Abstract
Aimed at achieving the photo-enhanced dehydrogenation of ammonia borane (NH3BH3) in aqueous solutions, p-type cobalt (Co) doped n-type semiconductors (TiO2, WO3 and TiO2-WO3) based heterojunction structures were proposed for hydrogen production. In the present study, the Co doped n-type semiconductors such as titanium dioxide (TiO2) and tungsten oxide (WO3) were synthesized by hydrothermal synthesis to obtain heterojunction structure and characterized by XRD, SEM/EDS, TEM, FT-IR and UV–Vis techniques. The photo-enhanced catalytic hydrogen production from NH3BH3 dehydrogenation over Co doped n-type semiconductors were tested under light-irradiation (UV-light and day-light) in presence of organic and inorganic scavengers. The experimental results showed that Co @TiO2-WO3 heterojunction structure improved hydrogen production almost three times in terms of TOF values (821 h−1) compared to Co@TiO2 (292 h−1) due to photoelectrons and hole pairs increases activity. The pseudo first order kinetics based on Langmuir-Hinshelwood (L-H) kinetic model fitting revealed that apparent adsorption constant calculated in presence of Co@TiO2-WO3 with lowest value as 4.99 h−1 and 9.75 h−1 for both region, respectively.
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