Electrocatalysis of the hydrogen oxidation and of the oxygen reduction reactions of Pt and some alloys in alkaline medium

Couturier, G.; Kirk, Donald W.; Hyde, Peter Alden; Srinivasan, S.

doi:10.1016/0013-4686(87)90024-7

Cited by 58 publications

(53 citation statements)

References 6 publications

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“…Thus results from our laboratory indicate that there is a comparably small difference in the TOF on PC Pt in acid and alkaline solution. However, in the literature one order of magnitude lower TOF values are reported for the ORR in alkaline electrolyte [30][31][32]. In these previous studies contradictory values of the Tafel slope from 60 [32] up to 120 mV dec -1 [30,31] are determined, demonstrating that even a basic system like PC Pt is subject to inconsistencies.…”

Section: Comparisonmentioning

confidence: 90%

Investigation of the Oxygen Reduction Activity on Silver – A Rotating Disc Electrode Study

2010

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In this study the oxygen reduction reaction (ORR) is investigated on a nanoparticulate silver electrocatalyst in alkaline solution. The catalytic activity of the catalyst is determined both in terms of mass activity as well as specific activity and turn over frequency, respectively. It is demonstrated that the established mass activities are independent of the applied catalyst loading, an essential requirement for a reasonable analysis. The determination of the electrochemically active surface area (ECA) or the number of electrochemically accessible sites (NECAS), respectively, is performed by the underpotential deposition of lead. The obtained value of the activity is compared to activities of polycrystalline silver and platinum measured in the same electrolyte, as well as to literature data.

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Section: Comparisonmentioning

confidence: 90%

Investigation of the Oxygen Reduction Activity on Silver – A Rotating Disc Electrode Study

2010

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“…This could explain the significantly higher intensity found for the anodic peak (Peak I, in Fig 3b). Furthermore, these functional groups are likely to participate in redox reactions similar to those proposed in equation 1, in addition to those proposed for pristine carbon, adopted from electro-oxidation of hydrogen over Pt (equation 2) [10,11]. The reverse reaction in equation 1 is likely to be responsible for the cathodic peak (Peak II, in Fig 3b) …”

Section: Stability Of Peaksmentioning

confidence: 77%

An insight into Faradaic phenomena in activated carbon investigated by means of the microelectrode technique

Malmberg

Ruíz

Blanco

et al. 2007

Electrochemistry Communications

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Cyclic voltammetry was performed on activated carbon particles in a microelectrode setup to investigate the behaviour of an activated carbon with oxygen functionalities.Quinoid type redox peaks were clearly seen in the potential region around -0.5 V vs.Hg/HgO. After polarization below -0.4 V, an anodic peak confirms previous studies using a pristine carbon, but in the present work much higher in intensity. In addition, a corresponding cathodic peak, not previously reported, was also found. The appearance of this pair of peaks in a functionalized carbon may be connected to reversible hydrogen adsorption together with faradaic reactions involving oxygenated functional groups.

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“…To obtain reliable values for the kinetic parameters, the Butler-Volmer equation was used for optimization on the experimental polarization data, taking into consideration mass transport, kinetics, and thermodynamics: where a α and c α are the transfer coefficients of the HOR and the HER, respectively, and n is the number of electrons transferred. By optimizing equation [4] on the experimental polarization data and noting equation [5] and [6], the exchange current density and transfer coefficients of the HOR and the HER can then be extracted at each temperature. The activation energy of the hydrogen electrode reaction and the Tafel slopes of the HOR and the HER can therefore be determined from the Arrhenius plot.…”

Section: Ecs Transactionsmentioning

confidence: 99%

“…In addition, the Tafel slope of the HOR is also not proportional to the temperature. From Equation [5] and [6], it is seen Pt(111) 2-60 0.1M KOH 46 (10) Pt(110) 2-60 0.1M KOH 23 (10) ECS Transactions, 11 (27) 1-11 (2008) that the Tafel slopes are expected to increase linearly with the temperature, provided that the transfer constants are indeed constant. A direct consequence of the temperature invariant Tafel slope is that the transfer coefficients are temperature dependent, as seen in Figure 5.…”

Section: Ecs Transactions 11 (27) 1-11 (2008)mentioning

confidence: 99%

Kinetics of the Hydrogen Electrode Reaction on Platinum in Alkaline Solutions at Elevated Temperatures

Bao

Macdonald

2008

ECS Trans.

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The kinetics of the hydrogen electrode reaction on a platinized nickel electrode in alkaline solutions over a wide temperature range from ambient up to 220 o C have been investigated employing a controlled hydrodynamic cell. Due to the reversible nature of this reaction, the generalized Butler-Volmer equation was used in optimization upon the polarization data, so as to account for kinetic, thermodynamic, and mass transfer effects. The extracted model parameters are compared with those for other forms of platinum electrode, and platinized nickel shows excellent electrocatalytic activity as demonstrated by the exchange current density. The extracted apparent transfer coefficients for hydrogen evolution and hydrogen oxidation are temperature-dependent, while the apparent Tafel slope of the hydrogen evolution reaction is temperatureindependent (approximately 120mV/dec), which is most probably due to two parallel reactions occurring at the interface with different rates and activation energies. An Arrhenius analysis yields an activation energy of 17.3 kJ/mole for the hydrogen electrode reaction on platinized nickel in alkaline solution.

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Electrocatalysis of the hydrogen oxidation and of the oxygen reduction reactions of Pt and some alloys in alkaline medium

Cited by 58 publications

References 6 publications

Investigation of the Oxygen Reduction Activity on Silver – A Rotating Disc Electrode Study

Investigation of the Oxygen Reduction Activity on Silver – A Rotating Disc Electrode Study

An insight into Faradaic phenomena in activated carbon investigated by means of the microelectrode technique

Kinetics of the Hydrogen Electrode Reaction on Platinum in Alkaline Solutions at Elevated Temperatures

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