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首页> 外文期刊>International Journal of Electrochemical Science >Characterization of Zeolitic Imidazolate Framework–derived Polyhedral Carbonaceous Material and its Application to Electrocatalyst for Oxygen Reduction Reaction
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Characterization of Zeolitic Imidazolate Framework–derived Polyhedral Carbonaceous Material and its Application to Electrocatalyst for Oxygen Reduction Reaction

机译：沸石咪唑酸酯骨架衍生的多面体碳质材料的表征及其在电催化剂中进行氧还原反应的应用

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摘要

A porous carbonaceous material is synthesized by direct carbonization of zeolitic imidazolateframework-67 (ZIF-67). A series of analytical tools such as scanning/transmission electronmicroscopy, gas chromatography/mass spectroscopy, thermogravimetric analysis, nitrogen adsorption,X-ray diffraction, X-ray photoelectron spectroscopy and 3D tomography are conducted for thecharacterization of the prepared carbonaceous material (ZIF-C). ZIF-C has a well-defined concavedodecahedral shape, and its chemical composition, surface area and electrical conductivitysubstantially depend on carbonization temperature. ZIF-C heat-treated at 800C (ZIF-C-800) shows atypical nitrogen adsorption-desorption isotherm of mesoporous materials with unimodal pores around2 nm and sufficiently high electrical conductivity comparable to that of carbon nanotubes. ZIF-C-800has Co metal particles wrapped by graphene layers on the walls of the interior open channels, and itsframework is composed of Co-N, C-N species and C-C networks. ZIF-C-800 also displays the highestoxygen reduction reaction catalytic activity among ZIF-C treated at various temperatures, and itsfeasibility as cathode electrocatalysts for fuel cells is demonstrated by confirming the single cellperformance.
机译：多孔碳质材料是通过将沸石咪唑盐骨架67（ZIF-67）直接碳化而合成的。进行了一系列分析工具，如扫描/透射电子显微镜，气相色谱/质谱，热重分析，氮气吸附，X射线衍射，X射线光电子能谱和3D层析成像，以表征所制备的碳质材料（ZIF-C ）。 ZIF-C具有明确的凹面十二面体形状，其化学组成，表面积和电导率基本上取决于碳化温度。在800°C热处理的ZIF-C（ZIF-C-800）显示出具有2nm左右单峰孔且电导率与碳纳米管相当的中孔材料的非典型氮吸附-解吸等温线。 ZIF-C-800在内部开放通道的壁上具有被石墨烯层包裹的Co金属颗粒，其框架由Co-N，C-N物种和C-C网络组成。 ZIF-C-800在各种温度下处理的ZIF-C中也显示出最高的氧还原反应催化活性，并且通过确认单电池性能证明了其作为燃料电池阴极电催化剂的可行性。

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