Self-assembled reduced graphene hydrogels by facile chemical reduction using acetaldehyde oxime for electrode materials in supercapacitors
Self-assembled reduced graphene hydrogels by facile chemical reduction using acetaldehyde oxime for electrode materials in supercapacitors
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使用乙醛肟通过简单化学还原自组装还原石墨烯水凝胶作为超级电容器的电极材料
DOI：
10.1039/c6ra04348h
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发表时间：
2016-05
期刊：
影响因子：
3.9
通讯作者：
Shuping Zhuo
中科院分区：
文献类型：
--
作者：
Man Jiang;Jingli Zhang;Fei Qiao;Ruiying Zhang;Lingbao Xing;Jin Zhou;Hongyou Cui;Shuping Zhuo
以乙醛肟为还原剂和掺杂剂，通过氨水对氧化石墨烯（GO）分散体进行简单的化学还原，制备了自组装三维（3D）还原石墨烯水凝胶（RGH）。通过傅里叶变换红外光谱（FT-IR）、X射线光电子能谱（XPS）、X射线衍射（XRD）和拉曼光谱证实了GO的化学还原。通过场发射扫描电子显微镜（FESEM）和N2吸附实验可以证明所得到的RGH的分级孔隙率和结构。得益于发达的孔隙率和微孔-介孔分级结构，RGH的比电容在6 M KOH电解液中分别为230.4、155.3、234.2、155.1和191.8 F g−1（0.3 A g−1）。更重要的是，RGH保持了167.1、110.4、142.3、106.9和142.3 F g−1的高电容（RGH-1、RGH-2、RGH-5、RGH-10和RGH-15的保留率分别为72.5%、71.1%、60.8%、68.9%和74.2%），在20 A g−1的极高电流密度下，表明在重复充电/放电循环试验中具有良好的电化学稳定性和高度的可逆性。
Self-assembled three-dimensional (3D) reduced graphene hydrogels (RGHs) were fabricated by the facile chemical reduction of a graphene oxide (GO) dispersion with ammonia using acetaldehyde oxime as reducing and doping agent. The chemical reduction of GO was confirmed by Fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), and Raman spectroscopy. The hierarchical porosity and structures of the resulting RGHs can be demonstrated by field emission scanning electron microscopy (FESEM) and N2 sorption experiments. Benefiting from the developed porosity with micro-meso hierarchical pore texture, the specific capacitance of RGHs exhibited high specific capacitances of 230.4, 155.3, 234.2, 155.1 and 191.8 F g−1 at 0.3 A g−1 for RGHs-1, RGHs-2, RGHs-5, RGHs-10 and RGHs-15 in 6 M KOH electrolyte, respectively. More importantly, the RGHs maintained high capacitances of 167.1, 110.4, 142.3, 106.9 and 142.3 F g−1 (the retention rates are 72.5, 71.1, 60.8, 68.9 and 74.2% for RGHs-1, RGHs-2, RGHs-5, RGHs-10 and RGHs-15) at a very high current density of 20 A g−1, indicating good electrochemical stability and a high degree of reversibility in the repetitive charge/discharge cycling test.
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