Palladium-copper bimetallic surfaces as electrocatalysts for the ethanol oxidation in an alkaline medium
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2023
Authors
Obradović, MajaLačnjevac, Uroš
Radmilovic, Vuk
Gavrilović-Wohlmuther, Aleksandra
Kovač, Janez
Rogan, Jelena R.
Radmilović, Velimir R.
Gojković, Snežana Lj.
Article (Published version)
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Show full item recordAbstract
Two types of Cu-modified Pd catalysts supported on high area carbon were prepared: Pd nanoparticles modified
with a sub-monolayer of underpotentially deposited Cu (Cu@Pd/C) and Pd-Cu alloy nanoparticles (Pd-Cu/C),
and examined for the ethanol oxidation reaction (EOR) in alkaline solution. The catalysts were characterized by
energy-dispersive X-ray spectroscopy, X-ray diffraction, transmission electron microscopy and X-ray photoelectron
spectroscopy, as well as cyclic voltammetry. As reference catalysts, Pd/C and Pt/C were used. The electrochemically
active surface area of all samples was determined from COads and Cuupd desorption and Pd oxide
reduction, and used to assess their intrinsic activity for EOR. Intimate contact of Pd with Cu atoms enhanced its
activity, regardless of the type of bimetal catalyst. The atomic Pd:Cu ratio between 2:1 and 4:1 appears to be
optimal for high activity. The most active catalyst under the potentiodynamic conditions was Cu@Pd/C with
θ(Cu) = 0....21,although Pd-Cu/C was superior during the potentiostatic test. All bimetallic catalysts surpassed
Pd/C in mass activity. The EOR activity of Pt/C was higher compared to Pd-based catalysts at low potentials,
both in terms of specific and mass activity, but with a significant decline over a 30-min potentiostatic stability
test.
Keywords:
Ethanol oxidation / Palladium / Copper / Electrochemically active surface area / Fuel cellSource:
Journal of Electroanalytical Chemistry, 2023, 944, 117673-Publisher:
- Elsevier B.V.
Funding / projects:
- AdCatFC - Advanced Catalysts for Low Temperature Fuel Cells: From Model System to Sustainable Catalysts (RS-ScienceFundRS-Ideje-7739802)
- Ministry of Science, Technological Development and Innovation of the Republic of Serbia, institutional funding - 200135 (University of Belgrade, Faculty of Technology and Metallurgy) (RS-MESTD-inst-2020-200135)
- Ministry of Science, Technological Development and Innovation of the Republic of Serbia, institutional funding - 200026 (University of Belgrade, Institute of Chemistry, Technology and Metallurgy - IChTM) (RS-MESTD-inst-2020-200026)
- Serbian Academy of Sciences and Arts (Contract No. F141)
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Institut za multidisciplinarna istraživanjaTY - JOUR AU - Obradović, Maja AU - Lačnjevac, Uroš AU - Radmilovic, Vuk AU - Gavrilović-Wohlmuther, Aleksandra AU - Kovač, Janez AU - Rogan, Jelena R. AU - Radmilović, Velimir R. AU - Gojković, Snežana Lj. PY - 2023 UR - http://rimsi.imsi.bg.ac.rs/handle/123456789/2782 AB - Two types of Cu-modified Pd catalysts supported on high area carbon were prepared: Pd nanoparticles modified with a sub-monolayer of underpotentially deposited Cu (Cu@Pd/C) and Pd-Cu alloy nanoparticles (Pd-Cu/C), and examined for the ethanol oxidation reaction (EOR) in alkaline solution. The catalysts were characterized by energy-dispersive X-ray spectroscopy, X-ray diffraction, transmission electron microscopy and X-ray photoelectron spectroscopy, as well as cyclic voltammetry. As reference catalysts, Pd/C and Pt/C were used. The electrochemically active surface area of all samples was determined from COads and Cuupd desorption and Pd oxide reduction, and used to assess their intrinsic activity for EOR. Intimate contact