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Reduced graphene oxide hydrogels prepared in the presence of phenol for high-performance electrochemical capacitors
New Carbon Materials ( IF 5.7 ) Pub Date : 2019-11-20 , DOI: 10.1016/s1872-5805(19)60022-3
Xiang-li Gao , Cui-xian Liu , Gao-yi Han , Hua Song , Yao-ming Xiao , Hai-han Zhou

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 °C 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.



中文翻译:

在苯酚存在下制备的还原型氧化石墨烯水凝胶,用于高性能电化学电容器

通过在苯酚存在下对GO进行水热处理,合成了还原的氧化石墨烯(GO)水凝胶,得到rGOHPhs,其中苯酚既是水凝胶的还原剂又是结构调节剂。研究了GO与苯酚的质量比和水热温度对rGOHPhs电容性能的影响。结果表明,在相同的水热条件下,rGOHPhs比不含苯酚的rGOH样品具有更发达的三维孔网。最佳rGOHPh在160°C下制备12 h,GO /苯酚质量比为1 / 1.25,并且比在相同水热条件下制备的rGOH具有更大的微孔和总孔体积。最佳rGOHPh在1 mV s的扫描速率下具有约260.0 F g -1的比电容-1,比rGOH(182.5 F g -1)高得多。此外,最佳rGOHPh具有优异的倍率性能(138.1 F G -1在500毫伏小号-1)和(12 000次循环后98.3%的电容保持率)良好的循环稳定性。使用最佳rGOHPh组装的电容器在功率密度分别为0.125和16 kW kg -1时分别具有大约8.9和2.0 Wh Kg -1的能量密度,这高于文献中报道的大多数基于GO的电容器。发达的孔网络归因于苯酚及其氧化产物醌,它们作为间隔物和氧化还原对吸附在rGO表面上,以提供伪电容。

更新日期:2019-11-20
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