The structure and phase behavior of electrodeposited halides on single-crystal metal surfaces

Synchrotron X-ray scattering results of halide monolayers of bromide and iodide on single-crystal electrodes are presented. Both commensurate and incommensurate structures are observed. The incommensurate structures electrocompress with increasing potential. The relative roles of the halide-halide and the substrate-halide interactions are discussed for iodide on Au(1 1 1), Ag(1 1 1), and Pt(1 1 1) and for bromide on Au(1 1 1), Ag(1 1 1) and Au(1 0 0).