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为了研究Pt修饰非晶态催化剂对甲醇电催化氧化行为的影响,采用两步法合成了碳载Pt修饰非晶态CoSn合金催化剂。使用透射电镜和X射线衍射技术分析了CoSn/C前体和Pt-CoSn/C催化剂的形貌及晶体结构;利用循环伏安法和旋转圆盘电极技术测试电化学性能,比较了Pt/C、PtRu/C和Pt-CoSn/C催化剂对甲醇氧化的电催化活性和稳定性。结果表明,Pt修饰非晶态CoSn合金催化剂对甲醇氧化有较好的电催化性能,Pt用量显著降低。非晶态CoSn合金具有良好的质子和电子传导能力,提高了Pt对甲醇氧化的电催化活性;Pt-CoSn/C对甲醇电催化的质量活性和稳定性要优于PtRu/C催化剂。 相似文献
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胶态Pt/C催化剂对甲醇的电催化氧化性能 总被引:3,自引:0,他引:3
研究了Pt金属载量为20%的碳载胶态Pt金属催化剂对甲醇的电催化氧化性能,并与E-TEK公司同类型催化剂进行了比较.X衍射光谱(XRD)和透射电镜(TEM)研究显示在胶态Pt/C催化剂中,Pt粒子的平均粒径为3.8 nm,并且具有良好的均一度.电化学研究显示尽管胶态Pt/C催化剂拥有相对较小的电化学活性面积,但对甲醇的电催化氧化性能却明显优于E-TEK公司的Pt/C催化剂,其原因应归结于利用有机溶胶法制得的胶态Pt/C催化剂拥有更合理的平均粒径. 相似文献
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采用微波多元醇法合成了Pt/C、Pt-M(Fe、Co、Ni)/C电催化剂,通过X-射线衍射仪(XRD)和透射电镜(TEM)测试手段对催化剂的微观结构、表面形貌等物理性能进行表征,并对其电化学性能进行了比较。测试结果表明:催化剂均高度分散在Vulcan XC-72碳载体上,Pt/C、Pt-Fe/C、Pt-Ni/C和Pt-Co/C电催化剂的平均粒径分别为:3.4、2.6、2.8、3.1 nm。在室温28℃下测得的电化学性能结果表明:合成催化剂在甲醇中的氧化活性高低顺序为:Pt-Fe/CPt-Co/CPt-Ni/CPt/C,催化剂电催化性的稳定性高低顺序为:Pt-Ni/CPt-Co/CPt-Fe/CPt/C,合成的Pt-M/C电催化剂催化性能均比Pt/C催化剂高,掺入合金Fe、Co和Ni后的Pt-M/C催化剂均具有较好的抗CO中毒的能力。 相似文献
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Porous carbon materials (SM-C, HS-C and TM-C) were prepared using commercial colloidal silicas (SM-30, HS-40 and TM-50) and
a resorcinol-formaldehyde resin as a removable template and a carbon precursor, respectively. All of the prepared carbons
had high surface areas with narrow pore size distributions. In particular, the pore diameter of the carbons could be controlled
over a range of mesopore size by the use of an appropriate silica employed as a template. Mesoporous carbon templated using
TM-50 had the largest pore size, while that for SM-C, was the smallest. Pt nanoparticles were supported on these mesoporous
carbons for use as a catalyst in a polymer electrolyte membrane fuel cell (PEMFC). The crystallite size of the Pt catalyst
was found to be closely related to the properties of the corresponding carbon support. A carbon support with a large pore
size and a high surface roughness was found to favor the dispersion of Pt crystallite. In a single cell test, the Pt catalysts
supported on mesoporous carbons exhibited higher cell performance than that on activated carbon. In particular, the Pt/TM-C
catalyst showed the best cell performance among the catalysts tested. In addition to the high surface area of the active metal,
the large pore size of the Pt/TM-C appears to have positive effect on the distribution of ionomer, resulting in facile formation
of a triple-phase boundary. 相似文献
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PEMFC用Pt/CNTs电催化剂研究进展 总被引:1,自引:0,他引:1
采用碳纳米管(CNTs)取代导电碳黑合成质子交换膜燃料电池(PEMFC)用电催化剂是近几年来一个新的研究方向。本文从载体的比表面和电化学稳定性两方面对Pt/CNTs催化剂的优势进行了分析,结合现有的研究进展对Pt/CNTs和传统的Pt/C催化剂进行了性能比较,认为Pt/CNTs催化剂是有可能取代传统的Pt/C催化剂、使燃料电池突破价格瓶颈的关键技术之一。同时详细介绍了Pt/CNTs的合成方法与影响因素,并对其需要改进的部分进行了展望。 相似文献