Yao Yuechao, Zhang Qi, Liu Peng, Yu Liang, Huang Lin, Zeng Shao-Zhong, Liu Lijia, Zeng Xierong, Zou Jizhao
Shenzhen Key Laboratory of Special Functional Materials, Shenzhen Engineering Laboratory for Advance Technology of Ceramics, College of Materials Science and Engineering, Shenzhen University Shenzhen 518060 P. R. China
School of Aerospace, Transport and Manufacturing, Cranfield University Cranfield Bedfordshire MK43 0AL UK.
RSC Adv. 2018 Jan 9;8(4):1857-1865. doi: 10.1039/c7ra12525a. eCollection 2018 Jan 5.
It is critical for nanoporous carbons to have a large surface area, and low cost and be readily available for challenging energy and environmental issues. The pursuit of all three characteristics, particularly large surface area, is a formidable challenge because traditional methods to produce porous carbon materials with a high surface area are complicated and expensive, frequently resulting in pollution (commonly from the activation process). Here we report a facile method to synthesize nanoporous carbon materials with a high surface area of up to 1234 m g and an average pore diameter of 0.88 nm through a simple carbonization procedure with carefully selected carbon precursors (biomass material) and carbonization conditions. It is the high surface area that leads to a high capacitance (up to 213 F g at 0.1 A g) and a stable cycle performance (6.6% loss over 12 000 cycles) as shown in a three-electrode cell. Furthermore, the high capacitance (107 F g at 0.1 A g) can be obtained in a supercapacitor device. This facile approach may open a door for the preparation of high surface area porous carbons for energy storage.
对于纳米多孔碳来说，具备大表面积、低成本且易于获取以应对具有挑战性的能源和环境问题至关重要。要同时具备这三个特性，尤其是大表面积，是一项艰巨的挑战，因为传统制备高表面积多孔碳材料的方法复杂且昂贵，还常常会造成污染（通常来自活化过程）。在此，我们报告一种简便方法，通过使用精心挑选的碳前驱体（生物质材料）并控制碳化条件，经简单碳化过程合成出表面积高达1234 m²/g且平均孔径为0.88 nm的纳米多孔碳材料。如在三电极电池中所示，正是高表面积导致了高电容（在0.1 A/g时高达213 F/g）和稳定的循环性能（在12000次循环中损失6.6%）。此外，在超级电容器器件中也能获得高电容（在0.1 A/g时为107 F/g）。这种简便方法可能为制备用于能量存储的高表面积多孔碳打开一扇门。
