空心海胆状二氧化锰的制备及其在超级电容器中的应用

Synthesis of Hollow Urchin-Like MnO_2 via a Facile Hydrothermal Method and Its Application in Supercapacitors

采用简单的一步水热法制备了空心海胆状二氧化锰,无需任何模板剂和表面活性剂。该材料具有3D的纳米结构,结构稳定,并由单个的二氧化锰空心管自组装而成。该纳米材料的特殊结构为其提供了高的比电容。在1mol·L-1硫酸钠电解液中,扫速为1mV·s-1的条件下,该材料的比电容值为254.6F·g-1。在电流密度为1.0A·g-1的条件下,充放电循环1000次后比电容值仍保持为初始值的97.5%。表明该材料具有良好的电容性能和稳定性,其具备用作高性能超级电容器的电极材料的潜能。

In this study, we described a simple hydrothermal method to synthesize hollow urchin-like manganese dioxide without any template and surfactant. 3D Hollow urchin-like manganese dioxide was consisted of single manganese dioxide tube with stable structure. Its unique structure is beneficial to improve the specific capacitance.The specific capacity is 254.6 F·g^-1in 1 mol·L^-1Na2SO4 electrolyte at a scan rate of 1 m V·s^-1. Over 97.5% of the first cycle capacitance was retained after repeating the galvanostatic charge-discharge for 1 000 cycles. This nanomaterial could be used to supercapacitor which exhibited excellent stability and capacitive properties,indicating its potential application to act as a promising electrode material for supercapacitors.