Nitrogen‐Superdoped 3D Graphene Networks for High‐Performance Supercapacitors
Nitrogen‐Superdoped 3D Graphene Networks for High‐Performance Supercapacitors
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DOI：
10.1002/adma.201701677
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发表时间：
2017-09
影响因子：
29.4
通讯作者：
Weili Zhang;Chuan Xu;Chaoqun Ma;Guoxian Li;Yuzuo Wang;Kaiyu Zhang;Feng Li;Chang Liu;
中科院分区：
文献类型：
--
作者：
Weili Zhang;Chuan Xu;Chaoqun Ma;Guoxian Li;Yuzuo Wang;Kaiyu Zhang;Feng Li;Chang Liu;
设计并合成了一种高性能超级电容器用N掺杂水平高达15.8% at%的N掺杂3D石墨烯网络结构，其中具有高导电性的石墨烯泡沫作为骨架，并嵌套了N掺杂还原氧化石墨烯凝胶。该材料具有高导电性的互联三维多孔结构（3.33 S cm−1）、大表面积（583 m2 g−1）、低内阻（0.4 Ω）、良好的润湿性和大量的活性位点。由于这些特性的多重协同效应，基于该材料的超级电容器表现出非常优异的电化学行为，具有高比电容（在三电极配置下测量的碱性、酸性和中性电解质分别高达380、332和245 F g−1，在两电极配置下测量的碱性电解质分别为297 F g−1），良好的倍率能力，优异的循环稳定性（4600次循环后保持率为93.5%）。内阻低（0.4 Ω），具有合适的高能量密度，功率密度高。
An N‐superdoped 3D graphene network structure with an N‐doping level up to 15.8 at% for high‐performance supercapacitor is designed and synthesized, in which the graphene foam with high conductivity acts as skeleton and nested with N‐superdoped reduced graphene oxide arogels. This material shows a highly conductive interconnected 3D porous structure (3.33 S cm−1), large surface area (583 m2 g−1), low internal resistance (0.4 Ω), good wettability, and a great number of active sites. Because of the multiple synergistic effects of these features, the supercapacitors based on this material show a remarkably excellent electrochemical behavior with a high specific capacitance (of up to 380, 332, and 245 F g−1 in alkaline, acidic, and neutral electrolytes measured in three‐electrode configuration, respectively, 297 F g−1 in alkaline electrolytes measured in two‐electrode configuration), good rate capability, excellent cycling stability (93.5% retention after 4600 cycles), and low internal resistance (0.4 Ω), resulting in high power density with proper high energy density.