High surface area mesoporous TiO2 beads were prepared using a facile two steps method without any post-annealing. The obtained TiO2 beads were doped with nitrogen using various nitrogen precursors having different concentrations. Photoanodes were then fabricated using the obtained as-synthesized or doped TiO2 beads. Selected TiO2 photoanodes were deposited with a layer of cobalt-phosphate or CoPi. It was found that nitrogen doping prior to the CoPi loading is very critical for the successful loading of the CoPi. The materials characteristics of the photoanodes were first examined. Photoelectrochemical cells having different TiO2–based photoanodes were then evaluated for hydrogen generation. The hydrogen generation efficiency was enhanced, by as much as 460%, due to the nitrogen doping. Further enhancement of the efficiency has also been achieved through the addition of CoPi. Moreover, we demonstrate the role of CoPi is to drastically boost the light absorption. A high photocurrent conversion efficiency of 0.44% has been obtained. Compared to the pure TiO2 photoanode, the CoPi increases the efficiency by as much as 880%.
All Science Journal Classification (ASJC) codes
- Condensed Matter Physics
- Surfaces and Interfaces
- Surfaces, Coatings and Films
- Materials Chemistry