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/MnO2 electrode materials exhibited high specific capacitance of 212.0F/g at the current density of 0.5A/g,which was 1.5 times than the RHC under the same conditions.At the same time,it exhibited great rate capability and superior cyclability after 3000 charge/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.
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基金资助
福建省自然科学基金项目(2019J01829);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);福建省自然科学基金项目(2019J01830);重点实验室开放基金项目(WYKF2018-13)
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