Influence of Structural Defects on the Electrocatalytic Activity of Platinum Full article
| Journal |
Journal of Solid State Electrochemistry
ISSN: 1432-8488 , E-ISSN: 1433-0768 |
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| Output data | Year: 2008, Volume: 12, Number: 5, Pages: 497-509 Pages count : 13 DOI: 10.1007/s10008-007-0436-8 | ||||||
| Tags | CO oxidation, Electrocatalysis, Grain boundary, Methanol oxidation, Nanostructured materials, Platinum, Structural defects | ||||||
| Authors |
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| Affiliations |
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Funding (2)
| 1 | Russian Foundation for Basic Research | 06-03-32737 |
| 2 | Russian Foundation for Basic Research | 01-03-33132 |
Abstract:
Structural defects play major role in catalysis and electrocatalysis. Nanocrystalline (or nanostructured) materials
composed of nanometer-sized crystallites joined via grain boundaries have been recognized for their specific
structure and properties, differentiating them from single crystals, coarsely grained materials or nanometer-sized
supported single-grained particles (Gleiter, Nanostruct Mater 1:1–19, 1992). In this paper, we use Pt electrodes,
prepared by electrodeposition on glassy carbon and gold supports, as model nanocrystalline materials to explore the
influence of grain boundaries and other structural defects on electrocatalysis of CO and methanol oxidation. We build
on the recently established correlations between the nanostructure (lattice parameter, grain size, and microstrains) of
electrodeposited Pt and the deposition potential (Plyasova et al., Electrochim. Acta 51:4447–4488, 2006) and use the
latter to obtain materials with variable density of grain boundary regions. The activity of electrodeposited Pt in the
oxidation of methanol and adsorbed CO exceeds greatly that for Pt(111), polycrystalline Pt, or single-grained Pt
particles. It is proposed that active sites in nanostructured Pt are located at the emergence of grain boundaries at the
surface. For methanol electrooxidation, the electrodes with optimal nanostructure exhibit relatively high rates of the
“direct” oxidation pathway and of the oxidation of strongly adsorbed poisoning intermediate (COads), but not-too-high
methanol dehydrogenation rate constant. These electrodes exhibit an initial current increase during potentiostatic
methanol oxidation explained by the COads oxidation rate constant exceeding the methanol decomposition rate
constant.
Cite:
Cherstiouk O.V.
, Gavrilov A.N.
, Plyasova L.M.
, Molina I.Y.
, Tsirlina G.A.
, Savinova E.R.
Influence of Structural Defects on the Electrocatalytic Activity of Platinum
Journal of Solid State Electrochemistry. 2008. V.12. N5. P.497-509. DOI: 10.1007/s10008-007-0436-8 WOS Scopus РИНЦ ANCAN OpenAlex
Influence of Structural Defects on the Electrocatalytic Activity of Platinum
Journal of Solid State Electrochemistry. 2008. V.12. N5. P.497-509. DOI: 10.1007/s10008-007-0436-8 WOS Scopus РИНЦ ANCAN OpenAlex
Dates:
| Submitted: | Sep 19, 2006 |
| Accepted: | Aug 20, 2007 |
| Published online: | Oct 11, 2007 |
| Published print: | May 1, 2008 |
Identifiers:
| Web of science: | WOS:000253682900004 |
| Scopus: | 2-s2.0-40249094458 |
| Elibrary: | 13594219 |
| Chemical Abstracts: | 2008:265653 |
| Chemical Abstracts (print): | 150:178385 |
| OpenAlex: | W2152255034 |