Synthesis of three dimensional N&S co-doped rGO foam with high capacity and long cycling stability for supercapacitors
Synthesis of three dimensional N&S co-doped rGO foam with high capacity and long cycling stability for supercapacitors
复制标题
三维N的合成
DOI：
10.1016/j.jcis.2018.11.007
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发表时间：
2019
影响因子：
9.9
通讯作者：
He Chun
中科院分区：
文献类型：
--
作者：
Hao Junnan;Meng Tao;Shu Dong;Song Xiaona;Cheng Honghong;Li Bo;Zhou Xiaoping;Zhang Fan;Li Zhibo;He Chun
受蒸面包的启发，以（NH 4）2S 2 O3为发泡剂、氮源和硫源，采用类似蒸面包的气体发泡法制备了一种新型三维氮硫共掺杂还原氧化石墨烯（3D NS-rGO）泡沫材料。这种交联的3D结构不仅具有高的比表面积，还能够实现更多的电子/离子传输通道。此外，引入含N和S的官能团会在石墨烯中产生晶格缺陷，从而提供更多发生法拉第赝电容的活性位点。因此，在三电极系统中的3D NS-rGO样品的电化学测试表明，在1 A g-1下具有306.3 F g-1的高比容量，是在相同温度下制备的rGO的两倍。此外，3D NS-rGO样品显示出极好的循环稳定性，在10，000次循环后电容损失小于2%，并且它显示出高性能超级电容器的潜在应用。
Inspired by steaming bread, a novel three dimensional N and S co-doped reduced graphene oxide (3D NS-rGO) foam is fabricated via a gas foaming method similar to steaming bread procedure, in which (NH4)2S2O3is selected as the foaming agent as well as N and S source. Such cross-linked 3D structure not only has the high specific surface area also enable more transport channels for electrons/ions transport. Furthermore, introducing of N and S-containing functional groups creates lattice defects in graphene, which provides more active sites where the Faradaic pseudocapacitance occurs. Consequently, the electrochemical test of 3D NS-rGO sample in a three-electrode system demonstrates a high specific capacity of 306.3 F g−1at 1 A g−1, two times higher than that of rGO prepared at the same temperature. Moreover, 3D NS-rGO sample reveals the superb cycling stability with less than 2% capacitance loss after 10,000 cycles and it exhibits potential application for high performance supercapacitors.