Predicting size effect on diffusion-limited current density of oxygen reduction by copper wire |
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| Authors: | Yonghong Lu Haibo Xu Jia Wang Lian Zhong |
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| Institution: | (1) College of Science, Nanjing University of Technology, Nanjing, 210009, People’s Republic of China |
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| Abstract: | The size effect of copper wire radius (0.04?C0.82 mm) on the diffusion-limited current density of an oxygen reduction reaction in stagnant simulated seawater (naturally aerated 0.5 mol/L NaCl) is investigated by potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) and compared with the results obtained in 0.5 mol/L H2SO4. In the oxygen diffusion-limited range, size effect is found to occur independent of electrolytes, which is attributed to non-linear diffusion. Additionally, to satisfy application in a marine setting, an empirical equation correlating oxygen diffusion-limited current density to copper wire radius is proposed by fitting experimental data. |
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