Design of an Assembly of Poly(benzimidazole), Carbon Nanotubes, and Pt Nanoparticles for a Fuel-Cell Electrocatalyst with an Ideal Interfacial Nanostructure
Design of an Assembly of Poly(benzimidazole), Carbon Nanotubes, and Pt Nanoparticles for a Fuel-Cell Electrocatalyst with an Ideal Interfacial Nanostructure
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DOI：
10.1002/smll.200801742
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发表时间：
2009-03-20
期刊：
影响因子：
13.3
通讯作者：
Nakashima, Naotoshi
中科院分区：
文献类型：
--
作者：
Okamoto, Minoru;Fujigaya, Tsuyohiko;Nakashima, Naotoshi
一种由多壁碳纳米管（MWNTs）、聚苯并咪唑（PBI）和铂纳米颗粒组成的新型纳米复合材料。该复合材料是通过制备PBI包裹的MWNT (MWNT/PBI)，然后将Pt加载到MWNT/PBI上制备的。由于PBI包裹，Pt纳米颗粒在MWNTs上的负载效率显著提高，达到58.8%，而原始MWNTs的负载效率为41.0%。该工艺还允许均匀的Pt固定在MWNTs表面，而不需要对MWNTs进行强烈的氧化过程，而MWNTs通常用于碳纳米管上的金属支撑。复合材料的远红外光谱显示了一个来自Pt- n键的峰值，表明这些改进来自于Pt离子与PBI分子的配位。循环伏安测量表明，沉积在MWNT/PBI上的Pt纳米粒子对电催化剂的利用率（74%）高于原始MWNT（39%）。
A newly designed and fabricated novel nanocomposite composed of multiwalled carbon nanotubes (MWNTs), poly (benzimidazole) (PBI),and Pt nanoparticles. This composite is fabricated by the preparation of PBI-wrapped MWNTs (MWNT/PBI), followed by Pt loading onto the MWNT/PBI. As a result of the PBI wrapping, the loading efficiency of the Pt nanoparticles onto the MWNTs is dramatically improved up to 58.8% compared to that of the pristine MWNTs (41.0%). The process also allows homogeneous Pt immobilization onto the surface of MWNTs without ally strong oxidation process for the MWNTs that is typically used for metal supporting on carbon nanotubes. Far-IR spectroscopy of the composite shows a peak from the Pt-N bonding, indicating that these improvements are derived from the coordination of the Pt ion with the PBI molecules. Cyclic voltammogram measurements reveal that the Pt nanoparticles deposited on the MWNT/PBI shows higher utilization efficiency (74%) for electrocatalysts compared to that on the pristine MWNT (39%).