纳米棒
线性扫描伏安法
单斜晶系
高分辨率透射电子显微镜
材料科学
循环伏安法
化学工程
正交晶系
透射电子显微镜
热液循环
相(物质)
电催化剂
六角相
纳米材料
聚乙二醇
无机化学
电化学
纳米技术
化学
结晶学
晶体结构
有机化学
物理化学
电极
工程类
作者
Dong Jin Ham,Anukorn Phuruangrat,Somchai Thongtem,Jae Sung Lee
标识
DOI:10.1016/j.cej.2010.09.003
摘要
Monoclinic WO3 (m-WO3) nanoplates and nanorods were successfully synthesized by a simple hydrothermal process using sodium tungstate dihydrate (Na2WO4·2H2O), ammonium nitrate (NH4NO3) and polyethylene glycol (PEG) as initial precursors. Phase, morphologies and electrochemical properties of the products were characterized by X-ray diffraction (XRD), scanning and transmission electron microscopy (SEM, TEM), high-resolution transmission electron microscopy (HRTEM), cyclic voltammetry (CV) and linear sweep voltammetry (LSV). The effect of NH4NO3 concentration on the formation of the pure phase of m-WO3 nanomaterial was studied. The product synthesized under NH4NO3-free condition was pure orthorhombic WO3·0.33H2O (o-WO3·0.33H2O) phase. By adding and increasing the amount of NH4NO3 to the solution, m-WO3 phase started to form and became pure m-WO3 phase when 1.50 g NH4NO3 was used. The morphology of m-WO3 was nanoplates, and became nanorods by PEG adding. The nanostructured m-WO3 showed much higher electrocatalytic activity for hydrogen evolution from water than that of the commercial bulk m-WO3, including the m-WO3 nanorods with slightly better than the m-WO3 nanoplates.
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