Electrochemical impedance spectroscopy analysis for oxygen reduction reaction in 3.5% NaCl solution |
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Authors: | Fei Kuang Dun Zhang Yongjuan Li Yi Wan Baorong Hou |
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Affiliation: | (1) Institute of Oceanology, Chinese Academic of Sciences, 7 Nanhai Road, Qingdao, 266071, China;(2) Graduate School of the Chinese Academy of Sciences, 19 (Jia) Yuquan Road, Beijing, 100039, China |
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Abstract: | The electrochemical impedance spectroscopy (EIS) at different potentials has been used to study the oxygen reduction reaction (ORR) in 3.5% NaCl solution on glassy carbon (GC) electrode in this work. Results show that ORR consists of three two-electron reaction steps and both superoxide ion (O2 –) and hydrogen peroxide (H2O2), which are produced by ORR, obstruct the diffusion of oxygen to the surface of the electrode and make the EIS results change into a transmissive finite diffusion process with the real part contraction and a reflective finite diffusion process from a semi-infinite diffusion process. The values of electron transfer resistance (R t) and diffusion resistance (R d) were calculated from EIS. O2 – influenced strongly on the R t values and induced a maximum at −0.45 V. |
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Keywords: | Electrochemical impedance spectroscopy Oxygen reduction reaction 3.5% NaCl solution Cyclic voltammetry |
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