High-performance supercapacitors and batteries derived from activated banana-peel with porous structures
High-performance supercapacitors and batteries derived from activated banana-peel with porous structures
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DOI：
10.1016/j.electacta.2016.11.099
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发表时间：
2016-12
影响因子：
6.6
通讯作者：
Yunya Zhang;Zan Gao;Ningning Song;Xiaodong Li
中科院分区：
文献类型：
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作者：
Yunya Zhang;Zan Gao;Ningning Song;Xiaodong Li
从不可再生和不可持续的石墨和化石燃料中提取的碳质材料已被广泛用于制造超级电容器和电池电极，但开采和制造过程往往是危险和污染的。因此，从可再生生物物质中提取活性碳具有重要的环境意义和社会意义。这里提出了一种独特的创新解决方案，以香蕉皮为原料生产超级电容器和电池。香蕉皮是最丰富和最容易获得的生物废物之一，它自然地处理层次化的多孔结构，使活性香蕉皮(ABP)成为负载电活性纳米材料的理想骨架。ABP衍生的不对称超级电容器表现出优异的倍率容量和循环能力，以及能量密度和功率密度的协同提高，这是因为相互连接的多孔结构刺激了海胆状NiCo2O4颗粒的形成，防止了NiCo2O4纳米线的聚集，并提高了电解液的可及性。通过对Ni(NO3)2溶液处理的ABP进行热处理，得到了具有独特的Ni/石墨烯核/壳纳米颗粒的有序排列的纳米孔。由总部基地/镍/石墨烯杂化材料制成的锂硫(Li-S)电池在比容(1260.3 mAhg−1，0.2C)、倍率能力和循环稳定性方面具有极高的电化学性能。
Carbonaceous materials derived from non-renewable and non-sustainable graphite and fossil fuels have been widely used in building supercapacitor and battery electrodes but the mining and fabrication processes are often hazardous and contaminative. Therefore, to derive activated carbon from renewable bio-mass materials is environmentally and socially significant. Here a unique and innovative solution is proposed to produce supercapacitors and batteries from banana peels. Banana peel, which is one of the most abundant and accessible bio-wastes, naturally processes hierarchically porous structure, making activated banana peel (ABP) an ideal backbone for loading electroactive nanomaterials. The ABP derived asymmetric supercapacitors exhibited superior rate capacity and cyclic ability, as well as a synergetic enhancement of energy density and power density because the interconnected porous structure stimulated the formation of urchin-like NiCo2O4particles, prevented the aggregation of NiCo2O4nanowires, and enhanced the electrolyte accessibility. Orderly arranged nanopores with unique Ni/graphene core/shell nanoparticles were created by annealing the Ni(NO3)2solution-treated ABP. The lithium-sulfur (Li-S) batteries built by the ABP/Ni/graphene hybrid achieved exceptionally high electrochemical properties in terms of specific capacitance (1260.3 mAh g−1at 0.2C), rate capability, and cycling robustness.