Cuprous oxide (Cu2O)(111) crystals have been prepared at 65 degrees C in we
ak acidic media (pH 4.7) by electrodeposition. The morphology was observed
by scanning electron microscopy and X-ray diffraction analysis was used for
investigation of the crystal phase. When a low cathodic current, -0.5 mA/c
m(2), was applied crystals formed on platinum electrode having only one pha
se, Cu2O (111), and cuprous oxide was epitaxially grown with a triangular s
tructure of (111) phase although the electrolysis time was different. The r
ole of a local enhancement of pH at the cathode is observed to have facilit
ated the deposition of Cu2O in weak acidic solution. (C) 1999 The Electroch
emical Society. S1099-0062(99)06-113-1. All rights reserved.