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Caption : figure s1 the (a) sem and (b) tem images of fe-mil-88; and the sem images of (c) fe/c, (d) nife/c, (e) znfe/c and (f) mnfe/c. 

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Caption : figure s2 particle distribution of the fresh mfe/c catalysts. (a) fe/c, (b) nife/c, (c) znfe/c and (d) mnfe/c. 

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Caption : figure s3 the eds elemental mapping of the fresh mfe/c catalysts. (a) fe/c, (b) nife/c, (c) znfe/c and (d) mnfe/c.

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Caption : figure s4 the eds of the fresh mfe/c catalysts. (a) fe/c, (b) nife/c, (c) znfe/c and (d) mnfe/c.

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Caption : figure s5 the physical and chemical properties of the mfe/c catalysts: (a) xrd patterns of spent mfe/c catalysts; (b) ni 2p xps spectra of fresh and spent nife/c; zn 2p xps spectra of (c) fresh and (d) spent znfe/c; mn 2p xps spectra of (e) fresh and (f) spent mnfe/c.

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Caption : figure s6 the xrd patterns (a) and mössbauer spectra (b) of mnfe/c catalysts after h2 reduction.

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Caption : figure s7 unit cell structure of fe at different sites in fe5c2: the cell crystal structure (a) and 3x3x3 crystal structure (b) of fe5c2.