Carbohydrazide-dependent reductant for preparing nitrogen-doped graphene hydrogels as electrode materials in supercapacitor
Carbohydrazide-dependent reductant for preparing nitrogen-doped graphene hydrogels as electrode materials in supercapacitor
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碳酰肼依赖性还原剂制备氮掺杂石墨烯水凝胶作为超级电容器电极材料
DOI：
10.1016/j.apsusc.2016.02.009
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发表时间：
2016-04
影响因子：
6.7
通讯作者：
Zhuo Shuping
中科院分区：
文献类型：
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作者：
Jiang Man;Xing Ling Bao;Zhang Jing Li;Hou Shu Fen;Zhou Jin;Si Weijiang;Cui Hongyou;Zhuo Shuping
在氧化石墨烯(GO)水溶液中，采用强还原剂碳肼作为还原掺杂剂，设计并快速合成了三维掺氮石墨烯水凝胶(NGHs)。X-射线粉末衍射、拉曼光谱和傅立叶变换红外光谱证实了GO悬浮液在1h内完成了向水凝胶的转变。通过元素分析、X-射线光电子能谱(XPS)、场发射扫描电子显微镜(FESEM)、氮气吸附实验和电化学测试，证明了随着碳肼含量的增加，得到的NGH在超级电容器中表现出不同的N掺杂和不同的性能。根据网络结构，NGHs-1、NGHs-2、NGHs-5和NGHs-10均表现出高的比电容，在KOH电解液中，NGHs-1、NGHs-2、NGHs-5和NGHs-10在167.7、156.8、140.4和119.3−1、1A g−1的KOH电解液中表现出比电容。放电电流密度增加10A g−1时，比电容仍可分别保持80.5%、79.5%、80.3%和78.6%。更有趣的是，NGHs-1超级电容器在长期循环测试中也表现出良好的电化学稳定性和高度的可逆性(4000次循环后保持率为81.5%)。
Three-dimensional (3D) nitrogen-doped graphene hydrogels (NGHs) are designed and synthesized in an efficient and fast way by using a strong reductant of carbohydrazide as reducing and doping agent in an aqueous solution of graphene oxide (GO). The transformation of GO suspension to the hydrogels can be completed in 1 h, which can be confirmed by X-ray powder diffraction (XRD), Raman spectroscopy, and Fourier transform infrared spectroscopy (FT-IR). With adding different amounts of carbohydrazide, the obtained NGHs behave different doping of N and unlike performances in supercapacitors, which can be demonstrated by elemental analysis and X-ray photoelectron spectroscopy (XPS), field emission scanning electron microscopy (FESEM), N2sorption experiments, and electrochemical measurements, respectively. According to the network architectures, the NGHs all exhibited high specific capacitance, NGHs-1, NGHs-2, NGHs-5 and NGHs-10 showed specific capacitance at 167.7, 156.8, 140.4 and 119.3 F g−1at 1 A g−1in KOH electrolyte. The specific capacitance can still be maintained for 80.5, 79.5, 80.3 and 78.6% with an increase of the discharging current density of 10 A g−1, respectively. More interestingly, the NGHs-1 based supercapacitor also exhibited good electrochemical stability and high degree of reversibility in the long-term cycling test (81.5% retention after 4000 cycles).
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影响因子：
--
作者：
Xi-lin Wu;A. Xu
通讯作者：
Xi-lin Wu;A. Xu
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影响因子：
17.6
作者：
Chen, Ping;Yang, Jing-Jing;Yu, Shu-Hong
通讯作者：
Yu, Shu-Hong
影响因子：
10.9
作者：
G. Tang;Zhi‐Guo Jiang;Xiaofeng Li;Hao‐Bin Zhang;A. Dasari;Zhongzhen Yu
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DOI：
10.1021/jp508682g
发表时间：
2014-11
期刊：
The Journal of Physical Chemistry C
影响因子：
--
作者：
Ling-Bao Xing;Shu-Fen Hou;Jin Zhou;Shijiao Li;Tingting Zhu;Zhaohui Li;Weijiang Si;Shuping Zhuo
通讯作者：
Shuping Zhuo
影响因子：
29.4
作者：
Niu, Zhiqiang;Chen, Jun;Chen, Xiaodong
通讯作者：
Chen, Xiaodong