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Caption : figure s1. sem images of nscn and corresponding elemental mapping.

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Caption : figure s2. raman spectra of the synthesized catalysts.

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Caption : figure s3. high-resolution xps spectra of c 1s and n 1s for 5% nscn.

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Caption : figure s4. eis nyquist plots of prepared catalysts.

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Caption : figure s5. the calculated band structure and total density of states for a) nisx and b) ni9s8.

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Caption : figure s6. the power spectra of the monochromatic light (a) and visible light (b) used in the study. copyright from: http://www.perfectlight.cn/planshow.php?cid=59&id=113.