SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2024
·
IF 4.3
Cheng Cheng,Zhaokang Zheng,Zhen Liu,Zhiwei Chen,Xingying Li,Weiyong Liu,Aiwu Wang,Cangtao Zhou
Improving the ease of operation and portability of hydrogen peroxide (H 2 O 2 ) detection in daily production and life holds significant application value. However, it remains a challenge to achieve rapid colorimetric detection of H 2 O 2 and color change quantification. In this study, we achieved rapid and visual detection of H 2 O 2 by MoOx (2 ≤ x ≤ 3) nanoparticles with rich oxygen vacancies using machine vision. As the concentration of H 2 O 2 increases, the detection system exhibited a visible multi-color change from blue to green and then yellow and the absorption peak near 680 nm measured by the UV–visible spectrophotometer gradually decreased. With excellent sensitivity, a wide linear range of 0.1–600 μmol/L, concentrations as low as 0.1 μmol/L can be detected with good selectivity towards H 2 O 2 . The sensing mechanism of detecting H 2 O 2 by the change of oxygen vacancies in MoOx was revealed through characterization methods such as XPS, EPR, and DFT. In addition, the Hue, Saturation, Value (HSV) visual analysis system based on MoOx was constructed to assist in the rapid, portable, and sensitive monitoring of H 2 O 2 in practical application scenarios. This work offers an easy-to operate, low cost, and convenience for achieving rapid colorimetric determination of H 2 O 2 and has broad application prospects in daily life and industrial production.
研究领域:
分析化学
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材料科学
·
生物医学工程
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产品关联
DOI
PubMed
高影响因子
CRYSTENGCOMM
·
2023
·Vol. 25
·期 31
·4480-4486
·
IF 3.1
Yangyang Wang,Xin Wen,Xiaojing Dong,Chen Xu,Wenguang Ma,Yiqiang Sun,Bo Xu,Cuncheng Li
The development of a bifunctional ruthenium-based electrocatalyst that can efficiently and economically drive both the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) remains challenging because ruthenium species can undergo severe agglomeration during preparation which can significantly reduce the catalytic activity. Constructing supported metal catalysts can not only improve the stability of Ru but also improve the catalytic performance by adjusting the electronic structure, which is an effective way to solve the current challenges. In this paper, Ru-loaded MoO2/MoO3 heterostructures (Ru–MoOx) with oxygen vacancies were successfully synthesized by controlling the annealing temperature. This special structure can effectively tune the electronic structure, enhance the electrical conductivity and increase the active sites, thus improving the catalytic activity of the catalyst. Performance studies have shown that Ru–MoOx exhibits excellent HER and OER performance in alkaline media. And it is not surprising that the overall water decomposition performance of Ru–MoOx is also excellent, requiring only a cell voltage of 1.54 V to reach 10 mA cm−2.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Catalysis Science & Technology
·
2020
·Vol. 10
·期 5
·1368-1375
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IF 5.721
Cankun Jiang,Lulu Zhang,Fan Gao,Xueyan Huang,Rui Lei,Yun Ye,Jie Yuan,Ping Liu
A CdS@MoOx core–shell nanorod photocatalyst has been constructed by a one-step in situ photodeposition method, which effectively utilizes the photoproduced-hole-induced dehydration and condensation of Mo–O–H derived from the hydrolyzed product of MoCl5, to successfully deposit a layer of MoOx on the surface of CdS NRs. X-ray photoelectron spectroscopy further confirmed that S–Mo bonds serve as bridges for carrier transport between the core and the shell, significantly reducing the interface impedance and improving the carrier transmission efficiency. Due to the superior interfacial carrier separation as well as the enhanced light absorption, the optimal CdS@MoOx-0.9 nanocomposite exhibits a high hydrogen production performance (5.42 mmol g−1 h−1) under visible light irradiation (λ > 400 nm). We have experimentally shed light on the mechanism of this excellent enhancement performance in detail. Moreover, our work can broaden the range of construction and application of developing other photocatalytic materials containing transition metal oxides.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
Advanced Materials Interfaces
·
2020
·Vol. 7
·期 19
·2000754
·
IF 4.948
Wenzhong Fang,Pan Wang,Zitao Ni,Tao Sun,Chaoyu Xiang,Kun Yue,Rongfei Wang,Jie Yang,Yao Zhou,Chong Wang,Yu Yang
Poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) hole injection layer plays an important role in planar Si/PEDOT:PSS heterojunction solar cells (HSCs). Herein, a MoO x mixed aqueous PEDOT:PSS cosolvent is developed and is applied into a Si/PEDOT:PSS solar cell preparation via a time-saving one-step spin-coating method. With an optimal concentration of MoO x dopants, the power conversion efficiency of the device exhibits from 10.26% up to 13.82% with all inherent photovoltaic parameters enhanced. The detailed characterization and analytical results indicate that an advanced electronic property is produced by MoO x dopants and interface optimization caused by synergistic effects from Mo 5+ and Mo 6+ species with PEDOT:PSS, which enhances its interface work function and promotes hole transportation capacity. The result paves a path for exploring efficient Si/PEDOT:PSS HSCs with suitable functional material and a simple solution-processable method.
