The Pt(100) single-crystal electrode shows four voltammetric features in acid electrolytes, but the precise corresponding surface phenomena remain unresolved. Herein, a deconvolution of the classical “hydrogen region” from the “hydroxyl and anion region” is attempted by the comparison of voltammetric behavior of Pt(100) and G_MLPt(100) electrodes. A systematic study performed on Pt(s)-[n(100) × (111)] and Pt(s)-[n(100) × (110)] electrodes reveals that the feature at E_PI = 0.30 V_RHE corresponds to pure hydrogen adsorption taking place at (111) step sites vicinal to (100) domains, while the peak at E_PII = 0.36 V_RHE actually involves hydroxyl replacing hydrogen at (100) domains. An analysis examined for H₂SO₄, HClO₄, CH₃SO₃H, and HF demonstrates that the specific (H)SO₄^– adsorption commences at E_PIII = 0.40 V_RHE and effectively suppresses the formation of hydroxyl at the (100) terrace at higher potentials 0.40 < E_PIV < 0.75 V_RHE. Non-specifically adsorbing anions (ClO₄⁻, CH₃SO₃⁻ and F⁻) would only interact with the hydroxyl phase formed on the Pt(100) terrace in both potential regions.

中文翻译：

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Pt(100) 单晶电极伏安特性的反卷积

Pt(100)单晶电极在酸性电解质中表现出四种伏安特征，但精确对应的表面现象仍未解决。在此，通过比较 Pt(100) 和 G _ML Pt(100) 电极的伏安行为，尝试将经典的“氢区域”与“羟基和阴离子区域”反卷积。对 Pt(s)-[ n (100) × (111)] 和 Pt(s)-[ n (100) × (110)] 电极进行的系统研究表明， E _PI = 0.30 V _RHE时的特征对应于纯氢吸附发生在 (100) 域附近的 (111) 阶跃位点，而E _PII = 0.36 V _RHE处的峰实际上涉及羟基取代 (100) 域处的氢。对 H ₂ SO ₄、HClO ₄、CH ₃ SO ₃ H 和 HF的分析表明，特定的 (H)SO ₄ ^–吸附在E _PIII = 0.40 V _RHE时开始，并有效抑制在 (100 ) 平台处于较高电势 0.40 < E _PIV < 0.75 V _RHE。非特异性吸附阴离子（ClO ₄ ^-、CH ₃ SO ₃ ^-和 F ^-）只会与两个电位区域中 Pt(100) 平台上形成的羟基相相互作用。