Tailoring selenium vacancies in MoSe<sub>2</sub> through oxygen passivation for room-temperature NO<sub>2</sub> sensing enhancement

Zheng, Shengliang; Yin, Dongmin; Zhang, Shengpei; Wang, You; Li, Jiayu; Wang, Zhengjia; Yuan, Ye; Tsai, Hsu-Sheng; Hao, Juanyuan

doi:10.1039/d3ta03020b

Cited by 6 publications

(3 citation statements)

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“…However, in V Se -Zn 0.4 Ni 0.6 Se 2 -2H, the density of bright spots was reduced due to the increased particle size after calcination (Figure D). Further, the occurrence of V Se in Zn 0.4 Ni 0.6 Se 2 was also confirmed by lower bright spot density after calcination …”

Section: Resultsmentioning

confidence: 73%

“…Further, the occurrence of V Se in Zn 0.4 Ni 0.6 Se 2 was also confirmed by lower bright spot density after calcination. 63 Investigation Using Density Functional Theory (DFT). In order to fully comprehend how the creation of V Se in Zn x Ni 1−x Se 2 largely triggers the HER activity in comparison to pure Zn x Ni 1−x Se 2 and NiSe 2 , first-principles calculations were performed.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Structural Modulation through Se Vacancies on Zn-Doped NiSe₂ Nanoparticles for Expediting Electrocatalytic Hydrogen Evolution

Kareem,

Thenmozhi,

Ramasamy

et al. 2024

ACS Appl. Energy Mater.

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Several distinctive approaches have been continuously explored in order to promote the electrocatalytic efficacy of transition metal chalcogenides. Herein, we envisioned to trigger the electrocatalytic HER activity of a chalcogenide, i.e., NiSe 2 , through zinc doping and subsequent creation of selenium vacancies (V Se ) on the Zn-doped NiSe 2 . Zn-doping on an electrocatalyst could judiciously tune its electronic structure, and subsequent creation of V Se would afford active sites for hydrogen adsorption, thus facilitating the overall electrochemical HER process. Zn-doped NiSe 2 nanoparticles (Zn x Ni 1−x Se 2 NPs) with different amounts of Zn (as dopant) were synthesized, among which Zn 0.4 Ni 0.6 Se 2 NPs exhibited maximum electrocatalytic HER activity. Thereafter, Zn 0.4 Ni 0.6 Se 2 NPs were calcined at 400 °C for different time periods to induce different amounts of V Se . Interestingly, Zn 0.4 Ni 0.6 Se 2 NPs calcined for 2 h (V Se -Zn 0.4 Ni 0.6 Se 2 -2H NPs) demonstrated a superior electrochemical HER performance compared to all the synthesized catalytic materials with a lesser overpotential and Tafel slope of 123 mV at 10 mA cm −2 and 37.1 mV dec −1 . Theoretical calculations using the first-principles method were well in accordance with the experimental observations, wherein the V Se -Zn x Ni 1−x Se 2 NPs as electrocatalysts portrayed the lowest hydrogen adsorption free energy in the energy profile. Additionally, V Se -Zn 0.4 Ni 0.6 Se 2 -2H NPs sustained excellent stability for 12 h in 0.5 M H 2 SO 4 .

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Section: Resultsmentioning

confidence: 73%

Section: ■ Results and Discussionmentioning

confidence: 99%

Structural Modulation through Se Vacancies on Zn-Doped NiSe₂ Nanoparticles for Expediting Electrocatalytic Hydrogen Evolution

Kareem,

Thenmozhi,

Ramasamy

et al. 2024

ACS Appl. Energy Mater.

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“…Gas sensing properties were obtained using a homemade gas sensor test system, as in our previous work [39]. The dynamic gas sensor test system was employed to investigate the sensing mechanism (Figure S2).…”

Section: Gas Sensing Measurementsmentioning

confidence: 99%

Nanorods Assembled Hierarchical Bi2S3 for Highly Sensitive Detection of Trace NO2 at Room Temperature

Yang,

Liu,

Wang

et al. 2024

Chemosensors

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The bismuth sulfide nanostructure has become a promising gas sensing material thanks to its exceptional intrinsic properties. However, pristine Bi2S3 as a room-temperature sensing material cannot achieve the highly sensitive detection of ppb-level NO2 gas. Herein, 1D nanorods with self-assembled hierarchical Bi2S3 nanostructures were obtained via a simple hydrothermal process. The as-prepared hierarchical Bi2S3 nanostructures exhibited outstanding NO2 sensing behaviors, such as a high response value (Rg/Ra = 5.8) and a short response/recovery time (τ90 = 28/116 s) upon exposure to 1 ppm NO2. The limit of detection of hierarchical Bi2S3 was down to 50 ppb. Meanwhile, the sensor exhibited excellent selectivity and humidity tolerance. The improved NO2 sensing properties were associated with the self-assembled hierarchical nanostructures, which provided a rich sensing active surface and accelerated the diffusion and adsorption/desorption processes between NO2 molecules and Bi2S3 materials. Additionally, the sensing response of hierarchical Bi2S3 nanostructures is much higher at 100% N2 atmosphere, which is different from the chemisorption oxygen model.

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Nanoparticles anchored strategy to develop 2D MoS2 and MoSe2 based room temperature chemiresistive gas sensors

Kumar,

Mirzaei,

Kumar

et al. 2024

Coordination Chemistry Reviews

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Tailoring selenium vacancies in MoSe₂ through oxygen passivation for room-temperature NO₂ sensing enhancement

Abstract: Vacancy defects are intrinsically presented in the as-grown MoSe2, which may greatly affect its gas sensing performance. However, it remains ambiguous how do their concentrations influence the sensing properties. The...

Cited by 6 publications

References 71 publications

Structural Modulation through Se Vacancies on Zn-Doped NiSe₂ Nanoparticles for Expediting Electrocatalytic Hydrogen Evolution

Structural Modulation through Se Vacancies on Zn-Doped NiSe₂ Nanoparticles for Expediting Electrocatalytic Hydrogen Evolution

Nanorods Assembled Hierarchical Bi2S3 for Highly Sensitive Detection of Trace NO2 at Room Temperature

Nanoparticles anchored strategy to develop 2D MoS2 and MoSe2 based room temperature chemiresistive gas sensors

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Tailoring selenium vacancies in MoSe2 through oxygen passivation for room-temperature NO2 sensing enhancement

Abstract: Vacancy defects are intrinsically presented in the as-grown MoSe2, which may greatly affect its gas sensing performance. However, it remains ambiguous how do their concentrations influence the sensing properties. The...

Cited by 6 publications

References 71 publications

Structural Modulation through Se Vacancies on Zn-Doped NiSe2 Nanoparticles for Expediting Electrocatalytic Hydrogen Evolution

Structural Modulation through Se Vacancies on Zn-Doped NiSe2 Nanoparticles for Expediting Electrocatalytic Hydrogen Evolution

Nanorods Assembled Hierarchical Bi2S3 for Highly Sensitive Detection of Trace NO2 at Room Temperature

Nanoparticles anchored strategy to develop 2D MoS2 and MoSe2 based room temperature chemiresistive gas sensors

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Tailoring selenium vacancies in MoSe₂ through oxygen passivation for room-temperature NO₂ sensing enhancement

Structural Modulation through Se Vacancies on Zn-Doped NiSe₂ Nanoparticles for Expediting Electrocatalytic Hydrogen Evolution

Structural Modulation through Se Vacancies on Zn-Doped NiSe₂ Nanoparticles for Expediting Electrocatalytic Hydrogen Evolution