Converting biomass waste into microporous carbon with simultaneously high surface area and carbon purity as advanced electrochemical energy storage materials
Converting biomass waste into microporous carbon with simultaneously high surface area and carbon purity as advanced electrochemical energy storage materials
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将生物质废物转化为同时具有高表面积和碳纯度的微孔碳，作为先进的电化学储能材料
DOI：
10.1016/j.apsusc.2017.12.067
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发表时间：
2018-04
影响因子：
6.7
通讯作者：
Guangbo Zhao
中科院分区：
文献类型：
--
作者：
Fei Sun;Lijie Wang;Yiting Peng;Jihui Gao;Xinxin Pi;Zhibin Qu;Guangbo Zhao
开发具有高可接近表面积和高结构稳定性的碳材料是提高所构建的电化学电极和器件性能的理想选择。在此，我们报道了一种基于简单的高温化学活化程序从生物质废物中提取的新型微孔碳（MPC）。优化后的MPC-900具有微孔结构、高比表面积、部分石墨化结构和特别低的杂质含量，这是增强碳基电化学过程的关键特征。所构建的MPC-900对称超级电容器在商用有机电解质中表现出高性能，如电压窗宽至3v，从而具有高能量/功率密度（50.95 Wh kg - 1at 0.44 kW kg - 1; 25.3 Wh kg - 1at 21.5 kW kg - 1）。此外，采用简单的熔体浸润法将sno2纳米晶体包裹在MPC-900的碳基体上，作为高性能锂存储材料。获得的SnO2-MPC复合材料具有超细sno2纳米晶体，具有高容量（在0.2 A g−1时1115 mAh g−1；在10 A g−1时402 mAh g−1）和超过2000次的高倍率循环寿命。本工作不仅开发了高碳纯度、高表面积的微孔碳，而且为电化学活性材料的组合提供了一个通用平台。
Developing carbon materials featuring both high accessible surface area and high structure stability are desirable to boost the performance of constructed electrochemical electrodes and devices. Herein, we report a new type of microporous carbon (MPC) derived from biomass waste based on a simple high-temperature chemical activation procedure. The optimized MPC-900 possesses microporous structure, high surface area, partially graphitic structure, and particularly low impurity content, which are critical features for enhancing carbon-based electrochemical process. The constructed MPC-900 symmetric supercapacitor exhibits high performances in commercial organic electrolyte such as widened voltage window up to 3 V and thereby high energy/power densities (50.95 Wh kg−1at 0.44 kW kg−1; 25.3 Wh kg−1at 21.5 kW kg−1). Furthermore, a simple melt infiltration method has been employed to enclose SnO2nanocrystals onto the carbon matrix of MPC-900 as a high-performance lithium storage material. The obtained SnO2-MPC composite with ultrafine SnO2nanocrystals delivers high capacities (1115 mAh g−1at 0.2 A g−1; 402 mAh g−1at 10 A g−1) and high-rate cycling lifespan of over 2000 cycles. This work not only develops a microporous carbon with high carbon purity and high surface area, but also provides a general platform for combining electrochemically active materials.
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