Abstract The interfacial properties of platinum single crystal electrodes in contact with alkaline aqueous solutions (pH = 13) have been investigated using the laser induced temperature jump method. This technique offers insights into the net orientation of water dipoles in contact with the electrode surface by recording the coulostatic potential changes after a sudden increase of the interfacial temperature in the submicrosecond time scale. This information is intimately related with the magnitude and sign of charge separation at the interphase and the resulting electric field. In all cases, water shows a net orientation with the hydrogen towards the metal at the lowest investigated potential value, reflected in negative potential transients. The magnitude of the water orientation decreases as the applied potential increases. Eventually, the sign of the potential transient changes, reflecting a reorientation of the water dipoles. The potential where such inversion takes place follows the order Pt(110)

中文翻译：

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从激光诱导温度跳跃法对 Pt(hkl)-碱性溶液界面相的新见解

摘要 使用激光诱导温度跳跃法研究了铂单晶电极与碱性水溶液（pH = 13）接触时的界面特性。该技术通过在亚微秒时间尺度内记录界面温度突然升高后的库仑电位变化，提供了对与电极表面接触的水偶极子的净取向的深入了解。该信息与相间电荷分离的幅度和符号以及由此产生的电场密切相关。在所有情况下，水在最低调查电位值下显示出氢朝向金属的净取向，反映在负电位瞬变中。随着施加电位的增加，水取向的幅度减小。最终，潜在瞬态变化的迹象，反映了水偶极子的重新定向。发生这种反转的可能性遵循 Pt(110) 顺序