碳包覆LaFeO3的合成及其在碱性溶液中的电化学性能

doi:10.3724/SP.J.1077.2012.12171

无机材料学报 ›› 2012, Vol. 27 ›› Issue (12): 1243-1250.DOI: 10.3724/SP.J.1077.2012.12171 CSTR: 32189.14.SP.J.1077.2012.12171

碳包覆LaFeO₃的合成及其在碱性溶液中的电化学性能

齐文娟¹, 罗永春^1,2, 康龙¹, 张国庆¹

(兰州理工大学1. 材料学院; 2. 甘肃省有色金属新材料省部共建国家重点实验室, 兰州 730050)

收稿日期:2012-03-19 修回日期:2012-05-22 出版日期:2012-12-20 网络出版日期:2012-11-19
作者简介:齐文娟(1985–), 女, 硕士研究生. E-mail: sunnygril_1228@163.com
基金资助:
国家自然科学基金(50941019); 甘肃省教育厅科研项目(21063008)

Synthesis of Carbon-coated LaFeO₃ and Electrochemical Properties of the Composites in Alkaline Solution

QI Wen-Juan¹, LUO Yong-Chun^1,2, KANG Long¹, ZHANG Guo-Qing¹

(1. College of Materials Science and Engineering , Lanzhou University of Technology, Lanzhou 730050, China; 2. State Key Laboratory of Gansu Advanced Non-Ferrous Metal Materials, Lanzhou University of Technology, Lanzhou 730050, China)

Received:2012-03-19 Revised:2012-05-22 Published:2012-12-20 Online:2012-11-19
About author:QI Wen-Juan. E-mail: sunnygril_1228@163.com
Supported by:
National Natural Science Foundation of China (50941019); Scientific Research Project of Gansu Province Education office (21063008)

摘要/Abstract

摘要： 采用溶胶–凝胶法合成了LaFeO₃, 并以蔗糖为碳源, 通过热处理方法合成了不同碳包覆量的LaFeO₃/C复合材料. 采用XRD、SEM和电化学性能测试等分析方法对所制备材料的结构、表面形貌和电化学性能进行了研究, 利用Raman光谱和TEM分析材料中碳的存在状态. 结果表明, 不同碳含量的LaFeO₃/C复合材料均为正交晶系的钙钛矿结构, 蔗糖经高温分解后在LaFeO₃颗粒表面和颗粒间形成的包覆层为非晶碳; 电化学分析表明, 碳包覆LaFeO₃的电化学性能优于未包覆的LaFeO₃, 其中碳含量为5wt%的材料电化学性能最好, 首次放电容量最高可达390 mAh/g. 碳包覆对LaFeO₃/C电极的交换电流密度I0影响较大, 随碳包覆量增加, I0值增大, 但碳包覆对LaFeO₃/C电极的离子扩散系数影响不明显.

关键词: 溶胶–凝胶法, 碳包覆, LaFeO₃, 电化学性能

Abstract: LaFeO₃ nanostructure powders oxide was synthesized by sol-gel method and then LaFeO₃/C composite materials containing different amounts of carbon were prepared by heat treatment using sucrose as a carbon source. The crystal structure, surface morphologies and electrochemical properties of the obtained composites coated with various carbon contents were investigated by the techniques of XRD, SEM, TEM, Raman spectroscope and electrochemical method. It was found that single phase nanostructure with perovskite-type LaFeO₃ was obtained by Sol-Gel method and the crystal structure of LaFeO₃/C could not be changed after coating carbon. Under high temperature, sourose was decomposed into amorphous carbon, which coated on the surface of LaFeO₃ particles and formed network-like structure between LaFeO₃particles. Electrochemical measurements showed that the carbon- coated composites were superior in the electrochemical performance to the LaFeO₃. LaFeO₃/C electrodes possessed high discharge capacities, among which the sample adding with 5wt% carbon had the largest discharge capacity of 390 mAh/g. With increasing amount of carbon coated, the exchange current density I₀ significantly enhanced, while effect of the coated carbon on the diffusion coefficient of ions was not obvious.

Key words: Sol-Gel, carbon-coating, LaFeO₃, electrochemical properties

中图分类号:

TG139

齐文娟, 罗永春, 康龙, 张国庆. 碳包覆LaFeO₃的合成及其在碱性溶液中的电化学性能[J]. 无机材料学报, 2012, 27(12): 1243-1250.

QI Wen-Juan, LUO Yong-Chun, KANG Long, ZHANG Guo-Qing. Synthesis of Carbon-coated LaFeO₃ and Electrochemical Properties of the Composites in Alkaline Solution[J]. Journal of Inorganic Materials, 2012, 27(12): 1243-1250.

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碳包覆LaFeO₃的合成及其在碱性溶液中的电化学性能

Synthesis of Carbon-coated LaFeO₃ and Electrochemical Properties of the Composites in Alkaline Solution

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