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改性石墨烯用作燃料电池阴极催化剂
Application of Modified Graphene for Cathode Catalysts in Fuel Cells
石墨烯材料以其独特的超薄片层结构、超高比表面积、良好的导电性等重要特性,而被认为在制备高性能燃料电池催化剂方面具有重要的潜在应用价值。最近的一些研究工作表明,通过选择合适的制备方法和前驱体制备的改性石墨烯,对于氧还原反应具有一定的活性,可用作燃料电池阴极催化剂。目前有关石墨烯应用于燃料电池阴极催化剂的研究工作主要集中在两个方面:一是通过表面改性后直接作为燃料电池非贵金属阴极催化剂;二是将改性石墨烯作阴极催化剂载体而制备活性组分高度分散的高性能催化剂。尽管有关改性石墨烯的氧还原活性中心的结构尚不明确,然而由于这类材料在酸性及碱性环境下对氧还原的良好的催化性能,对改性石墨烯的研究已成为探索燃料电池非铂催化剂的新途径。随着这类材料的催化性能的不断提高和对表面-活性关系认识的不断深入,改性石墨烯材料在燃料电池方面将具有广阔的应用前景。
Graphene, as a novel material, is recognized as a type of potential and attractive materials for the preparation of high performance fuel cell catalysts due to its unique structure and properties, such as ultra thin layer structure, ultra high surface area, and excellent conductivity, etc. Recent investigation showed that doped or surface modified graphene can be a potential candidate for the fuel cell catalyst by choosing different preparation process and varying the precursors. In this paper, we reviewed the research works in recent years for the application of doped and modified graphene as the cathode catalysts for fuel cells, including the direct use of doped graphene as catalyst for oxygen cathodic reduction, and the use of doped or surface modified graphene as support for the preparation of high performance cathode catalyst. Although the exact active center on these doped graphene for oxygen reduction reaction is still under debate, the succeed catalysis in both alkaline and acid solution opened up a brand new approach for the development of non-precious catalysts in fuel cells. With the improvement of catalytic performance and further understanding of structure-activity relation, we prospected that the application of doped-graphene in fuel cells will be broadened. Contents
1 Introduction
2 Direct use of modified graphene as cathode catalysts for oxygen reduction
2.1 Doped graphene and their performance as cathode catalysts
2.2 Surface modified graphene catalysts
3 Modified graphene as support for the preparation of cathode catalysts
3.1 Pt-based metals/modified graphene catalysts
3.2 Non-noble metals/modified graphene catalysts
4 Conclusions and outlook
modified graphene
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