中文摘要：

用沉淀法制备出作为全钒液流电池负极电催化材料的具有单斜结构的纳米氧化钨粉体材料,并用透射电镜（TEM）和X-射线衍射（XRD）进行了表征.将此纳米氧化钨粉体用Nafion溶液涂覆于玻碳电极上,在1.5mol/L V（Ⅲ）＋/1.5mol/L V（Ⅳ）＋6mol/L H2SO4的电解液中通过循环伏安法测试了V（Ⅱ）/V（Ⅲ）氧化还原反应的反应活性和可逆性.循环伏安数据显示了V（Ⅱ）/V（Ⅲ）氧化还原反应在涂覆有氧化钨粉体的玻碳电极表面的反应为扩散控制的准可逆过程,室温下该反应的标准速率常数为4.22×10^-6 m/s.

英文摘要：

Monoclinic tungsten oxide nanopowder as an electrocatalyst for V（ Ⅲ ）/V（ Ⅱ ） redox couple is prepared by precipitation method and characterized by transmission electron microscope （TEM） and X-ray powder Diffraction （XRD）. The electrochemical behavior of the V（ Ⅲ）/V（ Ⅱ ） redox couple has been investigated at tungsten oxide nanopowder coated glassy carbon electrode using cyclic voltamme- try （CV） in 1.5 mol/L V（]]I）/＋I. 5 mol/L V（IV）＋6 mol/L H2SO4 aqueous solution. CV experi- ments shows the presence of tungsten oxide nanopowder greatly improved the reversibility of the V（Ⅲ）/V（ Ⅱ ） redox reaction. The oxidation/reduction is found to be diffusion controlled quasi-reversible process with standard rate constant ks=4.22 × 10^-6 m/s at room temperature.