Abstract
Abstract Structural effects on the hydrogen oxidation reactions (HOR) and the hydrogen evolution reactions (HER) have been studied on (n−1)(1 1 1)−(1 1 0), n(1 0 0)−(1 1 1), n(1 0 0)−(1 1 0) and n(1 1 1)−(1 0 0) series of Pt using rotating disk electrode (RDE) in 0.1 M HClO4 saturated with H2. The value of the exchange current density j0 increases linearly with the increase of the step atom density dS from n = ∞ to n = 9, where n denotes the number of terrace atomic rows, on (n−1)(1 1 1)−(1 1 0), n(1 0 0)−(1 1 1), and n(1 0 0)−(1 1 0) series. This indicates that the activity for the HOR/HER of the step is higher than that of the terrace. The values of j0 of (n−1)(1 1 1)−(1 1 0), n(1 0 0)−(1 1 1) and n(1 0 0)−(1 1 0) series become constant on the surfaces with n ⩽ 9, whereas those of n(1 1 1)−(1 0 0) series increase with the increase of dS. The activity for the HOR/HER per step atom increases in the sequence: n(1 1 1)−(1 0 0)
Published Version
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