Pt-Sn-Co nanocubes as highly active catalysts for ethanol electro-oxidation
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Pt-Sn-Co nanocubes as highly active catalysts for ethanol electro-oxidation. / Rizo, Rubén; Bergmann, Arno; Timoshenko, Janis; Scholten, Fabian; Rettenmaier, Clara; Jeon, Hyo Sang; Chen, Yen-ting; Yoon, Aram; Bagger, Alexander; Rossmeisl, Jan; Roldan Cuenya, Beatriz.
I: Journal of Catalysis, Bind 393, 01.01.2021, s. 247-258.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - Pt-Sn-Co nanocubes as highly active catalysts for ethanol electro-oxidation
AU - Rizo, Rubén
AU - Bergmann, Arno
AU - Timoshenko, Janis
AU - Scholten, Fabian
AU - Rettenmaier, Clara
AU - Jeon, Hyo Sang
AU - Chen, Yen-ting
AU - Yoon, Aram
AU - Bagger, Alexander
AU - Rossmeisl, Jan
AU - Roldan Cuenya, Beatriz
PY - 2021/1/1
Y1 - 2021/1/1
N2 - Direct ethanol fuel cells are among the most promising clean electrochemical power sources. Nevertheless, the high cost and low efficiency of the Pt-based catalysts hinder their commercialization. Here, Pt-Sn-Co nanocubes with a Pt- and Sn-rich shell show improved performance towards the electrochemical ethanol oxidation reaction (EOR). Mechanistic and structural insights were obtained by synergistically combining different in situ and operando spectro-electrochemical techniques, including electrochemical mass spectrometry, X-ray photoelectron spectroscopy and X-ray absorption spectroscopy. In particular, electrochemical conditioning and EOR were found to induce Sn leaching from the core and shell, leading to electrochemically-accessible Pt sites adjacent to partially-oxidized Sn sites on a Pt3Co-like core. The increased activity of the Pt-Sn-Co nanocubes was assigned to the formation of a higher amount of C1 (CO2) and C2 (acetic acid/acetaldehyde) products during EOR as well as to their high ability to remove adsorbed CO from the Pt surface when compared to similarly-sized cubic Pt-Sn or Pt NPs. Beneficial strain and ligand effects are combined here through a catalyst design resulting in adjacent Pt and Sn sites at the overlayer on top of a Pt3Co alloy core.
AB - Direct ethanol fuel cells are among the most promising clean electrochemical power sources. Nevertheless, the high cost and low efficiency of the Pt-based catalysts hinder their commercialization. Here, Pt-Sn-Co nanocubes with a Pt- and Sn-rich shell show improved performance towards the electrochemical ethanol oxidation reaction (EOR). Mechanistic and structural insights were obtained by synergistically combining different in situ and operando spectro-electrochemical techniques, including electrochemical mass spectrometry, X-ray photoelectron spectroscopy and X-ray absorption spectroscopy. In particular, electrochemical conditioning and EOR were found to induce Sn leaching from the core and shell, leading to electrochemically-accessible Pt sites adjacent to partially-oxidized Sn sites on a Pt3Co-like core. The increased activity of the Pt-Sn-Co nanocubes was assigned to the formation of a higher amount of C1 (CO2) and C2 (acetic acid/acetaldehyde) products during EOR as well as to their high ability to remove adsorbed CO from the Pt surface when compared to similarly-sized cubic Pt-Sn or Pt NPs. Beneficial strain and ligand effects are combined here through a catalyst design resulting in adjacent Pt and Sn sites at the overlayer on top of a Pt3Co alloy core.
U2 - 10.1016/j.jcat.2020.11.017
DO - 10.1016/j.jcat.2020.11.017
M3 - Journal article
VL - 393
SP - 247
EP - 258
JO - Journal of Catalysis
JF - Journal of Catalysis
SN - 0021-9517
ER -
ID: 261371134