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Electrodeposition of epitaxial Co(OH)2 on gold and conversion to epitaxial CoOOH and Co3O4

Published online by Cambridge University Press:  23 September 2016

Caleb M. Hull
Affiliation:
Department of Chemistry and Graduate Center for Materials Research, Missouri University of Science and Technology, Rolla, Missouri 65409-1170
Jakub A. Koza
Affiliation:
Department of Chemistry and Graduate Center for Materials Research, Missouri University of Science and Technology, Rolla, Missouri 65409-1170
Jay A. Switzer*
Affiliation:
Department of Chemistry and Graduate Center for Materials Research, Missouri University of Science and Technology, Rolla, Missouri 65409-1170
*
a) Address all correspondence to this author. e-mail: jswitzer@mst.edu
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Abstract

An electrodeposition method for growing epitaxial Co(OH)2 films on single crystalline gold (111), (100), and (110) substrates is described. The films were grown by electrochemical reduction of [Co(en)3]3+ in an alkaline electrolyte. The Co(OH)2 grew with a [0001] out-of-plane orientation on all the gold crystal orientations. The in-plane orientation follows the symmetry of the gold (111), (100), and (110) substrates. The Co(OH)2 can be converted to CoOOH by electrochemical oxidation in 1 M KOH at 95 °C, and after conversion remains epitaxial with a [0001] out-of-plane orientation. The CoOOH film can be further converted to epitaxial Co3O4 with a [111] out-of-plane orientation by decomposition of the CoOOH film in air at 300 °C. This synthesis method allows for a simple fabrication of epitaxial catalysts and could be useful to probe the catalytic activity of specific crystal planes.

Type
Articles
Copyright
Copyright © Materials Research Society 2016 

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Footnotes

b)

These authors contributed equally to this work.

Contributing Editor: Edson Roberto Leite

References

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