of Pd with Cu atoms enhanced its activity, regardless of the type of bimetal catalyst. The atomic Pd:Cu ratio between 2:1 and 4:1 appears to be optimal for high activity. The most active catalyst under the potentiodynamic conditions was Cu@Pd/C with θ(Cu) = 0.21,although Pd-Cu/C was superior during the potentiostatic test. All bimetallic catalysts surpassed Pd/C in mass activity. The EOR activity of Pt/C was higher compared to Pd-based catalysts at low potentials, both in terms of specific and mass activity, but with a significant decline over a 30-min potentiostatic stability test. PB - Elsevier B.V. T2 - Journal of Electroanalytical Chemistry T1 - Palladium-copper bimetallic surfaces as electrocatalysts for the ethanol oxidation in an alkaline medium SP - 117673 VL - 944 DO - 10.1016/j.jelechem.2023.117673 ER -
@article{ author = "Obradović, Maja and Lačnjevac, Uroš and Radmilovic, Vuk and Gavrilović-Wohlmuther, Aleksandra and Kovač, Janez and Rogan, Jelena R. and Radmilović, Velimir R. and Gojković, Snežana Lj.", year = "2023", abstract = "Two types of Cu-modified Pd catalysts supported on high area carbon were prepared: Pd nanoparticles modified with a sub-monolayer of underpotentially deposited Cu (Cu@Pd/C) and Pd-Cu alloy nanoparticles (Pd-Cu/C), and examined for the ethanol oxidation reaction (EOR) in alkaline solution. The catalysts were characterized by energy-dispersive X-ray spectroscopy, X-ray diffraction, transmission electron microscopy and X-ray photoelectron spectroscopy, as well as cyclic voltammetry. As reference catalysts, Pd/C and Pt/C were used. The electrochemically active surface area of all samples was determined from COads and Cuupd desorption and Pd oxide reduction, and used to assess their intrinsic activity for EOR. Intimate contact of Pd with Cu atoms enhanced its activity, regardless of the type of bimetal catalyst. The atomic Pd:Cu ratio between 2:1 and 4:1 appears to be optimal for high activity. The most active catalyst under the potentiodynamic conditions was Cu@Pd/C with θ(Cu) = 0.21,although Pd-Cu/C was superior during the potentiostatic test. All bimetallic catalysts surpassed Pd/C in mass activity. The EOR activity of Pt/C was higher compared to Pd-based catalysts at low potentials, both in terms of specific and mass activity, but with a significant decline over a 30-min potentiostatic stability test.", publisher = "Elsevier B.V.", journal = "Journal of Electroanalytical Chemistry", title = "Palladium-copper bimetallic surfaces as electrocatalysts for the ethanol oxidation in an alkaline medium", pages = "117673", volume = "944", doi = "10.1016/j.jelechem.2023.117673" }
Obradović, M., Lačnjevac, U., Radmilovic, V., Gavrilović-Wohlmuther, A., Kovač, J., Rogan, J. R., Radmilović, V. R.,& Gojković, S. Lj.. (2023). Palladium-copper bimetallic surfaces as electrocatalysts for the ethanol oxidation in an alkaline medium. in Journal of Electroanalytical Chemistry Elsevier B.V.., 944, 117673. https://doi.org/10.1016/j.jelechem.2023.117673
Obradović M, Lačnjevac U, Radmilovic V, Gavrilović-Wohlmuther A, Kovač J, Rogan JR, Radmilović VR, Gojković SL. Palladium-copper bimetallic surfaces as electrocatalysts for the ethanol oxidation in an alkaline medium. in Journal of Electroanalytical Chemistry. 2023;944:117673. doi:10.1016/j.jelechem.2023.117673 .
Obradović, Maja, Lačnjevac, Uroš, Radmilovic, Vuk, Gavrilović-Wohlmuther, Aleksandra, Kovač, Janez, Rogan, Jelena R., Radmilović, Velimir R., Gojković, Snežana Lj., "Palladium-copper bimetallic surfaces as electrocatalysts for the ethanol oxidation in an alkaline medium" in Journal of Electroanalytical Chemistry, 944 (2023):117673, https://doi.org/10.1016/j.jelechem.2023.117673 . .