碳载水滑石复合电极材料的制备及其性能的研究

Preparation and property of carbon-supported hydrotalcites composite electrode materials

利用水热法制备碳载水滑石(Ni Fe-LDH/石墨毡)复合电极材料,联合空气阴极燃料电池催化络合铁的氧化。与普通石墨毡相比,水滑石电极具有氧化速率快,电池中Fe^(2+)浓度转化速率加快了44.4%。采用扫描电子显微镜(SEM)、X-射线衍射仪(XRD)、X-射线光电子能谱仪(XPS)、扫描电化学显微镜(SECM)、循环伏安(CV)以及计时电势法对NiFe-LDH/石墨毡复合电极进行表征。结果表明,NiFe-LDH/石墨毡复合电极均匀负载在碳纤维上,颗粒均匀,晶型结构为片状,同时在催化Fe^(2+)浓度转化率方面具有更好效果,因此,NiFe-LDH/石墨毡复合电极广泛应用于燃料电池中。

The carbon-supported hydrotalcites（ Ni Fe-LDH/graphite felt） composite electrode materials are prepared via hydrothermal method,and then combined with air cathode fuel cell to catalyze the oxidation of complex iron.Compared with the conventional graphite felt,the hydrotalcite electrode supplies faster oxidation speed and accelerates the concentration conversion rate of Fe^2＋ in the battery by 44. 4%. The Ni Fe-LDH/graphite felt composite electrodes are characterized by scanning electron microscope（ SEM）,X-ray diffraction（ XRD）,X-ray photoelectron spectroscopy（ XPS）,scanning electrochemical microscopy（ SECM）,cyclic voltammetry（ CV） and chronopotentiometry.The results show that the Ni Fe-LDH/graphite felt composite electrodes are evenly loaded on the carbon fiber,the particles are homogeneous and the crystal structure is lamellar.The electrodes have better effect on the concentration conversion rate of Fe^2＋.Therefore,Ni Fe-LDH/graphite felt composite electrodes are widely applied in fuel cell.