| Determination of H^＋ diffusion coefficient in the course of H^＋ response of a W/WO3 pH electrode |
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| 作者姓名： | CHEN Dongchu FU Zhaoyang ZHENG Jiashen |
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| 作者单位： | [1]College of Mechanical Engineering, South China University of Technology, Guangzhou 510640, China [2]School of Science, Foshan University, Foshan 528000, China [3]Chemistry Department, Huazhong University of Science and Technology, Wuhan 430074, China |
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| 基金项目： | This work was supported by the Science Foundation of Guangdong province of China （No. 05300370） and the Science Foundation of Foshan University. |
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| 摘 要： | A WAVO3 pH electrode was prepared by a method of sol-gel. In order to study the H^＋ response dynamic mechanism, the electrochemical impedance spectroscopy （EIS） experiment was conducted. It was found that the H^＋ response course is controlled by the H^＋ diffusion from the solution to the WO3 film, based on the analysis of EIS spectra. The EIS and potential step method were used to determinate the H＋ diffusion coefficient （D） in the course of H^＋ response of this WAVO3 electrode, and the values of D calculated by these two method correspond very well, which all are about 10^-19cm^2/s The imposed different potential steps make little effect on the calculation of H^＋ diffusion coefficient, and it was found that the limiting Cottrell equation of short elapsed time fits well to the current transient caused by a potential step, based on the analysis of the time constant.
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| 关 键 词： | H^＋ 扩散系数 W/WO3 PH电极 动力学机理 氧化钨 溶胶-凝胶 |
Determination of H+ diffusion coefficient in the course of H+ response of a W/WO3 pH electrode |
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| CHEN Dongchu FU Zhaoyang ZHENG Jiashen.Determination of H+ diffusion coefficient in the course of H+ response of a W/WO3 pH electrode[J].Rare Metals,2005,24(4):351-357. |
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| Authors: | CHEN Dongchu FU Zhaoyang ZHENG Jiashen |
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| Abstract: | A W/WO3 pH electrode was prepared by a method of sol-gel. In order to study the H response dynamic mecha- nism, the electrochemical impedance spectroscopy (EIS) experiment was conducted. It was found that the H response course is controlled by the H diffusion from the solution to the WO3 film, based on the analysis of EIS spectra. The EIS and potential step method were used to determinate the H diffusion coefficient (D) in the course of H response of this W/WO3 electrode, and the values of D calculated by these two method correspond very well, which all are about 10?10 cm2/s. The imposed different potential steps make little effect on the calculation of H diffusion coefficient, and it was found that the limiting Cottrell equation of short elapsed time fits well to the current transient caused by a potential step, based on the analysis of the time constant. |
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| Keywords: | pH electrode diffusion coefficient dynamic mechanism tungsten oxide sol-gel |
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