In situ structural characterization of platinum dendrimer-encapsulated oxygen reduction electrocatalysts

V. Sue Myers; Anatoly I. Frenkel; Richard M. Crooks

doi:10.1021/la203756z

In situ structural characterization of platinum dendrimer-encapsulated oxygen reduction electrocatalysts

V. Sue Myers
, Anatoly I. Frenkel
, Richard M. Crooks

Materials Science and Engineering

University of Texas at Austin

Research output: Contribution to journal › Article › peer-review

17 Scopus citations

Abstract

In situ electrochemical extended X-ray absorption fine structure (EXAFS) was used to evaluate the structure of Pt dendrimer-encapsulated nanoparticles (DENs) during the oxygen reduction reaction (ORR). The DENs contained an average of just 225 atoms each. The results indicate that the Pt coordination number (CN) decreases when the electrode potential is moved to positive values. The results are interpreted in terms of an ordered core, disordered shell model. The structure of the DENs is not significantly impacted by the presence of dioxygen, but other electrogenerated species may have a significant impact on nanoparticle structure.

Original language	English
Pages (from-to)	1596-1603
Number of pages	8
Journal	Langmuir
Volume	28
Issue number	2
DOIs	https://doi.org/10.1021/la203756z
State	Published - Jan 17 2012

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title = "In situ structural characterization of platinum dendrimer-encapsulated oxygen reduction electrocatalysts",

abstract = "In situ electrochemical extended X-ray absorption fine structure (EXAFS) was used to evaluate the structure of Pt dendrimer-encapsulated nanoparticles (DENs) during the oxygen reduction reaction (ORR). The DENs contained an average of just 225 atoms each. The results indicate that the Pt coordination number (CN) decreases when the electrode potential is moved to positive values. The results are interpreted in terms of an ordered core, disordered shell model. The structure of the DENs is not significantly impacted by the presence of dioxygen, but other electrogenerated species may have a significant impact on nanoparticle structure.",

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T1 - In situ structural characterization of platinum dendrimer-encapsulated oxygen reduction electrocatalysts

AU - Myers, V. Sue

AU - Frenkel, Anatoly I.

AU - Crooks, Richard M.

PY - 2012/1/17

Y1 - 2012/1/17

N2 - In situ electrochemical extended X-ray absorption fine structure (EXAFS) was used to evaluate the structure of Pt dendrimer-encapsulated nanoparticles (DENs) during the oxygen reduction reaction (ORR). The DENs contained an average of just 225 atoms each. The results indicate that the Pt coordination number (CN) decreases when the electrode potential is moved to positive values. The results are interpreted in terms of an ordered core, disordered shell model. The structure of the DENs is not significantly impacted by the presence of dioxygen, but other electrogenerated species may have a significant impact on nanoparticle structure.

AB - In situ electrochemical extended X-ray absorption fine structure (EXAFS) was used to evaluate the structure of Pt dendrimer-encapsulated nanoparticles (DENs) during the oxygen reduction reaction (ORR). The DENs contained an average of just 225 atoms each. The results indicate that the Pt coordination number (CN) decreases when the electrode potential is moved to positive values. The results are interpreted in terms of an ordered core, disordered shell model. The structure of the DENs is not significantly impacted by the presence of dioxygen, but other electrogenerated species may have a significant impact on nanoparticle structure.

UR - https://www.scopus.com/pages/publications/84855961745

U2 - 10.1021/la203756z

DO - 10.1021/la203756z

M3 - Article

AN - SCOPUS:84855961745

SN - 0743-7463

VL - 28

SP - 1596

EP - 1603

JO - Langmuir

JF - Langmuir

IS - 2

ER -

In situ structural characterization of platinum dendrimer-encapsulated oxygen reduction electrocatalysts

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