Efficient Oxygen Reduction Reaction (ORR) Catalysts Based on Single Iron Atoms Dispersed on a Hierarchically Structured Porous Carbon Framework,Angewandte Chemie International Edition

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Efficient Oxygen Reduction Reaction (ORR) Catalysts Based on Single Iron Atoms Dispersed on a Hierarchically Structured Porous Carbon Framework
Angewandte Chemie International Edition ( IF 16.1 ) Pub Date : 2018-06-19 , DOI: 10.1002/anie.201804958
Zhengping Zhang _{1,

2,

3} , Junting Sun ₁ , Feng Wang _{1,

3} , Liming Dai _{2,

3}

Affiliation

Single Fe atoms dispersed on hierarchically structured porous carbon (SA‐Fe‐HPC) frameworks are prepared by pyrolysis of unsubstituted phthalocyanine/iron phthalocyanine complexes confined within micropores of the porous carbon support. The single‐atom Fe catalysts have a well‐defined atomic dispersion of Fe atoms coordinated by N ligands on the 3D hierarchically porous carbon support. These SA‐Fe‐HPC catalysts are comparable to the commercial Pt/C electrode even in acidic electrolytes for oxygen reduction reaction (ORR) in terms of the ORR activity (E_1/2=0.81 V), but have better long‐term electrochemical stability (7 mV negative shift after 3000 potential cycles) and fuel selectivity. In alkaline media, the SA‐Fe‐HPC catalysts outperform the commercial Pt/C electrode in ORR activity (E_1/2=0.89 V), fuel selectivity, and long‐term stability (1 mV negative shift after 3000 potential cycles). Thus, these nSA‐Fe‐HPCs are promising non‐platinum‐group metal ORR catalysts for fuel‐cell technologies.

中文翻译：

基于单铁原子分散在分层结构多孔碳骨架上的高效氧还原反应（ORR）催化剂

通过热解封闭在多孔碳载体微孔内的未取代酞菁/酞菁铁复合物，可以制备分散在分层结构的多孔碳（SA-Fe-HPC）骨架上的单个Fe原子。单原子Fe催化剂在3D分层多孔碳载体上具有定义明确的Fe原子原子分散，该原子由N配体协调。即使在用于氧还原反应（ORR）的酸性电解液中，这些SA‐Fe‐HPC催化剂在ORR活性（E _1/2 = 0.81 V）方面也可与商用Pt / C电极相媲美，但具有更好的长期电化学性能稳定性（3000个潜在循环后7 mV负移）和燃料选择性。在碱性介质中，SA-Fe-HPC催化剂的ORR活性优于商用Pt / C电极（E _1/2 = 0.89 V），燃料选择性和长期稳定性（3000个潜在循环后1 mV负移）。因此，这些nSA-Fe-HPC是有前途的用于燃料电池技术的非铂族金属ORR催化剂。

更新日期：2018-06-19

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