Chemically softened boundary of metal/vacuum/solid-electrolyte from first principles

Tomofumi Tada, Satoshi Watanabe

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

We carried out electronic structure calculations on a Ni/vacuum/ZrO 2 triple phase boundary (TPB) and found that the TPB shows two distinct chemical/physical properties and responses depending on the contact structure between Ni and ZrO2 surfaces. To classify the properties of TPB in a systematic way, we propose a new concept of a chemically softened boundary. In the concept, the highly (poorly) softened boundary shows (i) extremely ordered (disordered) structure at the TPB, (ii) metallic (nonmetallic) density of states induced by Ni atoms at the TPB, and (iii) promotive (capacitive) response in charge redistributions by oxygen removal which mimics the discharge reaction in solid oxide fuel cell (SOFC). On the basis of the above results obtained using a relatively large TPB model which has both the highly and poorly softened boundaries, we propose smaller TPB models composed of a Ni-tip with a pyramidal shape and ZrO2 layers (atomic contact TPB models). S ingle-atom-contact and three-atom-contact: TPBs show chemical/physical properties and responses of poorly and highly softened boundaries, respectively.

Original languageEnglish
Pages (from-to)17780-17786
Number of pages7
JournalJournal of Physical Chemistry C
Volume113
Issue number41
DOIs
Publication statusPublished - Nov 20 2009
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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