摘要
采用原位化学沉淀法合成稻壳基三维分级多孔碳/二氧化锰(RHC/MnO2)复合材料,通过X射线衍射仪、扫描电子显微镜、自动物理吸附仪等对复合材料的表面官能团结构、微观形貌和氮气吸附-脱附等温线及孔径分布进行分析。结果表明:MnO2均匀地分布在稻壳基三维分级多孔碳(RHC)表面,其中RHC呈无规则蜂窝状孔洞结构,比表面积高达1024.5m2/g,含有丰富的大孔、介孔和微孔。高度多孔和导电的碳骨架可以有效地增强纳米MnO2的电化学性能。在电流密度0.5A/g条件下,RHC/MnO2复合材料的比电容达到212.0F/g,为RHC比电容的1.5倍;电流密度为5A/g时,循环3000次后复合材料比电容保持率保持在85.0%,表现出良好的倍率性能和循环性能。利用稻壳基RHC微观结构中相互连接的分层孔隙,将RHC与MnO2结合实现了纤维素资源的有效利用。
Three-dimensional(3D)hierarchical rice husk-derived porous carbon/MnO2(RHC/MnO2)composites were synthesized by in-situ chemical precipitation.The surface functional group structure,micro-morphology,nitrogen adsorption-desorption isotherm and pore size distribution of the composite were analyzed by X-ray diffractometer,scanning electron microscope and automatic physical adsorption instrument.The results shown that MnO2 was uniformly distributed on the surface of RHC,textural properties of RHC showed a random honeycomb structure with maximum BET surface area of 1024.5m2/g,which composed of macropores,mesopores and micropores.The highly porous and conductive matrix can effectively enhance the electrochemical performance of nanostructured MnO2.The RHC/MnO2electrode materials exhibited high specific capacitance of 212.0F/g at the current density of 0.5A/g,which was 1.5times than the RHC under the same conditions.At the same time,it exhibited great rate capability and superior cyclability after 3000charge/discharge cycles(85.0%capacitance retention at the current density of 5 A/g).The results demonstrated great potential of combining rice husk-derived porous carbon with MnO2,it taked advantage of the interconnected hierarchical pores that existed in porous carbon microstructure,which realized a more direct,environmentally friendly and efficient utilization way of cellulose resources.
作者
付兴平
杨为森
赵升云
胡家朋
刘瑞来
Fu Xingping;Yang Weisen;Zhao Shengyun;Hu Jiapeng;Liu Ruilai(College of Ecology and Resources Engineering,Wuyi University,Fujian Key Laboratory of Eco-Industrial Green Technology,Fujian Provincial Bamboo Engineering Technology Reserach Center,Nanping 354300)
出处
《化工新型材料》
CAS
CSCD
北大核心
2020年第6期247-251,256,共6页
New Chemical Materials
基金
福建省自然科学基金项目(2019J01829)
福建省自然科学基金项目(2019J01830)
福建省中青年教师教育科研项目(JT180552,JT180553)
大学生创新创业训练项目(201910397038)
重点实验室开放基金项目(WYKF2018-13)。
关键词
稻壳
二氧化锰
水热合成法
三维分级多孔碳
电化学性能
rice husk
MnO2
hydrothermal method
3Dhierarchical porous carbon
electrochemical performance
