热力学方法计算5-羟甲基糠醛电氧化的可逆电池电动势

Calculationthe Revisable Electric Potential of 5-Hydroxymethyl Furfural Electro-Oxidationby Thermodynamic Data

电化学热力学建立了可逆电池电动势与相应电池反应热力学函数间的关系。电化学氧化5-羟甲基糠醛(5-HMF)制备2,5-呋喃二甲酸(FDCA)可以取代传统聚对苯二甲酸乙二醇酯(PET)路线制备生物衍生塑料,但是该反应的标准电动势和各分步反应的标准可逆电极电势尚无精确的实验数据可用。本文通过查阅文献中的热力学数据推算了该数据,确证了从热力学和动力学2个方面看HMF的电氧化反应比水的电氧化反应都优先,而且HMF的电化学氧化在强碱性溶液中更易进行。将本文内容作为综合习题引入电化学热力学教学,加深了学生对物理化学各部分之间关系的理解,提升了其综合应用物理化学知识解决实际问题的能力。

Electrochemical thermodynamics establishes the relationship between the reversible battery electric potential and the corresponding battery reaction thermodynamic function.Electrochemical oxidation of 5-hydroxymethyl furfural(5-HMF)to produce 2,5-furandicarboxylic acid(FDCA)can replace the traditional polyethylene terephthalate(PET)route for preparation of bio-derived plastics,but no accurate experimental data are available for the standard electric potential of the reaction and the standard reversible electrode potential of each step.In this paper,these data are calculated by the literature thermodynamic data.The results confirmed that the oxidation reaction of HMF occurs first than the oxidation reaction of water in terms of both thermodynamics and electrochemistry,and the electrochemical oxidation of HMF is easier to proceed in a strong alkaline solution.The obtained data can be added to the electrochemical tool books as reference.The work is introduced as a comprehensive exercise into the teaching of electrochemical thermodynamics.It helps to deepen the understanding on the relationship among various parts of physical chemistry,improves students’ability to apply physical and chemical knowledge to solve practical problems.