Nuclear Engineering and Technology

Korean Nuclear Society (한국원자력학회)
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Electrochemical behavior of dissolved hydrogen at Pt electrode surface in a high temperature LiOH-H3BO3 solution: Effect of chloride ion on the transient current of the dissolved hydrogen

  • Myung-Hee Yun (Nuclear Chemistry Technology Division, Korea Atomic Energy Research Institute) ;
  • Jei-Won Yeon (Nuclear Chemistry Technology Division, Korea Atomic Energy Research Institute)
  • Received : 2023.03.31
  • Accepted : 2023.06.19
  • Published : 2023.10.25
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Abstract

The electrochemical behavior of dissolved hydrogen (H2) was investigated at a Pt electrode in a high temperature LiOH-H3BO3 solution. The diffusion current of the H2 oxidation was proportional to the concentration of the dissolved H2 as well as the reciprocal of the temperature. In the polarization curve, a potential region in which the oxidation current decreases despite an increase in the applied potential between the H2 oxidation and the water oxidation regions was observed. This potential region was interpreted as being caused by the formation of a Pt oxide layer. Using the properties of the Cl- ion that reduces the growth rate of the Pt oxide layer, it was confirmed that there is a correlation between the Cl- ion concentration and the transient current of the H2 oxidation.

Keywords

Acknowledgement

This work was supported by the National Research Foundation of Korea (NRF) Grant funded by the Korea government (MSIT) (NRF-2017M2A8A4015281, 2021M2E3A3040092, RS-2022-00144202). Additionally, this work was supported by the KAERI institutional program (Project No. 522330-22).

References

  1. C.J. Wood, PWR Primary Water Chemistry Guidelines: Revision 3, Electric Power Research Institute, Palo Alto, CA, USA, 1995. Report EPRI TR-105714.
  2. K. Ishigure, T. Nukii, S. Ono, Analysis of water radiolysis in relation to stress corrosion cracking of stainless steel at high temperatures e effect of water radiolysis on limiting current densities of anodic and cathodic reactions under irradiation, J. Nucl. Mater. 350 (2006) 56-65. https://doi.org/10.1016/j.jnucmat.2005.11.011
  3. G.D. Fearnehough, A. Cowan, The effect of hydrogen and strain rate on the "ductile-brittle" behaviour of Zircaloy, J. Nucl. Mater. 22 (1967) 137-147. https://doi.org/10.1016/0022-3115(67)90023-2
  4. A. Cowan, W.J. Langford, Effect of hydrogen and neutron irradiation on the failure of flawed Zircaloy-2 pressure tubes, J. Nucl. Mater. 30 (1969) 271-281. https://doi.org/10.1016/0022-3115(69)90242-6
  5. E. Smith, Near threshold delayed hydride crack growth in zirconium alloys, J. Mater. Sci. 30 (1995) 5910-5914. https://doi.org/10.1007/BF01151504
  6. T. Magnin, D. Noel, R. Rios, Microfractographic aspects of stress corrosion cracking of Inconel 600 in a pressurized water reactor environment, Mat. Sci. Eng. A-Struct. 177 (1994) L11-L14. https://doi.org/10.1016/0921-5093(94)90503-7
  7. D.M. Symons, The effect of hydrogen on the fracture toughness of alloy X-750 at elevated temperatures, J. Nucl. Mater. 265 (1999) 225-231. https://doi.org/10.1016/S0022-3115(98)00888-5
  8. K.A. Burrill, Some aspects of water chemistry in the CANDU primary coolant circuit, in: Proceedings of JAIF International Conference on Water Chemistry in Nuclear Power Plants, Kashiwazaki, Japan, 1998. October 13-16.
  9. J.-W. Yeon, Y. Jung, S.-I. Pyun, Deposition behaviour of corrosion products on the Zircaloy heat transfer surface, J. Nucl. Mater. 354 (2006) 163-170. https://doi.org/10.1016/j.jnucmat.2006.03.017
  10. D.M. Symons, The effect of hydrogen on the fracture toughness of alloy X-750 at elevated temperatures, J. Nucl. Mater. 265 (1999) 225-231. https://doi.org/10.1016/S0022-3115(98)00888-5
  11. J.O.'M. Bockris, A.K. Reddy, Modern Electrochemistry, Plenum/Resetta ed., Plenum Press, New York, 1973.
  12. E. Gileadi, E. Kirowa-Eisner, J. Penciner, Interfacial Electrochemistry, Addison-Wesley Publishing Company, London, 1975.
  13. B.E. Conway, L. Bai, Determination of adsorption of OPD H species in the cathodic hydrogen evolution reaction at Pt in relation to electrocatalysis, J. Electroanal. Chem. 198 (1986) 149-175. https://doi.org/10.1016/0022-0728(86)90033-1
  14. J.-W. Yeon, S.-I. Pyun, Roles of adsorbed OH and adsorbed H in the oxidation of hydrogen and the reduction of UO2+2ions at Pt electrodes under nonconventional conditions, J. Appl. Electrochem. 37 (2007) 905-912. https://doi.org/10.1007/s10800-007-9329-x
  15. J.-W. Yeon, M.H. Yun, K. Song, Introduction to a new real-time water chemistry measurement system, in: 15th International Conference on Environmental Degradation of Materials in Nuclear Power Systems - Water Reactors, Colorado Springs, USA, 2011. August 7-11.
  16. W.M. Flarsheim, Y. Tsou, I. Tratchtenberg, K.P. Johnston, A.J. Bard, Electrochemistry in near-critical and supercritical fluids. 3. Studies of bromide, iodide, and hydroquinone in aqueous solutions, J. Phys. Chem. 90 (1986) 3857-3862. https://doi.org/10.1021/j100407a066
  17. C. Liu, S.R. Snyder, A.J. Bard, Electrochemistry in near-critical and supercritical fluids. 9. Improved apparatus for water systems (23-385 ℃). The oxidation of hydroquinone and iodide, J. Phys. Chem. B 101 (1997) 1180-1185. https://doi.org/10.1021/jp9627741
  18. H.A. Baroody, G. Jerkiewicz, M.H. Eikerling, Modelling oxide formation and growth on platinum, J. Chem. Phys. 146 (2017), 144102.