Abstract
The impressive optoelectronic performance and low production cost of metal halide perovskites have inspired applications well beyond efficient solar cells. Herein, we widen the materials engineering options available for the efficient and selective photocatalytic oxidation of benzylic alcohols, an industrially significant reaction, using formamidinium lead bromide (FAPbBr3) and other perovskite-based materials. The best performance was obtained using a FAPbBr3/TiO2 hybrid photocatalyst under simulated solar illumination. Detailed optical studies reveal the synergetic photophysical pathways arising in FAPbBr3/TiO2 composites. An experimentally supported model rationalizing the large conversion enhancement over the pure constituents shows that this strategy offers new prospects for metal halide perovskites in photocatalytic applications.
Highlights
Organic−inorganic halide perovskites (OIHPs) have emerged as an extremely exciting family of semiconductor materials, garnering strong promise for a range of photonic applications. This stems from several advantages of OIHPs over other well-established semiconductors, such as low-cost facile processing, tunable band gaps, and superior charge transport properties.[1]
We build on the strong photoactivity of formamidinium (FA; HC(NH2)2+) lead bromide (FAPbBr3) perovskites for the highly efficient and selective photocatalytic oxidation of benzylic alcohols
Pure FAPbBr3 and TiO2 crystallize into their thermodynamically stable cubic perovskite and anatase phases, respectively (powder X-ray diffraction (p-XRD), Figure S1).[20−22] p-XRD of FAPbBr3/TiO2 consists of peaks from both phases, indicating successful synthesis of a FAPbBr3/TiO2 hybrid
Summary
Letter inorganic oxidant, notably dichromate and permanganate; noble metal catalysts Pt, Pd, and Au; or organic oxidants such as 2,2,6,6-tetramethylpiperidine oxide.[10−17]. These results prove that the described photocatalytic strategy reported here is generic. In building a clear picture of how the photocatalytic behavior is so dramatically enhanced for the hybrid system, the different recombination pathways described above are summarized and identified in Scheme 1A,B To further support this model, electron spin resonance (ESR) spectroscopy was performed to identify the generated reactive active oxygen species under solar light irradiation with 5,5-dimethyl-1-pyrroline N-oxide (DMPO) is used as the trapping agent (Figure 4A). Experimental details on materials synthesis and photocatalytic activity measurements, XPS, SEM, diffuse reflectance spectroscopy, and photoluminescence (PDF)
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