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

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。

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

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.