SENSORS AND ACTUATORS B-CHEMICAL
·
2024
·
IF 8
Jiacheng Xi,Kai Liang,Niu Yao,Huiyu Yuan,Junyan Cui,Xinghui Hou
Hydrogen sulfide (H 2 S) is a toxic and flammable substance that its effective real-time detection has great significance for ensuring safety. Currently, the detection of low concentration H 2 S remains a challenge. In this paper, the 3D monoclinic-tetragonal mixed phase Mo/Bi- x with hierarchical structure has been successfully prepared by a simple one-step solid-phase method for low concentration H 2 S detection. The effect of Mo doping on its morphology, structure, composition and gas sensitivity of BiVO 4 has been investigated. XRD, SEM, TEM, Raman, UV–vis and XPS techniques are employed to explore the potential sensing mechanism. The results show that the addition of Mo leads to a gradual transformation of BiVO 4 from a class cube structure to a strip structure, accompanied by partial conversion of the monoclinic phase to the tetragonal phase. For the typical sample (Mo/Bi-0.1), it exhibits extremely high response ( R g / R a ) of 43.5–10 ppm H 2 S at 200 °C, high selectivity ( Q H 2 S / methanol = 7.15 ), rapid response and recovery time of 11/15 s and relatively low theoretical detection limit (20.5 ppb). This can be attributed to the presence of unique long plate structures, abundant oxygen vacancies, chemisorbed oxygen and a monoclinic-tetragonal phase heterojunction. This research provides a potential strategy for the design of other H 2 S sensitive materials.
研究领域:
材料科学
·
传感器技术
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DOI
高影响因子
GREEN CHEMISTRY
·
2025
·
IF 9.2
Sheraz Muhammad,Bowen Yao,Aling Zhou,Zhiyang Huang,Sumayya Khan,Fengli Wei,Zuyang Luo,Tayirjan Taylor Isimjan,Xiulin Yang
Unlocking the full potential of metal-organic frameworks (MOFs) for water-splitting applications requires innovative strategies to enhance their catalytic efficiency and stability. Here, we introduce a Mo-doped Fe-based MOF (MoFe-NH2-BDC) with a unique 2D nanosheet and plate-like morphology to revolutionize the oxygen evolution reaction (OER). Mo incorporation optimizes electronic properties, accelerates charge transfer, and dynamically reconstructs the catalyst surface into highly active FeOOH species, ensuring long-term performance. This next-generation electrocatalyst achieves an ultra-low overpotential of 254 mV at 20 mA cm‒2, with a rapid Tafel slope of 66 mV dec‒1, surpassing conventional RuO2 catalysts. Operando Raman and ATR-FTIR spectroscopy reveal that Mo facilitates an adsorbate evolution mechanism (AEM), stabilizing intermediates and boosting reaction kinetics. In a practical two-electrode system, MoFe-NH2-BDC (+) || Pt/C (−) demonstrates an exceptional cell voltage of 1.58 V at 100 mA cm‒2, maintaining stability for 85 h. These results underscore the transformative impact of Mo doping in MOFs, paving the way for highly efficient, durable, and scalable electrocatalysts for sustainable energy applications.
研究领域:
材料科学
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电化学
·
能源技术
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Yu Wang,Jing Feng,Zhen-Hua Ge
Bismuth sulfide-based thermoelectric materials have attracted considerable interest owing to their abundance of raw materials and non-toxicity. However, their poor electrical properties, particularly their conductivity, have limited their practical applications. In this work, a melting method and spark plasma sintering were employed to synthesize bulk Bi 2 S 3 materials. The dopant MoCl 5 was used to regulate the electrical properties of Bi 2 S 3 . The results showed that Mo can significantly enhance the conductivity of Bi 2 S 3 compared to other transition metals. The doped sample exhibited an almost two-orders-of-magnitude rise in conductivity relative to the Bi 2 S 3 sample in its pure form. Due to its superior conductivity, the Bi 2 S 3 +1 wt% MoCl5 sample achieved an excellent power factor of 550 μW m −1 K −1 which is the maximum ever reported in the Bi 2 S 3 system. Simultaneously, the ZT value of this sample approached 0.70 at 773 K, which is a six-fold improvement compared to the pristine sample. Density functional theory was applied to understand the electronic structure changes of the Mo-doped sample, which revealed that trace amounts of MoCl 5 doping could significantly boost the density of states in the vicinity of the conduction band and shift the Fermi level to the valence band, leading to a reduction in the bandgap and an increase in free electrons. This work offers new insights into the role of Mo elements in thermoelectric materials and provides a good strategy for augmenting the thermoelectric figures of merit of other n-type thermoelectric materials with inadequate electrical conductivity in the future.
