The study of reconstructed electrode surfaces: Au(100)-(5×20)

The effect of surface reconstruction on the capacitance of Au(100) surfaces

“…Recently, Ocko et.al. [10] reported an in-situ x-ray diffraction analysis of the structure of Au(100) surface in 0.01 M HCI04 as a function of potential, results that were completely consistent with the ex-situ LEED results by Kolb and Schneider [6,7], including the potential induced (1 x 1) -7(5 x 20) transformation. These studies provide very convincing evidence that the (5 x 20) : ( I x I) transformations are quasi-reversible and occur in a potential region that is within ± 0.5 V of the pzc of either surface.…”

“…They have also published capacitance curves [6][7][8] which show dramatic changes in the shape of these curves when the reconstruction is lifted, and reported a ca. -0.2 V shift in the pzc between (100) -(5 x 20) and (100) -(1 x 1) surface.…”

“…-0.2 V shift in the pzc between (100) -(5 x 20) and (100) -(1 x 1) surface. Kolb and Schneider [6,7] reported that the (5 x 20) reconstruction is stable in 0.01 M HCI04 up to a potential ca. 0.2 V above the pzc, but in acids with specifically adsorbing anions (HS04-, CI-) the (5 x 20) ~ (1 x 1) transformation is shifted negatively by 0.2 -0.4 V, depending on the anion and the concentration.…”

“…The stability of the Au(100) -(5 x 20) surface in electrolyte has been studied extensively by Kolb and co-workers [6][7][8][9] using a combined UHV-electrochemical system and LEED analysis of emersed electrodes. They have also published capacitance curves [6][7][8] which show dramatic changes in the shape of these curves when the reconstruction is lifted, and reported a ca.…”

First-principles studies of Au(100)-hex reconstruction in an electrochemical environment

“…The reconstruction is reversible. [11][12][13][14] In this system, the potential of zero charge ͑PZC͒ for Au͑100͒-hex and Au͑100͒ are +0.30 V and +0.08 V with reference to the saturated calomel electrode ͑SCE͒, respectively.…”