue number18
DOIs
Publication statusPublished - May 13 2015

Keywords

  • cerium phosphate
  • fuel cell membrane
  • impedance spectroscopy
  • master curve
  • proton conduction
  • surface acidity

ASJC Scopus subject areas

  • Materials Science(all)

Fingerprint Dive into the research topics of 'Structure-independent proton transport in cerium(III) phosphate nanowires'. Together they form a unique fingerprint.

  • Cite this