Design of High‐Quality Pt–CeO2 Composite Anodes Supported by Carbon Black for Direct Methanol Fuel Cell Application
Design of High‐Quality Pt–CeO2 Composite Anodes Supported by Carbon Black for Direct Methanol Fuel Cell Application
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DOI：
10.1111/j.1551-2916.2006.01483.x
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发表时间：
2007-04
影响因子：
3.9
通讯作者：
Motoi Takahashi;T. Mori;F. Ye;A. Vinu;Hidehiko Kobayashi;J. Drennan
中科院分区：
文献类型：
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作者：
Motoi Takahashi;T. Mori;F. Ye;A. Vinu;Hidehiko Kobayashi;J. Drennan
采用共浸渍法制备了纳米CeO2负载铂催化剂。这种潜在的燃料电池负极材料是通过分步合成的方法合成的。用碳铵沉淀法合成了纯净的CeO2，并将铂粒子分散在CeO2上，得到了均匀分散的炭黑(Pt-CeO2/CB)。用循环伏安法和计时电流法研究了甲醇在铂-CeO2/CB上的氧化反应的电化学活性。与商用的铂-Ru/碳(C)合金阳极相比，甲醇在铂-CeO2/CB阳极上的氧化起始电位向低电位移动。此外，铂-CeO2/CB阳极的活化能远低于铂-Ru/C合金阳极。此外，在28~60℃温度范围内，铂-CeO2/CB阳极的电流密度远高于铂-Ru/C合金阳极。这些结果表明，在典型燃料电池的工作温度下(80℃)，铂-CeO2/CB阳极的阳极性能优于更常见的铂-Ru/C合金阳极。重要的是，目前的负极材料不需要稀有金属Ru，所需的铂量也大大减少。因此，我们报道了一种在直接甲醇燃料电池开发中有应用前景的候选铂-CeO2/CB复合阳极。
A Pt on nano-sized CeO2 particles that in turn are supported on carbon black (CB) was synthesized using the co-impregnation method. This potential anode material for fuel cell applications was synthesized in a stepwise process. The pure CeO2 was synthesized using an ammonium carbonate precipitation method, and the Pt particles dispersed on the CeO2 in such a way that a uniform dispersion with the CB was obtained (Pt-CeO2/CB). The electrochemical activity of the methanol (CH3OH) oxidation reaction on the Pt-CeO2/CB was investigated using cyclic voltammetry and chronoamperometry experimentation. The onset potential of CH3OH oxidation reaction on the Pt-CeO2/CB anode was shifted to a lower potential as compared with that on commercially available Pt-Ru/carbon (C) alloy anode. In addition, the activation energy of the Pt-CeO2/CB anode was much lower than that of the Pt-Ru/C alloy anode. Moreover, the current density of the Pt-CeO2/CB anode was much higher than that of the Pt-Ru/C alloy anode at temperatures between 28 degrees and 60 degrees C. These results suggest that the anode performance of the Pt-CeO2/CB anode at the operating temperature of typical fuel cells (80 degrees C) is superior to that of the more usual Pt-Ru/C alloy anode. Importantly, the rare metal, Ru, is not required in the present anode material and the amount of Pt required is also significantly reduced. As a consequence, we report a promising candidate Pt-CeO2/CB composite anode for application in the development of direct methanol fuel cells.