Underpotential deposition of hydrogen on MoPt 4 intermetallic phase in acid solution: Temperature dependence
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2004
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Potentiodynamic studies of the underpotential deposition of hydrogen (H upd ) on MoPt 4 electrode in 0.5 mol dm -3 HClO 4 aqueous solution in the range of temperature from 275 to 312 K are made and thermodynamic state functions for the hydrogen adsorption are determined. Theoretical treatment of the experimental results is derived from H upd electrochemical adsorption isotherm. It is determined that ΔG ads θ (H upd ), as a function of temperature, varies with the surface coverage from ~-20 kJ mol -1 (θ=0). The increase of ΔG ads θ (H upd ) with the surface coverage indicates the repulsive interactions between H upd adatoms. From the temperature dependence of the Gibbs energy of adsorption, the enthalpy and entropy of adsorption are calculated. The values of these functions are determined to be ΔH ads(θ=0) θ =4.5 kJ mol -1 and ΔS ads(θ=0) θ =82 J mol -1 K -1 . The value of ΔH ads θ allows determinations of the bond energy between electrode surface and H upd , which is found to be E M-H ...=213 kJ mol -1 for θ=0. The lateral repulsion interactions are the reasons why M-H upd bond energy decreases significantly with the increase of coverage so the saturation coverage is much less than 1 in the UPD potential region.
Ključne reči:
Bond energy / Hydrogen adsorption / Temperature effect / Thermodynamic state functionsIzvor:
International Journal of Hydrogen Energy, 2004, 29, 8, 835-842Izdavač:
- Elsevier Ltd
Finansiranje / projekti:
- This paper has been supported by and carried out within EU Project ‘Apollon’, Contract Nr. ENK5-CT-2001-00572, EU Project Nr. NNES-2001-00187, and EU Project ‘Prometheas’, Contract Nr. ICA2-2001-10037.
- This work is financially supported by the Ministry of Science, Technologies and Development, Republic of Serbia, under Contact No. 1825.
Institucija/grupa
Tehnološko-metalurški fakultetTY - JOUR AU - Vračar, Lj. AU - Krstajić, Nedeljko AU - Neophytides, S.G. AU - Jakšić, J. PY - 2004 UR - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5419 AB - Potentiodynamic studies of the underpotential deposition of hydrogen (H upd ) on MoPt 4 electrode in 0.5 mol dm -3 HClO 4 aqueous solution in the range of temperature from 275 to 312 K are made and thermodynamic state functions for the hydrogen adsorption are determined. Theoretical treatment of the experimental results is derived from H upd electrochemical adsorption isotherm. It is determined that ΔG ads θ (H upd ), as a function of temperature, varies with the surface coverage from ~-20 kJ mol -1 (θ=0). The increase of ΔG ads θ (H upd ) with the surface coverage indicates the repulsive interactions between H upd adatoms. From the temperature dependence of the Gibbs energy of adsorption, the enthalpy and entropy of adsorption are calculated. The values of these functions are determined to be ΔH ads(θ=0) θ =4.5 kJ mol -1 and ΔS ads(θ=0) θ =82 J mol -1 K -1 . The value of ΔH ads θ allows determinations of the bond energy between electrode surface and H upd , which is found to be E M-H =213 kJ mol -1 for θ=0. The lateral repulsion interactions are the reasons why M-H upd bond energy decreases significantly with the increase of coverage so the saturation coverage is much less than 1 in the UPD potential region. PB - Elsevier Ltd T2 - International Journal of Hydrogen Energy T1 - Underpotential deposition of hydrogen on MoPt 4 intermetallic phase in acid solution: Temperature dependence EP - 842 IS - 8 SP - 835 VL - 29 DO - 10.1016/S0360-3199(03)00154-X ER -
@article{ author = "Vračar, Lj. and Krstajić, Nedeljko and Neophytides, S.G. and Jakšić, J.", year = "2004", abstract = "Potentiodynamic studies of the underpotential deposition of hydrogen (H upd ) on MoPt 4 electrode in 0.5 mol dm -3 HClO 4 aqueous solution in the range of temperature from 275 to 312 K are made and thermodynamic state functions for the hydrogen adsorption are determined. Theoretical treatment of the experimental results is derived from H upd electrochemical adsorption isotherm. It is determined that ΔG ads θ (H upd ), as a function of temperature, varies with the surface coverage from ~-20 kJ mol -1 (θ=0). The increase of ΔG ads θ (H upd ) with the surface coverage indicates the repulsive interactions between H upd adatoms. From the temperature dependence of the Gibbs energy of adsorption, the enthalpy and entropy of adsorption are calculated. The values of these functions are determined to be ΔH ads(θ=0) θ =4.5 kJ mol -1 and ΔS ads(θ=0) θ =82 J mol -1 K -1 . The value of ΔH ads θ allows determinations of the bond energy between electrode surface and H upd , which is found to be E M-H =213 kJ mol -1 for θ=0. The lateral repulsion interactions are the reasons why M-H upd bond energy decreases significantly with the increase of coverage so the saturation coverage is much less than 1 in the UPD potential region.", publisher = "Elsevier Ltd", journal = "International Journal of Hydrogen Energy", title = "Underpotential deposition of hydrogen on MoPt 4 intermetallic phase in acid solution: Temperature dependence", pages = "842-835", number = "8", volume = "29", doi = "10.1016/S0360-3199(03)00154-X" }
Vračar, Lj., Krstajić, N., Neophytides, S.G.,& Jakšić, J.. (2004). Underpotential deposition of hydrogen on MoPt 4 intermetallic phase in acid solution: Temperature dependence. in International Journal of Hydrogen Energy Elsevier Ltd., 29(8), 835-842. https://doi.org/10.1016/S0360-3199(03)00154-X
Vračar L, Krstajić N, Neophytides S, Jakšić J. Underpotential deposition of hydrogen on MoPt 4 intermetallic phase in acid solution: Temperature dependence. in International Journal of Hydrogen Energy. 2004;29(8):835-842. doi:10.1016/S0360-3199(03)00154-X .
Vračar, Lj., Krstajić, Nedeljko, Neophytides, S.G., Jakšić, J., "Underpotential deposition of hydrogen on MoPt 4 intermetallic phase in acid solution: Temperature dependence" in International Journal of Hydrogen Energy, 29, no. 8 (2004):835-842, https://doi.org/10.1016/S0360-3199(03)00154-X . .