Measurements of diffusion coefficients of hydrogen in palladium by a galvanostatic permeation method
Measurements of diffusion coefficients of hydrogen in palladium by a galvanostatic permeation method
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恒电流渗透法测定氢在钯中的扩散系数
DOI：
10.1016/0360-3199(85)90066-7
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发表时间：
1985
影响因子：
7.2
通讯作者：
R. Bucur
中科院分区：
文献类型：
--
作者：
R. Bucur
本文报道了用恒电流渗透法测定氢在钯中扩散系数的方法。介绍了恒温电化学渗透池。在恒电位条件下，通过测量阳极电流Ia，在钯膜电极（几何表面积7.2 cm 2;厚度5× 10− 3 cm）的检测侧测定氢渗透速率。测量已上升和衰减的I a时，膜的氢入口侧已受到恒定的阴极电流I c，随后被中断后，建立的稳态条件。半对数图的IA对时间产生了可靠的测定氢和氘的扩散系数DH和DD。研究了IC、膜表面粗糙度、电解质溶液变化、表面污染和温度的变化对DH测量的影响。在5-50° C的温度范围内，表示扩散系数的温度依赖性的方程已被确定为：DH = 2.48× 10− 3 exp− 5210 RT;和D D= 1.67× 10− 3 exp− 4830 RT
A study by the galvanostatic permeation technique is reported which has derived reliable and reproducible measurements of diffusion coefficients for hydrogen in palladium. A description is given of the thermostated electrochemical permeation cell. Hydrogen permeation rates have been determined on the detection side of a palladium membrane electrode (geometrical surface area 7.2 cm 2; thickness 5× 10− 3 cm) by measuring the anodic current I a under potentiostatic conditions. Measurements have been made of rising and decaying I a when the hydrogen entrance side of the membrane has been subjected to constant cathodic currents I c which were subsequently interrupted after establishments of steady-state conditions. Semi-log plots of I a against time have yielded reliable determinations of the hydrogen and deuterium diffusion coefficients D H and D D. Studies have been made of the influence on measurement of D H by alterations of I c, surface roughness of the membrane, variations of electrolyte solution, surface contamination and temperature. Over the temperature range 5–50° C equations representing the temperature dependence of the diffusion coefficients have been determined to be: D H= 2.48× 10− 3 exp− 5210 RT; and D D= 1.67× 10− 3 exp− 4830 RT