多元醇法合成的Pt_(2.6)Sn_1Ru_(0.4)/C用作直接乙醇燃料电池高性能阳极催化剂(英文)  

Polyol-synthesized Pt_(2.6)Sn_1Ru_(0.4)/C as a high-performance anode catalyst for direct ethanol fuel cells

作　　者：王琪[1] 陆兴[1] 辛勤[2] 孙公权[2] 

机构地区：[1]大连交通大学材料科学与工程学院中心实验室,辽宁大连116028 [2]中国科学院大连化学物理研究所洁净能源国家实验室,辽宁大连116023

出　　处：《催化学报》2014年第8期1394-1401,共8页

基　　金：financially supported by the Specialized Research Fund for the Doctoral Program of Higher Education of China (20122124120004)~~

摘　　要：采用多元醇法制备了不同原子比例和载量的PtSnRu/C催化剂,利用透射电镜和X射线光电子能谱表征了所制备催化剂的物化性能,采用直接乙醇燃料电池(DEFC)单池性能测试了其电化学性能,并利用电化学原位光谱、气相色谱和中和滴定分析了乙醇电氧化过程和产物.DEFC单电池测试表明Pt2.6Sn1Ru0.4/C催化剂具有较高的电池性能,其中,以60 wt%Pt2.6Sn1Ru0.4/C催化剂为阳极的DEFC性能最高,90 oC下最高功率密度为121 mW/cm2.电化学原位红外光谱和阳极产物分析表明乙酸、乙醛、乙酸乙酯和CO2是乙醇电化学氧化产物,Pt2.6Sn1Ru0.4/C催化剂上乙醇的氧化效率较高.阳极乙醇氧化活化能和催化剂表面组成分析结果表明,表面组成的相互作用使Pt2.6Sn1Ru0.4/C催化剂具有较低的乙醇氧化活化能和较高的乙醇氧化活性.PtSnRu/C catalysts with different atomic ratios and metal loadings were prepared using a polyol process to improve the performance of direct ethanol fuel cells（DEFCs）. The catalysts were charac‐terized using transmission electron microscopy and X‐ray photoelectron spectroscopy. The DEFC performance was evaluated using a single‐cell test. The ethanol electro‐oxidation process and anode products were analyzed using in situ Fourier‐transform infrared spectroscopy（FTIRS）, gas chro‐matography, and neutralization titration. The performance of the Pt2.6Sn1Ru0.4/C catalyst was better than those of the Pt3Sn1/C and Pt2Sn1Ru1/C catalysts. The carbon‐supported Pt2.6Sn1Ru0.4 catalyst with a 60 wt% metal loading gave a maximum power density of 121 mW/cm2 at 90 ℃. In situ FTIRS and anode product analysis indicated that ethanol was electro‐oxidized to acetaldehyde, acetic acid, ethyl acetate, and CO2. The ethanol oxidation efficiency on the Pt2.6Sn1Ru0.4/C catalyst was higher than that on the Pt3Sn1/C catalyst. The activation energy of ethanol electro‐oxidation at the anode and surface composition analysis indicated that interactions among the surface elements resulted in a lower apparent activation energy and greater ethanol electro‐oxidation efficiency on the Pt2.6Sn1Ru0.4/C catalyst.

关 键 词：直接乙醇燃料电池 阳极催化剂 多元醇法 阳极产物 乙醇氧化效率 

分 类 号：O643.36[理学—物理化学] TM911.4[理学—化学]