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首页> 外文会议>Pacific Rim Meeting on Electrochemical and Solid-State Science >Compositions, Structures, and Properties of Mesoporous-Fe,N-Containing Carbon Materials for Oxygen- and Sulfur-Reduction Electrocatalysts
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Compositions, Structures, and Properties of Mesoporous-Fe,N-Containing Carbon Materials for Oxygen- and Sulfur-Reduction Electrocatalysts

机译：Mesopors-Fe，含N碳材料的组合物，结构和性质用于氧和硫 - 还原电催化剂

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Mesoporous N- and Fe,N-carbon materials, prepared by polymerization of small molecule precursors and subsequent pyrolysis, exhibit high and accessible surface areas, high electrical conductivities, and high electrocatalytic activities that are comparable to more expensive activated-carbon-supported precious-metal (Pt) fuel cell electrocatalysts. Their favorable properties are due to a combination of factors, including high nitrogen contents that increase the number of active moieties, selective formation of certain types of N moieties at surface sites, relatively large (3 nm) mesopores to promote facile diffusion, and sufficient electron conductivity to surface N environments where the reactions occur. The resulting materials exhibit electrocatalytic properties that are comparable to a standard catalyst containing 20 wt% Pt supported on activated carbon. This is evident in Figure 1a, which shows current-voltage plots associated with the reduction of oxygen for 20 wt% Pt-C and for various N- and Fe,N-mesoporous carbon materials that were prepared identically except for the use of different mesostructured porogen templates. These results show that the oxygen reduction activities of the mesoporous N-carbons are significantly higher when a ZnCl_2/NaCl salt mixture is used to produce mesoporosity, compared to mesoporous silica. In addition, the incorporation of a small amount (0.5 wt%) of Fe in the mesoporous N-carbon greatly improves oxygen reduction reactivity, which is shown to be superior to the commercial 20 wt% Pt-C. Similarly favorable activities and trends are observed for these materials as electrocatalysts for sulfur reduction.
机译：通过小分子前体的聚合制备的介孔N-和Fe，N-碳材料和随后的热解，表现出高和可接近的表面积，高电导率和高电催化活性，与更昂贵的活性碳支持的珍贵 - 金属（PT）燃料电池电催化剂。它们有利的属性是由于因素的组合，包括增加活性部分的高氮含量，在表面位点的某些类型的N部分的选择性形成，相对较大（3nm）的中孔，以促进容易的扩散，以及足够的电子导电性与反应发生的表面N环境。所得材料表现出与含有20wt％PT的标准催化剂相当的电催化性质表现出与活性炭负载的标准催化剂相当。这在图1A中是明显的，其显示与20wt％pt-c的氧气的减少相关的电流 - 电压曲线，以及用于不同的N-和Fe，N-介孔碳材料，除了使用不同的腹腔结构外相同的制备孔子模板。这些结果表明，与介孔二氧化硅相比，当使用ZnCl_2 / NaCl盐混合物产生介孔率时，中孔N-碳的氧还原活性显着更高。此外，在介孔N-Carbon中掺入少量（0.5wt％）Fe大大提高了氧还原反应性，其显示出优于商业20wt％pt-c。对于这些材料作为硫涂有的电催化剂，将观察到类似的活性和趋势。

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