摘要
采取水合肼还原法制备氧化亚铜(Cu2O)纳米粉体,通过掺杂稀土元素La对Cu2O进行改性,制备La掺杂的Cu2O八面体晶体材料。运用X射线衍射(XRD)和扫描电镜(SEM)对纳米材料的晶体组成和形貌特征进行了表征,添加了La、Ce掺杂的Cu2O表面生成了鳞片状的氧化铜。粒度分析表明La的添加使Cu2O的晶粒得到细化。探究改性后的Cu2O的光催化性能和作为锂离子电池负极电极材料的电化学性能。添加了3%La-Cu2O放电比容量为392mAh/g,充电比容量为440 mAh/g,库伦效率为89%,当电流密度从7.5A/g降低到0.1A/g,比容量会恢复到300m Ah/g;添加了3%La-Cu2O在自然光照射下,4 h的降解率达到45%。
Preparation of cuprous oxide( Cu2 O) nano powder by hydrazine hydration reduction method, modified Cu2 O by doping rare earth elements La,, La doped Cu2 O octahedral crystal materials were prepared. X-ray diffraction(XRD) and scanning electron microscopy(SEM) were used to characterize the crystal composition and morphology of the nanomaterials, and La added Cu2 O surface formed scaly copper oxide. Particle size analysis shows that the addition of La refines the grains of Cu2 O. The photocatalytic performance of modified Cu2 O and the electrochemical performance as a negative electrode material for lithium ion batteries were investigated. 4% La-Cu2 O added for the first time has a specific discharge capacity of 769 m Ah/g, a specific charge capacity of 418 m Ah/g, and a Coulomb efficiency of 55%. When the current density is reduced from 7.5 A/g to 0.1 A/g, the specific capacity will return to 355 m Ah/g. The degradation rate of 3% La-Cu2 O under natural light reached 45% in 4 h.
作者
孙君龙
Sun Junlong(Ocean University of China,Shandong Qingdao,266100)
出处
《云南化工》
CAS
2020年第4期79-82,共4页
Yunnan Chemical Technology
关键词
氧化亚铜
稀土元素
水合肼还原法
光催化性能
电化学性能
Cu2O
Rare earth element
Hydrazine hydrate reduction method
Photocatalytic peformance
Electrochemical performance
