β-氢氧化镍结构及其复合电极电催化性能研究

Structures of β-Nickel Hydroxide and Electrocatalytical Properties of Complex Electrode

采用沉淀转化法制备纳米结构β-氢氧化镍,用X射线衍射(XRD)、比表面仪(BET)、场发射扫描电子显微镜(FE-SEM)、透射电子显微镜(TEM)等进行结构和形貌表征.结果显示,所得β-氢氧化镍呈片状和棒状的混合纳米结构,片层厚度约为35 nm,棒长为50～80 nm,且比表面积约为68 m2/g.用线性电位扫描对β-氢氧化镍与二氧化锰复合电极的电催化性能进行研究,发现含有10%MnO2/10%Ni(OH)2的催化材料,在-0.7 V(vs.SCE)的极化电位下可获得约87 mA/cm2的电流密度,与单一的MnO2催化材料(约68 mA/cm2)相比有更佳的催化活性.

Nanostructured β--nickel hydroxide powder is synthesized by a precipltate-transformation method. The structure and the morphology of the synthesized products are studied by X-ray diffraction （XRD）, BET surface area, field emission scaning electron microscope （FE-SEM）, Transmission electron microscope （TEM）. Experimental results show that β--nickel hydroxide submits a mixed structure of nanosheets and nanorods, the thickness of the sheet is about 35 nm, and the length of the rod is in 50-80 nm. The specific surface area is about 68 m^2/g. The electrocatalytical properties of the complex electrode consisted of β-nickel hydroxide and manganese dioxide are studied by using the linear potential sweep. It is found that the current density of positive materials including 10%MnO2/10%Ni（OH）2is about 87 mA/cm^2 at- 0.7 V（vs. SCE）. Compared with single manganese dioxide positive materials （about 68 mA/cm^2） it has better electrocatalytical properties.