Hostname: page-component-586b7cd67f-dsjbd Total loading time: 0 Render date: 2024-11-24T10:54:43.842Z Has data issue: false hasContentIssue false
  • English
  • Français

Effects of iron-phosphate coating on Ru dissolution in the PtRu thin-film electrodes

Published online by Cambridge University Press:  31 January 2011

Yejun Park ,
Byungjoo Lee ,
Chunjoong Kim ,
Jongmin Kim  and
Byungwoo Park
Yejun Park
Affiliation:
Department of Materials Science and Engineering, and Research Center for Energy Conversion and Storage, Seoul National University, Seoul 151-744, Korea
Byungjoo Lee
Affiliation:
Department of Materials Science and Engineering, and Research Center for Energy Conversion and Storage, Seoul National University, Seoul 151-744, Korea
Chunjoong Kim
Affiliation:
Department of Materials Science and Engineering, and Research Center for Energy Conversion and Storage, Seoul National University, Seoul 151-744, Korea
Jongmin Kim
Affiliation:
Department of Materials Science and Engineering, and Research Center for Energy Conversion and Storage, Seoul National University, Seoul 151-744, Korea
Byungwoo Park*
Affiliation:
Department of Materials Science and Engineering, and Research Center for Energy Conversion and Storage, Seoul National University, Seoul 151-744, Korea
*
a) Address all correspondence to this author. e-mail: [email protected]
Get access

Abstract

The effects of FePO4 nanoscale coating on PtRu thin films were investigated on the block of Ru crossover. Ru dissolution was examined by the accelerated-potential cycles between 0.4 and 1.05 V. The results showed that Ru dissolution from FePO4-coated PtRu surface was inevitable due to the direct contact between the PtRu surface and aqueous electrolyte. However, the FePO4 coating layer on PtRu thin-film electrodes effectively retained the dissolved Ru species, thus preventing the dissolved Ru species from diffusing into the electrolyte. Moreover, the retained Ru species within the FePO4-coating layer were redeposited onto the PtRu surface during the cycling in the fresh electrolyte.

Keywords

CoatingDiffusionRu
Type
Articles
Information
Journal of Materials Research , Volume 24 , Issue 1 , January 2009 , pp. 140 - 144
Copyright
Copyright © Materials Research Society 2009

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1.Carrette, L., Friedrich, K.A., Stimming, U.: Fuel cells—Fundamentals and applications. Fuel Cells 1, 5 20013.0.CO;2-G>CrossRefGoogle Scholar
2.Reddington, E., Sapienza, A., Gurau, B., Viswanathan, R., Sarangapani, S., Smotkin, E.S., Mallouk, T.E.: Combinatorial electrochemistry: A highly parallel, optical screening method for discovery of better electrocatalysts. Science 280, 1735 1998CrossRefGoogle ScholarPubMed
3.Lee, B., Kim, C., Park, Y., Kim, T-G., Park, B.: Nanostructured platinum/iron phosphate thin-film electrodes for methanol oxidation. Electrochem. Solid-State Lett. 9, E27 2006CrossRefGoogle Scholar
4.Watanabe, M., Motoo, S.: Electrocatalysis by ad-atoms: Part II. Enhancement of the oxidation of methanol on platinum by ruthenium ad-atoms. J. Electroanal. Chem. 60, 267 1975CrossRefGoogle Scholar
5.Gasteiger, H., Markovic, N., Ross, P., Cairns, E.J.: Methanol electrooxidation on well-characterized platinum-ruthenium bulk alloys. J. Phys. Chem. 97, 12020 1993CrossRefGoogle Scholar
6.Goodenough, J., Manoharan, R., Shukla, A.K., Rameshand, K.V.: Intraalloy electron transfer and catalyst performance: A spectroscopic and electrochemical study. Chem. Mater. 1, 391 1989CrossRefGoogle Scholar
7.Herrero, E., Franaszczuk, K., Wiekowski, A.: Crystal planes of platinum: An integrated voltammetric and chronoamperometric study. J. Phys. Chem. 98, 5074 1994CrossRefGoogle Scholar
8.Kim, C., Lee, B., Park, Y., Park, B., Lee, J., Kim, H.: Iron-phosphate/platinum/carbon nanocomposites for enhanced electrocatalytic stability. Appl. Phys. Lett. 91, 113101 2007CrossRefGoogle Scholar
9.Piela, P., Eickes, C., Brosha, E., Garzon, F., Zelenay, P.: Ruthenium crossover in direct methanol fuel cell with Pt-Ru black anode. J. Electrochem. Soc. 151, A2053 2004CrossRefGoogle Scholar
10.Lee, B., Kim, C., Park, Y., Oh, Y., Park, B.: The effects of ruthenium-oxidation states on Ru dissolution in PtRu thin-film electrodes. (unpublished).Google Scholar
11.Lee, J-G., Kim, B., Cho, J., Kim, Y-W., Park, B.: Effect of AlPO4-nanoparticle coating concentration on high-cutoff-voltage electrochemical performances in LiCoO2. J. Electrochem. Soc. 151, A801 2004CrossRefGoogle Scholar
12.Cho, J., Lee, J-G., Kim, B., Park, B.: Effect of P2O5 and AlPO4 coating on LiCoO2 cathode material. Chem. Mater. 15, 3190 2003CrossRefGoogle Scholar
13.Cho, J., Kim, Y-W., Kim, B., Lee, J-G., Park, B.: A breakthrough in the safety of lithium secondary batteries by coating the cathode material with AlPO4 nanoparticles. Angew. Chem. Int. Ed. 42, 1618 2003CrossRefGoogle ScholarPubMed
14.Pourbaix, M.: Atlas of Biochemical Equilibria in Aqueous Solutions Gauthier-Villars Paris, France 1963 346Google Scholar
15.Schmidt, T.J., Gasteiger, H.A., Stäb, G.D., Uraban, P.M., Kolb, D.M., Behm, R.J.: Characterization of high surface area electrocatalysts using a rotating disk electrode configuration. J. Electrochem. Soc. 145, 2354 1998CrossRefGoogle Scholar
16.Vielstich, W.: Handbook of Fuel Cells-Fundamentals Technology and Applications Vol. 2, John Wiley & Sons London, UK 2003 155Google Scholar
17.Green, C.L., Kucernak, A.: Determination of the platinum and ruthenium surface areas in platinum-ruthenium electrocatalysts by underpotential deposition of copper. 2. Effect of surface composition on activity. J. Phys. Chem. B 106, 11446 2002CrossRefGoogle Scholar
18.Holstein, W.L., Rosenfeld, H.D.: In-situ x-ray absorption spectroscopy study of Pt and Ru chemistry during methanol electrooxidation. J. Phys. Chem. B 109, 2176 2005CrossRefGoogle ScholarPubMed