研究领域:
材料科学
·
热电材料
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DOI
高影响因子
Journal of Materials Chemistry A
·
2024
·Vol. 12
·期 48
·33640-33648
·
IF 10.7
Junli Chen,Xinyi Jin,Xinli Yang,Lei Deng,Zhiqiang Zhang,Lifeng Han,Feilong Gong,Yonghui Zhang
Ultrathin Mo-HNb3O8 nanosheets were synthesized by a facile hydrothermal process. Introducing low-valence Mo and oxygen vacancies into the pristine HNb3O8 nanosheets can modulate the band structure and induce the localized surface plasmon resonance (LSPR) to increase the charge-carrier densities and produce hot carriers derived from the non-radiative decay of LSPR, which not only efficiently promotes the separation and transfer of photo-generated carriers, but also improves the high utilization rate of solar energy in photothermal catalytic hydrogen evolution in the full solar spectrum. The optimized MoNb-10 exhibits the highest H2 evolution rate (220.4 μmol h−1 g−1), which is approximately 7.7 times higher than that of the HNb3O8 nanosheet. The current work not only deepens our understanding of LSPR effects generated from the Mo dopant and OVs on the surface of transition metal oxide nanosheets, but also provides clues for exploring new photothermal catalysts to promote future solar energy conversion.
研究领域:
材料科学
·
能源化学
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产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Xiaonan Xu,Nana Luo,Wan-Hui Wang,Ming Bao,Jiasheng Wang
Fatty acid hydrogenation is an important method for the production of fatty alcohols. The combination of Ni and Mo has been reported to be an effective and low-cost catalyst. However, the effect of Mo doping has yet to be fully understood. Here Ni-MoOx/TiO2 catalysts were prepared via simple impregnation. and the enhancement effects of Mo doping were comprehensively revealed. First, MoOx can attract electrons from Ni, reduce the electron density of Ni to improve the intrinsic activity of Ni, and form a Niδ+-(MoOx)δ− heterojunction to induce H2 heterolytic cleavage to active hydrogen ions. Second, the reduction of MoOx generates oxygen vacancies, which can absorb C═O of the fatty acid and facilitate the reaction progression. Third, a Ni1–xMox solid solution can be formed, which can increase the hydrogen adsorption quantity and accelerate the reaction rate. Finally, the bond strength of Mo–O is found to be the most optimum that can absorb the fatty acids while releasing the alcohols so as to recover the oxygen vacancies and avoid overhydrogenation. Therefore, high activity and selectivity for the hydrogenation of carboxylic acid substrates to alcohols can be obtained. Under significantly milder conditions (155 °C, 3 MPa H2) the catalyst provided a 98% yield of lauryl alcohol from lauric acid hydrogenation with a low activation energy of 40.1 kJ/mol. This work could provide an insightful understanding about the effects of Mo doping to Ni on catalyzing hydrogenation reactions.
研究领域:
催化化学
·
材料科学
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产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Peilin Wu,Lin Gao,Liuyan Dong,Zihan Lin,Lili Cui
To prepare bifunctional electrocatalyst towards HER and OER is extremely important for promoting the development of electrochemical water splitting technology. Herein, the element doping method is employed to tune the electron environment of cobalt phosphide (CoP). The Mo-doped CoP supported on carbon cloth (CC) is constructed by solvothermal and annealing method. The effect of Mo on the electron modulation of CoP during different phosphating time was studied carefully. It is noted that the Mo play an important role in tuning the electron state of Co and P elements which can trap the electron and was reduced to low valence, then transfer the electron to Co and P. With increasing the phosphating time, the electron transfer phenomenon between Mo and CoP is obvious. Benefiting from the electron engineering of Mo, Co and P as well as thin and wrinkle sheets structure, the optimal electrocatalyst only requires 39 mV and 251 mV to deliver 10 mA cm −2 for HER and OER, respectively. Also, as for the whole water splitting performance, it delivers 10 mA cm −2 at cell voltage of 1.56 V. Importantly, Faraday efficiency of the optimal catalyst achieves 99.9% for HER due to the tuned electron state of Co and P, high ECSA and low R ct .
