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通过改进的置换反应,以三维网状结构泡沫镍为基底,制备了新型多孔Ag/Ni复合泡沫金属材料(Ag@Ni泡沫金属)。X射线衍射(XRD)、扫描电子显微镜(SEM)和X射线能谱(EDS)表明,泡沫镍基底上生成的金属Ag颗粒呈枝晶状且分布均匀。将其作为集流体首次应用于锂空气一次电池正极,通过线性伏安扫描(LSV)、电化学阻抗(EIS)和充放电测试研究了电极的电化学性能,结果表明,这种Ag@Ni泡沫金属作为锂空气一次电池的氧气极集流体,明显提高了还原反应的催化活性,改善了电化学反应性能,电流密度0.1 mA/cm2时,放电电压平台从2.66升高到2.73 V,容量也由2000 mAh/g增大到2750 mAh/g,且大电流密度下改善更为明显。
A novel porous Ag / Ni composite foam metal (Ag @ Ni foamed metal) was prepared by the improved displacement reaction based on the three-dimensional network structure of nickel foam. X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS) showed that Ag particles formed on the foamy nickel substrate were dendritic and uniformly distributed. The electrochemical performance of the electrode was investigated by linear voltammetric scanning (LSV), electrochemical impedance spectroscopy (EIS) and charge-discharge test. The results showed that the Ag @ Ni foam As a cathode current collector of lithium-air primary battery, the catalytic activity of the reduction reaction was significantly improved and the electrochemical reaction performance was improved. When the current density was 0.1 mA / cm2, the discharge voltage increased from 2.66 to 2.73 V, 2000 mAh / g increased to 2750 mAh / g, and the improvement of high current density is more obvious.