Black TiO2 inverse opals for visible-light photocatalysis†
Abstract
Black titanium dioxide (TiO2) inverse opals (BTIOs) were obtained by in situ H2 reduction of white TiO2 inverse opals (WTIOs). The combination of chemical hydrogenation and well-ordered inverse opal structure provides BTIOs with a better photocatalytic activity than the structure-related WTIOs, fragments of BTIOs, and P25 under visible light.