2014 Volume 82 Issue 5 Pages 351-354
Real surface structures of Pd(110) = 2(111)-(111) and Pd(311) = 2(100)-(111) have been determined using surface X-ray scattering (SXS) at 0.5 V (RHE) in 0.1 M HClO4 saturated with Ar and O2. Both surfaces have unreconstructed (1 × 1) structures. These results differ from those of Pt(110) and Pt(311) of which surfaces are reconstructed to (1 × 2) in 0.1 M HClO4. Interlayer spacing between the first and the second layer d12 is expanded on Pd(110) in O2 saturated solution, whereas the spacing d12 on Pd(311) is larger than that of the bulk in both Ar and O2 saturated solutions.