塔菲尔方程
极化(电化学)
电解质
水平扫描速率
动力学
化学
分析化学(期刊)
材料科学
电化学
电极
物理化学
物理
色谱法
量子力学
循环伏安法
作者
Hu Zhou,Danny Chhin,Alban Morel,Danick Gallant,Janine Mauzeroll
标识
DOI:10.1038/s41529-022-00227-3
摘要
Abstract The drastic distortion of potentiodynamic polarization curves measured at high potential scan rates prevents the extraction of accurate kinetic parameters. In this work, we start by measuring potentiodynamic polarization curves of AA7075 at scan rates ranging from 0.167 mV·s −1 to 100 mV·s −1 , in an acidic 0.62 M NaH 2 PO 4 solution and a near-neutral 3.5 wt% NaCl solution. Changes in potentiodynamic polarization curves are observed not only at different scan rates and electrolytes but also between replicated experiments. Contrary to what was reported in previous studies, the disturbance of charging current associated with high scan rates does not satisfactorily explain the potentiodynamic polarization shape. Instead, the high field model that incorporates the kinetics of anodic oxide growth successfully captures the features of experimental potentiodynamic polarization curves. Compared to Tafel’s theory, the high field model explains remarkably the changing kinetics with scan rates, electrolytes, and the variance between measurements performed at different sites.
科研通智能强力驱动
Strongly Powered by AbleSci AI