A Mathematical Model for Her Reaction to Determine Different Pt loads on Pt/C Electrodes

A Mathematical Model for Her Reaction to Determine Different Pt loads on Pt/C Electrodes

L. Ortega-ChavezE. Herrera-Peraza Y. Verde-Gomez 

Instituto Tecnológico de Chihuahua II, Av. de las Industrias 11101, Chihuahua, Chih., México 2Centro de Investigación en Materiales Avanzados, Miguel de Cervantes 120, Complejo Industrial Chihuahua C. P. 31109, Chihuahua, Chih.

Centro de Investigación en Materiales Avanzados, Miguel de Cervantes 120, Complejo Industrial Chihuahua C. P. 31109, Chihuahua, Chih.

Instituto Tecnológico de Cancún, Av. Kabah Km. 3, Cancún, Quintana Roo, México

Corresponding Author Email: 
laura.ortegach@gmail.com
Page: 
107-111
|
DOI: 
https://doi.org/10.14447/jnmes.v14i2.118
Received: 
6 November 2010
|
Accepted: 
15 January 2010
|
Published: 
5 April 2010
| Citation
Abstract: 

In the preparation of electrodes Pt / C, one of the highlights is its characterization, particularly the possibility of determining the effective charge of platinum available to carry out a reaction by a nondestructive technique. Electrochemical impedance spectroscopy (EIS) is a technique that provides high precision measurements, producing a stable response without significantly altering the system under study. This paper proposes the use of a hydrogen evolution reaction (HER) mathematical model, validated by experimental data obtained from the implementation of the EIS technique to electrodes with different Platinum loads, in a wide range of frequencies and five different overpotentials. The model takes into account the kinetic, diffusive and adsorption aspects, and also allows to obtain the rate constants for each step of the HER reaction in each of the electrodes used. Although this methodology was used only for Pt/C electrodes suggests a much broader application that extends to any metal electrodes that are capable of evolving hydrogen, with minimal modifications for each particular case.

Keywords: 

electrochemical impedance spectroscopy, modeling, hydrogen evolution, characterization, Pt / C

1. Introduction
2. Experimental Conditions and Modeling
3. Results and Discussion
4. Conclusions
Acknowledgements

We specifically want to thank the Technological Institute of Chihuahua II for all their support in achieving this project.

  References

[1] P.T. Kissinger, H.W.R., Chemical education, 60, 702 (1983).

[2] E. Horwood, University of Southampton, (1990).

[3] Princenton Applied Research, Electrochemical Instruments Group, A review of techniques for electrochemical analysis, (1986).

[4] G. Jerkiewicz, Prog. Surface Science, 57, 137 (1998).

[5] L. Ortega, Thesis Doctoral, CIMAV, Chih., (2009).

[6] L. Ortega, E. Herrera, Y. Verde, J. New Mat. Electrochem. Syst., 11, 125 (2008).

[7] L. Ortega Chávez, E. Herrera Peraza, Y. Verde Gómez, J. New Mat. Electrochem. Syst., 13, 283 (2010).

[8] J.R. Selman and Y.P. Lin, Electrochim. Acta, 38, 2063 (1993).

[9] L. Ortega, E. Herrera, G. Alonso, L. Manzanarez, Y. Verde, A. Keer, Rev. Int. Contam. Ambient., 24, 21 (2008).

[10] T.J. Schmidt, H.A. Gasteiger, G.D. Stab, P.M. Urban, D.M. Kolb, R.J. Behm, J. Electrochem. Soc., 145, 2354 (1998).

[11] D.A. Harrington and B.E. Conway, Electrochim. Acta, 32, 1703 (1987).

[12] D.A. Harrington and P. Van den Driessche, J. Electroanal. Chem., 501, 222 (2001).

[13] B.E. Conway and R.E. White, Modern Aspects of Electrochemistry, Vol. 35, Kluwer/Plenum, N.Y. (2002).

[14] B.E. Conway and J. Bockris, R.E. White, Modern Aspects of Electrochemistry, Vol. 32, Kluwer Academic/Plenum Publishers, N.Y. (1999).

[15] L. Bai, D.A. Harrington and B.E. Conway, Electrochim. Acta, 32, 1713 (1987).

[16] G. Jerkiewicz, Prog. Surface Science, 57, 137 (1998).

[17] B.E. Conway and G. Jerkiewicz, Electrochim. Acta, 45, 4075, (2000).

[18] B.E. Conway and G. Jerkiewicz, Solid State Ionics, 150, 93 (2002).

[19] J.R. Macdonald and W.B. Johnson in Fundamentals of Impedance Spectroscopy, Theory, Experiment and Applications, John Wiley & Sons, Inc, Hoboken, New Jersey, 2005, p.26.

[20] Lasia, Polish J. Chem., 69, 639 (1995).

[21] I.D. Raistrick, D.R. Franceschetti and J.R. Macdonald, in Fundamentals of Impedance Spectroscopy, Theory, Experiment and Applications, John Wiley & Sons, Inc, Hoboken, New Jersey, (2005) p.127.