Atomic Fe Embedded in Carbon Nanoshells–Graphene Nanomeshes with Enhanced Oxygen Reduction Reaction Performance,Chemistry of Materials

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Atomic Fe Embedded in Carbon Nanoshells–Graphene Nanomeshes with Enhanced Oxygen Reduction Reaction Performance
Chemistry of Materials ( IF 7.2 ) Pub Date : 2017-11-17 00:00:00 , DOI: 10.1021/acs.chemmater.7b03100
Congwei Wang ₁ , Huinian Zhang _{1,

2} , Junying Wang ₁ , Zheng Zhao _{1,

2} , Jie Wang _{1,

2} , Yan Zhang _{1,

2} , Miao Cheng _{1,

2} , Huifang Zhao _{1,

2} , Junzhong Wang ₁

Affiliation

Low-cost preparation of durable electrocatalysts is vital for energy storage and conversion. Here, we integrated two methods of synthesizing isolated iron atoms into a special carbon matrix as an advanced electrocatalyst. Atomic Fe isolation and graphene nanomeshes or curved carbon nanoshells were almost synthesized simultaneously. The hierarchical atomic Fe/carbon material with 0.53 atom % Fe exhibited superior oxygen reduction reaction (ORR) performance to Pt–C (20 wt % Pt) with 40 mV more positive onset potential, larger current density, and stronger methanol-tolerant capability. We demonstrated that the catalytic active sites were Fe isolation and coordinated with nitrogen in the porous curved carbon-graphene matrix. This strategy could be developed into a general approach to prepare atomic metal/carbon electrocatalysts.

中文翻译：

嵌入碳纳米壳-石墨烯纳米网格中的原子铁具有增强的氧还原反应性能

低成本制备耐用的电催化剂对于能量存储和转化至关重要。在这里，我们将两种将孤立的铁原子合成为特殊碳基质作为高级电催化剂的方法进行了整合。几乎同时合成了原子铁分离和石墨烯纳米网或弯曲的碳纳米壳。具有0.53原子％Fe的分级原子Fe /碳材料表现出优于Pt–C（20 wt％Pt）的氧还原反应（ORR）性能，正电势高40 mV，电流密度更大，耐甲醇能力更强。我们证明了催化活性位是Fe隔离的，并与多孔弯曲碳-石墨烯基体中的氮配位。该策略可以发展为制备原子金属/碳电催化剂的一般方法。

更新日期：2017-11-19

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