有机添加剂对三维多孔二氧化铅阳极性能的影响

Effect of organic additives on properties of three dimensional porous lead dioxide anode

以氧泡为模板,采用阳极氧化法制备系列三维多孔二氧化铅阳极材料,探究添加剂醋酸钠、十六烷基三甲基溴化铵(CTAB)、十二烷基苯磺酸钠(SDBS)、聚乙二醇(PEG)对三维多孔PbO_(2)阳极材料的影响。利用SEM和XRD对电极表面的形貌结构和物相组成进行表征。采用阳极极化曲线(LSV)、循环伏安曲线(CV)、交流阻抗图谱(EIS),对电极材料的电催化活性进行测定。结果表明:添加剂加入后,能够促进Pb^(2+)均匀分散,当PbO_(2)沉积后包覆其表面,减少颗粒聚集,镀层更为平整致密;同时,由于有机添加剂的吸附作用,改变晶粒择优取向,但不改变晶型,制备的电极材料仍为β-PbO_(2),形貌完整,均具有三维多孔结构。添加了有机添加剂后,电极材料孔密度增大,提升电极材料比表面积,降低电催化过程中的电荷转移电阻,提高电极材料的电催化活性。其中,加入SDBS的多孔PbO_(2)电极具有最大的j0(5.514×10^(-5)A·cm^(-2))和最小的Rct(0.3395Ω·cm2),体现出良好的电催化性能。由CV数据可知,添加了SDBS的PbO_(2)电极qi^(*)为0.652 C·cm^(-2),是未加入添加剂的多孔PbO_(2)电极的4倍,有机添加剂的加入有效地增大了电极材料电化学活性表面积。

A series of three-dimensional porous lead dioxide anode materials were prepared by anodizing method using oxygen bubbles as templates.The effects of additives sodium acetate,cetyltrimethyl ammonium bromide(CTAB),sodium dodecyl benzene sulfonate(SDBS)and polyethylene glycol(PEG)on three-dimensional porous PbO_(2)anode materials were studied.The morphology and phase composition of the electrode surface were characterized by SEM and XRD.The electrocatalytic activity of the electrode material in Na2SO4solution was determined by anodic polarization curve(LSV),cyclic voltammetry curve(CV)and AC impedance spectrum(EIS).The results show that after the addition of additives,the directional arrangement on the surface of the plating bath can promote the uniform dispersion of Pb^(2+),when PbO_(2)is deposited,the surface is coated,the particle aggregation is reduced,and the coating is flatter and denser;at the same time,due to the adsorption of organic additives,the preferred orientation of grains is changed,but the crystal form is not changed,the prepared electrode materials are stillβ-PbO_(2)with complete morphology and three-dimensional porous structure.With the addition of organic additives,the pore density of the electrode material is increased,the specific surface area of the electrode material is promoted,the charge transfer resistance in the electrocatalysis process is reduced,and the electrocatalytic activity of the electrode material is improved.Among all organic additives,the porous PbO_(2)electrodes added with SDBS has the largest j~0(5.514×10^(-5)A·cm^(-2))and the smallest Rct(0.3395Ω·cm~2),showing good electrocatalytic performance.According to the CV data,the qi*of the PbO_(2)electrode with SDBS is 0.652 C·cm^(-2),which is 4 times higher than that of the porous PbO_(2)electrode without additive,The addition of organic additives effectively increases the electrochemically active surface area of the electrode material.