Yu Chang,Jianan Zhang,Ivan S. Babichuk,Hailong Liu,Yijie Liu,Jian Yang
The release of ammonia (NH 3 ) in industry or daily life is harmful to human health. A gas sensor was developed using h -MoO 3 nanorods and graphene film to detect and eliminate this. The h -MoO 3 nanorods were first synthesized by chemical bath deposition using ammonium molybdate tetrahydrate (NH 4 ) 6 Mo 7 O 24 •4H 2 O and HNO 3 and then deposited on the graphene film transferred to SiO 2 /Si substrate by electrochemical bubbling method. Subsequently, gas-sensitive h -MoO 3 @Graphene composite films were prepared and analyzed using Raman, XRD, SEM, and UV–vis. The gas sensor's performance was evaluated to detect NH 3 at a room temperature concentration range of 1–60 ppm. Compared with graphene, the conductivity of the composite film with 10 mg/ml h -MoO 3 nanorods was increased by 40 % and the sensitivity increased by 10 times. The sensor h -MoO 3 @G-10 showed the best sensing performance to 1 ppm NH 3 . Sensor sensitivity, response and recovery time are 1.1 %, 46.8 s and 17.8 s.
Zhengwei Yang,Huifeng Wang,Boshi Cheng,Chuang Yue,Gaozhan Liu,Runtian Zheng,Fang Hu,Jie Shu
Micronano porous Mo 2 C@C nanorods (NRs) composite anodes are successfully synthesized using the raw materials of MoO 3 NRs, polyacrylonitrile (PAN) polymer, and inactive sodium chloride (NaCl) microparticles. The abundant and soluble NaCl microparticles act as the sacrificial templates, which increase the surface contact area between the MoO 3 NRs and the PAN polymer, thus promoting the thorough formation of Mo 2 C electrodes during the carbonization process. The optimized Mo 2 C@C-template (MCC-T) NR composite electrodes deliver an enhanced electrochemical performance, which is ascribed to the enlarged surface area, reduced path distance of lithium ions, and structural stability. In addition, the Li-ion storage mechanism and the electrochemical kinetics of Mo 2 C@C NR composite anodes are also systemically and experimentally investigated by ex situ X-ray diffraction (XRD) and cyclic voltammetry (CV) techniques. This synthetic strategy for MCC-T NR composite anodes is helpful to design other nanostructured carbide anodes for high-performance lithium-ion batteries (LIBs).
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