【摘要】 催化剂具有降低反应活化能、加快反应速率等特点。催化化学是物理化学领域的一个重要分支。催化剂的作用原理是催化化学知识体系的基础。为了具象理解该原理，设计了“碘化钾催化下的L-半胱氨酸氧化反应”。该实验通过温度、催化剂2个变量验证了催化剂的作用；通过变色反应检测中间物，理解催化剂改变了反应历程；用原电池电动势测定方法验证了催化剂不改变反应的平衡常数和吉布斯自由能的热力学特性。通过设计创新实验将催化剂作用原理展现得淋漓尽致。该实验将动力学、催化化学和电化学的知识融会贯通，巩固了学生的理论知识水平，锻炼了学生运用知识的能力。设计非金属氧化还原反应电池电动势测定装置，激发了学生的创新能力。更多还原

【Abstract】 The catalyst has the characteristics of reducing the activation energy of the reaction and accelerating the reaction rate. Catalysis chemistry is an important branch in the field of physical chemistry. Catalysis action principles are the basis of catalysis chemistry knowledge. The L-cysteine oxidation reaction experiment under the catalysis of KI was designed for students’ understanding concretely the principles. The effect of the catalyst was verified by the two variables of temperature and catalyst; the intermediate species was detected with a chameleon reaction, understanding how catalyst alter reaction pathways; it was validated that the catalyst do not alter the thermodynamics properties of equilibrium constant and Gibbs free energy of the reaction by means of the primary battery electromotive force(EMF) measurement. Through this experiment, the principle of catalyst action is demonstrated vividly. The knowledge of kinetics, catalytic chemistry, and electrochemistry will be integrated to consolidate students’ theoretical knowledge and exercise using their knowledge ability in the experiment. The measurement device of electromotive force for a non-metal redox reaction battery was designed, which stimulated the students’ innovation ability.更多还原