以纳米TiO2为载体,偏钨酸铵为钨源,经机械球磨后制备成WC/TiO2前驱体,将前驱体在900℃,甲烷/氢气气氛下碳化还原,获得了系列WC/TiO2纳米复合材料.采用XRD、SEM、HRTEM、STEM-Z衬度像、EDS-Mapping方法对样品的晶相、微观结构、化学成份及空间分布进行了系统表征;采用三电极体系粉末微电极方法测试了样品在碱性溶液中的电化学催化活性,结果表明:随着碳化还原时间的延长,样品中钨的物相由WO3→WO2→W→W2C、WC发生变化;碳化钨晶粒在20 nm以下且分布于载体TiO2表面;还原碳化6h样品电化学性能最佳,此时活性相以WC和W2C为主,晶粒最细且均匀分布于稳定的金红石载体表面.
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