研究领域:
材料科学
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光伏技术
·
有机电子学
✓ 已验证
产品关联
DOI
高影响因子
Catalysis Science & Technology
·
2015
·Vol. 5
·期 4
·2260-2269
·
IF 5.426
Qiulin Zhang,Xin Liu,Ping Ning,Zhongxian Song,Hao Li,Junjie Gu
Mesoporous Ce–Ti–MoOx catalysts have been prepared by stabilization with an in situ formed carbon template and used for selective catalytic reduction of NOx with NH3 (NH3-SCR). The Ce–Ti–MoOx catalysts were characterized by N2 adsorption–desorption, XRD, HR-TEM, H2-TPR and XPS analysis. It was found that the stabilization with a carbon template obviously improved the NOx conversion of the Ce–Ti–MoOx catalyst and the pore distribution. The Ce–Ti–MoOx catalyst stabilized with a carbon template at 850 °C in N2 exhibited the best NH3-SCR activity and showed a uniform mesopore distribution, and more than 90% NOx conversions were obtained at 175–425 °C with a GHSV of 60 000 h−1. The high stabilization temperature with a carbon template in N2 not only led to an increase in specific surface area, pore volume and low-temperature SCR activity, but also contributed to the enhanced redox properties, highly dispersed titanium or molybdenum species and narrow mesopore distribution. The treatment of Ce–Ti–MoOx with a high calcination temperature for removal of the carbon template led to a drastic decrease in surface area, an abrupt decrease in surface oxygen and cerium, production of rutile TiO2, and a correspondingly low SCR activity.
研究领域:
环境科学
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催化化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Yiqian Cui,Yuchen Xiong,Jiawen Wang,Yu Zhang,Wei Yu
The formation of ohmic contact between the carrier transport layer and the electrode is necessary for the high-performance solar cells. However, in the PEDOT: PSS/Si hybrid solar cells, the low conductivity of PEDOT: PSS and the high contact barrier between PEDOT: PSS and Ag electrodes result in high contact resistance, which inhibits the improvement of cell efficiency. In this work, the above two issues were improved simultaneously by simply introducing a MoO X interface layer between PEDOT: PSS and Ag electrodes. The detailed characterization and analytical results show that the quinoid structure of PEDOT: PSS films and the Mo 5 + with metallization electricity properties increased significantly due to the interaction between PEDOT: PSS and MoO X , reducing the resistivity of PEDOT: PSS. At the same time, the contact potential barrier was reduced due to the formation of MoO X /Ag composite electrodes with high work function (WF). In addition, the PEDOT: PSS/MoO X films with higher WF led to a higher built-in electric field. Due to these collaborative improvements, a PEDOT: PSS/Si solar cell with a high power conversion efficiency (PCE) of 15.02 % was achieved. This work provides a new idea to modify the interface between PEDOT: PSS and Ag electrodes for improving the PCE of PEDOT: PSS/Si hybrid solar cells.
