Oxidation of formic acid on bulk and nanosized Pt-Co alloys
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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 / OxidationSource:
Second Regional Symposium on Electrochemistry South-East Europe, RSE-SEE, Proceedings, 2010, 112-115Publisher:
- Serbian Chemical Society, Belgrade
Note:
- Belgrade, Serbia, June 6-10, 2010
- Related to the http://cer.ihtm.bg.ac.rs/handle/123456789/3536
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IHTMTY - CONF AU - Obradović, Maja AU - Tripković, Amalija AU - Gojković, Snežana Lj. PY - 2010 UR - http://www.aseee.eu/index.php/rsesee2-home UR - https://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 UR - https://hdl.handle.net/21.15107/rcub_cer_3537 ER -
@conference{ author = "Obradović, Maja and Tripković, Amalija and Gojković, Snežana Lj.", year = "2010", 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", url = "https://hdl.handle.net/21.15107/rcub_cer_3537" }
Obradović, M., Tripković, A.,& Gojković, S. Lj.. (2010). Oxidation of formic acid on bulk and nanosized Pt-Co alloys. in Second Regional Symposium on Electrochemistry South-East Europe, RSE-SEE, Proceedings Serbian Chemical Society, Belgrade., 112-115. https://hdl.handle.net/21.15107/rcub_cer_3537
Obradović M, Tripković A, Gojković SL. Oxidation of formic acid on bulk and nanosized Pt-Co alloys. in Second Regional Symposium on Electrochemistry South-East Europe, RSE-SEE, Proceedings. 2010;:112-115. https://hdl.handle.net/21.15107/rcub_cer_3537 .
Obradović, Maja, Tripković, Amalija, Gojković, Snežana Lj., "Oxidation of formic acid on bulk and nanosized Pt-Co alloys" in Second Regional Symposium on Electrochemistry South-East Europe, RSE-SEE, Proceedings (2010):112-115, https://hdl.handle.net/21.15107/rcub_cer_3537 .