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science 1218 氮参杂介孔碳用于电化学能量贮存超级电容器
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Nitrogen-doped mesoporous carbon of extraordinary capacitance for electrochemical energy storage Tianquan Lin,1,2 I-Wei Chen,3 Fengxin Liu,1 Chongyin Yang,1 Hui Bi,1 Fangfang Xu,1 Fuqiang Huang1,2* 中科院上海硅酸盐所联合北京大学、美国宾夕法尼亚大学展开持续攻关。黄富强研究团队最终发现，石墨烯是超级电容器电极的最佳选择。研制出一种高性能超级电容器电极材料——氮掺杂有序介孔石墨烯。该材料具有极佳的电化学储能特性，可用作电动车的“超强电池”：充电只需7秒钟，即可续航35公里。 Carbon-based supercapacitors can provide high electrical power, but they do not have sufficient energy density to directly compete with batteries.We found that a nitrogen-doped ordered mesoporous few-layer carbon has a capacitance of 855 farads per gram in aqueous electrolytes and can be bipolarly charged or discharged at a fast, carbon-like speed. The improvement mostly stems from robust redox reactions at nitrogen-associated defects that transform inert graphene-like layered carbon into an electrochemically active substance without affecting its electric conductivity. These bipolar aqueous-electrolyte electrochemical cells offer power densities and lifetimes similar to those of carbon-based supercapacitors and can store a specific energy of 41 watt-hours per kilogram (19.5 watt-hours per liter).  1.jpg  2.jpg |
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2015-12-19 21:27:04, 1.04 M
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