DIAMOND AND RELATED MATERIALS
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2023
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IF 4.1
Yingjie Huang,Zuoyi Xiao,Shangru Zhai,Qingda An
The development of a simple and convenient method for synthesizing photocatalysts for the degradation of tetracycline remains a great challenge. In this work, a Cu-MoO 2 @C composite was successfully synthesized by a high-temperature carbonization of ammonium molybdate infiltrated copper alginate aerogel , which was obtained by curing a mixture of sodium alginate and ammonium molybdate using Cu 2+ ions. The photocatalytic properties of the prepared composites were evaluated by the degradation of tetracycline. The results showed that the introduction of Cu nanoparticles on the MoO 2 @C hybrid could significantly improve the catalytic performance, and the degradation rate of tetracycline reached 92.48 % after 60 min light exposure. Tetracycline's estimated photodegradation rate constant, which was 0.04013 min −1 , was 5 times more than that of the composite without Cu loading. Furthermore, the reaction mechanism was explored by electron spin resonance (ESR) test and free radical capture reagent. Intermediate products of tetracycline degradation were analyzed by liquid mass spectrometry (LC-MS).
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
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2023
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IF 7.7
Xun Li,Yue Meng,Jinhua Li,Lianyang Zhang,Bo Xie,Zheming Ni,Shengjie Xia
Photocatalytic activation of persulfate for the synergistic degradation of pollutants has become a major research hotspot, but the activation effect is poor due to the problems of low catalyst carrier separation efficiency and insufficient active sites. In this study, direct Z-Scheme heterojunctions of MoO 2 @CoFe LDHs were prepared by a simple hydrothermal method and a Co and Fe dual active site system was constructed to activate Na 2 S 2 O 8 (PS) for the synergistic degradation of tetracycline under visible light. The results showed that the synergistic degradation of tetracycline was 3.7 times and 2.7 times more efficient than the original heterojunction and PS, respectively. Combining material characterisation, photovoltaic performance tests and theoretical calculations revealed that the high efficiency is attributed to the formation of an internal electric field under the Z-Scheme heterostructure type generating effective electron-hole separation, with more photo-generated electrons converted into radicals acting together with holes to degrade the TC and activate the PS. More importantly, Co(II) and Fe(II) provide electrons to synergistically activate PS, and a portion of the photogenerated electrons and PS activation intermediates can facilitate cycling between Co(II)/Co(III) and Fe(II)/Fe(III) to accelerate PS activation. This paper's work on activating PS-assisted Z-Scheme heterojunctions for the efficient degradation of TC provides a reference for the study of high-performance photocatalytic catalysts for the degradation of organic pollutants .
研究领域:
环境科学
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材料科学
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化学
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产品关联
DOI
高影响因子
CARBON
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2024
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IF 10.5
Rui Xue,Di Lan,Rong Qiang,Zicheng Zang,Junwen Ren,Yulong Shao,Lei Rong,Junwei Gu,Jingbo Fang,Guanglei Wu
Dielectric-dielectric nanocomposites with excellent synergistic effects are considered as a prospective avenue for the development of high-performance microwave absorbers. In this work, one-dimensional MoO 2 /Mo 2 C/C heterogeneous nanowires were synthesized via a straightforward co-precipitation and in situ pyrolysis process. The components were modulated by adjusting the reduction temperatures to achieve tunable electromagnetic parameters thereby optimizing the dielectric loss. The results showed that the optimized MoO 2 /Mo 2 C/C composite exhibited a minimum reflection loss of −50.7 dB at an ultra-thin thickness of 1.8 mm and an effective absorption bandwidth of 6 GHz at 2.3 mm when the calcination temperature was 700 °C. Based on the studies of electromagnetic parameters and radar cross section simulation outcomes, both the interwoven one-dimensional structure and synergistic effects between the components have endowed the material with good impedance matching and introduced various loss mechanisms such as conductivity loss, multiple polarization relaxation, and multiple reflection/scattering. This work presented a viable strategy for the preparation of one-dimensional MoO 2 -based dielectric microwave absorption materials.
研究领域:
材料科学
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电磁学
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产品关联
DOI
高影响因子
Materials Today Physics
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2023
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IF 11.5
Lin Long,Xiaosi Qi,Lei Wang,Shaohong Cai,Mingsen Deng
Magnetic-dielectric nanocomposites with excellent synergetic effect were deemed as the ideal candidates for high-performance microwave absorbers (MAs). Herein, we adopted a simple hydrothermal route and hydrogenous reduction to synthesize magnetic-dielectric CoFe@MoO 2 /MoS 2 flower-like multicomponent nanocomposites (MCNCs). By controlling the different reduction temperature and time, the content of component (i.e., CoFe, MoO 2 and MoS 2 ) can be easily tuned, which is conducive to adjust electromagnetic parameter and optimize magnetic loss. Results demonstrated that the CoFe@MoO 2 /MoS 2 flower-like MCNCs could be easily regulated by simply changing the content of CoFe in favor of improved magnetic loss and optimized impedance matching. So, the prepared magnetic-dielectric CoFe@MoO 2 /MoS 2 flower-like MCNCs presented the minimum reflection loss of −55.91 dB and the widest effective bandwidth of 7.24 GHz. The strategies for adjusting rich interfaces and optimized magnetic loss are very instructive for the development of high-performance MAs and devices.
