| 纳米钙钛矿型LaFe1-xNixO3(x=0~1.0)的制备及其在紫外光激发下的电化学性能 |
| Preparation of Nano-Crystalline Perovskite-Type LaFe1-xNixO3(x=0~1.0) and the Electrochemical Properties under UV Excitation |
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| 摘要: 本文采用溶胶-凝胶法制备了LaFe1-xNixO3(x=0，0.2，0.4，0.6，0.8，1.0)纳米晶粉末，利用XRD、TEM和电化学测试方法对LaFe1-xNixO3材料的相结构、形貌、成分组成和其在碱液中的充放电性能以及电化学动力学性能等方面进行了表征和分析，同时对电极受紫外光激发前后的电化学行为进行了对比研究。XRD和TEM分析表明，用硝酸盐作为原材料和溶胶-凝胶方法可制备出单一相结构的纳米晶钙钛矿型LaFe1-xNixO3复合氧化物，随Ni替代量x的增大，LaFe1-xNixO3的相结构由正交结构向菱面体结构转变，其分子体积和晶粒尺寸呈现减小的趋势。电化学研究结果表明，紫外光激发前，LaFe1-xNixO3电极的放电容量随x的增加而逐渐增大；光激发后，电极的放电容量和交换电流Io与未激发前相比显著提高，当x=0.4时其放电容量具有最大值483.1 mAh·g-1，Io值由光激发前的3.54~11.58 mA·g-1大幅增加至激发后的8.37~ 40.11 mA·g-1。 |
| 关键词: LaFe1-xNixO3 紫外光激发 电化学性能 |
| 基金项目: |
| Abstract: LaFe1-xNixO3(x=0, 0.2, 0.4, 0.6, 0.8, 1.0) nano-crystalline powders were synthesized by sol-gel method. The phase structure, morphology and composition of the LaFe1-xNixO3 were characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM). The charge-discharge performance and electrochemical kinetics properties of the oxides in alkaline solution were characterized by electrochemical methods, meanwhile the electrochemical behavior of the electrodes before and after UV excitation was comparatively studied. It was found that single phase nano-crystalline perovskite-type LaFe1-xNixO3 composite oxides was obtained by sol-gel method with nitrate as raw materials. As the substitute amount x increasing, the phase structures of LaFe1-xNixO3 transform from orthorhombic to rhombohedral type, the both molecular volumes and the grain sizes decreased. Electrochemical experimental results show that, with increasing x of Ni doping, the discharge capacity of LaFe1-xNixO3 electrodes increased gradually before the UV excitation, while the discharge capacity and the exchange current density Io significantly enhanced under visible light irradiation. After the UV excitation, the largest discharge capacities could be up to 483.1 mAh·g-1 and the exchange current density Io increased by a wide margin from 3.54~11.58 mA·g-1 before the UV excitation to 8.37~40.11 mA·g-1. |
| Keywords: LaFe1-xNixO3 UV excitation electrochemical performance |
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| 胡合合,罗永春,康 龙,张国庆,齐文娟.纳米钙钛矿型LaFe1-xNixO3(x=0~1.0)的制备及其在紫外光激发下的电化学性能[J].无机化学学报,2012,28(10):2130-2138. |
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