Electrochemical stability of nanometer-scale Pt particles in acidic environments

Lei Tang, Byungchan Han, Kristin Persson, Cody Friesen, Ting He, Karl Sieradzki, Gerbrand Ceder

Research output: Contribution to journalArticle

212 Citations (Scopus)

Abstract

Understanding and controlling the electrochemical stability or corrosion behavior of nanometer-scale solids is vitally important in a variety of applications such as nanoscale electronics, sensing, and catalysis. For many applications, the increased surface to volume ratio achieved by particle size reduction leads to lower materials cost and higher efficiency, but there are questions as to whether the intrinsic stability of materials also decreases with particle size. An important example of this relates to the stability of Pt catalysts in, for example, proton exchange fuel cells. In this Article, we use electrochemical scanning tunneling microscopy to, for the first time, directly examine the stability of individual Pt nanoparticles as a function of applied potential. We combine this experimental study with ab initio computations to determine the stability, passivation, and dissolution behavior of Pt as a function of particle size and potential. Both approaches clearly show that smaller Pt particles dissolve well below the bulk dissolution potential and through a different mechanism. Pt dissolution from a nanoparticle occurs by direct electro-oxidation of Pt to soluble Pt2+ cations, unlike bulk Pt, which dissolves from the oxide. These results have important implications for understanding the stability of Pt and Pt alloy catalysts in fuel cell architectures, and for the stability of nanoparticles in general.

Original languageEnglish
Pages (from-to)596-600
Number of pages5
JournalJournal of the American Chemical Society
Volume132
Issue number2
DOIs
Publication statusPublished - 2010 Jan 20

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Particle Size
Nanoparticles
Electrochemical Scanning Microscopy
Scanning Tunnelling Microscopy
Corrosion
Dissolution
Catalysis
Particle size
Oxides
Cations
Protons
Fuel cells
Costs and Cost Analysis
Catalysts
Electrooxidation
Scanning tunneling microscopy
Passivation
Ion exchange
Electronic equipment
Positive ions

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

Cite this

Tang, Lei ; Han, Byungchan ; Persson, Kristin ; Friesen, Cody ; He, Ting ; Sieradzki, Karl ; Ceder, Gerbrand. / Electrochemical stability of nanometer-scale Pt particles in acidic environments. In: Journal of the American Chemical Society. 2010 ; Vol. 132, No. 2. pp. 596-600.
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Electrochemical stability of nanometer-scale Pt particles in acidic environments. / Tang, Lei; Han, Byungchan; Persson, Kristin; Friesen, Cody; He, Ting; Sieradzki, Karl; Ceder, Gerbrand.

In: Journal of the American Chemical Society, Vol. 132, No. 2, 20.01.2010, p. 596-600.

Research output: Contribution to journalArticle

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