کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4908221 | 1426589 | 2017 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
The influence of dissolved O2 on the electrochemical behaviors of Co-B alloy electrode
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
مهندسی شیمی (عمومی)
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چکیده انگلیسی
The influence of dissolved oxygen on the electrochemical behaviors of the CoB alloy electrode has been investigated by open circuit potential (OCP) measurement and galvanostatic charge-discharge method. It was found that the alloy electrode in oxygen-containing electrolyte has more positive OCP due to the existence of the redox couple O2/OHâ. Dissolved oxygen can greatly enhance the high-rate dischargeability of the alloy electrode. Specifically, in oxygen-containing electrolyte, the electrode delivers a reversible discharge capacity of 530Â mAh/g at 300Â mA/g and its discharge capacity is still up to 480Â mAh/g even at a high current density of 1200Â mA/g. However, in the case of the electrode in oxygen-free electrolyte, its discharge capacity is 438Â mAh/g at 300Â mA/g and is reduced to only 234Â mAh/g at 1200Â mA/g. Exchange current densities (i0) of the alloy electrode in oxygen-containing and oxygen-free electrolyte are 78Â mA/g and 54Â mA/g, respectively. The significant improvement in the high-rate dischargeability of the alloy electrode should be attributed to that oxygen reduction accelerates the kinetics of Co oxidation reaction.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Electroanalytical Chemistry - Volume 786, 1 February 2017, Pages 164-168
Journal: Journal of Electroanalytical Chemistry - Volume 786, 1 February 2017, Pages 164-168
نویسندگان
D.S. Lu, J.L. Li, Z.X. Chen, H.N. Zeng,