研究领域:
材料科学
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能源技术
·
界面工程
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2021
·
IF 4.094
Hualun Lv,Xudong Zhang,Jialin Cai,Xin Xie,Yunxiao Fan,Leyan Liu,Jie Ding,Qiang Cai,Yushan Liu
Generally, bi-functionalal electrocatalysts used for overall water splitting (OWS) have good hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) performance. Herein, RuSe 2 /MoO x composite (RSMC) is constructed through a simple and convenient solid phase reaction (SPR) strategy, and is further studied as a potential electrocatalyst for OWS. At first, we prepared RuO 2 /MoSe 2 composite (RMC) precursor. When the RMC was heat-treated in a N 2 atmosphere, the SPR occurred between RuO 2 and MoSe 2 . Therefore, RMC was converted into RuSe 2 /MoO x composite (RSMC) in-situ , accompanied by the formation of oxygen vacancies (V O ) in the MoO x phase. In this work, the overpotential of RSMC-500 (prepared by annealing the RMC precursor at 500 °C in a N 2 atmosphere) at 10 mA cm −2 under alkaline conditions (1 M KOH) are 58 (HER) and 270 mV (OER), respectively. When using RSMC-500 as anode and cathode materials to make an electrolytic cell , a low cell voltage of 1.57 V is required under alkaline condition to achieve the current density of 10 mA cm −2 . The good performance shows the potential application of RSMC-500 in the field of renewable and clean energy area.
研究领域:
材料科学
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电化学
·
可再生能源
✓ 已验证
产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2024
·
IF 3.8
Cheng Cheng,Zhaokang Zheng,Aiwu Wang
Photochromic smart windows allow for simple manufacturing without the need for additional energy input for adaptive control of sunlight, which will have a huge impact on the comfort of daylight and the development of smart windows. Among them, although molybdenum-based materials have advantages such as low cost and stable coloring, the lack of fast transmission switching capability and liquid phase color changing environment limit its implementation in the field of smart windows. Here, we report a low-cost method to fabricate a novel photochromic hydrogel (MoOx/PVA) by combining molybdenum oxide nanosheets (MoOx, 2 ≤ x ≤ 3) with polyvinyl alcohol (PVA) gel. Under ultraviolet light (UV = 360–400 nm) irradiation, the hydrogel achieves rapid color change visible to the naked eye within 10 s, with an exponential decrease in transmittance, reversible switching of transparency between 70 % and 5 %, and retains about 95 % transmittance after 14 cycles. Due to the good biocompatibility of molybdenum oxide, hydrogel can also be used for personal wearable, which can achieve 1.4 °C of cooling when exposed to sunlight for 3 min. Moreover, the photochromic and recovery properties of the large-sized (29.7 cm × 21 cm) MoOx/PVA hydrogel demonstrate its broad prospects for production applications in smart windows. It is believed that this study will open new opportunities for both fabrication and application in photochromic smart windows and intelligent devices.
研究领域:
材料科学
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光电技术
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纳米技术
·
智能材料
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 27
·16311-16318
·
IF 3.108
Yue Yang,Qiying Liu,Dan Li,Jin Tan,Qi Zhang,Chenguang Wang,Longlong Ma
Selective hydrogenation of 5-hydroxymethylfurfural (HMF) has potential application in high quality biofuels. Herein, the catalytic hydrodeoxygenation (HDO) of HMF to 2,5-dimethylfuran (DMF) was investigated using bi-functional Ru–MoOx/C catalyst prepared by initial wetness impregnation. The high dispersion and electronic transfer between Ru and MoOx were demonstrated by a series of characterization techniques. During this HDO process, the synergy effect between metallic Ru and acidic MoOx species in the Ru–MoOx/C catalyst plays an essential role in obtaining maximized target product DMF (79.4%) via effective aldehyde group hydrogenation by Ru followed by dehydration over MoOx. This work also elucidated that DMF production proceeded through two distinct pathways: the 2,5-hydroxymethyl furan intermediate was preferable by the aldehyde group hydrogenation of HMF over the Ru–MoOx/C catalyst. Over MoOx/C catalyst, comparatively, 5-methyl furfural was the key intermediate by direct hydrogenolysis of the hydroxyl group in HMF. This kind of catalyst is stable for the first two runs by maintaining the target product yield. After the third run, the catalyst showed deactivation gradually but could be almost completely recovered after regeneration by H2 reduction.
