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中文摘要：
采用溶胶凝胶法制备了用于阴离子膜直接甲醇燃料电池阳极的Ni基双金属Ni-Pt/C催化剂（Pt的质量分数为5%）,采用循环伏安法测试了催化剂电催化氧化甲醇的活性,并用XRD、TEM和XPS表征了金属粒子的微观形貌、晶型、表面元素,以考察催化剂制备过程中还原剂用量等工艺条件对纳米金属微观形貌及甲醇电氧化性能的影响。结果表明,所制得的Ni-Pt金属粒子直径为4~6 nm,属面心立方（fcc）晶型,粒子表面的Pt、Ni原子数比高于其内部;随着还原剂用量的增加和煅烧温度提高,催化剂活性呈先增高后降低的变化趋势,最佳还原剂用量为理论值的1.2倍,最佳煅烧温度为400℃,Ni、Pt前驱体同时加入制得的合金型Ni-Pt催化活性最高。
英文摘要：
Ni-Pt/C（Pt mass fraction of 5%）,which is Ni-based binary metal nano-particle electro-catalyst used in anion exchange membranes direct methanol fuel cell,was prepared by sol-gel method.The effects of catalyst preparation conditions,such as the amount of reducing agent,on performance of NiPt/C for methanol electrocatalytic oxidation were investigated by cyclic voltammetry,and the morphology,crystalline structure and composition of particle surface were characterized by transmission electron microscopy（TEM）,X-ray diffraction（XRD） and X-ray photoelectron spectroscopy（XPS）.The results show that,the diameter of Ni-Pt nano-particles with face-center-cubic structure（fcc） was about 4~6 nm,the Pt and Ni atomic ratio of surface was higher than that of the bulk,with the increase in the amount of reducing agent and the calcination temperature,the catalytic activity increased at first and then decreased,the optimum reductant dosage was 1.2 times the theoretical value,the best calcination temperature was 400℃,when Ni and Pt precursors for the catalysts were reduced at the same time,Ni-Ptalloy/C had the highest catalytic activity.
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