2D Single‐Atom Catalyst with Optimized Iron Sites Produced by Thermal Melting of Metal–Organic Frameworks for Oxygen Reduction Reaction,Small Methods

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2D Single‐Atom Catalyst with Optimized Iron Sites Produced by Thermal Melting of Metal–Organic Frameworks for Oxygen Reduction Reaction
Small Methods ( IF 10.7 ) Pub Date : 2020-02-05 , DOI: 10.1002/smtd.201900827
Dong Liu _{1,

2} , Jin‐Cheng Li _{1,

3} , Shichao Ding ₁ , Zhaoyuan Lyu ₁ , Shuo Feng ₁ , Hangyu Tian ₁ , Chenxi Huyan ₁ , Mingjie Xu _{3,

4} , Tao Li ₅ , Dan Du ₁ , Peng Liu ₂ , Minhua Shao ₃ , Yuehe Lin ₁

Affiliation

Zeolitic‐imidazolate‐frameworks‐8 (ZIF‐8) derivatives have recently been demonstrated as one of the most ideal precursors to prepare single‐atom metal catalysts for oxygen reduction reaction (ORR). However, abundant single‐atom metal sites are buried in the derived carbon nanoparticles, rendering them useless for ORR. Here a novel ZIF‐8 “thermal melting” strategy is proposed to prepare a high specific surface area of Fe‐N‐doped graphene nanosheets (Fe‐N/GNs) with single‐atom Fe‐sites on the surface which are accessible to electrolytes, optimizing their utilization and improving ORR activity. As a result, the Fe‐N/GNs material exhibits excellent ORR activity with half‐wave potentials of 0.903 V in alkaline media and 0.837 V in acidic media, which are comparable to commercial Pt/C catalysts.

中文翻译：

二维单原子催化剂，通过金属-有机骨架的热熔进行氧还原反应，具有优化的铁位点

沸石-咪唑啉骨架8（ZIF-8）衍生物最近被证明是制备用于氧还原反应（ORR）的单原子金属催化剂的最理想前体之一。但是，大量的单原子金属位点埋在衍生的碳纳米粒子中，使其对ORR无效。在这里，提出了一种新颖的ZIF-8“热熔”策略，以制备高比表面积的Fe-N掺杂石墨烯纳米片（Fe-N / GNs），其表面上具有单原子的Fe-位，电解质可接近这些位点，优化其利用率并改善ORR活动。结果，Fe-N / GNs材料表现出出色的ORR活性，在碱性介质中的半波电势为0.903 V，在酸性介质中的半波电势为0.837 V，与商用Pt / C催化剂相当。

更新日期：2020-02-05

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