CAJ | 학술논문

采用改良的Hummers法，设计L9(34)正交实验研究了石墨来源、浓硫酸用量、合成温度及95℃控温时间对所合成氧化石墨(GO)特征峰强度的影响。用X射线衍射光谱法(XRD)、激光粒度分析仪及比表面和孔隙度分析仪，对GO晶体结构和粒径分布进行了分析；利用CV和线性极化曲线法研究了GO的电容特性。结果表明，石墨来源、浓硫酸用量和95℃控温时间影响最为显著。当石墨来源为鳞片石墨、浓硫酸用量为58 mL、合成温度为25℃和95℃控温时间为12 h的工艺参数，为最佳合成工艺条件。该工艺下所制备的GO试样层间距为0.73 nm，中值粒径50为11.02滋m，极化电阻仅为0.24Ω。在2 mV/s扫速下，其放电比电容达到234.1 F/g，即使扫速增加到50 mV/s，该电极仍然能放出高达121.5 F/g的比电容结构。
채용개량적Hummers법，설계L9(34)정교실험연구료석묵래원、농류산용량、합성온도급95℃공온시간대소합성양화석묵(GO)특정봉강도적영향。용X사선연사광보법(XRD)、격광립도분석의급비표면화공극도분석의，대GO정체결구화립경분포진행료분석；이용CV화선성겁화곡선법연구료GO적전용특성。결과표명，석묵래원、농류산용량화95℃공온시간영향최위현저。당석묵래원위린편석묵、농류산용량위58 mL、합성온도위25℃화95℃공온시간위12 h적공예삼수，위최가합성공예조건。해공예하소제비적GO시양층간거위0.73 nm，중치립경50위11.02자m，겁화전조부위0.24Ω。재2 mV/s소속하，기방전비전용체도234.1 F/g，즉사소속증가도50 mV/s，해전겁잉연능방출고체121.5 F/g적비전용결구。
Graphite oxide (GO) was prepared using the modified Hummers approach, and the orthogonal test L9(34) was designed to study the impacts of graphite source, concentrated sulfuric acid amount, synthesis temperature and temperature control ing time at 95℃ on the characteristic peaks intensity of GO. The crystal structure and particle diameter distribution of samples were characterized by XRD, laser particle size analyzer, specific surface area and pore distribution analyzer. The capacitance characteristic of GO was studied by cyclic voltammetry and linear polarization curves. The results show graphite source, concentrated sulfuric acid amount and temperature control ing time at 95 ℃ make the most significant influence on the capacitance characteristic of GO. The optimum reaction conditions are as fol ows: the graphite source is flake graphite; the concentrated sulfuric acid amount is 58 mL; the synthesis temperature is 25℃;the temperature control ing time at 95℃is 12 h. The as-prepared GO powders have the layer distance of 0.73 nm;the mean median grain size 50 is 11.02μm;the polarization resistance is only 0.24Ω. The discharge specific capacitance is 234.1 F/g with the scan rate of 2 mV/s, and 121.5 F/g with the high scan rate of 50 mV/s.