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- W1514383756 abstract "The rate of hydroquinone (HQ) chemisorption from aqueous H 2 SO 4 onto annealed (smooth) and platinized (rough) polycrystalline Pt has been studied. Previously, equilibrium adsorption measurements indicated that at smooth Pt surfaces, adsorption of HQ at c HQ ⩽ 0.1 m M yielded flat (η 6 )-oriented species while adsorption at c HQ ⩾ 1 m M resulted in edge (2,3-η 2 )-attached intermediates. Edge-attached species were not formed efficiently at roughened Pt surfaces. The present data show that the rate of η 6 -HQ chemisorption was significantly lower at roughened than at smooth surfaces. Analysis of the rate data gave the following enthalpies and entropies of activation at smooth (sm) and platinized (pt) surfaces: ΔH ≠ sm,0.1 m M = 12.5 kJ/mol; Δ H ≠ sm,2 m M = 8.3 kJ/mol; Δ S ≠ sm,0.1 m M = −83 J/mol K; Δ S ≠ sm,2 m M = −117 J/mol K; Δ H ≠ pt,0.4 m M = 12.5 kJ/mol; Δ H ≠ pt,2 m M = 12.5 kJ/mol; Δ S ≠ pt,0.4 m M = −92 J/mol K; Δ S ≠ pt,2 m M = −100 J/mol K. The similarity between Δ H ≠ pt,0.4 m M , Δ H ≠ pt,2 m M and Δ H ≠ sm,0.1 m M , and between Δ S ≠ pt,0.4 m M , Δ S ≠ pt,2 m M and Δ S ≠ sm,0.1 m M correlate with the earlier finding that adsorption of HQ onto roughened Pt surfaces occurred primarily in the flat orientation at all concentrations studied." @default.
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- W1514383756 date "1987-01-01" @default.
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- W1514383756 title "Kinetics of hydroquinone chemisorption at polycrystalline platinum electrodes" @default.
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- W1514383756 doi "https://doi.org/10.1016/0022-0728(87)85069-6" @default.
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