NiO增强Pt/C催化剂催化氧化甲醇活性的研究  

Studies of electro-oxidation of methanol in acidic solution on NiO-enhanced Pt /C catalysts

作　　者：白庆星[1] 陈金伟[1] 杨鑫[1] 陆超[1] 胥诚成[1] 顾佳林[1] 姜春萍[1] 王瑞林[1] 

机构地区：[1]四川大学材料科学与工程学院,四川成都610065

出　　处：《化学研究与应用》2012年第4期541-545,共5页Chemical Research and Application

基　　金：成都市科技局攻关计划(10GGYB380GX-023;10GGYB828GX-023)资助项目;教育部博士点基金(20110181110003)资助项目

摘　　要：本文基于NiO作为Pt催化甲醇助催化剂的思路,通过Pt纳米颗粒担载在NiO修饰的碳材料载体上制备了Pt/NiO-C催化剂,系统地研究了不同的NiO/C热处理温度对Pt粒径的影响,并重点探讨了Pt对NiO的质量比对催化氧化甲醇的影响。X射线衍射分析结果显示NiO和Pt均为立方晶系,且NiO的加入有利于主催化剂Pt形成较小的粒径,且经400℃热处理NiO修饰的C材料作为载体有利于Pt的有效分散。所获得的Pt/NiO-C催化剂的电化学活性在甲醇酸性溶液中通过循环伏安法(CV)和计时电流法(CA)进行性能测试。CV测试结果显示以Pt/NiO重量比为4∶1的催化剂其电氧化甲醇活性最大,其峰值氧化电流密度达806 mA/mgPt,是Pt/C催化剂的1.64倍。CA测试结果显示Pt/NiO-C比Pt/C具有更好的抗CO中毒性能和稳定性。In an attempt to utilize NiO as a co-catalyst with Pt for methanol electro-oxidation,Pt /NiO-C were prepared by attaching Pt nanoparticles on NiO coated Vulcan XC-72R carbon blacks in this study.Heat treatment of NiO at different temperatures on the influences of Pt particle size was investigated,and the weight ratio of Pt to NiO on the catalytic oxidation of methanol was also studied.X-ray diffraction results indicated that both NiO and Pt belong to cubic structure and Pt nano-particles on NiO / C supports had smaller particle size than those on Vulcan XC-72R without NiO.NiO / C heat treatment at 400℃ is good for Pt effective dispersion.The methanol electro-oxidation was studied in acid medium by cyclic voltammetry and chronoamperometry.The catalytic activity of Pt for methanol oxidation can be significantly enhanced by introducing NiO.The composition with ratio of Pt to NiO（4： 1） exhibited the highest mass activity（806 mA / mg Pt） in the as-prepared version,which was 1.64 times higher that that on the Pt/C catalyst.Pt / NiO-C catalysts showed better stability and CO tolerant capability than Pt / C catalysts from chronoamperometry testing.

关 键 词：Pt/NiO复合催化剂制备 Pt与NiO的质量比 NiO-C热处理温度 甲醇电氧化活性 

分 类 号：O611.4[理学—无机化学]