The activity of two alloys, Pt3Sn/C and Pt3Ru2/C, was compared with the activity of Pt/C modified with corresponding amounts of SnUPD (≈25%) and RuUPD (≈40%) in the oxidation of ethanol. Pt3Sn/C, Pt3Ru2/C and Pt/C catalysts were characterized by XRD analysis. To establish the activity and stability of the catalysts, potentiodynamic, quasi steady-state and chronoamperometric measurements were performed. Both alloys are more active than SnUPD-or RuUPD-modified Pt/C catalysts. The electronic effect determining dominantly the activity of Pt3Sn/C is the main reason for its higher activity compared to Pt3Ru2/C. Since SnUPD and RuUPD do not provoke any significant modification of electronic environment, both modified Pt/C catalysts were less active than the corresponding alloys. More pronounced difference in activity between Pt3Sn/C and SnUPD-modified Pt/C than between Pt3Ru2/C and RuUPD-modified Pt/C is caused by the electronic effect in Pt3Sn/C. The high activity of Pt3Sn/C modified with a ...small amount of SnUPD (≈10%) can be explained by combining the electronic effect, causing less strongly bonded adsorbate on Pt sites and easier mobility of the SnUPD, with an enhanced amount of oxygen- containing species on the Sn sites, resulting finally in a reinforcement of the bifunctional mechanism.
Aktivnost dve legure, Pt3Sn/C i Pt3Ru2/C, upoređene su sa aktivnostima Pt/C modifikovanim odgovarajućim količinama SnUPD (≈ 25%) ili RuUPD (≈ 40%) u reakciji oksidacije etanola. Katalizatori su okarakterisani difrakcijom X-zraka (XRD) i određen je stepen legiranja. Njihova aktivnost i stabilnost ispitivana je potenciodinamičkim, kvazi-stacionarnim i hronoamperometrijskim merenjima. Dobijeni rezultati su pokazali da su obe legure aktivnije od SnUPD i RuUPD modifikovanog Pt/C katalizatora. Aktivnost Pt3Sn/C katalizatora određena je značajnim elektronskim efektom, što je i glavni razlog njegove veće aktivnosti u odnosu na Pt3Ru2/C. Odsustvo elektronskog efekta kod SnUPD i RuUPD modifikovanog Pt/C katalizatora čini ove elektrode manje aktivnim od odgovarajućih legura, tj. od Pt3Sn/C i Pt3Ru2/C. Veća razlika u aktivnosti između Pt3Sn/C i SnUPD modifikovanog Pt/C katalizatora nego između Pt3Ru2/C i RuUPD modifikovanog Pt/C katalizatora izazvana je elektronskim efektom u Pt3Sn/C katalizatoru.... Velika aktivnost Pt3Sn/C katalizatora modifikovanog malom količinom SnUPD (≈ 10 %) može se objasniti kombinacijom elektronskog efekta, tj. slabijom vezom adsorbata na Pt mestima i većom mobilnošću SnUPD, i povećanom količinom OHad čestica na Sn mestima, što kao krajnji rezultat ima poboljšanje bifunkcionalnog mehanizma reakcije.
TY - JOUR
AU - Tripković, Amalija
AU - Lović, Jelena
AU - Popović, Ksenija
PY - 2010
UR - https://cer.ihtm.bg.ac.rs/handle/123456789/685
AB - The activity of two alloys, Pt3Sn/C and Pt3Ru2/C, was compared with the activity of Pt/C modified with corresponding amounts of SnUPD (≈25%) and RuUPD (≈40%) in the oxidation of ethanol. Pt3Sn/C, Pt3Ru2/C and Pt/C catalysts were characterized by XRD analysis. To establish the activity and stability of the catalysts, potentiodynamic, quasi steady-state and chronoamperometric measurements were performed. Both alloys are more active than SnUPD-or RuUPD-modified Pt/C catalysts. The electronic effect determining dominantly the activity of Pt3Sn/C is the main reason for its higher activity compared to Pt3Ru2/C. Since SnUPD and RuUPD do not provoke any significant modification of electronic environment, both modified Pt/C catalysts were less active than the corresponding alloys. More pronounced difference in activity between Pt3Sn/C and SnUPD-modified Pt/C than between Pt3Ru2/C and RuUPD-modified Pt/C is caused by the electronic effect in Pt3Sn/C. The high activity of Pt3Sn/C modified with a small amount of SnUPD (≈10%) can be explained by combining the electronic effect, causing less strongly bonded adsorbate on Pt sites and easier mobility of the SnUPD, with an enhanced amount of oxygen- containing species on the Sn sites, resulting finally in a reinforcement of the bifunctional mechanism.
AB - Aktivnost dve legure, Pt3Sn/C i Pt3Ru2/C, upoređene su sa aktivnostima Pt/C modifikovanim odgovarajućim količinama SnUPD (≈ 25%) ili RuUPD (≈ 40%) u reakciji oksidacije etanola. Katalizatori su okarakterisani difrakcijom X-zraka (XRD) i određen je stepen legiranja. Njihova aktivnost i stabilnost ispitivana je potenciodinamičkim, kvazi-stacionarnim i hronoamperometrijskim merenjima. Dobijeni rezultati su pokazali da su obe legure aktivnije od SnUPD i RuUPD modifikovanog Pt/C katalizatora. Aktivnost Pt3Sn/C katalizatora određena je značajnim elektronskim efektom, što je i glavni razlog njegove veće aktivnosti u odnosu na Pt3Ru2/C. Odsustvo elektronskog efekta kod SnUPD i RuUPD modifikovanog Pt/C katalizatora čini ove elektrode manje aktivnim od odgovarajućih legura, tj. od Pt3Sn/C i Pt3Ru2/C. Veća razlika u aktivnosti između Pt3Sn/C i SnUPD modifikovanog Pt/C katalizatora nego između Pt3Ru2/C i RuUPD modifikovanog Pt/C katalizatora izazvana je elektronskim efektom u Pt3Sn/C katalizatoru. Velika aktivnost Pt3Sn/C katalizatora modifikovanog malom količinom SnUPD (≈ 10 %) može se objasniti kombinacijom elektronskog efekta, tj. slabijom vezom adsorbata na Pt mestima i većom mobilnošću SnUPD, i povećanom količinom OHad čestica na Sn mestima, što kao krajnji rezultat ima poboljšanje bifunkcionalnog mehanizma reakcije.
