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. 2015 Oct 23;6:8696. doi: 10.1038/ncomms9696

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Optimized structures of each step in ORR on the {101}-TiO₂, {001}-TiO₂ and {001}-TiO_2−x. (a,g,m) Initial structure, (b,h,n) O₂²⁻*, (c,i,o) HOO⁻*, (d,j,p) O*, (e,k,q) OH* and (f,l,r) OH⁻, white, red and grey spheres indicate H, O and Ti atoms, respectively.