Electrocatalytic behaviour of MoPt3 intermetallic phase for hydrogen evolution in acid solution
Само за регистроване кориснике
2004
Чланак у часопису (Објављена верзија)
Метаподаци
Приказ свих података о документуАпстракт
Metallurgicaly prepared MoPt3 intermetallic compound has been investigated as electrocatalyst for the cathodic evolution of hydrogen (HER) in 0.5 mol dm-3 HClO4 solution at 298 K. The HER on activated and non-activated electrode has been studied by means of classical steady-state voltammetry and ac impedance spectroscopy measurements. Within the potential range of E = 0,00 - (-0.08) V (RHE), the mechanism of the HER on activated MoPt3 electrode, can be realised as a consecutive combination of the electrosorption of Hads species (Volmer step), followed dominantly by the chemical recombination of Hads species to form H2 (Tafel step), while the contribution of the parallel electrodesorption step (Heyrovski step) is negligible. For potentials E < - 0.080 V (RHE), at practically full coverage of Hads on the electrode surface (θH → 1), the mechanism is a consecutive combination of the Volmer step, followed by Heyrovski step. At the non-activated MoPt3 electrode HER is described by the same m...echanism, but full coverage on the electrode was reached when 14% of the available sites on the electrode surface were occupied by Hads. The Tafel step controls the rate of the HER up to E = - 0.080 V (RHE), and a curvilinear shape of the curve is a result of the influence Hads coverage (θ H) on the rate of the Tafel step.
Кључне речи:
Ac impedance spectroscopy / Hydrogen evolution / MoPt3 intermetallic phaseИзвор:
Journal of New Materials for Electrochemical Systems, 2004, 7, 3, 205-212Издавач:
- Ecole Polytechnique de Montreal
Финансирање / пројекти:
- EU Project “Apollon”, Contract No. ENK5-CT-2001-00572.
- EU Project “Prometheas”, Contract No. ICA2-2001-10037.
- Ministry of Science and Development, Republic of Serbia, under Contract No. 1825.
Институција/група
Tehnološko-metalurški fakultetTY - JOUR AU - Jakšić, Jelen AU - Vračar, Ljiljana AU - Neophytides, Stylianos G. AU - Krstajić, Nedeljko PY - 2004 UR - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5446 AB - Metallurgicaly prepared MoPt3 intermetallic compound has been investigated as electrocatalyst for the cathodic evolution of hydrogen (HER) in 0.5 mol dm-3 HClO4 solution at 298 K. The HER on activated and non-activated electrode has been studied by means of classical steady-state voltammetry and ac impedance spectroscopy measurements. Within the potential range of E = 0,00 - (-0.08) V (RHE), the mechanism of the HER on activated MoPt3 electrode, can be realised as a consecutive combination of the electrosorption of Hads species (Volmer step), followed dominantly by the chemical recombination of Hads species to form H2 (Tafel step), while the contribution of the parallel electrodesorption step (Heyrovski step) is negligible. For potentials E < - 0.080 V (RHE), at practically full coverage of Hads on the electrode surface (θH → 1), the mechanism is a consecutive combination of the Volmer step, followed by Heyrovski step. At the non-activated MoPt3 electrode HER is described by the same mechanism, but full coverage on the electrode was reached when 14% of the available sites on the electrode surface were occupied by Hads. The Tafel step controls the rate of the HER up to E = - 0.080 V (RHE), and a curvilinear shape of the curve is a result of the influence Hads coverage (θ H) on the rate of the Tafel step. PB - Ecole Polytechnique de Montreal T2 - Journal of New Materials for Electrochemical Systems T1 - Electrocatalytic behaviour of MoPt3 intermetallic phase for hydrogen evolution in acid solution EP - 212 IS - 3 SP - 205 VL - 7 UR - https://hdl.handle.net/21.15107/rcub_technorep_5446 ER -
@article{ author = "Jakšić, Jelen and Vračar, Ljiljana and Neophytides, Stylianos G. and Krstajić, Nedeljko", year = "2004", abstract = "Metallurgicaly prepared MoPt3 intermetallic compound has been investigated as electrocatalyst for the cathodic evolution of hydrogen (HER) in 0.5 mol dm-3 HClO4 solution at 298 K. The HER on activated and non-activated electrode has been studied by means of classical steady-state voltammetry and ac impedance spectroscopy measurements. Within the potential range of E = 0,00 - (-0.08) V (RHE), the mechanism of the HER on activated MoPt3 electrode, can be realised as a consecutive combination of the electrosorption of Hads species (Volmer step), followed dominantly by the chemical recombination of Hads species to form H2 (Tafel step), while the contribution of the parallel electrodesorption step (Heyrovski step) is negligible. For potentials E < - 0.080 V (RHE), at practically full coverage of Hads on the electrode surface (θH → 1), the mechanism is a consecutive combination of the Volmer step, followed by Heyrovski step. At the non-activated MoPt3 electrode HER is described by the same mechanism, but full coverage on the electrode was reached when 14% of the available sites on the electrode surface were occupied by Hads. The Tafel step controls the rate of the HER up to E = - 0.080 V (RHE), and a curvilinear shape of the curve is a result of the influence Hads coverage (θ H) on the rate of the Tafel step.", publisher = "Ecole Polytechnique de Montreal", journal = "Journal of New Materials for Electrochemical Systems", title = "Electrocatalytic behaviour of MoPt3 intermetallic phase for hydrogen evolution in acid solution", pages = "212-205", number = "3", volume = "7", url = "https://hdl.handle.net/21.15107/rcub_technorep_5446" }
Jakšić, J., Vračar, L., Neophytides, S. G.,& Krstajić, N.. (2004). Electrocatalytic behaviour of MoPt3 intermetallic phase for hydrogen evolution in acid solution. in Journal of New Materials for Electrochemical Systems Ecole Polytechnique de Montreal., 7(3), 205-212. https://hdl.handle.net/21.15107/rcub_technorep_5446
Jakšić J, Vračar L, Neophytides SG, Krstajić N. Electrocatalytic behaviour of MoPt3 intermetallic phase for hydrogen evolution in acid solution. in Journal of New Materials for Electrochemical Systems. 2004;7(3):205-212. https://hdl.handle.net/21.15107/rcub_technorep_5446 .
Jakšić, Jelen, Vračar, Ljiljana, Neophytides, Stylianos G., Krstajić, Nedeljko, "Electrocatalytic behaviour of MoPt3 intermetallic phase for hydrogen evolution in acid solution" in Journal of New Materials for Electrochemical Systems, 7, no. 3 (2004):205-212, https://hdl.handle.net/21.15107/rcub_technorep_5446 .