Abstract

In this work, composite materials based on carbide-derived carbon (CDC) and carbon nanotubes (CNT) modified with Co phthalocyanine (CoPc) were employed as electrocatalysts towards the oxygen reduction reaction (ORR) in both alkaline and acid media. Two different CDCs derived from titanium carbide and silicon carbide were used and the CDC-to-CNT ratio was varied in the composite materials. The final catalysts were obtained after pyrolysis at 800 °C. The catalyst materials were characterised by scanning electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy and microwave plasma atomic emission spectroscopy. The ORR measurements were performed using the rotating disk electrode (RDE) method. The RDE results revealed that the composite catalysts with higher CNT content possessed higher ORR electrocatalytic activity. The catalyst showing the highest activity in RDE tests was selected as a cathode material and tested in an anion exchange membrane fuel cell (AEMFC). An excellent AEMFC performance was obtained, with a peak power density of 473 mW cm⁻².

中文翻译：

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钴酞菁改性的碳化物衍生的碳/碳纳米管复合催化剂上的氧电还原

摘要

在这项工作中，将基于碳化物衍生的碳（CDC）和经钴酞菁（CoPc）修饰的碳纳米管（CNT）的复合材料用作在碱性和酸性介质中进行氧还原反应（ORR）的电催化剂。使用了两种源自碳化钛和碳化硅的不同CDC，并且复合材料中CDC与CNT的比率有所不同。在800℃下热解后获得最终催化剂。通过扫描电子显微镜，X射线衍射，X射线光电子能谱和微波等离子体原子发射光谱来表征催化剂材料。使用旋转圆盘电极（RDE）方法执行ORR测量。RDE结果表明，CNT含量较高的复合催化剂具有较高的ORR电催化活性。选择在RDE测试中显示出最高活性的催化剂作为阴极材料，并在阴离子交换膜燃料电池（AEMFC）中进行测试。获得了出色的AEMFC性能，峰值功率密度为473 mW cm⁻²。