纳米MnO2超级电容器.docVIP

纳米MnO2超级电容器 Nano-MnO2 super electrochemical capacitor 摘 要 超级电容器是一种新型高功率储能器件，相比电池，具有更大的功率密度值；相比传统的静电电容器，具有更高的能量密度；同时具有瞬间释放特大电流特性，充放电效率高、循环寿命长等特点。根据储能原理，电化学超级电容器分为双电层电容器和法拉第赝电容器。目前，对超级电容器的研究，主要集中在电极材料方面。 超级电容器是一种介于常规电容器与化学电池二者之间的一种新型储能元件,它具有很高的放电功率、法拉级别的超大电容量、较高的能量、较宽的工作温度范围和极长的使用寿命、免维护、经济环保等优点。本文介绍了超级电容器的原理、发展状况及特点。归纳了超级电容器应用研究状况,并指出使用中应注意的事项及解决方法。 本次试验以MnSO4 和 KMnO4 为原料，采用水热合成法制得MnO2 并制成电化学电容器电极；采用恒流充放电、循环伏安、交流阻抗等方法对 MnO2电容器的电化学性能进行表征。 柠檬酸、 葡萄糖 、尿素在合成纳米MnO2材料时的加入被用来研究对纳米MnO2材料的比容量是否有帮助。 关键词：超级电容器；原理；纳米MnO2材料；水热合成法 Nano-MnO2 electrochemical supercapacitor Abstract Supercapacitors are new energy storage devices with high power density. Compared with batteries, it has the power density of greater value. Compared with traditional static capacitor, it also has a higher energy density; at the same time with the release of large transient current characteristics, charge-discharge efficiency, and long cycle life characteristics. According to the principle of energy- storage, there are two types of capacitors: electric double-layer capacitor and faradaic pseudo-capacitor. Nowadays，studies on supercapacitors are mainly focused on the preparation of high performance electrode material. As a new kind of energy storage devices, supercapacitors has large discharge power, large capacitance as farad grade, higher energy, wider operating temperature range, longer service life, free2 maintenance, economical and environmental protection, which is between common capacitor and chemical batteries. This paper includes supercapacitors’ principle, main performance index, development status and characteristics, and sums up supercapacit ors’ research status . At last, it points out attention in use and resolvent . Using MnSO4 and KMnO4 as reactants, MnO2 was synthesized by hydrothermal method. Galvanostastic charge-discharge, A.C. impendence, cyclic voltammetry were used to study the electrochemical performance of the as-prepared electrochemical capacitor. Citric acid、amylaceum and