活性炭载碳化钨复合材料的制备及其对对硝基苯酚的电催化性能

Preparation and electrocatalytic activity of WC/C composite for p-nitrophenol electroreduction

以浓度为10%的偏钨酸铵溶液为前驱体、CH4/H2为还原碳化气氛,采用表面修饰技术和还原碳化技术制备了碳化钨(WC)/活性炭(C)复合材料。通过FT-IR、XRD、SEM等对制备的WC/C材料进行表征,结果表明,酸处理后的活性炭外表面大幅度增加了羟基和羰基,WC/C复合材料是由WC、W2C和C三相组成,碳化钨均匀地分散于活性炭表面,粒径约50～100nm。采用循环伏安法研究了碱性介质中WC/C-PME对对硝基苯酚的电还原行为,结果表明,该材料对对硝基苯酚的电催化活性优于WC和C,且WC/C材料在对硝基苯酚电还原过程中保持良好的化学稳定性。

With 10%（mass） ammonium metatungstate（AMT）as precursor,tungsten carbide（WC）/active carbon（C）composite was prepared by surface decoration and in situ reduction techniques in the atmosphere of CH4/H2.The samples were characterized by FT-IR,XRD and SEM.The results showed that hydroxyl and carbonyl functional groups on the outer surface of active carbon were significantly increased after acid treatment,and the sample WC/C composite was composed of WC,C and W2C,and tungsten carbide was supported on the outer surface of active carbon uniformly,with the particle size of 50—100 nm.The electrocatalytical activity and electrochemical stability of WC/C,WC,C for the eletroreduction of p-nitrophenol were investigated by cyclic voltammetry.The results showed that WC/C exhibited better catalytic activity for the eletroredution of p-nitrophenol than WC and C,and it also had good electrochemical stability during the process of eletroredution of p-nitrophenol in alkalic solution.