Nanofaceted C/Re(1121): fabrication, structure, and template for synthesizing nanostructured model Pt electrocatalyst for hydrogen evolution reaction.
ACS Nano
; 6(2): 1404-9, 2012 Feb 28.
Article
em En
| MEDLINE
| ID: mdl-22264090
ABSTRACT
We report the first observation of carbon-induced nanofaceting of a Re single crystal and its application in synthesizing a nanostructured model Pt electrocatalyst investigated using multiple surface science techniques, including low-energy electron diffraction, Auger electron spectroscopy, X-ray photoelectron spectroscopy, low-energy ion scattering, and scanning tunneling microscopy, combined with electrochemical reaction measurements. Upon annealing in acetylene at 700 K followed by annealing in vacuum at 1100 K, an initially planar Re(112Ì
1) surface becomes completely faceted and covered with three-sided nanopyramids exposing (011Ì
1), (101Ì
1), and (112Ì
0) faces. Using the faceted C/Re(112Ì
1) surface as a template, we have successfully fabricated a nanostructured Pt monolayer (ML) electrocatalyst. The Pt ML supported on the C/Re nanotemplate exhibits higher activity for the hydrogen evolution reaction than Pt(111). This is the first application of faceted metal surfaces as templates for synthesis of nanoscale model electrocatalyst with well-defined (facet) surface structure and controlled (facet) size on the nanometer scale, illustrating the potential for future studies of nanostructured bimetallic systems relevant to electrocatalytic reactions.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Platina
/
Rênio
/
Carbono
/
Nanotecnologia
/
Nanoestruturas
/
Hidrogênio
Idioma:
En
Revista:
ACS Nano
Ano de publicação:
2012
Tipo de documento:
Article
País de afiliação:
Estados Unidos