用于高性能伪电容的氧化石混合与硫聚合物
Samanta Witomska1,2,3, Zhaoyang Liu1, Włodzimierz Czepa2,3
1Université de Strasbourg , CNRS, ISIS , 8 alleé Gaspard Monge , 67000 Strasbourg , France.
Journal of the American Chemical Society
|December 6, 2018
概括
我们开发了一种新的石墨烯氧化混合物, 这种先进的材料显著提高了超级电容的性能,为储能应用提供了高的特定电容和出色的稳定性.
科学领域:
- 材料科学
- 电化学
- 纳米技术
背景情况:
- 碳基电极对于超级电容器至关重要,但提高它们的特定电容和伪电容性行为仍然是一个挑战.
- 由于其高表面积和导电性,石墨烯氧化物 (GO) 提供了一个有前途的支架,但需要功能化以提高电化学性能.
研究的目的:
- 通过对氧化还原活性尿素-甲聚合物进行共价功能化,制造出多功能混合材料.
- 研究这种混合结构对电化学伪电容性行为和超级电容器整体性能的影响.
主要方法:
- 石墨烯氧化物的共价功能化与硫尿素-甲聚合物.
- 多尺度的物理和化学特征 (例如,多孔性,表面积,元素分布).
- 电化学测试以评估特定电容,面积电容,能量密度和循环稳定性.
主要成果:
- 由此产生的3D混合体具有高孔隙性和402 m2的特定表面积.
- 硫,和氧功能组的存在促进了法拉第式氧化还原反应,增强了伪电容性.
- 基于石墨烯的混合物实现了400 F g-1的高特异电容,面积电容为160 mF cm-2和能量密度为11.1 mWh cm-3,在5000个循环后保持100%的电容.
结论:
- 石墨烯氧化物与硫氨酸甲聚合物的共价功能化成功地产生了具有优异超容性的多功能混合物.
- 由于其高容量,能量密度和卓越的循环稳定性,这种新型混合系统显示了先进的储能应用的巨大潜力.
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