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From wood to thin porous carbon membrane: Ancient materials for modern ultrafast electrochemical capacitors in alternating current line filtering
Energy Storage Materials ( IF 20.4 ) Pub Date : 2020-11-07 , DOI: 10.1016/j.ensm.2020.11.007
Miao Zhang , Wei Wang , Liangxiao Tan , Mirva Eriksson , Mingmao Wu , Hongyun Ma , Hong Wang , Liangti Qu , Jiayin Yuan

Ultrafast electrochemical capacitors with alternating current line filtering function have attracted growing attention owing to their potential to replace the state-of-the-art bulky aluminum electrolyte capacitors. In spite of rapid advance recently involving nanomaterials as electrode building units, it remains largely unexplored how to structurally and chemically engineer electrodes out of renewable resource with competitive or better rate performance. Herein, wood as a renewable resource was used to fabricate highly conductive, robust, porous thin carbon membranes as free-standing electrodes for ultrafast electrochemical capacitors. Transformation of wood slice to carbon membrane proceeds via wet-chemical treatment of wood slices and subsequent morphology-maintaining carbonization by spark plasma sintering. Judiciously combining high conductivity, characteristic porous architecture with low tortuosity and high continuity, and the ultrathin thickness down to 20 μm, the carbon membrane-based electrochemical capacitor exhibits excellent frequency response with efficient 120 Hz filtering (phase angle = −83.5o). Compared to the latest electrodes for line filtering application that are fabricated from carbon nanotubes, graphene, and MXene, the wood-derived carbon membranes possess a competitive specific areal capacitance of up to 509.7 µF cm−2, and extremely low resistance-capacitance constant of 164.7 µs, plus the inexpensive scalable fabrication strategy.



中文翻译:

从木材到薄薄的多孔碳膜:用于交流线路滤波的现代超快电化学电容器的古老材料

具有交流线路滤波功能的超快电化学电容器因其有潜力替代最先进的笨重的铝电解质电容器而受到越来越多的关注。尽管近来涉及纳米材料作为电极构建单元的飞速发展,但如何在结构上和化学上用具有竞争性或更好的速率性能的可再生资源制造电极仍是未知的。在本文中,使用木材作为可再生资源来制造高导电,坚固,多孔的薄碳膜,作为超快电化学电容器的自立式电极。木片向碳膜的转化通过湿法化学处理木片,随后通过火花等离子体烧结进行形态保持碳化。明智地结合了高电导率,低曲折度和高连续性的特征性多孔结构以及低至20μm的超薄厚度,基于碳膜的电化学电容器具有出色的频率响应和有效的120 Hz滤波(相角= -83.5 o)。与由碳纳米管,石墨烯和MXene制成的最新的线过滤电极相比,源自木材的碳膜具有高达509.7 µF cm -2的竞争比表面积电容,并且具有极低的电阻电容常数。 164.7 µs,加上廉价的可扩展制造策略。

更新日期:2020-11-27
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