Synthesis and Electrochemical Properties of Sb<SUB>2</SUB>Se<SUB>3</SUB> Nanowires Prepared by a Gas Induced Reduction Method
作者:Xin Wang、Kefeng Cai、Song Chen
DOI:10.1166/jnn.2013.5982
日期:2013.2.1
Sb2Se3 nanowires have been prepared by a novel gas induced reduction (GIR) method. The precursor solution prepared by dissolving Sb2(OCH2CH2O)3 and SeO2 in a certain solvent was initially separated from the reductant, hydrazine hydrate. The reductant evaporated during the heating process, dissolved into the precursor solution and reacted with Sb3+ and SeO2 and finally Sb2Se3 nanostructures formed. Different solvents including diethanolamine, glycerol, ethylene glycol, deionized water, absolute ethanol and isopropyl alcohol were respectively used for comparison. It was found that when ethylene glycol was used as a solvent, pure, relatively homogeneous, and high aspect-ratio Sb2Se3 nanowires (40∼120 nm in diameter and ∼100 μm in length) were prepared. Growth mechanism of the Sb2Se3 nanowires was proposed. The electrochemistry character of the nanowires was investigated via assembling into lithium ion batteries. The discharge capacity of Sb2Se3/Li cell cycled between 0.3 and 2.5 V was performed in the range of 142∼1036 mA·h·g−1 during the first 30 cycles, with the charge/discharge efficiency increasing from 89.4% to 97.5%.
Sb2Se3纳米线通过一种新颖的气体诱导还原(GIR)方法制备。预CURSOR溶液通过将Sb2(OCH2CH2O)3和SeO2溶解在某种溶剂中制备,并最初与还原剂肼水合物分离。在加热过程中,还原剂蒸发,溶解在前驱体溶液中,与Sb3+和SeO2反应,最终形成Sb2Se3纳米结构。对乙醇胺、甘油、乙二醇、去离子水、无水乙醇和异丙醇等不同溶剂进行了比较。结果发现,当使用乙二醇作为溶剂时,制备出了纯、相对均匀且高纵横比的Sb2Se3纳米线(直径40∼120纳米,长度约100微米)。提出了Sb2Se3纳米线的生长机制。通过组装成锂离子电池,研究了纳米线的电化学特性。Sb2Se3/Li电池在0.3到2.5 V之间循环的放电容量在前30个循环中在142∼1036 mA·h·g−1范围内,充放电效率从89.4%提高到97.5%。