The reasons for the sluggish kinetics of the hydrogen adsorption reaction in alkaline media remain a question still to be solved. This information is important to achieve a complete understanding of the mechanistic details that could lead to the production of key catalytic materials necessary for the development of a future hydrogen economy. For a better understanding of this reaction, it is important to acquire information about the thermodynamic parameters characteristic of the different steps in the reaction. Among these, the hydrogen adsorption is a key step in the process of hydrogen evolution. Although some debate still remains about the difference between adsorbed hydrogen in the underpotential deposition (UPD) region and at the overpotential deposition region, there is no doubt that understanding the former can help in the understanding of the latter. Making use of charge density measurements, we report on this paper a thermodynamic study of the hydrogen UPD process on Pt(111) in 0.05M NaOH over the range of temperatures from 283 ≤ T/K ≤ 313. The coulometric features corresponding to HUPD allow for the calculation of the hydrogen coverage and a fit to a Generalized Frumkin isotherm. From these values, different thermodynamic functions for the UPD reaction have been calculated: ΔGads, ΔSads, ΔHads, and the Pt–H bond energy. From extrapolation, a value of was found, which is very close to 0, much lower than previously reported measurements both in acid and in alkaline solutions. Such value has an effect on the enthalpy and bond energy calculations, the latter having a decreasing tendency with pH and coverage. This tendency is completely different from the acidic systems and implies that the change in the thermodynamic functions due to the formation of the double layer and the reorganization of interfacial water has a strong influence on the process in high pH solutions.
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28 December 2021
Research Article|
December 27 2021
On the thermodynamics of hydrogen adsorption over Pt(111) in 0.05M NaOH
Special Collection:
The Chemical Physics of the Electrode-Electrolyte Interface
Luis E. Botello;
Luis E. Botello
Institute of Electrochemistry, University of Alicante
, Alicante, Spain
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V. Climent
;
V. Climent
a)
Institute of Electrochemistry, University of Alicante
, Alicante, Spain
a)Author to whom correspondence should be addressed: [email protected]
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J. M. Feliu
J. M. Feliu
b)
Institute of Electrochemistry, University of Alicante
, Alicante, Spain
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a)Author to whom correspondence should be addressed: [email protected]
b)
Electronic mail: [email protected]
Note: This paper is part of the JCP Special Topic on the Chemical Physics of the Electrode–Electrolyte Interface.
J. Chem. Phys. 155, 244704 (2021)
Article history
Received:
September 29 2021
Accepted:
December 05 2021
Citation
Luis E. Botello, V. Climent, J. M. Feliu; On the thermodynamics of hydrogen adsorption over Pt(111) in 0.05M NaOH. J. Chem. Phys. 28 December 2021; 155 (24): 244704. https://doi.org/10.1063/5.0073313
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