An improved sensor for electrochemical microcalorimetry, based on lithiumtantalate
An improved sensor for electrochemical microcalorimetry, based on lithiumtantalate
复制标题
DOI：
10.1063/1.4922859
复制
发表时间：
2015-06-01
影响因子：
1.6
通讯作者：
Schuster, Rolf
中科院分区：
文献类型：
--
作者：
Frittmann, Stefan;Halka, Vadym;Schuster, Rolf
我们已经开发了一种热释电传感器的电化学微量热法，基于钽酸锂，它提供了前所未有的灵敏度检测电化学诱导的热效应。由电极表面上的电致伸缩效应引起的热信号的劣化通过多层构造来抑制，其中中间蓝宝石片抑制机械变形。因此，纹理良好的薄金属膜成为电极的可行候选者。我们证明了铜欠电位沉积在蓝宝石上的（111）织构Au薄膜的传感器性能。传感器信号与通过用激光脉冲加热而引起的纯热信号比较好。该传感器的高灵敏度通过测量高氯酸中双层充电时的热效应来证明，即，在没有电化学电荷或离子转移反应的情况下。(C)2015 AIP Publishing LLC.
We have developed a pyroelectric sensor for electrochemical microcalorimetry, based on LiTaO3, which provides unprecedented sensitivity for the detection of electrochemically induced heat effects. Deterioration of the heat signal by electrostriction effects on the electrode surface is suppressed by a multilayered construction, where an intermediate sapphire sheet dampens mechanical deformations. Thus, well textured thin metal films become viable candidates as electrodes. We demonstrate the sensor performance for Cu underpotential deposition on (111)-textured Au films on sapphire. The sensor signal compares well with a purely thermal signal induced by heating with laser pulses. The high sensitivity of the sensor is demonstrated by measuring heat effects upon double layer charging in perchloric acid, i.e., in the absence of electrochemical charge-or ion-transfer reactions. (C) 2015 AIP Publishing LLC.