研究领域:
催化
·
化学工程
·
生物燃料生产
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MICROMECHANICS AND MICROENGINEERING
·
2019
·Vol. 29
·期 6
·065012
·
IF 2.141
Ranran Zeng,Hong Liu,Wenzhong Shen
Non-stoichiometric transition metal oxides have received considerable attention because of their excellent optical and electrical properties for novel high performance opto-electronic devices or photocatalysis, among which MoOx was one promising candidate. However, few studies have been focused on its evolution under different controlling parameters and ambient conditions. In this work, we report a facile electrochemical method for smooth and uniform non-stoichiometric MoOx films, with effective control of the morphology, chemical composition and microstructure of molybdenum simply by a few physical/chemical parameters. The modification of roughness, crystallinity, oxygen vacancy concentration can play an important role in their opto-electronic performances, e.g. in the perovskite solar cells. As a result, a conversion efficiency of 9.20% could be obtained by control of oxygen vacancies and crystallinity and could be further improved with the change of transparencies. Furthermore, its wetting properties could be significantly influenced for further applications, especially for fabrication of novel detectors and perovskite solar cells.
研究领域:
材料科学
·
光电材料
·
能源器件
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2021
·
IF 5.706
Cen Tang,Fangru Zhou,Yang Wen,Yumeng Xu,Aiping Jia,Mengfei Luo,Jiqing Lu
A series of MoO x -promoted Ir/BN catalysts were tested for liquid phase selective hydrogenation of crotonaldehyde. The MoO x -promotion could significantly improve the reactivity up to 5-fold. Such improvement was mainly due to the formation of Ir-MoO x interfacial sites in the promoted catalyst, which accelerated the adsorption and activation of crotonaldehyde molecule as evidenced by a much lower activation energy (18.9 kJ mol −1 on the 0.3Mo-3Ir/BN versus 38.4 kJ mol −1 on the 3Ir/BN). The kinetic results revealed negative reaction order of crotonaldehyde (up to -1.1) and high reaction order of H 2 (up to 2.2), indicating the high coverage of crotonaldehyde on the catalyst surface suppressed the adsorption of H 2 due to its low solubility in the liquid phase. Therefore, the adsorption and activation of H 2 on the catalyst might be the rate determining step. However, the preferred adsorption of crotonaldehyde on the Ir-MoO x interface alleviated the suppression of H 2 adsorption, which was another reason for the higher activity.
研究领域:
催化化学
·
材料科学
·
表面科学
✓ 已验证
产品关联
DOI
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2024
·
IF 2.9
Kaibo Yuan,Qinqin Qian,Miaomiao Wu,Bingxia Wang,Shuwen Zeng,Dong Chen,Muhammad Danang Birowosuto,Diing Shenp Ang,Chenjie Gu
Active control the surface-enhanced Raman scattering (SERS) enhancement shows great potential for realizing smart detection of different molecules. However, conventional methods usually involve time-consuming structural design or sophisticated fabrication process. Herein, we reported an electrically tunable field effect transistor (FET) comprised by WOx/MoOx hybrid as the SERS active layer. In the experiment, WOx/MoOx hybrid were first prepared by mixing different molar ratios of WOx and MoOx oxides. Then, R6G molecules was used as the Raman reporter, it showed that the intensity of the SERS signal observed on the most optimal hybrids (molar ratio = 1:3) could be promoted by two times as high as that observed on a single WOx or MoOx based substrate, which was ascribed to enhanced charge transfer efficiency by the constructed nano-heterojunction between the WOx and MoOx oxides. Thereafter, a back-gate FET was fabricated on a SiO2/Si substrate, and the most optimal WOx/MoOx hybrid was deposited as the gate channel as well as the SERS active layer. After that, a series of gate bias (from -15 V to 15 V) were implemented to actively tune the SERS performance of the FET. It evidenced that SERS EF can be further tuned from 2.39 × 107 (-15 V) to 6.55 × 107 (+10 V), which is ~7.4 / 4.1 times high than that observed on the pure WOx device (8.81 × 106) or pure MoOx (1.61 × 107) device, respectively. Finally, the mechanism behind the electrical tuning strategy was investigated. It revealed that a positive voltage would bend the conduction band down, which raised the electron density near the Fermi level. Consequently, it triggered the resonance charge transfer and significantly improved the SERS performance. On the contrary, a negative gate voltage attracted the holes to the Fermi level, which deferred the charge transfer process, and caused the degradation of the SERS enhancement.
研究领域:
材料科学
·
物理化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）