石墨烯包覆分子筛复合电极材料的制备及其性能研究

doi:10.15541/jim20160337

无机材料学报 ›› 2017, Vol. 32 ›› Issue (4): 386-392.DOI: 10.15541/jim20160337

石墨烯包覆分子筛复合电极材料的制备及其性能研究

赵晓婵^1,2, 房艳¹, 房春晖¹, 周永全¹, 戈海文¹, 朱发岩¹

(1. 中国科学院青海盐湖研究所, 盐湖资源与化学重点实验室, 西宁810008; 2. 中国科学院大学, 北京100049)

收稿日期:2016-05-24 修回日期:2016-07-18 出版日期:2017-04-20 网络出版日期:2017-03-24
作者简介:赵晓婵(1989–), 女, 硕士. E-mail: zhaoxiaochan111@126.com
基金资助:
中国科学院知识创新工程重要方向项目(KZCX2-EW-307)

Preparation and Electrochemical Performance of Composite Electrode Material of Molecular Sieve Coated with Graphene

ZHAO Xiao-Chan^1,2, FANG Yan¹, FANG Chun-Hui¹, ZHOU Yong-Quan¹, GE Hai-Wen¹, ZHU Fa-Yan¹

(1. Key Laboratory of Salt Lake Resources and Chemistry, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xi ning 810008, China; 2. University of the Chinese Academy of Sciences, Beijing 100049, China)

Received:2016-05-24 Revised:2016-07-18 Published:2017-04-20 Online:2017-03-24
About author:ZHAO Xiao-Chan. E-mail: zhaoxiaochan111@126.com
Supported by:
Chinese Academy of Sciences Knowledge Innovation Project Important Direction (KZCX2-EW-307)

摘要/Abstract

摘要：

以4A分子筛(4A)和改进Hummers法制备的氧化石墨烯凝胶(GO)为原料, 按一定质量比进行混合超声分散, 以混合分散液为前驱体煅烧制备了氧化还原石墨烯(RGO)包覆的三维复合4A/RGO电极材料。采用X射线衍射(XRD)、拉曼光谱(Raman)、孔径分析、扫描电子显微镜(SEM)和电化学测试等方法研究了复合材料的结构、形貌及超级电容性能。测试结果表明, 4A均匀地穿插在RGO片层中, 阻止了RGO片层之间相互堆积, 而RGO片层之间相互链接, 形成三维空间导电网络, 提高了复合电极材料的导电性。当GO与4A质量比为1:6时, 复合材料在4 A/g电流密度下比电容可达450 F/g, 在此电流密度下循环800次后, 其比容量保持率为85.7%, 表现出良好的倍率性能和循环稳定性。该4A/RGO复合电极材料超级电容性能优于纯4A或RGO, 可归因于4A和RGO之间的协同效应。

关键词: 三维复合电极, 石墨烯, 4A分子筛, 超级电容器, 协同效应

Abstract:

A 3D composite electrode was prepared by ultrasonic dispersion of a suspension mixed proportionally with 4A molecular sieve (4A) and graphene oxide gel (GO). The structure, morphology and electrochemical property of the 4A/reduced graphene oxide (RGO) composite were investigated by X-ray diffraction, Raman spectra, pore analysis, scanning electron microscope (SEM) and electrochemical measurements. The result shows that 4A is firmly adhered on the surface of RGO sheets, which can effectively avoid the stacking of RGO sheets. The RGO sheets link with each other to form a 3D electric conductive network in which can increase the electrical conductivity of the composite. The specific capacitance of 4A/RGO composite can reach 450 F/g at current density of 4 A/g when the mass ratio of graphene oxide and 4A is 1:6. Furthermore, the specific capacitance of 4A/RGO remains at 85.7% after 800 cycles under the same current density. Therefore these results indicate that this new composite possesses good rate capability and cycle stability and its supercapacitive performance is better than that of pure RGO or 4A. The excellent performance of the 4A/RGO composite can be attributed to the synergy between RGO and 4A.

Key words: 3D composite, 4A molecular seive, graphene, supercapacitor, synergy

中图分类号:

O646

赵晓婵, 房艳, 房春晖, 周永全, 戈海文, 朱发岩. 石墨烯包覆分子筛复合电极材料的制备及其性能研究[J]. 无机材料学报, 2017, 32(4): 386-392.

ZHAO Xiao-Chan, FANG Yan, FANG Chun-Hui, ZHOU Yong-Quan, GE Hai-Wen, ZHU Fa-Yan. Preparation and Electrochemical Performance of Composite Electrode Material of Molecular Sieve Coated with Graphene[J]. Journal of Inorganic Materials, 2017, 32(4): 386-392.

图/表 7

图1 样品的XRD图谱 (a)和Raman谱图(b)

Fig. 1 XRD patterns (a) and Raman spectra (b) of samples

图2 RGO和4A/RGO的孔径分布图

Fig. 2 Pore size distribution of RGO and 4A/RGO

图3 RGO(a、b)、4A(c、d)及4A/RGO(e、f)的SEM照片

Fig. 3 SEM images of RGO (a, b),4A (c, d) and 4A/RGO (e, f)

图4 (a)RGO和4A/RGO复合电极材料在10 mV/s扫描速率时的CV曲线和(b)4A/RGO复合电极材料在6 mol/L KOH中不同扫速时的CV曲线

Fig. 4 (a) CV curves of RGO, and 4A/RGO composite at scanning rate of 10 mV/s and (b) CV curves of 4A/ RGO composite at various scan rates in 6 mol/L KOH solution

图5 RGO、4A和4A/RGO的恒电流充放电测试结果

Fig. 5 Constant current charge and discharge curves of 4A, RGO and 4A/RGOGCD curves of the materials tested in the 6 mol/L KOH; (b) GCD curves (1-10th) of 4A/RGO composites at current density of 4 A/g;(c) Comparison of GCD curves with RGO and 4A/RGO at current density of 4 A/g; and (d) Specific capacitance of different materials at current density from 4 A/g to 16 A/g

图6 RGO、4A和4A/RGO在6 mol/L KOH溶液中的EIS曲线

Fig. 6 EIS curves of RGO, 4A and 4A/RGO composite in 6 mol/L KOH solution

图7 4 A/g电流密度下RGO、4A和4A/RGO的循环稳定性

Fig. 7 Cycle stability of RGO, 4A and 4A/RGO at current density of 4 A/g

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石墨烯包覆分子筛复合电极材料的制备及其性能研究

Preparation and Electrochemical Performance of Composite Electrode Material of Molecular Sieve Coated with Graphene

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