研究领域:
电化学
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材料科学
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产品关联
DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL PHYSICS
·
2021
·Vol. 34
·期 4
·413-418
·
IF 1.114
Niu Xiao-you,Jiang Shen-long,Zhang Qun
Photocatalytic N 2 fixation has attracted substantial attention in
recent years, as it represents a green and sustainable development route toward
efficiently converting N 2 to NH 3 for industrial
applications. How to rationally design catalysts in this regard remains a
challenge. Here we propose a strategy that uses plasmonic hot electrons in the
highly doped TiO 2 to activate the inert N 2 molecules. The
synthesized semiconductor catalyst Mo-doped TiO 2 shows a
NH 3 production efficiency as high as 134
µmol · g −1 · h −1 under
ambient conditions, which is comparable to that achieved by the conventional
plasmonic gold metal. By means of ultra-fast spectroscopy we reveal that the
plasmonic hot electrons in the system are responsible for the activation of
N 2 molecules, enabling improvement the catalytic activity of
TiO 2 . This work opens a new avenue toward semiconductor
plasmon-based photocatalytic N 2 fixation.
研究领域:
材料科学
·
环境科学
·
化学
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DOI
高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2018
·Vol. 48
·期 1
·603-610
·
IF 1.566
Ao Y. C.,Shi Y.,Zhao C. Z.,Huang Y.,Shi J. Q.,Zhou K. R.,Zhou Q. J.,Li Z. P.,Wei T.
An effective route to regulate up-conversion luminescence (UCL) and polarization properties has been developed in tetragonal tungsten bronze ferroelectrics (TTBs). In this work, we have synthesized a series of (Sr 0.29 Er 0.01 )Ba 0.7 Nb 2− x Mo x O 6 (SBN-A x , 0 ≤ x ≤ 0.1) and Sr 0.3 Ba 0.7 (Nb 1.99− x Mo x Er 0.01 )O 6 (SBN-B x , 0 ≤ x ≤ 0.1) ceramics. Through investigating the UCL spectra of SBN-A x and SBN-B x ceramics, markedly different enhancement effects of UCL intensity have been revealed which can be attributed to the peculiar structural feature of TTBs. Furthermore, temperature sensing, dielectric and ferroelectric properties have also confirmed to display B -site substitution-dependent intriguing behaviors.
研究领域:
材料科学
·
光学
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DOI
高影响因子
RSC Advances
·
2019
·Vol. 9
·期 27
·15629-15634
·
IF 3.049
Jie Qi,Dechao Kong,Danyang Liu,Lun Pan,Ying Chen,Xiangwen Zhang,Ji-Jun Zou
Bismuth vanadate photoanode has shown great potential for photoelectrochemical (PEC) catalysis, but it needs to be further modified because of its relatively low charge-separation efficiency and poor stability. Herein, the bimetallic phosphide NiCoP decorated Mo–BiVO4 is fabricated through the electrodeposition and drop-casting method, which significantly improves the charge separation and surface oxidation reaction. Therefore, the fabricated NiCoP/Mo–BiVO4 photoanode exhibits a low onset potential of 0.21 V (vs. RHE) and high photocurrent of 3.21 mA cm−2 at 1.23 V (vs. RHE), which is 3.12 times higher than that of pure BiVO4. Importantly, the decoration of NiCoP significantly improve the stability of BiVO4 photoanode.
研究领域:
材料科学
·
电化学
·
催化
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产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2017
·
IF 3.582
Yuanyuan Zhao,Qunwei Tang,Benlin He,Peizhi Yang
Creation of robust and stable electrocatalysts is a persistent objective for high-efficiency hydrogen evolution by water splitting. We present here the experimental realization of one-dimensional Mo incorporated W 18 O 49 nanofibers (NFs) by a template-free solvothermal method . When utilized as electrocatalysts for hydrogen evolution through water splitting, the preliminary results demonstrate that the optimized catalytic electrode from 1 at% Mo doped W 18 O 49 NFs yields an onset overpotential of 89 mV and Tafel slope of 49 mV dec −1 as well as maximal exchange current density up to 1.60 × 10 −2 mA cm −2 . An overpotential as low as 462 mV is required to attain current density of 50 mA cm −2 in comparison with 587 mV for pristine W 18 O 49 NFs. Moreover, the Mo doped W 18 O 49 NFs display relative stability by applying a potential of 503 mV and a current density of 80 mA cm −2 over 24 h in 0.5 M H 2 SO 4 aqueous solution, making them promising in practical applications.
