不同温度烧制介孔碳作为直接甲醇燃料电池催化剂载体

以嵌段共聚物P123为模板制备介孔氧化硅SBA-15, 并以此SBA-15为模板, 以蔗糖为碳源在不同的温度下(600-900 °C)制备介孔碳CMK-3. 采用浸渍还原法, 以硼氢化钠为还原剂, 制备介孔碳载Pt电催化剂, 即20% (w) Pt/CMK-3. 利用循环伏安法(CV)、计时电流法等测试电催化剂对甲醇的催化氧化性能及稳定性. 预吸附单层CO溶出伏安法研究测试催化剂抗CO中毒能力. 结果表明在烧制温度为900 °C时制备的介孔碳载Pt催化剂具有最好的催化性能和稳定性, 而在烧制温度为700 °C时制备的介孔碳载Pt催化剂对CO有较低的溶出电位.

Preparation of Mesoporous Carbon at Different Temperatures as a Catalyst Support for Direct Methanol Fuel Cells

Using mesoporous SiO2(SBA-15) as templates and sugar as a carbon precursor,mesoporous carbon(CMK-3) was prepared at different temperatures(600-900 ℃).20%(w) Pt/CMK-3 was then prepared by impregnation reduction with sodium borohydride as a reductant.Cyclic voltammetry(CV) and chronoamperometry were applied to study the catalytic performance and stability toward methanol oxidation for the as-prepared catalyst.CO striping voltammetry was used to determine its anti-poisoning capability toward CO.The results show that the Pt/CMK-3 prepared at 900 ℃ had the best catalytic performance and stability toward methanol but at a carbonization temperature of 700 ℃ the Pt catalyst had a lower stripping potential to CO.