Fe-doped MoO3 nanoribbons for high-performance hydrogen sensor at room temperature

Yang, Shulin; Lei, Gui; Tan, Lun; Xu, Hu; Xiong, Juan; Zhao, Wansheng; Gu, Haoshuang

doi:10.1016/j.jallcom.2021.160200

Cited by 38 publications

(6 citation statements)

References 85 publications

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“…In contrast, the MoO 3 /TiO 2 -10 composite exhibits a slight positive shift of the peaks at 458.36 and 464.13 eV (0.24 and 0.28 eV, respectively) due to the presence of molybdenum in the lattice of titanium dioxide through the formation of Mo–O–Ti bonding. − The 1 s spectra of both samples are shown in Figure b. The fitted peaks at binding energies 529.9 and 531.4 eV of pure TiO 2 correspond to the crystal lattice oxygen (O L ) and chemisorbed oxygen (O C ), respectively. − Likewise, for the MoO 3 /TiO 2 -10 composite, the predominant peak at 529.78 eV represents the crystal lattice oxygen (Ti–O and Mo–O), and the peak at 531.2 eV is assigned to the chemisorbed oxygen, respectively. , It is worth noting that the MoO 3 /TiO 2 -10 composite can adsorb more oxygen, which is beneficial to enhance the gas sensing performance at room temperature. As illustrated in Figure c, the Mo 3d spectrum of the MoO 3 /TiO 2 -10 composite displays two peaks at 232.6 and 235.7 eV corresponding to the Mo 3d 2/5 and Mo 3d 3/2 , respectively. − Moreover, the nonstoichiometric Mo ions (Mo 5+ ) are present, which can act as active sites for oxygen ion adsorption and further as the adsorption center for catalytic oxidation of hydrogen gas. ,,, …”

Section: Resultsmentioning

confidence: 99%

“…With the broader use of hydrogen energy, it is necessary to have a reliable hydrogen gas sensor to detect the concentration of hydrogen to guarantee the safety of modern industrial processes. − Metal oxide semiconductors (MOSs) have been widely applied in hydrogen gas sensors such as ZnO, − SnO 2 , − MoO 3 , − WO 3 , − TiO 2 , ,, etc. due to their characteristics of low cost, simple preparation, high sensitivity, and rapid response/recovery.…”

Section: Introductionmentioning

confidence: 99%

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MoO₃/TiO₂ Nanoparticle-Based Composites for Hydrogen Sensing at Room Temperature

Zhang,

Ding,

Fan

et al. 2024

ACS Appl. Nano Mater.

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In this study, a series of mesoporous TiO 2 nanotablets implanted with uniformly distributed MoO 3 were formed by the heat treatment of a titanium-based metal−organic framework (MIL-125) in the presence of Mo ions, and their hydrogen sensing properties were investigated for the first time. The TiO 2 and MoO 3 /TiO 2 composites present a typical tablet-like morphology. Compared with the bare TiO 2 , the MoO 3 /TiO 2 (Mo 6+ /Ti 4+ = 1:10) composite has a richer porous structure (3 times larger than pure TiO 2 ) which can provide a larger surface area (2.1 times larger than pure TiO 2 ). The sensing performance reveals that the MoO 3 /TiO 2 composite (Mo 6+ : Ti 4+ = 1:10) not only exhibits the highest response of 47.57 (5 times higher than pure TiO 2 ) to 1000 ppm of H 2 at room temperature but also shows good reproducibility, long-term stability, and selectivity, which is mainly due to the richer porous structures, the n−n heterojunction, and the catalytic effect between MoO 3 and hydrogen. It is noteworthy that the response of the optimal MoO 3 /TiO 2 composite has shown an exponential increase at higher hydrogen concentrations and reaches 1178 at 4000 ppm of hydrogen.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

MoO₃/TiO₂ Nanoparticle-Based Composites for Hydrogen Sensing at Room Temperature

Zhang,

Ding,

Fan

et al. 2024

ACS Appl. Nano Mater.

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“…In addition, through density functional theory, Xu et al proved that H 2 has large adsorption energy, charge transfer and shortest adsorption distance on the surface of MoO 3 than CO 50 . So, when MoO 3 /α‐Fe 2 O 3 ‐1 is exposed to H 2 environment, the adsorbed oxygen species will react with H 2 occur on both the Fe 2 O 3 and surface MoO 3 , as shown in Equations () and () 51 . Above reaction, more conduction electrons are sent back to the conduction bands of MoO 3 and α‐Fe 2 O 3 , thereby decreasing the band bending and reducing the barrier height, as shown in Figure 8D.…”

Section: Resultsmentioning

confidence: 99%

Adjustable p‐n transition behavior based on MoO ₃ ‐decorated hollow α‐Fe ₂ O ₃ for highly hydrogen‐selective sensors

