Xue Qian, Zhang Qiang
School of Chemistry and Chemical Engineering, Beijing Institute of Technology, 5 Zhongguancun Street, Haidian District, Beijing 100081, China.
Nanomaterials (Basel). 2019 Apr 1;9(4):503. doi: 10.3390/nano9040503.
A novel strategy, ion diffusion method controlled by ion exchange membrane combining with agar hydrogel template, was reported for the synthesis of Mn₃O₄ nanoparticles without any oxidizing agents. X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and Brunauere-Emmette-Teller (BET) isotherm were carried out to characterize the structure, morphology, pore size and distribution and specific surface area of the as-prepared nanomaterials. It is shown that the morphology and size of Mn₃O₄ nanoparticles can be controlled by the concentration of agar hydrogel. All the specific capacitances of the Mn₃O₄ samples prepared with agar hydrogel template are much higher than that of Mn₃O₄ prepared without any template agent. The Mn₃O₄ sample prepared at 1.5 g L of agar hydrogel solution exhibits a highest specific capacitance of 183.0 F g at the current density of 0.5 A g, which is increased by 293% compared with that of Mn₃O₄ synthesized without any template agent. The results indicate that the ion diffusion method controlled by ion exchange membrane combining with agar hydrogel template is a convenient and effective approach for preparing inorganic nanomaterials.
报道了一种新颖的策略，即离子交换膜控制的离子扩散法与琼脂水凝胶模板相结合，用于在无任何氧化剂的情况下合成四氧化三锰纳米颗粒。采用X射线衍射（XRD）、扫描电子显微镜（SEM）、透射电子显微镜（TEM）、X射线光电子能谱（XPS）和布鲁诺尔-埃米特-泰勒（BET）等温线对所制备纳米材料的结构、形貌、孔径及分布和比表面积进行了表征。结果表明，四氧化三锰纳米颗粒的形貌和尺寸可通过琼脂水凝胶的浓度来控制。所有用琼脂水凝胶模板制备的四氧化三锰样品的比电容都远高于无任何模板剂制备的四氧化三锰的比电容。在琼脂水凝胶溶液浓度为1.5 g/L时制备的四氧化三锰样品在电流密度为0.5 A/g时表现出最高比电容183.0 F/g，与无任何模板剂合成的四氧化三锰相比提高了293%。结果表明，离子交换膜控制的离子扩散法与琼脂水凝胶模板相结合是制备无机纳米材料的一种简便有效的方法。
