Bringing Real-World Energy-Storage Research into a Second-Year Physical-Chemistry Lab Using a MnO2-Based Supercapacitor
Bringing Real-World Energy-Storage Research into a Second-Year Physical-Chemistry Lab Using a MnO2-Based Supercapacitor
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使用基于 MnO2 的超级电容器将现实世界的能量存储研究带入第二年的物理化学实验室
DOI：
10.1021/acs.jchemed.8b00454
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发表时间：
2018
影响因子：
3
通讯作者：
H. Andreas
中科院分区：
文献类型：
--
作者：
F. Licht;Gianna Aleman Milán;H. Andreas
随着对替代能源的需求变得越来越重要，能源研究和相关行业正在迅速扩大。该实验室将当前的储能研究融入到第二年的实验室中，该实验室在教授和加强物理化学概念的同时，灌输真实世界的行业相关知识和技能。使用氧化锰电极，Na 2SO 4水电解质超级电容器系统，因为它没有空气或水敏感性，与大多数电池技术不同，因此很容易在本科实验室环境中实施。氧化锰是一种越来越受欢迎的超级电容器材料，本实验室引入了赝电容的概念，其中电流流动同时仍受能斯特方程（即，在平衡时）。学生进行现实和工业相关的电化学实验;他们电沉积锰氧化物薄膜，并使用循环伏安法进行测试。学生将氧化锰结果与非赝电容系统（即，差的超级电容器）。在这样做时，他们学习电荷存储和能量和功率的概念（以及它们的重要差异），同时加强热力学和动力学的物理化学主题，所有这些都在熟悉的电化学知识框架内（即，Nernst方程）。本实验可以在一个4小时的实验时间内完成，如果学生提供解决方案或提前一周准备，则可以在3小时内完成。学生的兴趣和参与度通过他们能够看到现实世界的应用程序和技能而提高。
As the need for alternative energy becomes increasingly important, energy research and related industries are rapidly expanding. This lab incorporates current energy-storage research into a second-year lab that instills real-world, industry-relevant knowledge and skills while teaching and reinforcing physical-chemistry concepts. A manganese oxide electrode, aqueous-Na2SO4-electrolyte supercapacitor system is used because it has no air or water sensitivity, unlike most battery technologies, so it is easy to implement in an undergraduate-lab setting. Manganese oxide is an increasingly popular supercapacitor material, and this lab introduces the concept of pseudocapacitance, in which current flows while still being governed by the Nernst equation (i.e., at equilibrium). Students conduct realistic and industrially relevant electrochemical experiments; they electrodeposit manganese oxide films and test them using cyclic voltammetry. Students compare the manganese oxide results to those from a nonpseudocapacitive system (i.e., a poor supercapacitor). In doing so, they learn the concepts of charge storage and energy and power (and their important differences), while reinforcing the physical-chemistry topics of thermodynamics and kinetics, all within a frame of familiar electrochemical knowledge (i.e., the Nernst equation). This lab can be completed in one 4 h laboratory period or in a 3 h period if the solutions are provided to the students or they prepare them a week in advance. Student interest and engagement is heightened by their being able to see the real-world applications and skills.