Kang

et al. 2022

Intl J of Energy Research

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Hydrogen sensing is very important in terms of its explosive and flammable effects on human health and industrial production. However, achieving trace level detection of H 2 with high selectivity, fast response, and good sensitivity at high temperatures remains a challenge. In this work, MoO 3 -decorated threedimensional hollow α-Fe 2 O 3 nanoboxes were obtained using a simple wetchemical method, which evolved from Prussian blue as a template. Phase and structure analyses confirmed that MoO 3 was successfully scattered on the α-Fe 2 O 3 nanoboxes surface. The gas sensor fabricated using the MoO 3 / α-Fe 2 O 3 -1 hollow nanoboxes shows exclusive H 2 sensing properties with ntype and p-type sensing response to CO, together with a fast response/recovery time at 300 C. The abnormal sensing characteristic is associated with the change in the potential barrier height due to the heterojunction-structure formation of MoO 3 and α-Fe 2 O 3 . This work provides a general approach for tuning the sensing selectivity of gas sensors via the modulation of potential barrier heights in p-n heterojunctions.

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“…Over the past decade, researchers have focused on the synthesis of MoO 3 nanostructures with novel properties for multifunctional device applications. MoO 3 NPs and their composites have been used as gas sensors [14] and as electrode materials for energy conversion and storage [15,16]. They have been effectively used in various catalytic reactions such as alcohol oxidation [17], epoxide ring-opening [18], ethanol oxidation, oxygen reduction [19], n-dodecane oxidation [20], sulfide to sulfate oxidation [21], and olefin epoxidation [22].…”

Section: Introductionmentioning

confidence: 99%

Biogenic Synthesis of High-Performance α-MoO3 Nanoparticles from Tryptophan Derivatives for Antimicrobial Agents and Electrode Materials of Supercapacitors

Prakash

Siddarapu

Nimmagadda

et al. 2023

International Journal of Energy Research

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Molybdenum trioxide nanoparticles (MoO3 NPs) are recognized for their applications in novel multifunctional devices. Here, a biogenic, environmentally friendly method using Lepidagathis cristata leaf extract was employed to synthesize MoO3 NPs. The as-obtained MoO3 NPs exhibited a predominant (0 k0) orientation, representing an α-MoO3 structure. The absorption band at 984 cm-1 observed in the Fourier-transform infrared spectrum corresponded to the terminal Mo = O bond, thereby confirming that the prepared MoO3 NPs were in the orthorhombic phase. Scanning and transmission electron microscopy data revealed that the MoO3 NPs were well crystallized and uniformly distributed with grain sizes in the 70-100 nm range. The biogenic MoO3 NPs demonstrated an excellent zone of inhibition against the selected Gram -ve and Gram +ve bacterial strains, thus providing an alternative to standard antibacterial agents. During electrochemical experiments conducted in a 1 M aqueous Na2SO4 solution, cyclic voltammetry (CV) curves of the MoO3 NPs showed a pseudocapacitive nature, with a high discharge specific capacitance of 294 F/g and good cyclability. These results suggest the feasibility of the proposed biogenic, environmentally friendly method for preparing MoO3 NPs for application in multifunctional devices.

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Fe-doped MoO3 nanoribbons for high-performance hydrogen sensor at room temperature

Cited by 38 publications

References 85 publications

MoO₃/TiO₂ Nanoparticle-Based Composites for Hydrogen Sensing at Room Temperature

MoO₃/TiO₂ Nanoparticle-Based Composites for Hydrogen Sensing at Room Temperature

Adjustable p‐n transition behavior based on MoO ₃ ‐decorated hollow α‐Fe ₂ O ₃ for highly hydrogen‐selective sensors

Biogenic Synthesis of High-Performance α-MoO3 Nanoparticles from Tryptophan Derivatives for Antimicrobial Agents and Electrode Materials of Supercapacitors

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Fe-doped MoO3 nanoribbons for high-performance hydrogen sensor at room temperature

Cited by 38 publications

References 85 publications

MoO3/TiO2 Nanoparticle-Based Composites for Hydrogen Sensing at Room Temperature

MoO3/TiO2 Nanoparticle-Based Composites for Hydrogen Sensing at Room Temperature

Adjustable p‐n transition behavior based on MoO 3 ‐decorated hollow α‐Fe 2 O 3 for highly hydrogen‐selective sensors

Biogenic Synthesis of High-Performance α-MoO3 Nanoparticles from Tryptophan Derivatives for Antimicrobial Agents and Electrode Materials of Supercapacitors

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Product

Resources

About

MoO₃/TiO₂ Nanoparticle-Based Composites for Hydrogen Sensing at Room Temperature

MoO₃/TiO₂ Nanoparticle-Based Composites for Hydrogen Sensing at Room Temperature

Adjustable p‐n transition behavior based on MoO ₃ ‐decorated hollow α‐Fe ₂ O ₃ for highly hydrogen‐selective sensors