As one of the most promising energy-storage devices, supercapacitors have drawn great research interests because of their outstanding electrochemical behavior. Carbon paper holds great prospect as an electrode material for supercapacitors since it is inexpensive and highly conductive. In this paper, the modified Hummer's method is employed as an effective strategy to produce activated carbon paper with rougher surfaces and increased specific surface areas. It is further observed that hydrophilic groups such as hydroxyl (-OH), carbonyl (> C=O), and carboxyl (-COOH) have been introduced into the surface of carbon paper over treatment and they serve as strong polar sites to absorb water molecules, leading to improved hydrophilicity. Thus, the as-treated carbon papers with both increased specific surface areas and improved surface hydrophilicity exhibited excellent capacitive characteristics. Moreover, the charge/discharge test over 2000 cycles shows their excellent long-term capacitive retention.
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机译：作为最有前途的储能设备之一，超级电容器由于其出色的电化学性能而引起了极大的研究兴趣。由于碳纸价格低廉且具有高导电性，因此作为超级电容器的电极材料具有广阔的前景。在本文中，改良的悍马方法被用作生产具有更粗糙表面和增加比表面积的活性炭纸的有效策略。进一步观察到，经过处理已将亲水性基团（例如羟基（-OH），羰基（> C = O）和羧基（-COOH））引入了碳纸表面，它们充当了吸收水的强极性位点分子，从而提高了亲水性。因此，既具有增加的比表面积又具有改善的表面亲水性的经处理的碳纸表现出优异的电容特性。此外，经过2000次循环的充电/放电测试显示出其出色的长期电容保持率。
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