电化学自组装Fe/Cu纳米复合材料对铁镍电池高倍率及低温性能改性
Electrochemically Self-Assembled Fe/Cu Nanocomposite with Improved High-Rate and Low-Temperature Performances for Nickel-Iron Alkaline Battery
作者单位E-mail
刘平 四川大学材料科学与工程学院, 成都 610065  
朱丁 四川大学新能源与低碳技术研究院, 成都 610065 zhuding@scu.edu.cn 
杨军 四川大学材料科学与工程学院, 成都 610065  
黄兰香 四川大学材料科学与工程学院, 成都 610065  
陈云贵 四川大学材料科学与工程学院, 成都 610065 ygchen60@aliyun.com 
摘要: 通过在碱液中阴极还原铁酸铜(t-CuFe2O4)简便地实现了纳米Fe/Cu复合材料的自组装。采用循环伏安(CV)与X射线衍射(XRD)分析了自组装过程中的相变。通过透射电镜(TEM)、选区电子衍射(SAED)以及扫描透射-能谱分析(STEM-EDX)的表征可以发现电结晶得到的铁、铜纳米颗粒分布均匀且接触紧密。当用于铁镍电池负极时,Fe/Cu纳米复合电极展现了较好的放电容量与充电接收能力,并具备优异的高倍率与低温性能。当电流密度高达4 500 mA·gFe-1或运行温度仅为-40℃时,该电极仍拥有很好的输出容量与电位特性。线性扫描伏安(LSV)分析证明了该电极中原位生成的Cu纳米颗粒催化了活性Fe的阳极溶解动力学性能,因而明显改善了电极的高倍率与低温放电性能。
关键词: 铁酸铜  自组装  纳米复合材料  铁电极  高倍率与低温性能
基金项目: 四川省科技支撑计划(No.2015GZ0133)资助项目。
Abstract: Fe/Cu nanocomposite was simply self-assembled through the cathodic decomposition of tetragonal spinel CuFe2O4 (t-CuFe2O4) in alkaline solution. The phase transition from t-CuFe2O4 to Cu/Fe3O4, and eventually to Fe/Cu composite was monitored by cyclic voltammetry (CV) and X-ray powder diffraction (XRD). Transmission electron microscope (TEM), selected area electron diffraction (SAED) and scanning TEM-energy dispersive X-ray (STEM-EDX) observations showed that the electro-crystallized copper and iron nanoparticles dispersed homogeneously and contacted intimately. When the Fe/Cu nanocomposite electrode was tested as the anode for nickel-iron (Ni-Fe) rechargeable battery, it exhibited enhanced discharge capacity, charge-acceptance and especially remarkable high-rate and low-temperature performances. Excellent capacity output and potential characteristics were achieved at high discharge current density (4 500 mA·gFe-1) or low operation temperature (-40℃), respectively. Linear scanning voltammetry (LSV) analyses demonstrated that the incorporation of in situ formed copper facilitated the anodic kinetics of active iron, resulting to the markedly enhanced high-rate and low-temperature discharge-ability of electrode.
Keywords: copper ferrite  self-assembly  nanocomposite  iron alkaline electrode  high-rate and low temperature performance
投稿时间:2016-12-29 修订日期:2017-03-11
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刘平,朱丁,杨军,黄兰香,陈云贵.电化学自组装Fe/Cu纳米复合材料对铁镍电池高倍率及低温性能改性[J].无机化学学报,2017,33(5):779-786.
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