研究领域:
材料科学
·
化学工程
·
能源技术
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产品关联
DOI
高影响因子
Catalysis Science & Technology
·
2014
·Vol. 4
·期 11
·4010-4019
·
IF 4.76
Chao Lin,Kai Tao,Hongbo Yu,Dayin Hua,Shenghu Zhou
Molybdenum-doped mesoporous SBA-15, mesoporous SBA-15-supported MoO3/SBA-15, and traditional silica-supported MoO3/SiO2 were successfully synthesized. Various techniques, such as XRD, TEM, BET, UV-DRS, Raman, XPS and IR, were used to characterize the above obtained materials. The studies of TEM, XRD and BET confirmed that the highly ordered mesoporous structure of SBA-15 was maintained in the doped Mo-SBA-15 whereas supported MoO3/SBA-15 showed a significant reduction in surface area due to the deposition of MoO3 nanoparticles into the SBA-15 channels. XPS studies revealed that a high concentration of Mo5+ species appeared in doped Mo-SBA-15 whereas supported MoO3/SBA-15 and MoO3/SiO2 only contained Mo6+ species. The metathesis reaction of 1-butene and ethene to propene was used to evaluate the catalytic performance of Mo-containing materials. The doped Mo-SBA-15 illustrated a superior catalytic performance over the supported MoO3/SBA-15 and MoO3/SiO2 catalysts. The enhancement of catalytic performance for doped Mo-SBA-15 was assigned to the incorporation of Mo species into the SBA-15 framework. Due to the doping method, Mo-SBA-15 exhibited a well-ordered mesoporous structure, a high surface area, and a high concentration of Mo5+ species, which is beneficial to the catalytic performance for metathesis reactions.
研究领域:
材料科学
·
催化化学
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产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Liyan Wang,Xiangdong Xue,Qingjie Luan,Junzhen Guo,Liang Chu,Zhaokun Wang,Baozhen Li,Mu Yang,Ge Wang
Accelerating charge transfer efficiency by constructing heterogeneous interfaces on metal-based substrates is an effective way to improve the electrocatalytic performance of materials. However, minimizing the substrate-catalyst interfacial resistance to maximize catalytic activity remains a challenge. This study reports a simple interface engineering strategy for constructing Mo-Ni 9 S 8 /Ni 3 S 2 heterostructured nanoflowers . Experimental and theoretical investigations reveal that the primary role assumed by Ni 3 S 2 in Mo-Ni 9 S 8 /Ni 3 S 2 heterostructure is to replace nickel foam (NF) substrate for electron conduction, and Ni 3 S 2 has a lower potential energy barrier (0.76 to 1.11 eV) than NF (1.87 eV), resulting in a more effortless electron transfer. The interface between Ni 3 S 2 and Mo-Ni 9 S 8 effectively regulates electron redistribution, and when the electrons from Ni 3 S 2 are transferred to Mo-Ni 9 S 8 , the potential energy barriers at the heterogeneous interface are 1.06 eV, lower than that between NF and Ni 3 S 2 (1.53 eV). Mo-Ni 9 S 8 /Ni 3 S 2 -0.1 exhibited excellent oxygen evolution reaction (OER)/hydrogen evolution reaction (HER) bifunctional catalytic activity in 1 M KOH, with overpotentials of only 223 mV@100 mA cm −2 for OER and 116 mV@10 mA cm −2 for HER . Moreover, when combined with an alkaline electrolytic cell, it required only an ultra-low cell voltage of 1.51 V to drive a current density of 10 mA cm −2 . This work provides new inspirations for rationally designing interface engineering for advanced catalytic materials.
研究领域:
材料科学
·
电催化
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产品关联
DOI
PubMed
高影响因子
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