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有色金属工程:2020,(2):16-21
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复合材料Fe0.5Co0.25Ni0.25Ox-Ti4O7电极的制备及催化活性研究
李茂梅
(北京工业大学)
Preparation and Catalytic Activity of Composite Fe0.5Co0.25Ni0.25Ox-Ti4O7 Electrode
limaomei
(Beijing university of technology)
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投稿时间:2019-04-29    修订日期:2019-05-10
中文摘要: 采用光降解沉积法合成复合材料Fe0.5Co0.25Ni0.25Ox-Ti4O7电极,利用SEM-EDS、TEM观察电极材料的形貌、元素分布以及粉体的显微结构,电极材料呈多孔结构,铁、钴、镍氧化物按设计的摩尔比包覆在Ti4O7上,以高缺陷态存在;通过在0.1 mol/L KOH中的循环伏安测试(CV)和线性伏安扫描测试(LSV)测试,材料具有氧还原(ORR)和氧析出(OER)催化活性;以Fe0.5Co0.25Ni0.25Ox-Ti4O7为催化材料组装成有机体系的锂氧气电池,在100 mA/g条件下恒流充放电,电池首次放电比容量可达6 000 mAh/g,随后过程衰减较快;而在100 mA/g和800 mAh/g条件下恒流恒容充放电时,放电电压可保持在2.7 V以上稳定循环25圈。
Abstract:The composite material Fe0.5Co0.25Ni0.25Ox-Ti4O7 electrode was synthesized by photochemical metal-organic deposition (PMOD). Scanning electron microscope (SEM) combined with energy dispersive spectrometer (EDS) and transmission electron microscope (TEM) were used to confirm the morphology and element distribution of electrode materials and the microstructure of the sample powder. The electrode materials Fe0.5Co0.25Ni0.25Ox-Ti4O7 were porous, in which the FeOx, CoOx, and NiOx coated on Ti4O7 by the designed molar ratio and existed in the state of high defect density. The cyclic voltammetry (CV) and linear voltammetry (LSV) tests in 0.1 mol/L KOH electrolyte were performed. The materials have oxygen reduction (ORR) and oxygen precipitation (OER) catalytic activities. Aprotic lithium oxygen batteries were assembled with Fe0.5Co0.25Ni0.25Ox-Ti4O7 materials. The constant current charge and discharge at 100 mA/g, an initial discharge specific capacity of the batteries can reach more than 6 000 mAh/g and the subsequent process decays faster. The batteries can maintain discharge voltage stable above 2.7 V 25 circles under the conditions of the constant current of 100 mA/g and the constant capacity of 800 mAh/g.
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基金项目:国家自然科学基金资助项目(51472009);内蒙古自治区自然科学基金项目(2015MS0516)
引用文本:
李茂梅.复合材料Fe0.5Co0.25Ni0.25Ox-Ti4O7电极的制备及催化活性研究[J].有色金属工程,2020,(2):16-21.

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