Electrodissolution of electrodeposited iron oxides

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Galvanostatic reduction of ferric oxide was studied in phosphate solutions over a range of pH values. The oxides were prepared on gold by anodic electrodeposition from dilute ferrous borate solution. With increased pH, the potential of the reduction arrests decreased and the charge associated with the arrest increased. A dependence of -60 mV/pH was observed except between pH 7.5 and 8.5 where the slope approximated -180 mV/pH. Above pH 7.5 the slope was consistent with the thermodynamic predicted slope of -180 mV/pH expected from reductive dissolution of ferric oxide forming soluble ferrous ions. At higher pH values, a slope of ... continued below

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7 p.

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Isaacs, H.S.; Ryan, M.P.; Kalonousky, D.N. & Virtanen, S. December 31, 1996.

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  • Isaacs, H.S.
  • Ryan, M.P. Brookhaven National Lab., Upton, NY (United States)
  • Kalonousky, D.N. State Univ. of New York, Stony Brook, NY (United States). Dept. of Materials Science
  • Virtanen, S. Swiss Federal Inst. of Tech., Zurich (Switzerland). Inst. of Materials Chemistry and Corrosion

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Description

Galvanostatic reduction of ferric oxide was studied in phosphate solutions over a range of pH values. The oxides were prepared on gold by anodic electrodeposition from dilute ferrous borate solution. With increased pH, the potential of the reduction arrests decreased and the charge associated with the arrest increased. A dependence of -60 mV/pH was observed except between pH 7.5 and 8.5 where the slope approximated -180 mV/pH. Above pH 7.5 the slope was consistent with the thermodynamic predicted slope of -180 mV/pH expected from reductive dissolution of ferric oxide forming soluble ferrous ions. At higher pH values, a slope of -60 mV/pH has been accounted for by oxide reduction to form a solid lower valent oxide.

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7 p.

Notes

OSTI as DE97001542

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  • 190. meeting of the Electrochemical Society and technical exhibition, San Antonio, TX (United States), 6-11 Oct 1996

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  • Other: DE97001542
  • Report No.: BNL--63608
  • Report No.: CONF-961040--18
  • Grant Number: AC02-76CH00016
  • Office of Scientific & Technical Information Report Number: 443165
  • Archival Resource Key: ark:/67531/metadc675593

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  • December 31, 1996

Added to The UNT Digital Library

  • July 25, 2015, 2:21 a.m.

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  • Nov. 9, 2015, 7:52 p.m.

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Isaacs, H.S.; Ryan, M.P.; Kalonousky, D.N. & Virtanen, S. Electrodissolution of electrodeposited iron oxides, article, December 31, 1996; Upton, New York. (digital.library.unt.edu/ark:/67531/metadc675593/: accessed November 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.