COPPER OXIDATION IN AIR ELECTROCHEMICAL REDUCTION

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Presentation transcript:

COPPER OXIDATION IN AIR ELECTROCHEMICAL REDUCTION IN SITU COPPER OXIDATION IN AIR and its ELECTROCHEMICAL REDUCTION R. S. Huang, C. J. Lin State Key Laboratory for Physical Chemistry of Solid Surfaces Xiamen University, Xiamen 361005, P. R. China R. S. Lillard Materials Science and Technology Division Los Alamos National Laboratory, Los Alamos, NM 87545, USA H. S. Isaacs Materials Science Department Brookhaven National Laboratory, Upton, NY 11973, USA FUNDING U.S. Department of Energy, Basic Energy Sciences

Copper single crystal sphere (111) 250o C O2 30 minutes (110) 178oC (100) (110) (111) Cathcart 1956 (100) (111) (110) Thickness (nm) Time (min) 100 60 178oC

orientation of multi-grain samples 5 mm SEM electron backscatter Kikuchi bands orientation of multi-grain samples 5 mm

reduction in oxidation in air Experimental 0.2 M BO3 pH 10 microscope calomel reference electrode SAMPLE counter electrode transparent lid transparent tape microscope and annular lighting reduction in 0.2 M BO3 pH 10 microscope and annular lighting heating element coarse grain Cu sample oxidation in air

Air Oxidation 1 mm

Air Oxidation 0 Time (min) 25 350 25 Temperature ( oC ) (I) (I) 1 mm

reduction in 0.2 M BO3 pH 10

reduction in 0.2 M BO3 pH 10 (I) (I) (I)

Current Density (mA/cm detection of small changes using difference imaging II III I a c b 0.5 mm -1.4 -0.7 -1.5 -1 -0.5 5 10 15 20 Current Density (mA/cm 2 ) Potential (V) Time (min) (I) 0.5mm 0.5mm b

* summary air borate CuO Cu2O Cu Cu+ time time Cu+ Temperature ( oC ) 0 Time (min) 25 350 25 Temperature ( oC ) Cu+ CuO Cu2O time