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首页> 外文期刊>Catalysis science & technology >Supramolecular confinement synthesis of ultrafine iron nitride nanocrystals for the oxygen reduction reaction in Zn-air batteries
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Supramolecular confinement synthesis of ultrafine iron nitride nanocrystals for the oxygen reduction reaction in Zn-air batteries

机译：Supramolecular confinement synthesis of ultrafine iron nitride nanocrystals for the oxygen reduction reaction in Zn-air batteries

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摘要

Non-noble metal nitrides have emerged as highly efficient and robust substitutes for platinum-based catalysts toward the oxygen reduction reaction. Herein, we demonstrate a supramolecular confinement strategy to synthesize ultrafine iron nitride (Fe3N, less than 1.5 nm) nanocrystals embedded in a nitrogen-doped carbon matrix, in which the pre-formed Fe-N coordination bonds can anchor the Fe3N nanocrystals and prevent their agglomeration during the pyrolysis process. Reducing the size of Fe3N nanocrystals is conducive to exposing more accessible Fe-N-C ORR active sites and consequently facilitating electrocatalytic ORR activity. The optimized Fe3N/NC-800 exhibits a positive half-wave potential of 0.83 V versus RHE, along with favorable stability and superior tolerance toward methanol. The power density and specific capacity of the optimized Zn-air batteries associated with Fe3N/NC-800 are as high as 90.91 mW cm~(-2) and 691.59 mA h g~(-1), respectively. Briefly, a feasible supramolecular confinement strategy is proposed for the construction of ultrafine nanocrystals.
机译：非贵金属氮化物已成为高度高效和健壮的替代品含铂催化剂对氧还原反应。合成超分子限制策略超细氮化铁(Fe3N小于1.5海里)纳米晶体嵌入nitrogen-doped碳矩阵,成品Fe-N协调债券可以锚Fe3N纳米晶体和防止他们聚集在热解的过程。有利于更容易暴露Fe-N-C吗奥尔活跃的网站,从而促进electrocatalytic或者活动。Fe3N / nc - 800展览一个正半波0.83 V的潜力和流值,以及良好的稳定性和优良的容忍甲醇。优化的Zn-air电池有关Fe3N高达90.91 mW / nc - 800厘米~(2)和691.59 mA h g ~(1),分别。可行的超分子限制策略提出了超细的建设纳米晶体。

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