Nanocasting SiO2 into metal–organic frameworks imparts dual protection to high-loading Fe single-atom electrocatalysts

Long Jiao, Rui Zhang, Gang Wan, Weijie Yang, Xin Wan, Hua Zhou, Jianglan Shui, Shu-Hong Yu and Hai-Long Jiang ()
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Long Jiao: University of Science and Technology of China, Hefei
Rui Zhang: University of Science and Technology of China, Hefei
Gang Wan: Argonne National Laboratory
Weijie Yang: North China Electric Power University
Xin Wan: Beihang University
Hua Zhou: Argonne National Laboratory
Jianglan Shui: Beihang University
Shu-Hong Yu: University of Science and Technology of China, Hefei
Hai-Long Jiang: University of Science and Technology of China, Hefei

Nature Communications, 2020, vol. 11, issue 1, 1-7

Abstract: 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).

Date: 2020
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DOI: 10.1038/s41467-020-16715-6

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