Dexuan Li,Guoshen Zeng,Yaoyao Wu,Zhenyu Zhou,Wei Guo,Chuanhao Li
The co-catalysts engineering, especially the non-noble traditional metal dichalcogenides (MoS 2 ), is a promising strategy in promoting photocatalytic water splitting for the green hydrogen gas production. Herein, we constructed a novel Au induced 1T-MoS 2 modified S-doped-g-C 3 N 4 (denoted as MASCN) photocatalyst . The experimental and characterizations results have showed that the sulfur doped g-C 3 N 4 (SCN) could increase the dispersity of the Au nanoparticles (NPs) and help to improve the combination between SCN and Au NPs to promote electrical conductivity . More importantly, ultra-stable 1T-MoS 2 was in situ formed within the induction of Au nanoparticles (NPs), thus providing high-density active sites and decreasing the interfacial charge transfer. As a result, the optimal sample exhibits a drastically enhanced photocatalytic hydrogen evolution rate (HER) of 4708.3 μmol/g/h, over 87-fold the rate of pure SCN (54 μmol/g/h) and appropriately 25-fold the rate of MoS 2 modified SCN (denoted as MSCN) (185 μmol/g/h). The hybrids also manifest excellent stability and durability in cycle. This study highlights the construction strategy of MoS 2 based co-catalyst for solar water splitting reactions and may provide insightful understandings for other photocatalytic applications.
Man Li,Qianqian Jia,Ping Wang,Ran Liu,Hongxiu Wu,Guangyan Cheng,Zhenguo An,Jingjie Zhang
Hollow microsphere absorbents hold great potential for lightweight and multi-band compatible design due to their inherent low density and thermal conductivity, but it remains a great challenge to rationally control the microstructures to achieve an optimal balance of low density, high mechanical strength, impedance matching, attenuation ability, and thermal performance. In this work, bimetallic alloys and glass are selected as the model materials for the functional and supporting shells to construct lightweight yet robust hollow microspheres. The rational design and highly efficient realization of the composition and miscibility control of the bimetallic alloy are first emphasized. An in-depth investigation is conducted on the effects of metal type and component compatibility on the microstructure of the structural units (SU), and further on the electromagnetic and thermal performances. The results confirm the necessity and effectiveness of regulating the integrity and microstructure of the electromagnetic and thermal networks via alloying-induced migration and aggregation behavior control. The optimized product exhibits comprehensive advantages of being simultaneously thin (1.69 mm), wide (5.20 GHz), light (0.81 g cm −3 ), strong (−23.8 dB), high mechanical strength (91.87% survival rate at 20 MPa) and low thermal conductivity (0.063 W m −1 K −1 ), indicating excellent radar-infrared stealth capabilities and structural stability.
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