Sun Yu-An, Chen Li-Ting, Hsu Sheng-Yaw, Hu Chi-Chang, Tsai De-Hao
Department of Chemical Engineering , National Tsing-Hua University , Hsinchu 30013 , Taiwan , R.O.C.
Langmuir. 2019 Nov 5;35(44):14203-14212. doi: 10.1021/acs.langmuir.9b02409. Epub 2019 Oct 22.
A facile aerosol-based synthetic approach is demonstrated for the fabrication of silver-manganese oxide (Ag-MnO) and cetyltrimethylammonium bromide (CTAB)-templated silver-manganese oxide (c-Ag-MnO) hybrid nanostructures as the positive electrode materials of supercapacitors. Through gas-phase evaporation-induced self-assembly, silver nanoparticles are homogeneously decorated in the hybrid nanostructure to create a conductive path at the interface of the cluster of MnO crystallites. The utilization of the capacitance of MnO increases by the addition of Ag nanoparticles (>2 times for Ag-MnO and ∼1.7 times for c-Ag-MnO). An optimal specific capacitance is achieved when the concentration of the silver precursor () is 0.5 wt %, 118 F g for Ag-MnO, and 154 F g for c-Ag-MnO at a specific current of 1 A g. The enhanced supercapacitive performance by the addition of CTAB at low is attributed to the increased surface area (>19.4%) for electrochemical reactions. The prototype method with mechanistic understanding demonstrated in this study shows promise for the fabrication of a variety of MnO-based hybrid nanostructures for supercapacitor applications.
本文展示了一种简便的基于气溶胶的合成方法，用于制备银 - 氧化锰（Ag - MnO）和十六烷基三甲基溴化铵（CTAB）模板化的银 - 氧化锰（c - Ag - MnO）混合纳米结构，作为超级电容器的正极材料。通过气相蒸发诱导自组装，银纳米颗粒均匀地装饰在混合纳米结构中，在MnO微晶簇的界面处形成导电路径。通过添加银纳米颗粒，MnO的电容利用率提高（Ag - MnO提高超过2倍，c - Ag - MnO提高约1.7倍）。当银前驱体（）的浓度为0.5 wt%时，在1 A g的特定电流下，Ag - MnO的最佳比电容为118 F g，c - Ag - MnO的最佳比电容为154 F g。在低浓度下添加CTAB增强超级电容性能归因于电化学反应的表面积增加（>19.4%）。本研究中展示的具有机理理解的原型方法对于制备用于超级电容器应用的各种MnO基混合纳米结构具有前景。
