摘要
基于对单颗粒准球形储氢合金的电势阶跃计时电流曲线的全程拟合,采用"扩散和表面转化混合控制"模型取代流行的纯扩散模型,并根据该模型,估算出储氢合金氢的扩散系数D约为6×10-10cm2.s-1、氢的初始浓度c约为0.008 mol.cm-3、表面转化步骤的表观反应速率常数K约为8×10-6cm.s-1。
On the basis of the simulations for the full curves ＂of potential step measurements on single particles of LaNi5 metal hydride and relevant information found in the literature,it was suggested to replace the prevailing ＂diffusion only＂ model with the ＂diffusion plus surface conversion＂ model. Calculated through the model,diffusion coefficient of hydrogen D of about 6 × 10^-10 cm^2 · s^-1 , initial hydrogen concentration c of about 0. 008 mol · cm^-3 and apparent surface reaction constant K of about 8× 10^-6 cm·s^-1 were estimated.
出处
《化学与生物工程》
CAS
2008年第9期8-11,共4页
Chemistry & Bioengineering
关键词
储氢合金
扩散系数
表面转化步骤
metal hydride
diffusion coefficient
surface transfer step
作者简介
肖亮（1979-），男，湖北仙桃人，博士，讲师，主要研究方向：电极过程动力学、材料电化学。E—mail：xiaoliang@whut．edu．cn。
