(001)Facet of Anatase TiO, /98 (001) (101) a b 2c-0 6c-Ti 5c-Ti 2c-0 5c-Ti 3c-0 Highest surface energy of 0.9 J m2 (vs.0.44 J m-2 of (101) surfaces) Unsaturated Ti and O atoms,and unequivalent Ti-O bonds Problem:Quick diminishment during synthesis Yang et al.,Nature,2008,453,638.• Highest surface energy of 0.9 J m-2 (vs. 0.44 J m-2 of (101) surfaces) • Unsaturated Ti and O atoms, and unequivalent Ti-O bonds • Problem: Quick diminishment during synthesis (001) (101) (001) Facet of Anatase TiO2 Yang et al., Nature, 2008, 453, 638