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首页> 外文期刊>RSC Advances >Cellulose-derived carbon nanofibers/graphene composite electrodes for powerful compact supercapacitors
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Cellulose-derived carbon nanofibers/graphene composite electrodes for powerful compact supercapacitors

机译：纤维素衍生的碳纳米纤维/石墨烯复合电极，用于功能强大的紧凑型超级电容器

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摘要

Herein, we demonstrate a unique supercapacitor composite electrode material that is originated from a sustainable cellulosic precursor via simultaneous one-step carbonization/reduction of cellulose/graphene oxide mats at 800 °C. The resulting freestanding material consists of mechanically stable carbon nanofibrous (CNF, fiber diameter 50–500 nm) scaffolds tightly intertwined with highly conductive reduced graphene oxide (rGO) sheets with a thickness of 1–3 nm. The material is mesoporous and has electrical conductivity of 49 S cm?1, attributed to the well-interconnected graphene layers. The electrochemical evaluation of the CNF/graphene composite electrodes in a supercapacitor device shows very promising volumetric values of capacitance, energy and power density (up to 46 F cm?3, 1.46 W h L?1 and 1.09 kW L?1, respectively). Moreover, the composite electrodes retain an impressive 97% of the initial capacitance over 4000 cycles. With these superior properties, the produced composite electrodes should be the “looked-for” components in compact supercapacitors used for increasingly popular portable electronics and hybrid vehicles.
机译：本文中，我们展示了一种独特的超级电容器复合电极材料，该材料源自可持续的纤维素前体，通过在800°C下同时一步碳化/还原纤维素/氧化石墨烯垫而得到。所得的独立材料由机械稳定的碳纳米纤维（CNF，纤维直径50-500 nm）支架与高度导电的氧化石墨烯（rGO）片紧密缠结而成，厚度为1-3 nm。该材料是介孔的，导电性为49 S cm ？1 ，这归因于良好互连的石墨烯层。超级电容器装置中CNF /石墨烯复合电极的电化学评估显示出非常有前景的电容，能量和功率密度的体积值（高达46 F cm 3 ，1.46 W h L ？1 和1.09 kW L ？1 。此外，复合电极在4000次循环中保留了令人印象深刻的97％的初始电容。凭借这些优越的性能，所生产的复合电极应成为紧凑型超级电容器中“寻找的”组件，这些超级电容器用于越来越流行的便携式电子产品和混合动力汽车。

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