The surface electric property of Cu2O microcrystal affects the interaction of facets with substance in the aqueous solution, and hence plays a key role in determining the photocatalytic activity. In this paper, the capability of Cu2O microcrystals with exclusive {111}, {110} or both lattice surfaces in reducing Ag+ to Ag-0 were investigated. Ag particles selectively deposited on {111} surfaces of Cu2O, while not on {110} surfaces. The different behaviors of the two surfaces are mainly attributed to their different electric properties: negatively-charged {111} surfaces absorb Ag+ ions while positively-charged {110} surfaces repel them. Raman scattering of Cu2O {111} surfaces was enhanced by the photo-deposition of Ag particles. (C) 2013 Elsevier B. V. All rights reserved.