Surface characteristics of silver oxide thin film electrodes for supercapacitor applications

Mojtaba Mirzaeian, Abraham A. Ogwu, Hassan Fathinejad Jirandehi, Saule Aidarova, Zhanar Ospanova, Nathaniel Tsendzughul

Research output: Contribution to journalArticle

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Abstract

In this paper the preparation of nano-structured silver oxide thin films with different oxidation states with promise as electrode materials for supercapacitors by reactive magnetron sputtering is investigated. The chemical, structural, surface morphological dependence of the films on oxygen gas flow rate and deposition power were examined by scanning electron microscope (SEM), X-ray diffraction (XRD) and energy dispersive X-ray (EDX). The average thickness of the films was controlled in the range of ≈50–330 nm. The XRD spectra of the films indicated the formation of bi-phase films comprised of silver and silver oxides with different oxidation states. The wettability of the films in contact with different probing liquids was investigated by measuring the contact angles using a goniometer. It was shown that the silver oxide films are relatively hydrophilic and increasing oxygen flow rate increases the wettability of the films toward water as a result of an increase in the oxidation state of the films and consequently clustering of electrons in polar molecules of water around the oxides at higher oxidation states. This is further confirmed by the analysis of the surface energy measurements.
Original languageEnglish
Pages (from-to)223-230
Number of pages8
JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
Volume519
Early online date14 Apr 2016
DOIs
Publication statusPublished - 20 Apr 2017

Keywords

  • Thin film electrode
  • Silver oxide
  • Oxidation state
  • Wettability
  • Surface energy
  • Reactive magnetron sputtering

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