直接和间接电合成制备出的高铁酸钾的物理和电化学性能

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直接和间接电合成制备出的高铁酸钾的物理和电化学性能

徐志花^a; 王建明^a; 邵海波^a ; 张鉴清^a,b

^a Department of Chemistry, Zhejiang University, Hangzhou 310027, China
^b Chinese State Key Laboratory for Corrosion and Protection, Shenyang 110015, China

收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2007-02-28 发布日期:2007-02-28
通讯作者: 徐志花

Physical properties and electrochemical performance of solid K2FeO4 samples prepared by ex-situ and in-situ electrochemical methods

XU Zhihua^a; WANG Jianming^a; SHAO Haibo^a; ZHANG Jianqing^a,b

^a Department of Chemistry, Zhejiang University, Hangzhou 310027, China
^b Chinese State Key Laboratory for Corrosion and Protection, Shenyang 110015, China

Received:1900-01-01 Revised:1900-01-01 Online:2007-02-28 Published:2007-02-28
Contact: XU Zhihua

摘要/Abstract

摘要： K2FeO4 powders were synthesized by the ex-situ and in-situ electrochemical methods, respectively, and characterized by infrared spectrum (IR), scanning electron microscopy (SEM), X-ray powder diffraction (XRD) and BET. Their electrochemical performances were investigated by means of galvanostatic discharge and electrochemi-cal impedance spectroscopy (EIS). The results of physical characterization showed that the two samples have simi-lar structural features, but their surface morphologies and oriented growth of the crystals are different, which results in smaller specific surface area and lower solubility of the ex-situ electrosynthesized K2FeO4 sample. The results of discharge experiments indicated that the ex-situ electrosythesized K2FeO4 electrode has much larger discharge ca-pacity and lower electrode polarization than the in-situ electrosynthesized K2FeO4 electrode. It was found from the results of EIS that lower electrochemical polarization might be responsible for the improvement on the discharge performance of the ex-situ electrosynthesized K2FeO4 electrode.

关键词: K2FeO4;electrosynthesis;discharge performance;electrochemical impedance spectroscopy (EIS)

Abstract: K2FeO4 powders were synthesized by the ex-situ and in-situ electrochemical methods, respectively, and characterized by infrared spectrum (IR), scanning electron microscopy (SEM), X-ray powder diffraction (XRD) and BET. Their electrochemical performances were investigated by means of galvanostatic discharge and electrochemi-cal impedance spectroscopy (EIS). The results of physical characterization showed that the two samples have simi-lar structural features, but their surface morphologies and oriented growth of the crystals are different, which results in smaller specific surface area and lower solubility of the ex-situ electrosynthesized K2FeO4 sample. The results of discharge experiments indicated that the ex-situ electrosythesized K2FeO4 electrode has much larger discharge ca-pacity and lower electrode polarization than the in-situ electrosynthesized K2FeO4 electrode. It was found from the results of EIS that lower electrochemical polarization might be responsible for the improvement on the discharge performance of the ex-situ electrosynthesized K2FeO4 electrode.

Key words: K2FeO4, electrosynthesis, discharge performance, electrochemical impedance spectroscopy (EIS)

徐志花, 王建明, 邵海波, 张鉴清 . 直接和间接电合成制备出的高铁酸钾的物理和电化学性能[J]. , DOI: .

XUZhihua,WANGJianming, SHAOHaibo, ZHANG Jianqing a,b . Physical properties and electrochemical performance of solid K2FeO4 samples prepared by ex-situ and in-situ electrochemical methods[J]. , DOI: .

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