Planar films of pure and Ti⁴⁺-doped β-Fe₂O₃ were prepared by a spray pyrolysis method. X-ray diffraction patterns and Raman spectra of the metastable β-Fe₂O₃ film showed that its thermal stability was significantly improved because of covalent bonds in the interfaces between the film and substrate, while only weak Van der Waals bonds existed at the interfaces within the particle-assembled β-Fe₂O₃ film prepared by electrophoretic deposition. The as-prepared planar films were thus able to withstand higher annealing temperature and stronger laser irradiation power in comparison with the β-Fe₂O₃ particle-assembly. Ti⁴⁺ doping was used to increase the concentration of carriers in the metastable β-Fe₂O₃ film. Compared with pure β-Fe₂O₃ photoanodes, the highest saturated photocurrent for water splitting over the Ti⁴⁺-doped β-Fe₂O₃ photoanode was increased by a factor of approximately three. The β-Fe₂O₃ photoanode exhibited photochemical stability for water splitting for a duration exceeding 100 h, which indicates its important potential application in solar energy conversion.

通过喷雾热解法制备纯的和Ti ⁴⁺掺杂的β- Fe ₂ O _{3 的平}面膜。亚稳态β- Fe ₂ O ₃薄膜的X射线衍射图和拉曼光谱表明，由于薄膜与基材之间的界面存在共价键，其热稳定性显着提高，而界面处仅存在弱范德华键内粒子组装β -Fe ₂ O ₃电泳沉积制备的薄膜。因此，与β- Fe ₂ O ₃颗粒组装体相比，所制备的平面膜能够承受更高的退火温度和更强的激光照射功率。Ti ⁴⁺掺杂用于增加亚稳态β- Fe ₂ O ₃薄膜中的载流子浓度。与纯β- Fe ₂ O ₃光阳极相比，Ti ⁴⁺掺杂的β- Fe ₂ O _{3 上}分解水的饱和光电流最高光阳极增加了大约三倍。所述β-的Fe ₂ ö ₃光电阳极显示出的水分解光化学稳定性的持续时间超过100小时，这表明在太阳能转换其重要的潜在应用。