Bulk Pt3Co and nanosized Pt3Co and PtCo alloys supported on XC-72 high area carbon were investigated as the electrocatalysts for the oxidation of formic acid. Cyclic voltammetry in 0.1 M HClO4 and stripping voltammetry of COads in the same electrolyte show a small difference in the potentials of Pt-oxide formation and reduction and COads oxidation. Based on these results, we concluded that electronic modification of Pt by Co atoms, which was theoretically predicted and experimentally proved on solid/gas interface, is exhibited in the electrochemical environment. Promotion of HCOOH oxidation rate on bimetallic Pt-Co surfaces with respect to pure Pt was found to be up to factor of eight in the case of PtCo/XC-72 catalyst. This moderate increase of the reaction rate is ascribed mostly to the ensemble effect, because partial leaching of Co increased Pt:Co ratio at the bimetallic surfaces, diminishing the efficiency of the ensemble effect.
Keywords:
Cyclic voltammetry / Formic acid / Oxidation
Source:
Second Regional Symposium on Electrochemistry South-East Europe, RSE-SEE, Proceedings, 2010, 112-115
TY - CONF
AU - Obradović, Maja
AU - Tripković, Amalija
AU - Gojković, Snežana Lj.
PY - 2010
UR - http://www.aseee.eu/index.php/rsesee2-home
UR - http://cer.ihtm.bg.ac.rs/handle/123456789/3537
AB - Bulk Pt3Co and nanosized Pt3Co and PtCo alloys supported on XC-72 high area carbon were investigated as the electrocatalysts for the oxidation of formic acid. Cyclic voltammetry in 0.1 M HClO4 and stripping voltammetry of COads in the same electrolyte show a small difference in the potentials of Pt-oxide formation and reduction and COads oxidation. Based on these results, we concluded that electronic modification of Pt by Co atoms, which was theoretically predicted and experimentally proved on solid/gas interface, is exhibited in the electrochemical environment. Promotion of HCOOH oxidation rate on bimetallic Pt-Co surfaces with respect to pure Pt was found to be up to factor of eight in the case of PtCo/XC-72 catalyst. This moderate increase of the reaction rate is ascribed mostly to the ensemble effect, because partial leaching of Co increased Pt:Co ratio at the bimetallic surfaces, diminishing the efficiency of the ensemble effect.
PB - Serbian Chemical Society, Belgrade
C3 - Second Regional Symposium on Electrochemistry South-East Europe, RSE-SEE, Proceedings
T1 - Oxidation of formic acid on bulk and nanosized Pt-Co alloys
SP - 112
EP - 115
ER -
@conference{
author = "Obradović, Maja and Tripković, Amalija and Gojković, Snežana Lj.",
year = "2010",
url = "http://www.aseee.eu/index.php/rsesee2-home, http://cer.ihtm.bg.ac.rs/handle/123456789/3537",
abstract = "Bulk Pt3Co and nanosized Pt3Co and PtCo alloys supported on XC-72 high area carbon were investigated as the electrocatalysts for the oxidation of formic acid. Cyclic voltammetry in 0.1 M HClO4 and stripping voltammetry of COads in the same electrolyte show a small difference in the potentials of Pt-oxide formation and reduction and COads oxidation. Based on these results, we concluded that electronic modification of Pt by Co atoms, which was theoretically predicted and experimentally proved on solid/gas interface, is exhibited in the electrochemical environment. Promotion of HCOOH oxidation rate on bimetallic Pt-Co surfaces with respect to pure Pt was found to be up to factor of eight in the case of PtCo/XC-72 catalyst. This moderate increase of the reaction rate is ascribed mostly to the ensemble effect, because partial leaching of Co increased Pt:Co ratio at the bimetallic surfaces, diminishing the efficiency of the ensemble effect.",
publisher = "Serbian Chemical Society, Belgrade",
journal = "Second Regional Symposium on Electrochemistry South-East Europe, RSE-SEE, Proceedings",
title = "Oxidation of formic acid on bulk and nanosized Pt-Co alloys",
pages = "112-115"
}
Obradović, M., Tripković, A.,& Gojković, S. Lj. (2010). Oxidation of formic acid on bulk and nanosized Pt-Co alloys.
Second Regional Symposium on Electrochemistry South-East Europe, RSE-SEE, Proceedings
Serbian Chemical Society, Belgrade., 112-115.
Obradović M, Tripković A, Gojković SL. Oxidation of formic acid on bulk and nanosized Pt-Co alloys. Second Regional Symposium on Electrochemistry South-East Europe, RSE-SEE, Proceedings. 2010;:112-115
Obradović Maja, Tripković Amalija, Gojković Snežana Lj., "Oxidation of formic acid on bulk and nanosized Pt-Co alloys" Second Regional Symposium on Electrochemistry South-East Europe, RSE-SEE, Proceedings (2010):112-115
