Electrochemical Methods for Measuring Diffusivities of Hydrogen in Palladium and Palladium Alloys
Electrochemical Methods for Measuring Diffusivities of Hydrogen in Palladium and Palladium Alloys
复制标题
测量钯和钯合金中氢扩散率的电化学方法
DOI：
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发表时间：
1980
期刊：
影响因子：
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通讯作者：
R. Mclellan
中科院分区：
文献类型：
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作者：
R. Kirchheim;R. Mclellan
钯双电极已用于由甘油和磷酸组成的粘性电解质中。与水性电解质相比，这种电解质中分子氢往返于电极的传输显着减少。因此，电极电势的变化明确地与电极内扩散引起的浓度变化相关。应用单电流脉冲和恒电位技术来确定 H 在各种浓度和不同温度下在 Pd 中的扩散系数。电流时间和电位时间曲线的新评估方法还得出初始浓度值，该值与之前库仑滴定计算的值非常一致。两个双电极的特殊布置还可以测量两个电极中氢扩散率的微小差异。纯钯中氢扩散的结果与戈尔斯基效应测量结果非常一致。
A palladium bielectrode has been used in a viscous electrolyte consisting of glycerin and phosphoric acid. The transport of molecular hydrogen from and to the electrode is remarkably diminished in this electrolyte in comparison with aqueous electrolytes. Therefore, changes of the electrode potential are unambiguously related to concentration changes caused by diffusion within the electrode. A single current pulse and a potentiostatic technique were applied to determine the diffusion coefficients of H in Pd over a wide range of concentration and at different temperatures. New evaluation methods for current‐time and potential‐time curves also yield values of the initial concentration, which are in excellent agreement with the values calculated from previous coulometric titrations. A special arrangement of two bielectrodes also allows the measurement of small differences in the diffusivities of hydrogen in the two electrodes. Results for hydrogen diffusion in pure palladium are in excellent agreement with Gorsky effect measurements.