Synthesis of nanoporous activated iridium oxide films by anodized aluminum oxide templated atomic layer deposition

David J. Comstock, Steven T. Christensen, Jeffrey W. Elam, Michael J. Pellin, Mark C. Hersam

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

Iridium oxide (IrOx) has been widely studied due to its applications in electrochromic devices, pH sensing, and neural stimulation. Previous work has demonstrated that both Ir and IrOx films with porous morphologies prepared by sputtering exhibit significantly enhanced charge storage capacities. However, sputtering provides only limited control over film porosity. In this work, we demonstrate an alternative scheme for synthesizing nanoporous Ir and activated IrOx films (AIROFs). This scheme utilizes atomic layer deposition to deposit a thin conformal Ir film within a nanoporous anodized aluminum oxide template. The Ir film is then activated by potential cycling in 0.1 M H2SO 4 to form a nanoporous AIROF. The morphologies and electrochemical properties of the films are characterized by scanning electron microscopy and cyclic voltammetry, respectively. The resulting nanoporous AIROFs exhibit a nanoporous morphology and enhanced cathodal charge storage capacities as large as 311 mC/cm2.

Original languageEnglish
Pages (from-to)1543-1546
Number of pages4
JournalElectrochemistry Communications
Volume12
Issue number11
DOIs
Publication statusPublished - Nov 1 2010

Keywords

  • Anodized aluminum oxide
  • Atomic layer deposition
  • Iridium
  • Iridium oxide
  • Nanoporous
  • Templated deposition

ASJC Scopus subject areas

  • Electrochemistry

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