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首页> 外文期刊>RSC Advances >Capacitive performance of porous carbon nanosheets derived from biomass cornstalk
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Capacitive performance of porous carbon nanosheets derived from biomass cornstalk

机译：源自生物质玉米秸秆的多孔碳纳米片的电容性能

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摘要

Porous carbon nanosheets (aCS) formed by carbonization and chemical activation of biomass cornstalk are presented for capacitive energy storage. The obtained carbon possesses a two-dimensional (2D) sheet-like structure which is mainly composed of abundant micropores. Depending on the amount of KOH used in the activation step, the specific surface area of the carbon sheets varies from 388 to 1736 m2 g?1, whereas the lateral size is in the range of 50–100 μm, and sheet thickness is around 100 nm. The capacitive performance of aCS-5 in both KOH and Na2SO4 aqueous electrolytes is investigated. The aCS-5 electrode in KOH electrolyte exhibits a remarkable high-rate capability due to the dramatically shortened ion pathway and more exposed external surface. While, in Na2SO4 it shows relatively lower capacitance retention but a stable and extended voltage window (0–1.6 V), thus delivering a specific energy of 20.2 W h kg?1 at a power density of 398 W kg?1. The aCS-5 with a large aspect ratio (200–500) can also serve as an electrode for assembling a solid-state capacitor (SSC) using PVA/KOH gel as a polymer electrolyte. The SSC retains the normal capacitive performance under bent and twisted states and exhibit an unusual rate capability with an areal capacitance of 136 mF cm?2 at 0.5 mA cm?2.
机译：提出了通过生物质玉米秸秆的碳化和化学活化形成的多孔碳纳米片（aCS），用于电容性能量存储。所获得的碳具有二维（2D）片状结构，其主要由丰富的微孔组成。取决于活化步骤中使用的KOH量，碳片的比表面积从388到1736 m 2 g ？1 ，而横向尺寸在50–100μm的范围内，并且片材厚度约为100 nm。研究了aCS-5在KOH和Na 2 SO 4 水溶液中的电容性能。 KOH电解质中的aCS-5电极由于显着缩短了离子通道并暴露了更多的外表面，因此具有显着的高倍率性能。而在Na 2 SO 4 中，它显示出相对较低的电容保持率，但电压范围稳定且扩展（0 –1.6 V），从而以398 W kg ？1 ？1 的比能量> 。高纵横比（200–500）的aCS-5还可以用作使用PVA / KOH凝胶作为聚合物电解质来组装固态电容器（SSC）的电极。 SSC在弯曲和扭曲状态下仍能保持正常的电容性能，并在0.5 mA cm <的情况下具有136 mF cm ？2 的面积电容，显示出异常的速率能力sup>？2 。

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