模板法制备氮掺杂多孔碳材料氧还原性能研究

Research on the oxygen reduction performance of nitrogen-doped porous carbon materials prepared by template method

以水溶性盐NaCl和Na2SiO3为双重模板,以葡萄糖为碳源,尿素为氮源,通过冷冻干燥以及随后的热解过程,合成了具有分级多孔结构的氮掺杂碳纳米片作为高效的氧还原催化剂,并探究了不同模板剂对碳纳米片性能的影响.结果表明,以NaCl和Na2SiO3为模板可使碳源、氮源分散,形成具有较大比表面积和分级多孔结构的碳纳米片.这种结构不但有利于提高催化剂和电解质的有效接触面积,促进氧分子的扩散,缩短电催化过程中电子和离子的传输路径,还有助于产生更多的活性位点,提高氧还原催化性能.

Using water-soluble salts NaCl and Na2SiO3 as dual templates,glucose as carbon source and urea as nitrogen source,3D nitrogen-doped carbon nanosheets with graded porous structure were synthesized as efficient oxygen reduction catalyst through freeze drying and subsequent pyrolysis process,and the effects of different template agents on the performance of carbon nanosheets were explored.The results show that using NaCl and Na2SiO3 as templates can disperse the carbon and nitrogen sources and prevent their aggregation,forming carbon nanosheets with large specific surface area and fractional porous structure.This structure is not only beneficial to improve the effective contact area of catalyst and electrolyte,promote the diffusion of oxygen molecules,shorten the transport path of electrons and ions in the electrocatalytic process,but also helpful to produce more active sites and improve the catalytic performance of oxyen reduction.