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Caption : figure s1. calculated model and corresponding energy of a n2 molecule adsorbed on (a) the top site of in atom and (b) the bridge site between in and v atom.

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Caption : figure s2. free energy diagrams for n2 reduction through (a) distal, (b) alternating mechanisms at u= 0 v and -0.33 v, respectively.

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Caption : figure s3. schematic synthetic route of invo4 and eg-invo4 nanosheets. 

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Caption : figure s4. stem image and eds element mapping profiles of invo4 with in, o, and v distribution.

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Caption : figure s5. saed patterns of eg10h-invo4

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Caption : figure s6. raman patterns of invo4 with different solvothermal treatment times. 

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Caption : figure s7. xps survey spectra of invo4 and eg10h-invo4.

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Caption : figure s9. digital image of (a) invo4 and (b) eg10h-invo4.

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Caption : figure s8. (a) xps survey spectra of eg20h-invo4. high-resolution xps spectra of (b) in 3d, (c) o 1s, and (d) v 2p3/2 of eg20h-invo4.

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Caption : figure s10. tauc plots of invo4 and eg10h-invo4.

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Caption : figure s11. pl spectra of pristine invo4 and eg10h-invo4.

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Caption : figure s12. control experiments under different conditions.

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Caption : figure s13. (a) xrd patterns, (b) uv-vis absorption spectra of eg10h-invo4 before and after the photocatalytic reaction. sem images of the eg 10h-invo4 nanosheets (c) before and (d) after the photocatalytic reaction.