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电化学(中英文) ›› 1997, Vol. 3 ›› Issue (1): 15-20. 

• 研究论文 • 上一篇    下一篇

交流电化学热法测定电极反应熵变

董良俊,庄继华,江志裕   

  1. 复旦大学化学系
  • 收稿日期:1997-02-28 修回日期:1997-02-28 出版日期:1997-02-28 发布日期:1997-02-28

Ac Electrochemical thermal method for investigating the entropy change of electrochemical reaction

Dong Liangjun Zhuang Jihua Jiang Zhiyu    

  1. (Dept. of Chem. Fudan Univ., Shanghai 200433
  • Received:1997-02-28 Revised:1997-02-28 Published:1997-02-28 Online:1997-02-28

摘要: 交流电化学热法测定电极反应熵变①董良俊庄继华江志裕*(复旦大学化学系上海200433)电极反应的熵变是电极过程的重要物理化学参数之一.测定电极反应的熵变不仅有助于分析电极反应,而且由于熵变与电极反应时的温度变化密切相关,对于一些实际体系,如化学电源、...

Abstract: An ac electrochemical thermal method was developed for measuring the entropy change of the electrochemical reaction. When an ac current i 0 cos ωt passed through an electrode in the solution, the heat produced at the surface consisted of several parts. The part varied with frequency ω was caused by the entropy change of the electrochemical reaction, so called the Peltier heat. It could be measured by using a pyroelectric PVDF film detector with a lock in amplifier. This method presents the advantage to inhibit the influence of the polarization heat and Joule heat. The entropy changes of electrochemical reactions in the Fe 2+ /Fe 3+ and Cu/Cu 2+ systems were measured by this method, and some mechanisms were discussed.

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