摘要
用电沉积法制备掺杂La的Ni(OH)2超级电容器材料。通过XRD对掺杂La的Ni(OH)2进行结构表征,并采用三电极体系模拟电池对其电化学性能进行研究。研究结果表明:Ni(OH)2和La(OH)3的沉积过程主要受电化学极化控制,有利于获得均匀细致的结晶,且La(OH)3没有单独成相,可能是以La3+形式掺杂在了Ni(OH)2的晶格中。当Ni(NO3)2(0.5M)∶La(NO3)2(0.25M)=9∶1(体积比)时,掺杂La的Ni(OH)2电极材料的放电容量最大,可达到840 F.g-1,且循环可逆性较好。当以1000 mA.g-1放电时也能达到670 F.g-1。
Lanthanum doping nickel hydroxide sam- pies were prepared by electrodeposition method. The structure characteristics of the compounds were ana- lyzed by X-ray diffraction. Its electrochemical perfor- mances were studied by means of tri-electrode system laboratory cell. The results showed that the deposition process of Ni （OH）2 and La （OH）3 was mainly con- trolled by electrochemical polarization. Therefore, it was easy to form uniform not a separate phase, Ni（OH）2 lattice as La^3＋ crystals, and La（OH）3 was but maybe doping in the ions. When V （0.5 mol·L^- l Ni（NO3）2） ： V（0.25 mol·L^-1 La（NO3）2） = 9： 1, lan-thanum doping nickel hydroxide had higher discharge capability, 840 F·g^-1, and good cyclic reversibility. When the discharge current was 1000 mA·g^-1, the capability was 670 F·g^-1.
出处
《中国稀土学报》
CAS
CSCD
北大核心
2008年第3期331-334,共4页
Journal of the Chinese Society of Rare Earths
基金
河北省自然科学基金资助项目(B2008000758)
关键词
NI(OH)2
镧
掺杂
超电容
电沉积
稀土
nickel hydroxide
lanthanum
doping
super-capacitance
electrodeposition
rare earths
