铂纳米晶的合成及其甲醇电催化性能  

Synthesis of Platinum Nanocrystallites and Possible Electrocatalytic Properties for Methanol

作　　者：路蕾蕾[1] 杜宝中[1] 孙莎[1] 钮金芬[1] 赵洁[1] 

机构地区：[1]西安理工大学理学院应用化学系,陕西西安710048

出　　处：《电化学》2014年第2期171-176,共6页Journal of Electrochemistry

基　　金：高等学校博士学科点专项科研基金(No.20116118120017);陕西省教育厅科研计划项目(No.2010JK752);西安理工大学博士启动基金(No.108210911)资助

摘　　要：以草酰胺作为保护剂，采用胶体法合成铂纳米晶，考察了不同溶液pH值、前驱体与保护剂反应物配比对铂纳米晶形貌及其甲醇电催化氧化活性的影响．测试表明，pH=5、反应物配比1：20合成的铂纳米晶的甲醇电催化氧化活性最佳，其峰电流密度达到1709v-A·cm-2．空气中搁置3个月后，其表面形貌变化不大，但甲醇的电催化活性显著降低．0．05～1．2V电位范围循环扫描100周期，其循环伏安曲线明显变化，晶体表面原子排列方式也发生变化，由易毒化（100）面逐渐转化为（110）面，其甲醇电催化活性增加．Platinum nanocrystallites were synthesized by the colloidal method using oxamide as the stabilizer. The morphologies and electrocatalytic performances for methanol of platinum nanocrystallites prepared at different pH values and with different reactant ratios of precursor and stabilizer were investigated. It was found that the platinum nanocrystallites synthesized at pH=5 and with the reactant ratio of 1：20 showed the best electrocatalytic activity for methanol. The peak current density reached up to 1709 μA·cm-2. Furthermore, the electrocatalytic activity of platinum nanocrystallites for methanol reduced significantly although the cyclic voltammograms in the blank solution were not obviously changed after exposing in air for 3 months. However, the curves changed significantly after sweeping for I00 cycles in the potential region of 0.05 - 1.2 V, indicating that the atomic arrangement of crystal surface had been changed. The easily poisoned （100） surface was gradually transformed to the more active （110） surface, resulting in the increase of electrocatalytic activity for methanol.

关 键 词：铂纳米晶 草酰胺 直接甲醇燃料电池 电催化 

分 类 号：TQ138.26[化学工程—无机化工]