苯酚存在下制备的还原氧化石墨烯水凝胶的电化学性能

高湘丽; 刘翠仙; 韩高义; 宋华; 肖尧明; 周海涵

doi:10.1016/S1872-5805(19)60022-3

苯酚存在下制备的还原氧化石墨烯水凝胶的电化学性能

doi: 10.1016/S1872-5805(19)60022-3

1.
分子科学研究所, 能量转换与存储材料山西省重点实验室, 山西太原 030006;
2.
太原师范学院化学系, 山西榆次 030619;
3.
山西大学外国语学院, 山西太原 030006

基金项目: 国家自然科学基金（U1510121，21574076，21501113，61504076，21407100）；山西省自然科学基金（2014011016-1，2015021129）；山西省高校青年科技创新项目（020352901014）；山西省研究生教育创新项目（2016BY009）；山西"1331工程"重点创新研究团队.

详细信息

作者简介:
高湘丽,硕士.E-mail:462443237@qq.com;刘翠仙,博士,讲师.E-mail:1065303340@qq.com.

通讯作者:
韩高义,教授.E-mail:han_gaoyis@sxu.edu.cn;肖尧明,教授.E-mail:ymxiao@sxu.edu.cn

中图分类号: TQ127.1⁺1
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出版历程
- 收稿日期: 2019-07-20
- 录用日期: 2019-11-04
- 修回日期: 2019-09-30
- 刊出日期: 2019-10-28

Reduced graphene oxide hydrogels prepared in the presence of phenol for high-performance electrochemical capacitors

1.
Institute of Molecular Science, Key Laboratory of Materials for Energy Conversion and Storage of Shanxi Province, Taiyuan 030006, China;
2.
Department of Chemistry, Taiyuan Normal University, Yuci 030619, China;
3.
School of Foreign Languages, Shanxi University, Taiyuan 030006, China

Funds: National Natural Science Foundation of China (U1510121, 21574076, 21501113, 61504076, 21407100); National Natural Science Foundation of Shanxi province (2014011016-1, 2015021129); The Program for the Top Young and Scientific and Technological Innovation Programs of Higher Education Institutions in Shanxi (020352901014); Graduate student education innovation project in Shanxi Province (2016BY009); Shanxi "1331 Project" Key Innovative Research Team.

摘要

摘要: 在苯酚存在下，通过水热法制备了还原氧化石墨烯水凝胶（rGOHPhs），详细地对样品进行了表征并系统地研究了氧化石墨烯与苯酚的比例和水热处理温度对所得水凝胶电容性能的影响。结果表明，制备的样品都具有三维网络结构，与不存在苯酚时制备的水凝胶（rGOHs）相比，在优化条件下制备的rGOHPhs的比表面积（422 m² g^-1），但具有大的总孔体积，说明在制备过程中，苯酚既有还原作用还具有结构调节作用。以制备的水凝胶为电极材料，组装了对称电化学电容器并采用两电极法对其性能进行了测试。发现在1 mV s^-1的扫描速率下，材料的比电容可达260.0 F g^-1，远大于rGOH的182.5F g^-1；并且rGOHPhs具有良好的倍率性能和循环稳定性，在500 mV s^-1的电流密度下其比电容值仍达138.1 F g^-1；经过12 000圈循环，仍可保留其初始电容值的98.3%。基于电极材料质量，在功率密度分别为0.125和16 kW kg^-1时，组装的电容器的能量密度可达8.9和2.0 Wh Kg^-1。这种发达的多孔网络归因于苯酚及其氧化产物醌吸附在rGO表面作为间隔和氧化还原对来提供赝电容。
- 电化学电容器 /
- 石墨烯水凝胶 /
- 水热法 /
- 苯酚
Abstract: Reduced graphene oxide (GO) hydrogels were synthesized by the hydrothermal treatment of GO in the presence of phenol to obtain rGOHPhs, where phenol acted as both a reducing agent and a structure regulator for the hydrogels. The influence of the mass ratio of GO to phenol and the hydrothermal temperature on the capacitive behavior of the rGOHPhs were investigated. Results indicate that the rGOHPhs have a more developed three-dimensional pore network than the rGOH samples without phenol under the same hydrothermal conditions. The optimum rGOHPh was prepared at 160℃ for 12 h with a GO/phenol mass ratio of 1/1.25 and had a larger micropore and total pore volume than rGOH prepared under the same hydrothermal conditions. The optimum rGOHPh had a specific capacitance of about 260.0 F g^-1 at a scan rate of 1 mV s^-1, which is much higher than that of the rGOH (182.5 F g^-1). Furthermore, the optimum rGOHPh has an excellent rate capability (138.1 F g^-1 at 500 mV s^-1) and a good cycling stability (98.3% capacitance retention after 12 000 cycles). A capacitor assembled using the optimum rGOHPh had energy densities of about 8.9 and 2.0 Wh Kg^-1 at power densities of 0.125 and 16 kW kg^-1, respectively, which are higher than most of the GO-based capacitors reported in the literature. The well-developed pore network is ascribed to the phenol and its oxidation product quinone that were adsorbed on the rGO surface as spacers and redox pairs to provide pseudo capacitance.
- Electrochemical capacitor /
- Graphene hydrogel /
- Hydrothermal /
- Phenol

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