The surface morphology evolution of the bulk ceramic Y2Mo3O12 during the release of crystal water is followed in situ for the first time using atomic force microscopy. It is found that both the shape and size of individual grains and the integration morphology of the sample exhibit dynamic changes with increasing temperature. We believe that the surface morphology evolution of the sample with increasing temperature is closely correlated with the forces induced by the contraction and expansion of the lattice during crystal water release in two different stages.

High photoelectronic response with a broad spectral range in photoelectric materials is of great importance for photovoltaic and photocatalytic applications. However, the existing photoelectric materials, such as TiO 2 and α-Fe 2 O 3 , exhibit only high photoelectronic response or only broad spectral response because of the wide band gap limitation of light absorbance or low photogenerated charge separation efficiency. Here, we report NaBiO 3 •2H 2 O annealed at a given temperature to form NaBiO 3 • 2H 2 O/NaBiO 3 •xH 2 O heterostructures, which efficiently drives the photogenerated charge separation in a broad spectral range. The best performance of the wide photoelectronic response and high surface photovoltage was obtained in the sample annealed at 130 °C. The high surface photovoltage with a wide spectral range is attributed to the band gap engineering of NaBiO 3 •2H 2 O/NaBiO 3 •xH 2 O heterostructures for efficient photogenerated charge separation. These findings regarding the use of optimized NaBiO 3 • 2H 2 O/NaBiO 3 •xH 2 O heterostructures suggest that fine-tuning the heterostructure of the photoelectric materials is an effective approach for improving the photoelectrical performance in optoelectronic applications.