以酵母为生物模板和绿色碳源,分别在900℃、1100℃和1300℃条件下对其高温热解,获得了尺寸和形貌高度均匀的碳微球。采用X射线衍射仪(XRD)、扫描电子显微镜(SEM)、氮气脱吸附仪对所得碳微球的物相组成、形貌、比表面积进行表征,并探讨了不同热解温度对其电化学性能的影响。结果表明,1100℃热解所得酵母碳材料展示出较高的可逆储钠比容量(205mAh/g,0.1C=20mA/g)和优异的循环稳定性(186mAh/g@100次)。采用生物模板法合成酵母碳微球的策略不仅可以实现生物材料绿色高效利用,同时也为钠离子电池提供了一种极具潜力的碳负极材料。
A series of carbon microspheres with uniform size and morphology were synthesized from yeasts as biotemplates and carbon sources viaa facile high-temperature pyrolysis method at 900℃,1100℃ and 1300℃,respectively.X-ray diffraction (XRD),scanning electron microscopy (SEM) and N2 adsorption/desorption tests were performed to reveal the phase composition,morphology and specific surface area of microspheres.The effects of pyrolysis temperature on the electrochemical performance of microspheres were systematically investigated.The results showed that the sample carbonized at 1100℃exhibited the high reversible capacity of 205mAh/g at 0.1C(0.1C=20mA/g) and good cycling performance(reversible capacity of 186mAh/g over 100 cycles).This biotemplating strategy could not only realize the comprehensive utilization of biomass,but also provided a high potential cathodic material for sodium-ion battery.
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基金资助
国家自然科学基金(21403196、51572240);浙江省自然科学基金(LY16E070004、LY17E020010、LY18B030008)
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