氮掺杂碳二硫化钒复合材料的赝电容性能综合实验设计

Comprehensive Experimental Design for Pseudocapacitance Performance of Vanadium Disulfide/Nitrogen-doped Carbon Matrix Nanocomposite

实验以生物质明胶为氮源和碳源,通过简单的退火方法,设计合成了具有分层多孔结构的氮掺杂多孔碳包覆二硫化钒(VS_(2)-NC)复合材料。利用X射线衍射仪、扫描/透射电镜、光电子能谱仪等测试手段进行结构表征,利用电化学工作站进行电化学性能测试。结果表明,制备的VS_(2)-NC复合材料架构稳定、比表面积大、活性位点多、有利于电荷传输和离子扩散。在10 A·g^(-1)的电流密度下,VS_(2)-NC复合材料可达到407.3 F·g^(-1)的比电容,经历5000次长循环后仍可保持86%的放电容量,展现出了优异的赝电容性能。作为综合实验,实验体系完整,内容涵盖化学、材料、物理等多门学科,涉及多种仪器使用,覆盖面广,能充分体现出学科间的交叉融合。学生可在锻炼实验操作技能的基础上,充分了解科学前沿和热点问题,拓宽学科的深度与广度,提升综合科学思维能力,培养创新意识和创新能力,理论联系实际,培养更多适应社会需要的综合型、应用型、创新型人才。

A hierarchical porous nanostructured composite composed of VS_(2)nanoparticles confined in biopolymer gelatin-derived nitrogen-doped carbon network(VS_(2)-NC)was successfully designed and synthesized via a simple annealing method.Then the structure was characterized by X-ray diffractometer,scanning/transmission electron microscope,photoelectron spectroscop and so on,and electrochemical performance was tested by electrochemical workstation.The results show that the as-prepared VS_(2)-NC composites has stable skeleton structure,large specific surface area and high active surface areas,which are favorable for charge transfer and ion diffusion.In addition,VS_(2)-NC composite manifests a large pseudocapacitance of 407.3 F·g^(-1)at 10 A·g^(-1),and delivers a capacitance retention of 86%after 5000 long-term cycles at 10 A·g^(-1),showing excellent pseudocapacitance performance.This comprehensive experiment shows a complete system and wide coverage,including chemistry,materials,physics and other disciplines,besides the use of a variety of instruments,which can fully reflect the combination of subjects.On the basis of training experimental operation skills,students can fully understand the frontiers of science and hot issues,broaden the depth and breadth of subjects,improve comprehensive scientific thinking ability,cultivate innovative consciousness and innovation ability,combine theory with practice,which are beneficial to cultivate more comprehensive,applied and innovative talents for meeting the needs of the society.