Title : 1D/0D Heterojunction nanohybrids extremely excitons transfer for superior photocatalytic hydrogen evolution and NO2 gas detection at ambient temperature
Photocatalytic hydrogen generation and room temperature gas sensors are promising to minimize environmental pollution and carbon-based gas emissions . In this work, TiO2 nanoparticles grown onto CdS nanorods were designed via two-stage facile synthesis to obtain 1D/0D unique heterostructures. Subsequently, titanate nanoparticles loading onto CdS surfaces, with an optimized titanate concentration (20 mM) showed noteworthy superior photocatalytic hydrogen generation (21.4 mmol/ h/gcat) under 1.5G air mass solar light irradiation. The recyclability of the optimized nanohybrid for six cycles, each cycle has 4 h, indicating that the prepared hetero-structured photocatalyst is an excellent stable material for a prolonged lifetime energy application. In addition, the optimized active CRT-2 was used for an effective room temperature NO2 gas detection. The CRT-2 sensor showed a higher response (69.16 %) towards NO2 gas (100 ppm) at room temperature (RT) with the lowest detection limit of ~118 ppb when compared to its pristine counterparts. The CRT-2 sensor showed a short response/recovery time, good cycling stability, and excellent selectivity to NO2 gas at RT. The NO2 gas sensing performance of CRT-2 sensor was further boosted using the UV light (365 nm) activation energy. As expected, under the UV light, the sensor exhibited a remarkable gas sensing response with a fast response/recovery and a significant selectivity towards NO2 gas. Furthermore, a long-term stability test under dark and UV light towards 100 ppm of NO2 gas was performed at RT and the results showed a significant response continuously for up to 6 weeks without any major loss in the sensor response, signifying that the developed sensor is more reliable for stable gas sensing applications. Thus, excellent photocatalytic and gas sensing performances of CRT-2 material can be ascribed to its high surface area, morphology, synergistic effect, enhanced charge generation, and separation. The constructive 1D/0D CdS@TiO2 heterojunction material is highly efficient for multi-applications such as energy generation, environmental monitoring, and safety at RT.
Keywords: Photocatalyst, heterostructures, hydrogen, sensors, stability, and environmental pollution.
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