The characterisation of PbO2-coated electrodes prepared from aqueous methanesulfonic acid under controlled deposition conditions
作者:I. Sirés、C.T.J. Low、C. Ponce-de-León、F.C. Walsh
DOI:10.1016/j.electacta.2009.11.051
日期:2010.2
carbon substrates has been prepared by anodic deposition in aqueous methanesulfonic acid (MSA) under galvanostatic conditions. The effect of four experimental parameters, i.e., lead(II) methanesulfonate and MSA concentrations, current density, and temperature was analysed. Surface characterisation by XRD, SEM-EDX, and AFM has provided information about the structural (phase distribution, degree of crystallinity
在恒电流条件下,通过在甲磺酸水溶液(MSA)中进行阳极沉积,在平面碳基材上制备了一系列PbO 2涂层。分析了四个实验参数,即甲磺酸铅(II)和MSA浓度,电流密度和温度的影响。通过XRD,SEM-EDX和AFM进行的表面表征提供了有关PbO的结构(相分布,结晶度和微晶尺寸),形态(微晶形状,孔隙度)和摩擦学(表面粗糙度)特性的信息分别有2种涂料。基于线性和循环伏安法的电化学研究可以比较MSA中制备的电极和HNO 3中制备的经典电极。纯α-或β-PBO 2根据条件,获得和α+β的混合物,作为温度最有影响力的沉积参数。温升引起纯的过渡β-PBO 2和导致与微晶尺寸的逐渐增加,一直的10-30纳米的范围内,以及以显着更高的粗糙度较高的结晶度,从光滑( 35–50 nm rms)到粗糙(最大500 nm rms)表面。需要较低的MSA和较高的甲磺酸铅(II)浓度,以避免形成过多的多孔粉末涂层以及裂