氧化石墨超声时间对三维还原氧化石墨烯结构及超级电容性能的影响

doi:10.7503/cjcu2014086

高等学校化学学报 ›› 2015, Vol. 36 ›› Issue (2): 221.doi: 10.7503/cjcu2014086

• 研究论文: 无机化学 • 上一篇下一篇

氧化石墨超声时间对三维还原氧化石墨烯结构及超级电容性能的影响

汪建德¹, 彭同江^2,³(), 鲜海洋³, 孙红娟³, 侯云丹¹

1. 西南科技大学材料科学与工程学院, 绵阳 621000
2. 西南科技大学分析测试中心, 绵阳 621010
3. 西南科技大学矿物材料及应用研究所, 绵阳 621000

收稿日期:2014-09-23 出版日期:2015-02-10 发布日期:2015-01-22
作者简介:联系人简介: 彭同江, 男, 博士, 教授, 主要从事晶体化学研究. E-mail: tjpeng@swust.edu.cn
基金资助:
国家自然科学基金(批准号: 41272051)、西南科技大学博士基金(批准号: 11ZX7135)、西南科技大学研究生创新基金(批准号: 14ycx003)和绵阳科技城大学生创新创业俱乐部示范点建设苗子工程项目子课题(批准号: 2014RZ0038-15)资助

Effect of Ultrasonic Time for Graphite Oxide on the Structure and Super Capacitor Performance of Three-dimensional Reduced Graphene Oxide^†

WANG Jiande¹, PENG Tongjiang^2,^3,^*(), XIAN Haiyang³, SUN Hongjuan³, HOU Yundan¹

1. School of Materials Science and Engineering, Southwest University of Science and Technology, Mianyang 621000, China
2. Center of Forecasting and Analysis, Southwest University of Science and Technology, Mianyang 621010, China
3. Institute of Mineral Materials & Application, Southwest University of Science and Technology, Mianyang 621000, China

Received:2014-09-23 Online:2015-02-10 Published:2015-01-22
Contact: PENG Tongjiang E-mail:tjpeng@swust.edu.cn
Supported by:
Supported by the National Natural Science Foundation of China(No.41272051), the Doctor Foundation of Southwest University of Science and Technology, China(No.11ZX7135), the Postgraduate Innovation Fund Project by Southwest University of Science and Technology, China(No.14ycx003) and the Miaozi Subtopic Project for the Construction of Mianyang Sci-tech City University Students’ Innovative Undertaking Club Demonstration Site, China(No.2014RZ0038-15)

摘要/Abstract

摘要：

将氧化石墨凝胶超声不同时间制备氧化石墨烯(GO)溶胶, 再以GO溶胶为前驱体采用一步水热法制备了三维还原氧化石墨烯(3DRGO), 采用X射线衍射(XRD)、拉曼光谱、原子力显微镜(AFM)、扫描电子显微镜(SEM)和电化学测试等研究了不同超声时间对3DRGO的形貌、结构及超级电容性能的影响. 结果表明, 当超声时间不超过120 min时, 经水热反应后还原氧化石墨烯均能形成稳定的三维结构, 但随着超声时间的延长, 三维结构尺寸不断减小, 强度增加, 样品的内部结构也由片状逐渐向多孔网状转化; 当超声时间超过120 min时, 还原氧化石墨烯虽具有网状结构, 但在宏观上不利于形成稳定的三维结构. 电化学测试结果表明, 经不同超声时间所制备的还原氧化石墨烯均表现出较好的超级电容性能, 其中超声时间为120 min时制备的3DRGO具有更均匀的多孔网状结构, 表现出了最佳的超级电容性能, 在1 A/g电流密度下其比电容可达328 F/g, 即使在20 A/g的大电流密度条件下, 其比电容仍可高达240 F/g.

关键词: 氧化石墨凝胶, 超声时间, 水热法, 三维还原氧化石墨烯, 超级电容性能

Abstract:

Three-dimensional reduced graphene oxide(3DRGO) was prepared from graphene oxide(GO) with different ultrasonic time by one-step hydrothermal method. X-Ray diffraction(XRD), Raman spectroscopy, atom force microscopy(AFM), scanning electron microscopy(SEM) and elctrochemical measurements were used to investigate the structure and supercapacitive performance of 3DRGO. The results show that when the ultrasonic time is less than 120 min, stabilized three-dimensional structure can be formed in the hydrothermal reduced graphene oxide. Along with the increase of the ultrasonic time, the size of 3DRGO decrease while the strength increase, and the inner structure of 3DRGO transforms from schistose to network. When the ultrasonic time is longer than 120 min, the stability of the network in 3DRGO is inferior on a macro level. The results of electrochemical measurements show that all the 3DRGO samples prepared with different ultrasonic time have good supercapacitive performance. The sample prepared with 120 min has the best supercapacitive performance for its well-proportioned network. The capacity can reach 328 F/g at the current density of 1 A/g and 240 F/g at the high current density of 20 A/g.

Key words: Graphite oxide gel, Ultrasound time, Hydrothermal method, Three dimensional reduction of graphene oxide, Super capacitor performance

中图分类号:

O613

TrendMD:

汪建德, 彭同江, 鲜海洋, 孙红娟, 侯云丹. 氧化石墨超声时间对三维还原氧化石墨烯结构及超级电容性能的影响. 高等学校化学学报, 2015, 36(2): 221.

WANG Jiande, PENG Tongjiang, XIAN Haiyang, SUN Hongjuan, HOU Yundan. Effect of Ultrasonic Time for Graphite Oxide on the Structure and Super Capacitor Performance of Three-dimensional Reduced Graphene Oxide^†. Chem. J. Chinese Universities, 2015, 36(2): 221.

图/表 8

Fig.1 Deposition conditions of samples GO-x(x=0, 30, 60, 90, 120, 150, 180) after standing for 30 d

Fig.2 AFM images of 3DRGO-0(A), 3DRGO-60(B), 3DRGO-120(C) and 3DRGO-180(D)

Fig.3 SEM images of samples 3DRGO-0(A), 3DRGO-30(B), 3DRGO-60(C), 3DRGO-90(D), 3DRGO-120(E), 3DRGO-150(F) and 3DRGO-180(G)

Fig.4 XRD patterns of samples GO and 3DRGO-x (x=0, 30, 60, 90, 120, 150, 180)

Fig.5 Raman spectra of samples GO and 3DRGO-x (x=0, 30, 60, 90, 120, 150, 180)

Fig.6 Schematic diagram of self-assembly process of 3DRGO

Fig.7 Schematic diagram of self-assembly principle of 3DRGO

Fig.8 CV curves at scan rate of 5 mV/s(A), charge-discharge curves at 1 A/g current density(B), specific capacitance at different current densities(C) and Nyquist plots for 3DRGO(D)

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氧化石墨超声时间对三维还原氧化石墨烯结构及超级电容性能的影响

Effect of Ultrasonic Time for Graphite Oxide on the Structure and Super Capacitor Performance of Three-dimensional Reduced Graphene Oxide^†

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氧化石墨超声时间对三维还原氧化石墨烯结构及超级电容性能的影响

Effect of Ultrasonic Time for Graphite Oxide on the Structure and Super Capacitor Performance of Three-dimensional Reduced Graphene Oxide†

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Effect of Ultrasonic Time for Graphite Oxide on the Structure and Super Capacitor Performance of Three-dimensional Reduced Graphene Oxide^†