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首页> 外文期刊>RSC Advances >Efficient oxygen electroreduction over ordered mesoporous Co–N-doped carbon derived from cobalt porphyrin
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Efficient oxygen electroreduction over ordered mesoporous Co–N-doped carbon derived from cobalt porphyrin

机译：高效的氧气电导率衍生自钴卟啉的有序介孔的CO-N-掺杂碳

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The demand for directly converting chemical energy generated by exothermal redox reactions into electrical energy has increased markedly in recent years and motivates the development of novel electrochemical power sources. The use of fuel cell technology may be the most promising solution for electrochemical propulsion in electric vehicles. However, at present, the design and synthesis of high-performance and low-cost catalysts for the oxygen reduction reaction (ORR) still remains a significant challenge. Here, a high-performance Co-based carbon electrocatalyst (Co–N–GC) for the ORR is prepared by a simple wet-impregnation nanocasting method using SBA-15 as a hard template and water-soluble cobalt porphyrin as a precursor. The prepared catalysts with Co–N _( x ) moieties have ordered mesoporous channels, and high specific surface area and degree of graphitization. In 0.1 M HClO _(4) medium, the ORR over Co–N–GC prepared at the optimized heat-treatment temperature (800 °C) exhibits a positive half-wave potential (0.79 V) and higher ORR current density (5.6 mA cm ~(?2) at 0.2 V) compared to commercial Pt/C (20 wt%) catalysts. Moreover, the prepared Co–N–GC materials possess intrinsic long-time stability and the excellent methanol resistance toward the ORR in both acidic and alkaline media, and may serve as a promising alternative to Pt/C materials for the ORR in the widespread implementation of fuel cells.
机译：近年来，对通过放热氧化还原反应产生的化学能量的需求显着增加，并激励了新颖的电化学电源的发展。使用燃料电池技术可能是电化学电化学推进中最有希望的解决方案。然而，目前，对氧还原反应（ORR）的高性能和低成本催化剂的设计和合成仍然是一个重大挑战。这里，通过使用SBA-15作为硬模板和水溶性钴卟啉作为前体的简单湿浸渍纳米占方法制备用于ORR的高性能Co-碳电催化剂（CO-N-GC）。具有CO-N _（X）部分的制备的催化剂具有有序的介孔通道，以及高比表面积和石墨化程度。在0.1M HClO _（4）培养基中，在优化的热处理温度（800℃）下制备的CO-N-GC上的ORR显示出正半波电位（0.79V）和更高的ORR电流密度（5.6 mA与商业Pt / C（20wt％）催化剂相比，Cm〜（α2）0.2 v）。此外，制备的Co-N-GC材料具有内在的长时间稳定性和呈酸性和碱性培养基中的ORR的优异的甲醇抗性，并且可以作为广泛实施的ORR中Pt / C材料的有希望的替代品燃料电池。

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