功能化石墨烯多层膜载金催化剂的制备及其对肼的电催化氧化

Preparation of functionalized graphene multilayer films supported Au catalyst and its electro-oxidation for hydrazine

以聚二甲基二烯丙基氯化铵功能化石墨烯(PDDA-GNs)和磷钼酸功能化石墨烯(PMo12-GNs)为原料,利用层层自组装法制备了功能化石墨烯多层膜({PDDA-GNs/PMo12-GNs}),以此多层膜为载体,通过恒电位电沉积法制备功能化石墨烯多层膜载金催化剂(Au/{PDDA-GNs/PMo12-GNs}n)。采用XRD、XPS和SEM等表征Au/{PDDA-GNs/PMo12-GNs}n催化剂的组成、结构和形貌。结果表明:实验成功制备了Au/{PDDA-GNs/PMo12-GNs}n催化剂,且多层膜载体改善了Au粒子的分散性。利用循环伏安(CV)、计时电流(It)和交流阻抗(EIS)等评价催化剂对肼氧化的电催化性能。结果表明,Au/{PDDA-GNs/PMo12-GNs}n催化剂使肼氧化的电催化活性和稳定性得到很大提高。与Au/玻碳电极(GCE)相比,Au/{PDDA-GNs/PMo12-GNs}n催化肼氧化反应的峰电流密度从0.46 mA/cm2提高到0.87 mA/cm2,600 s时的稳态电流密度是Au/GCE的2.5倍。

The multilayer films consisting of polydimethyldiallyl ammonium chloride functionalized graphene(PDDA-GNs)and phosphomolybdate functionalized graphene(PMo12-GNs)({PDDA-GNs/PMo12-GNs})were fabricated on the substrate by layer-by-layer self-assembly technique.The{PDDA-GNs/PMo12-GNs}multilayer films were used as catalyst carrier for electrodeposition of Au nanoparticles(Au/{PDDA-GNs/PMo12-GNs}n).The Au/{PDDA-GNs/PMo12-GNs}n fabricated catalyst was characterized by XRD,XPS and SEM.The results indicate that Au nanoparticles are uniformly-dispersed on the{PDDA-GNs/PMo12-GNs}n multilayer films.Cyclic voltammetry(CV),chronoamperometry(It)and electrochemical impedance spectra(EIS)analyses show that the Au/{PDDA-GNs/PMo12-GNs}n has high electrocatalytic activity and stability regarding hydrazine oxidation.Compared with Au/glassy carbon electrode(GCE),the hydrazine oxidation current density of Au/{PDDA-GNs/PMo12-GNs}n increases from 0.46 mA/cm2 to 0.87 mA/cm2.And the steady current density of the Au/{PDDA-GNs/PMo12-GNs}n catalyst is 2.5 times as high as the Au/GCE catalyst.