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首页> 外文期刊>Journal of Materials Chemistry, A. Materials for energy and sustainability >Trimetal atoms confined in openly accessible nitrogen-doped carbon constructs for an efficient ORR
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Trimetal atoms confined in openly accessible nitrogen-doped carbon constructs for an efficient ORR

机译：三缩醛原子限制在公开可接近的氮气掺杂碳构建体中，用于有效的ORR

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摘要

The electrochemical oxygen reduction reaction (ORR) is one of the key processes for various energy storage and conversion systems. To date, transition metal-based nitrogen-carbon systems (M/NC) have been demonstrated as promising low-cost catalysts. However, their low content of metals and the lack of coupling among multimetal atoms still affect the ORR kinetics. Herein, we develop a hierarchical N-doped carbon structure to house isolated trimetal (Co, Fe and Zn) atomsviapyrolysis of doped amorphous ZIF-90. Owing to the versatile compositional and structural design of its precursors, the resultant catalyst has a high metal loading (5.5 wt%) and a highly open structure with abundant mesopores, which significantly increase the population of effective active sites. Moreover, charge transfer among these three metals (Co, Fe and Zn) is found, which leads to the promotion of the oxidation state of Co species (primary active sites). Benefiting from the openly accessible active sites and the promotion effect, the catalyst exhibits remarkable ORR activity and stability, outperforming its bimetallic/single metal counterparts and commercial Pt/C.
机译：电化学氧还原反应（ORR）是各种能量存储和转换系统的关键方法之一。迄今为止，已证明过渡金属基氮碳系统（M / NC）作为有前途的低成本催化剂。然而，它们的金属的低含量和多重原子缺乏偶联仍然影响ORR动力学。在此，我们开发一种分层N掺杂的碳结构，以容纳掺杂无定形ZIF-90的孤立的三兆状（CO，Fe和Zn）βvioPyrolys。由于其前体的多功能组成和结构设计，所得催化剂具有高金属负载（5.5wt％）和具有丰富的中孔的高度开放结构，显着增加了有效活性位点的群体。此外，发现这三种金属（CO，Fe和Zn）中的电荷转移，这导致促进CO物种的氧化状态（主要活性位点）。受益于公开接近的活性网站和促进效果，催化剂表现出显着的ORR活性和稳定性，优于其双金属/单金属对应物和商业Pt / c。

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