文档介绍：
制备条件对氧化铈甲醇电氧化助催化作用
的影响#
路蕾蕾,杜宝中*
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(西安理工大学应用化学系)
摘要:采用水热法合成纳米氧化铈,通过 Pt-CeO2 复合膜电极的甲醇电催化氧化活性对氧化
铈的制备条件进行了优选。选用助催化效果最佳的氧化铈作为基体,采用胶体法制备 Pt-CeO2
复合催化剂,采用循环伏安法研究了其对甲醇的电催化活性,并考察了不同 pH 对其电催化
活性的影响。研究发现,当反应时间和配比一定时,反应的温度越高,其得到的纳米氧化铈
的粒径越小;反应温度 150℃,反应时间 12 h,沉淀剂与六水硝酸铈的配比为 4 : 1 时合成的
氧化铈在 Pt-CeO2 复合膜电极中的助催化效果最佳。胶体法制备的 Pt-CeO2 复合催化剂的催
化活性远高于同条件下制备的纯 Pt 纳米晶,且 pH 5 时复合催化剂的催化活性最佳,达到纯
Pt 纳米晶的 倍。
关键词:电化学;铂纳米晶;氧化铈;电催化;直接甲醇燃料电池
中图分类号:O646
Influence of CeO2 synthesis conditions on its cocatalytic
effect on methanol electrooxidation
LU Leilei, DU Baozhong
(Xi’an University of Technology, Institute of Applied Chemistry)
Abstract: Nano-CeO2 was prepared by hydrothermal method and the conditions were optimized
by considering its co-catalytic performances for methanol in Pt-posite membrane
electrode. Pt-posite catalysts were synthesized by colloidal method using CeO2 showing
the best promoting effect as co-catalyst. Cyclic Voltammetry (CV) was employed to evaluate the
electrocatalytic activity of Pt-posite catalysts for methanol oxidation prepared under
different pH values. The results showed that smaller size nano-CeO2 was obtained when the
reaction temperature is relative higher with certain reaction time and reactant ratio. The best
methanol electrocatalytic performance was gained with CeO2 prepared under 150 ℃, reaction
time 12 h and