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首页> 外文期刊>RSC Advances >Tunable and convenient synthesis of highly dispersed Fe–Nx catalysts from graphene-supported Zn–Fe-ZIF for efficient oxygen reduction in acidic media
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Tunable and convenient synthesis of highly dispersed Fe–Nx catalysts from graphene-supported Zn–Fe-ZIF for efficient oxygen reduction in acidic media

机译：从石墨烯 - 负载的Zn-Fe-ZIF中可调谐和方便地合成高度分散的Fe-NX催化剂，用于酸性介质的有效氧气还原

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The development of low-cost, efficient and stable electrocatalysts for the oxygen reduction reaction (ORR) is desirable but remains a great challenge. We report a convenient and efficient synthesis approach of highly dispersed Fe–N _( x ) catalysts for ORR. Typically, Fe–Zn-ZIF (zeolitic imidazolate frameworks) nanocrystals cast as precursor and graphene as supports, highly dispersed Fe–N _( x ) species were fabricated with PVP (polyvinyl pyrrolidone) as surfactant via pyrolysis. With the help of graphene and surfactant, the agglomeration of iron particles has been avoided during pyrolysis, and the size and morphology of ZIF particles intercalating into the graphene layers can be regulated precisely as well. The amount of Fe–N _( x ) active sites in C-rGO-ZIF catalyst arrived 4.29%, which is obviously higher than most monodispersed non-precious metal catalysts reported. The obtained C-rGO-ZIF catalyst exhibits a high onset potential of 0.89 V and a half-wave potential of 0.77 V, which is only 30 mV away from Pt/C in acidic media. The active sites of the catalyst was characterized and found to be the highly dispersed Fe–N _( x ) species, large and accessible specific surface area of graphene and abundant active nitrogen atoms. When the C-rGO-ZIF catalyst was applied in the cathode of fuel cell, the power density can reach up to 301 mW cm ~(?2) , which highlights a practical application potential on small power supplies.
机译：为氧还原反应（ORR）的低成本，高效且稳定的电催化剂的开发是理想的，但仍然是一个很大的挑战。我们报告了用于ORR的高度分散的Fe-N _（X）催化剂的方便高效的合成方法。通常，Fe-Zn-ZIF（沸石咪唑酯骨架）作为前体和石墨烯作为载体的纳米晶体，用PVP（聚乙烯吡咯烷酮）作为表面活性剂通过热解制备高度分散的Fe-N _（X）物种。借助石墨烯和表面活性剂，在热解期间已经避免了铁颗粒的凝聚，并且可以精确地调节嵌入到石墨烯层中的ZIF颗粒的尺寸和形态。 C-rgo-ZIF催化剂中的Fe-N _（X）活性位点的量到达4.29％，显着高于大多数单分散的非贵金属催化剂。所得的C-rgo-ZIF催化剂具有0.89V的高发行电位和0.77V的半波电位，其仅在酸性介质中的PT / C仅30mV。表征催化剂的活性位点并发现是高度分散的Fe-N _（X）物种，大于石墨烯和丰富的活性氮原子的比表面积。当在燃料电池的阴极中施加C-Rgo-ZIF催化剂时，功率密度可以达到301mM厘米〜（？2），这突出了小电源的实际应用潜力。

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