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石墨烯由单层碳原子组成,具有大的比表面积和超高的导电性,广泛应用于催化与储能领域.本工作结合石墨烯独特的物理化学性质和结构特性,采用原位氧化还原法,以KMnO4和石墨烯(GNs)为原料合成GNs-MnO2氧还原催化剂,通过X射线衍射(XRD)、拉曼光谱(Raman)、透射电镜(TEM)、热重(TG)、BET等分析测试技术研究了纳米GNs-MnO2复合材料的微观结构特征.结果表明,合成的MnO2纳米线直接生长在石墨烯的表面,增加了MnO2的比表面积,提高了催化剂的活性位点.电化学测试表明,合成的GNs-MnO2催化剂在碱性介质中电催化氧还原电位比纯MnO2的氧还原电位正移80 mV,电流提高了1.3倍,在燃料电池氧还原电催化中有一定的应用前景.
Graphene consists of single-layer carbon atoms with large specific surface area and high electrical conductivity and is widely used in the field of catalysis and energy storage.Based on the unique physical and chemical properties and structural properties of graphene, graphene is characterized by in-situ redox The GNs-MnO2 oxygen reduction catalyst was synthesized from KMnO4 and graphene (GNs) by X-ray diffraction (Raman), transmission electron microscopy (TEM), thermal gravimetric analysis (TG) The results show that the synthesized MnO2 nanowires grow directly on the surface of graphene to increase the specific surface area of MnO2 and increase the active site of the catalyst.The electrochemical tests show that the nanocrystalline GNs- The electrocatalytic reduction potential of GNs-MnO2 catalyst in alkaline medium is 80 mV more positive than that of pure MnO2, and the current is 1.3 times higher than that of pure MnO2 catalyst. Therefore, GNt-MnO2 catalyst has certain application prospects in the oxygen reduction electrocatalysis of fuel cell.