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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
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采用对碳纳米管进行混酸中超声处理,并通过浸渍一还原方法,在碳纳米管表面上形成了分散均匀的Pd纳米粒子,得到了Pd/CNTs催化剂。用扫描电镜(SEM)对酸化后CNTs试样进行表征,并在酸性介质中采用交流阻抗法测试Pd/CNTs催化剂工作电极的电化学催化活性。结果表明:Pd/CNTs催化剂能够表现出较强的电催化活性。 相似文献
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采用浓硫酸、浓硝酸组成的混酸体系对多壁碳纳米管进行了酸化处理,并通过浸渍-还原方法合成了Pd/CNTs催化剂,在多壁碳纳米管表面上得到分散均匀的Pd纳米粒子。采用X射线衍射(XRD)及透射电镜(TEM)对Pd/CNTs催化剂试样进行表征,并在酸性介质中测试合成Pd/CNTs的析氢电化学催化活性。结果表明:Pd/CNTs催化剂能够表现出较强的析氢电催化活性,当电位为-0.5 V时,其电流密度达到828 m A/cm2。 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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直接硼氢燃料电池(DBFC),是一种新型的高比能便携式电源,其电池电势(1.64 V)及理论比能量(9 300 Wh/kgNaBH4)均高于直接甲醇燃料电池.为了实现BH4-的8电子完全氧化,分别以Ketjen炭黑、Vxc-72R炭黑为载体,采用溶胶-凝胶法制备了纳米级的Au/C催化剂,并采用分层装配的方法组装了单电池,考察了催化剂载体及载体处理对电池性能的影响.结果表明,溶胶-凝胶法是制备纳米级高分散Au/C催化剂的有效方法,Ketjen炭黑载体明显优于Vxc-72 R炭黑,载体经酸处理后可大大提高电池的性能. 相似文献
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