Abstract:
:Single-atom catalysts (SACs) have sparked broad interest recently while the low metal loading poses a big challenge for further applications. Herein, a dual protection strategy has been developed to give high-content SACs by nanocasting SiO2 into porphyrinic metal-organic frameworks (MOFs). The pyrolysis of SiO2@MOF composite affords single-atom Fe implanted N-doped porous carbon (FeSA-N-C) with high Fe loading (3.46 wt%). The spatial isolation of Fe atoms centered in porphyrin linkers of MOF sets the first protective barrier to inhibit the Fe agglomeration during pyrolysis. The SiO2 in MOF provides additional protection by creating thermally stable FeN4/SiO2 interfaces. Thanks to the high-density FeSA sites, FeSA-N-C demonstrates excellent oxygen reduction performance in both alkaline and acidic medias. Meanwhile, FeSA-N-C also exhibits encouraging performance in proton exchange membrane fuel cell, demonstrating great potential for practical application. More far-reaching, this work grants a general synthetic methodology toward high-content SACs (such as FeSA, CoSA, NiSA).
journal_name
Nat Communjournal_title
Nature communicationsauthors
Jiao L,Zhang R,Wan G,Yang W,Wan X,Zhou H,Shui J,Yu SH,Jiang HLdoi
10.1038/s41467-020-16715-6subject
Has Abstractpub_date
2020-06-05 00:00:00pages
2831issue
1issn
2041-1723pii
10.1038/s41467-020-16715-6journal_volume
11pub_type
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