PB - Serbian Chemical Society
T2 - Journal of the Serbian Chemical Society
T1 - Comparative study of ethanol oxidation at Pt-based nanoalloys and UPD-modified pt nanoparticles
T1 - Uporedno ispitivanje oksidacije etanola na platinskim nanolegurama i Pt nanočesticama modifikovanim podpotencijalnom depozicijom
VL - 75
IS - 11
SP - 1559
EP - 1574
DO - 10.2298/JSC100519093T
ER -
@article{
author = "Tripković, Amalija and Lović, Jelena and Popović, Ksenija",
year = "2010",
abstract = "The activity of two alloys, Pt3Sn/C and Pt3Ru2/C, was compared with the activity of Pt/C modified with corresponding amounts of SnUPD (≈25%) and RuUPD (≈40%) in the oxidation of ethanol. Pt3Sn/C, Pt3Ru2/C and Pt/C catalysts were characterized by XRD analysis. To establish the activity and stability of the catalysts, potentiodynamic, quasi steady-state and chronoamperometric measurements were performed. Both alloys are more active than SnUPD-or RuUPD-modified Pt/C catalysts. The electronic effect determining dominantly the activity of Pt3Sn/C is the main reason for its higher activity compared to Pt3Ru2/C. Since SnUPD and RuUPD do not provoke any significant modification of electronic environment, both modified Pt/C catalysts were less active than the corresponding alloys. More pronounced difference in activity between Pt3Sn/C and SnUPD-modified Pt/C than between Pt3Ru2/C and RuUPD-modified Pt/C is caused by the electronic effect in Pt3Sn/C. The high activity of Pt3Sn/C modified with a small amount of SnUPD (≈10%) can be explained by combining the electronic effect, causing less strongly bonded adsorbate on Pt sites and easier mobility of the SnUPD, with an enhanced amount of oxygen- containing species on the Sn sites, resulting finally in a reinforcement of the bifunctional mechanism., Aktivnost dve legure, Pt3Sn/C i Pt3Ru2/C, upoređene su sa aktivnostima Pt/C modifikovanim odgovarajućim količinama SnUPD (≈ 25%) ili RuUPD (≈ 40%) u reakciji oksidacije etanola. Katalizatori su okarakterisani difrakcijom X-zraka (XRD) i određen je stepen legiranja. Njihova aktivnost i stabilnost ispitivana je potenciodinamičkim, kvazi-stacionarnim i hronoamperometrijskim merenjima. Dobijeni rezultati su pokazali da su obe legure aktivnije od SnUPD i RuUPD modifikovanog Pt/C katalizatora. Aktivnost Pt3Sn/C katalizatora određena je značajnim elektronskim efektom, što je i glavni razlog njegove veće aktivnosti u odnosu na Pt3Ru2/C. Odsustvo elektronskog efekta kod SnUPD i RuUPD modifikovanog Pt/C katalizatora čini ove elektrode manje aktivnim od odgovarajućih legura, tj. od Pt3Sn/C i Pt3Ru2/C. Veća razlika u aktivnosti između Pt3Sn/C i SnUPD modifikovanog Pt/C katalizatora nego između Pt3Ru2/C i RuUPD modifikovanog Pt/C katalizatora izazvana je elektronskim efektom u Pt3Sn/C katalizatoru. Velika aktivnost Pt3Sn/C katalizatora modifikovanog malom količinom SnUPD (≈ 10 %) može se objasniti kombinacijom elektronskog efekta, tj. slabijom vezom adsorbata na Pt mestima i većom mobilnošću SnUPD, i povećanom količinom OHad čestica na Sn mestima, što kao krajnji rezultat ima poboljšanje bifunkcionalnog mehanizma reakcije.",
publisher = "Serbian Chemical Society",
journal = "Journal of the Serbian Chemical Society",
title = "Comparative study of ethanol oxidation at Pt-based nanoalloys and UPD-modified pt nanoparticles, Uporedno ispitivanje oksidacije etanola na platinskim nanolegurama i Pt nanočesticama modifikovanim podpotencijalnom depozicijom",
volume = "75",
number = "11",
pages = "1559-1574",
doi = "10.2298/JSC100519093T"
}
Tripković, A., Lović, J.,& Popović, K.. (2010). Comparative study of ethanol oxidation at Pt-based nanoalloys and UPD-modified pt nanoparticles. in Journal of the Serbian Chemical Society
Serbian Chemical Society., 75(11), 1559-1574.
https://doi.org/10.2298/JSC100519093T
Tripković A, Lović J, Popović K. Comparative study of ethanol oxidation at Pt-based nanoalloys and UPD-modified pt nanoparticles. in Journal of the Serbian Chemical Society. 2010;75(11):1559-1574.
doi:10.2298/JSC100519093T .
Tripković, Amalija, Lović, Jelena, Popović, Ksenija, "Comparative study of ethanol oxidation at Pt-based nanoalloys and UPD-modified pt nanoparticles" in Journal of the Serbian Chemical Society, 75, no. 11 (2010):1559-1574,
https://doi.org/10.2298/JSC100519093T . .
