Synthesis and Characterization of Three-Dimensionally Ordered Macroporous (3DOM) Tungsten Carbide: Application to Direct Methanol Fuel Cells
Synthesis and Characterization of Three-Dimensionally Ordered Macroporous (3DOM) Tungsten Carbide: Application to Direct Methanol Fuel Cells
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DOI：
10.1021/cm901855y
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发表时间：
2010-02-09
影响因子：
8.6
通讯作者：
Chen, Jingguang G.
中科院分区：
文献类型：
--
作者：
Bosco, Jeffrey P.;Sasaki, Keisuke;Chen, Jingguang G.
采用“反蛋白石”法合成了不同孔径的三维有序大孔碳化钨（3DOM WC）。使用聚甲基丙烯酸甲酯（PMMA）胶体晶体模板，其球直径在180至490 nm范围内。进行了两个合成程序，第一个需要在空气中煅烧钨浸渍的PMMA胶体模板，然后在H-2/CH 4/N-2气氛中碳化。第二个过程涉及直接渗碳的钨浸渍模板没有事先煅烧。还研究了在渗碳之前对模板进行Pt改性对所得材料组合物的影响。使用表面和体积表征技术评价材料性质。最后，采用循环伏安法研究了3DOM WC和Pt改性3DOM WC在酸性电化学环境中对甲醇的电氧化活性。
Three-dimensionally ordered macroporous tungsten carbide (3DOM WC) with varying pore size was synthesized using the "inverse-opal" method. Poly{methyl methacrylate} (PMMA) colloidal crystal template with sphere diameters ranging from 180 to 490 nm was used. Two synthesis procedures were performed, the first requiring calcination of tungsten impregnated PMMA colloidal template in air followed by carburization in H-2/CH4/N-2 atmosphere. The second procedure involved direct carburization Of the tungsten impregnated template without prior calcination. The effect of Pt-modification of the template prior to carburization on the resulting material composition was also investigated. The material properties were evaluated using Surface and bulk characterization techniques. Finally, cyclic voltammetry was used to investigate the methanol electro-oxidation activity of the 3DOM WC and Pt-modified 3DOM WC in acidic electrochemical environment.