论文部分内容阅读
采用氨水还原氧化石墨烯(GO)制备石墨烯(GN),并考察石墨烯修饰玻碳电极(GN/GCE)电催化氧化p-苯二酚(HQ)的性能.利用傅里叶红外光谱(FTIR)、拉曼光谱(Raman)、X射线衍射(XRD)、扫描电子显微镜(SEM)、原子力显微镜(AFM)、比表面分析(BET)和电分析化学测试等技术对GN结构、表面形貌和电化学行为进行了表征.采用循环伏安法(CV)和差分脉冲溶出伏安法(DPV)研究GN/GCE对HQ的电催化氧化性能.结果表明,与裸玻碳电极(GCE)相比,[Fe(CN)6]3-/4-在GN/GCE上电荷转移电阻为75.0Ω.cm2,减小约9倍,说明GN具有良好导电性;同时HQ在GN/GCE上氧化峰电位负移,还原峰电位正移,峰电位差ΔEp减小165 mV,且氧化还原峰电流(Ipa和Ipc)均增大,HQ电化学氧化可逆性明显改善,表明GN/GCE对HQ氧化具有显著电催化作用.
Graphene (GN) was prepared by reduction of graphene oxide (GO) by ammonia water and the electrocatalytic oxidation of p-hydroquinone (HQ) by graphene modified glassy carbon electrode (GN / GCE) was investigated by Fourier transform infrared spectroscopy FTIR, Raman, XRD, SEM, AFM, BET and electroanalytical chemistry were used to characterize the structure of GN, surface topography And electrochemical behavior were characterized by cyclic voltammetry (CV) and differential pulse stripping voltammetry (DPV) to study the electrocatalytic oxidation of HQ by GN / GCE. The results show that the electrocatalytic oxidation of HQ with the bare glassy carbon electrode The charge transfer resistance of [Fe (CN) 6] 3- / 4- on GN / GCE was 75.0Ω.cm2, a decrease of about 9 times, indicating that GN has good conductivity; meanwhile, the oxidation peak of HQ on GN / GCE The potential of negative potential shift, the positive peak potential shift, the peak potential difference ΔEp decreased 165 mV, and redox peak current (Ipa and Ipc) were increased, HQ electrochemical oxidation reversibility significantly improved, indicating that GN / GCE HQ oxidation has Significant electrocatalysis.