Fe(CN)₆^3-/Fe(CN)₆^4-)与Ag/AgNO₃体系的热电化学研究

来源期刊：中南大学学报(自然科学版)1999年第2期

论文作者：王少芬 方正 杨春明

文章页码：52 - 55

关键词：热电化学;电极过程热;电极

Key words：thermo-electrochemistry; heat effect of the electrode process; electrode process

摘    要：用差示测温技术测定了Fe(CN)₆^3-/Fe(CN)₆^4-)体系及Ag/AgNO₃体系阳极过程的热效应，实验中采用热敏电阻测定电极表面的温度变化，利用电流、电极电位、温差和极化时间等数据，运用热电化学基本方程得出电极反应的焓变值．实验结果表明，由热电化学方法决定的焓变与由相对应的离子的热力学数据计算得来的焓变 的差值为一恒定值，进一步得出298.15K下标准氢电极反应的绝对熵值为88.4 J·K ^-1·mol^-1。

Abstract: The Differential-Thermometry Technique was to be applied to the study on the heat effect of the anode process of Fe(CN)₆^3-/Fe(CN)₆^4-) and Ag/AgNO₃ systems. In this experiment, thermistor was used to measure the temperature of electrode, which represents the electrochemical heat effect of the electrode process. We have combined these data with anode current density and anode potential and the time of polarization to determine the enthalpy change of the electrode reaction by a set of thermo-electrochemical(TEC) equations for the half-cell reactions. The results indicate that the difference between the enthalpy change determined by TEC technology and the one that calculated with current thermodynamic data of ions of any half-cell reaction in electrochemical systems is a constant. The absolute entropy change of the standard hydrogen electrode reaction was determined to be 88.4 J·K ^-1·mol^-1 at 298.15 K.