| 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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| 引用本文： | 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].中国化学工程学报,2007,15(1):39-43. |
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| 作者姓名： | 徐志花 王建明 邵海波 张鉴清 |
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| 作者单位： | [1]Department of Chemistry, Zhejiang University, Hangzhou 310027, China [2]Chinese State Key Laboratory for Corrosion and Protection, Shenyang 110015, China |
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| 基金项目： | Supported by the National Natural Science Foundation of China （No.50172041） and partly by the Chinese State Key Laboratory for Corrosion and Protection. |
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| 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 electrochemical 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 capacity 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.
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| 关 键 词： | 高铁酸钾 固体样本 电化学合成 物理性质 放电性能 阴极材料 |
| 收稿时间： | 29 December 2005 |
| 修稿时间： | 2005-12-292006-05-30 |
Physical properties and electrochemical performance of solid K2FeO4 samples prepared by ex-situ and in-situ electrochemical methods |
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| XU ,Zhihua, ,WANG ,Jianming,SHAO ,Haibo,ZHANG Jianqing.Physical properties and electrochemical performance of solid K2FeO4 samples prepared by ex-situ and in-situ electrochemical methods[J].Chinese Journal of Chemical Engineering,2007,15(1):39-43. |
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| Authors: | XU Zhihua WANG Jianming SHAO Haibo ZHANG Jianqing |
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| Affiliation: | Department of Chemistry, Zhejiang University, Hangzhou 310027, China ;2,Chinese State Key Laboratory for Corrosion and Protection, Shenyang 110015, China |
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| Abstract: | K_2FeO_4 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. |
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| Keywords: | K_2FeO_4 electrosynthesis discharge performance electrochemical impedance spectroscopy (EIS) |
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