Moso bamboo is regarded as a kind of biomass resource with abundant reserves in nature, and how to achieve its high-value utilization is one of the important research topics widely concerned by the academic community. In this work, hierarchical porous graphene nanosheets with wrinkled structures derived from the natural moso bamboo is obtained a compact two-step processing method including pyrolysis and chemical activation. The as-prepared ABC-950 possess a large specific surface area of 1758 m g, pore volume of 1.55 cm g, mesopores ratio of 75.5 % and high graphitization degree with I/I as low as 0.43. With these merits, as the electrode material for supercapacitor, the ABC-950 exhibits a high specific capacitance of 459.4 F g at 1 A g and an excellent rate performance of 82.3 % in 6 M KOH electrolyte. Moreover, the ABC-950 based symmetric supercapacitor shows superior specific capacitance of 112.3 F g at 0.5 A g and an attractive energy density of 15.6 Wh·kg at 250 W kg. Moreover, outstanding capacitance retention of about 102.1 % even after 30,000 charge-discharge cycles at a large current density of 10 A g. Our work offers a promising method to easily transform moso bamboo into porous graphene nanosheets for the electric energy storage.

中文翻译：

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源自毛竹的分级多孔石墨烯纳米片具有优异的超级电容器性能

毛竹被视为自然界储量丰富的生物质资源，如何实现其高值化利用是学术界广泛关注的重要研究课题之一。在这项工作中，通过包括热解和化学活化的紧凑两步加工方法获得了源自天然毛竹的具有皱纹结构的分级多孔石墨烯纳米片。所制备的ABC-950具有1758 m g-1的大比表面积、1.55 cm g-1的孔体积、75.5%的介孔率和高石墨化度，I/I低至0.43。凭借这些优点，ABC-950作为超级电容器的电极材料，在1 A g-1时表现出459.4 F g的高比电容，在6 M KOH电解液中表现出82.3%的优异倍率性能。此外，基于ABC-950的对称超级电容器在0.5 A g-1下表现出112.3 F g-1的优异比电容，在250 W kg-1下具有15.6 Wh·kg的诱人能量密度。此外，即使在10 A g的大电流密度下进行30,000次充放电循环后，电容保持率仍高达约102.1%。我们的工作提供了一种有前途的方法，可以轻松地将毛竹转化为用于电能存储的多孔石墨烯纳米片。