File Name : figure s1 in tiff format.tif Caption : fig. s1. sem images of biobr. File Name : figure s2 in tiff format.tif Caption : fig. s2. characterization for band diagram construction. (a) drs spectra; (b) tauc plots. File Name : figure s3 in tiff format.tif Caption : fig. s3. ups spectra of photocatalysts. (a) biobr; (b) biobr-ovs. the intersections of the tangents with the baseline give the edges of the ups spectra from which the ups width is determined. File Name : figure s4 in tiff format.tif Caption : fig. s4. band structure alignments of biobr and biobr-ovs. File Name : figure s5 in tiff format.tif Caption : fig. s5. control experiments results. (a) h2o2 yields over biobr without light irradiation and without photocatalysts. (b) h2o2 yields over biobr-ovs without light irradiation and without photocatalysts. reaction conditions: o2 atmosphere, 50 mg photocatalysts, 100 ml h2o, and 300 w xe lamp. File Name : figure s6 in tiff format.tif Caption : fig. s6. photocatalytic stability of biobr-ovs under visible-light irradiation in 2% hcooh. reaction conditions: o2 atmosphere, 50 mg photocatalysts, 100 ml 2% hcooh solution, and 300 w xe lamp. File Name : figure s7 in tiff format.tif Caption : fig. s7. xrd pattern of biobr-ovs after circulation. File Name : figure s8 in tiff format.tif Caption : fig. s8. sem images of biobr-ovs after circulation. File Name : figure s9 in tiff format.tif Caption : fig. s9. xps characterizations of biobr-ovs after circulation. (a) survey xps spectrum; (b) bi 4f spectrum; (c) o 1s spectrum; (d) br 3d spectrum. File Name : figure s10 in tiff format.tif Caption : fig. s10. (a) transient photocurrent responses of the photocatalysts; (b) eis spectra of biobr and biobr-ovs. File Name : figure s11 in tiff format.tif Caption : fig. s11. transient photocurrent response of the biobr-ovs with hcooh. File Name : figure s12 in tiff format.tif Caption : fig. s12. uv-vis absorption spectra of the rhb at different irradiation time. File Name : figure s13 in tiff format.tif Caption : fig. s13. (a) comparison of rhb degradation with different concentration; (b) comparison of rhb degradation in different atmosphere. File Name : figure s14 in tiff format.tif Caption : fig. s14. the influence of •o2- and •oh scavengers on the photocatalytic h2o2 production over biobr-ovs. (a) pbq; (b) ipa. File Name : figure s15 in tiff format.tif Caption : fig. s15. epr spectra of radical species. (a) temp-1o2 for biobr under light illumination with and without hcooh; (b) temp-1o2 for biobr-ovs under light illumination with and without hcooh. File Name : figure s16 in tiff format.tif Caption : fig. s16. gas chromatogram of co2. (a) pure co2; (b) gas in the reactor after the reaction. File Name : figure s17 in tiff format.tif Caption : fig. s17. the calibration curve used for estimation of hcooh concentration.