摘要：以MnSO₄·H₂O和KMnO₄为原料, 去离子水为溶剂, 采用液相沉淀法, 在集束式对流微通道反应器中合成超细球形MnO₂颗粒;采用扫描电子显微镜 (SEM) 、X射线衍射仪 (XRD) 、热重-差热分析仪 (TGA-DTA) 、电化学工作站对MnO₂颗粒进行分析表征, 研究工艺条件对MnO₂颗粒尺寸以及电化学性能的影响。结果表明:通过控制操作条件, 在集束式对流微通道反应器中可以得到形貌与性能良好的MnO₂颗粒;在陈化2 h、220℃煅烧工艺条件下, 得到MnO₂的比电容为175 F/g左右, 循环充放电500次后性能下降约10%。

关键词：微反应器；液相沉淀；二氧化锰；比电容

Abstract：Ultrafine spherical MnO₂particles were prepared via the liquid deposition method in a clustered countercurrent flow micro-channel reactor (C-CFMCR) , in which two streams of Mn SO₄and KMnO₄aqueous solutions reacted with each other.Scanning electron microscopy (SEM) , X-ray diffraction (XRD) , thermogravimetric and differential thermal analysis (TGA-DTA) and electrochemical workstation were used to characterize the samples.The influence of preparation conditions on particle morphologies and electrochemical properties were investigated.The results indicate that MnO₂with fine morphology and propertiesisobtainedunderoptimized operating conditions in C-CFMCR.With aging time of 2 h and calcination for 2 h at 220℃, MnO₂particles with a specific capacitance (SC) of about 175 F/g are synthesized.After 500 cycles of galvanostatic charge and discharge, the capacitance loss is about 10%.

Keywords：microreactor；liquid deposition；manganese dioxide；specific capacitance