多元醇介导合成具有增强超级电容性能的介孔α-Ni(OH)2。

Polyol-mediated synthesis of mesoporous α-Ni(OH)2 with enhanced supercapacitance.

机构信息

Institute of New Energy Material Chemistry, Key Laboratory of Advanced Energy Materials Chemistry(MOE), Tianjin Key Lab of Metal and Molecule-based Material Chemistry, Nankai University, Tianjin 300071, P.R. China.

出版信息

ACS Appl Mater Interfaces. 2013 Jul 24;5(14):6643-8. doi: 10.1021/am401341h. Epub 2013 Jul 10.

DOI:10.1021/am401341h

PMID:23799889

Abstract

Flower-like α-Ni(OH)2 microspheres composed of nanowires are prepared by a solvothermal method using triethylene glycol and water as the mixed solvent. The formation of this unique structure is attributed to the synergetic effect of dissolution-recrystallization procedure, Ostwald ripening, and aggregative lateral attachment. Experimental results indicate that the dielectric constant, viscosity, and the chain lengths of the alcohols in the solvent may greatly affect the morphology and size of the as-obtained α-Ni(OH)2 samples. Because of the high Brunauer, Emmett, and Teller (BET) nitrogen sorption surface area of 318 m(2) g(-1) and large pore volume, this sample displays a maximum discharge specific capacity of 1788.9 F g(-1) at a discharge current density of 0.5 A g(-1). Besides, rate performance of this sample is also excellent, indicating that this sample is promising in electrochemical supercapacitors.

摘要

花状的α-Ni(OH)2 纳米线微球是通过溶剂热法，以三乙二醇和水的混合溶剂制备的。这种独特结构的形成归因于溶解-再结晶过程、奥斯特瓦尔德熟化和聚合横向附着的协同效应。实验结果表明，溶剂中的介电常数、粘度和醇的链长可能会极大地影响所获得的α-Ni(OH)2 样品的形态和尺寸。由于具有高的 Brunauer、Emmett 和 Teller（BET）氮气吸附比表面积 318 m2 g-1和大的孔体积，该样品在 0.5 A g-1 的放电电流密度下显示出 1788.9 F g-1 的最大放电比容量。此外，该样品的倍率性能也很优异，表明该样品在电化学超级电容器中有应用前景。