泡沫镍负载石墨烯/钯复合电极催化H2O2电还原研究

采用简单的一步浸渍法制备了还原氧化石墨烯-贵金属Pd复合改性的泡沫镍电极,采用X射线衍射和扫描电镜对复合电极的微观结构和表面形貌进行分析,通过循环伏安法、线性伏安法、计时电流法对H₂O₂还原反应的催化活性及稳定性进行了测试。结果表明,石墨烯包覆在泡沫镍骨架表面,在石墨烯内均匀分散着贵金属Pd纳米颗粒,直径约为100nm。该复合电极对H₂O₂电还原表现出较好的催化性能。在1mol/L NaOH+0.5mol/L H₂O₂混合溶液中,电位为-0.5V时,电流密度可达164mA/cm²,同时表现出较好的稳定性。

Electrocatalytic reduction of H2O2by foam Ni supported rGO oxide/Pd composite electrode

The foamed Ni electrode modified by reduced graphene(rGO)oxide-precious metal Pd was prepared by a simple one-step impregnation method.The microstructure and surface morphology of the composite electrode were analyzed by X-ray diffraction(XRD)and scanning electron microscopy(SEM).The catalytic activity and stability of the electrode in H₂O₂reduction reaction were tested by cyclic voltammetry,linear voltammetry and chronoamperometry.The results shown that the rGO oxide was coated on the surface of the foamed Ni skeleton,and the noble metal Pd nanoparticles with the diameter of about 100 nm were uniformly dispersed in the rGO oxide.The composite electrode exhibited good catalytic performance for H₂O₂electroreduction.In the mixed solution of 1 mol/L NaOH+0.5 mol/L H₂O₂,the current density can reach 164 mA/cm² when the potential was-0.5 V,and it shown good stability.