ISIJ International
Online ISSN : 1347-5460
Print ISSN : 0915-1559
ISSN-L : 0915-1559
In Situ Electrochemical Atomic Force Microscopy with Atomic Resolution of Fe(110) in Sodium Sulfate Aqueous Solution
Nobumitsu HiraiHiromi OkadaShigeta Hara
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2000 Volume 40 Issue 7 Pages 702-705

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Abstract

In situ electrochemical atomic force microscopy (EC-AFM) was used to investigate a bare Fe(110) and an anodically formed oxide on Fe(110) in 0.05 M Na2SO4 aqueous solution under potential control. An unreconstructed Fe(110)–(1×1) structure was observed at -1.9 V in 0.05 M Na2SO4 aqueous solution by keeping the potential in hydrogen evolution region for 10 min. This is the first In situ EC-AFM image with atomic resolution of unpassivated iron electrodes under aqueous solution. We also observed Fe(OH)2(0001)–(1×1) structure of an anodic oxide layer grown on Fe(110) single crystal at -1.2 V in 0.05 M Na2SO4 aqueous solution. From these EC-AFM investigation, we have found an epitaxial relationship of Fe(OH)2(0001)[2110]//Fe(110)[110] between the anodic oxide layer and Fe(110) substrate.

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