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Caption : figure s1. (a) pl spectra and (b) uv-vis spectra of solution obtained from the piezocatalytic system using 0.5:1 c-knbo3 as the catalysts. 

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Caption : figure s2. eds spectrum of 0.5:1 c-knbo3.

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Caption : figure s3. sem images of 0.5:1 c-knbo3 after the piezocatalytic reduction of agno3.

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Caption : figure s4. eds measurement of nanoparticles from (110) plane. the elements c, k, nb, and o come from 0.5:1 c-knbo3. al might be attributed to the tin foil used to bearing the dispersed samples. it is confirmed that nanoparticles are ag.

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Caption : figure s5. xps survey spectra of (a) knbo3 and (b) 0.5:1 c-knbo3. high-resolution xps spectra of (c) k 2p and (d) nb 3d of knbo3 and 0.5:1 c-knbo3.

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Caption : figure s6. pfm phase of (a) knbo3 and (b) 0.5:1 c-knbo3.