研究领域:
材料科学
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电磁学
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产品关联
DOI
高影响因子
DALTON TRANSACTIONS
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2023
·Vol. 52
·期 33
·11458-11464
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IF 4
Xuejiao Li,Bo Li,Wenbo Zhang,Zimo Chen,Jinping Liu,Yu Shi,Huanyan Xu,Lianwei Shan,Xin Liu,Limin Dong
Phototherapy, including photothermal and photodynamic therapy, has gained extensive attention in the tumor treatment field recently, while synergistic therapy can significantly improve curative effects. However, a complicated photo-responsive nanosystem, different excitation wavelengths, and low tissue depth hindered its actual application. Herein, single near-infrared responsive PEGylated defective MoO2 nanocrystals were fabricated by a green hydrothermal method. The photothermal and photodynamic performances of the samples were presented in detail under a safe power of 1064 nm (NIR-II, 1.0 W cm−2). Interestingly, the photodynamic properties were prompted by the localized surface plasmon resonance (LSPR) photothermal effect obviously, and the collaborative enhancement mechanism was explored in depth. Subsequently, the in vitro cytotoxicity was evaluated on the 4T1 cancer cells under NIR-II irradiation. This work may provide guidance for the facile fabrication of TMOs for NIR-II responsive and enhanced dual-modal phototherapy.
研究领域:
肿瘤治疗
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纳米医学
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生物材料
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
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2021
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IF 6.707
Mengmeng Yang,Qingquan Kong,Wei Feng,Weitang Yao,Qingyuan Wang
Due to its relatively high theoretical capacity and low cost, transition metal oxides are considered as candidate anodes for potassium ion batteries (KIB). However, poor recyclability due to inherently large volume changes hinders their application. Therefore, we use Ganoderma spores as the carbon matrix to synthesize MoO 2 /N/C composites through simple complexation reactions. It was found that the synergistic effect of cage-like biomass carbon and molybdenum oxide can promote the transfer and adsorption of potassium ions, thereby improving the storage capacity of potassium ions. On the one hand, the introduction of a small amount of MoO 2 greatly enhances the potassium storage capacity of biomass carbon materials. On the other hand, the porous cage-like carbon structure effectively buffers the volume change during the MoO 2 potassium storage process and provides more diffusion paths for K + . In addition, the stable double-walled cage structure provides the possibility for the composite material to achieve good long-cycle performance. Specifically, MoO 2 /N/C composites provided a high reversible specific capacity of 422 mAh g −1 (after 200 cycles) at 200 mA g −1 , and coulombic efficiency was greater than 98%. The composites still provided a high capacity of 316 mAh g −1 after 500 cycles at 500 mA g −1 . At the same time, after 1500 cycles at 2000 mA g −1 , the capacity was maintained at 248 mAh g −1 . Verify the possibility of its practical application by assembling a full battery, meanwhile, through first-principles calculations, the reasons for the excellent potassium storage performance of MoO 2 /N/C electrodes are discussed.
研究领域:
材料科学
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电化学
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能源存储
✓ 已验证
产品关联
DOI
高影响因子
RARE METALS
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2024
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IF 9.6
Cai Jia-Lin,Fan Jing-Yi,Zhang Xu-Dong,Xie Xin,Tian Wan-Yu,Zhang Xin-Gang,Ding Jie,Liu Yu-Shan
Efficient bifunction electrocatalyst is extremely interesting for electrochemical overall water splitting (OWS). Herein, a new RuO 2 -Ru/MoO 2 @CC (RRM/CC) bifunctional electrocatalyst was prepared via a solid phase reaction strategy. To obtain a suitable precursor for SPR, MoS 2 nanosheets and RuO 2 nanoparticles (NPs) were sequentially loaded onto carbon cloth conductive substrate. Subsequently, the prepared RuO 2 /MoS 2 /CC precursor was sealed in a furnace and annealed in Ar to trigger the redox SPR. After SPR, active RuO 2 -Ru/MoO 2 units containing metal–metal oxide interfaces were formed on CC substrate uniformly. The optimized RRM/CC sample annealed at 400 °C exhibited a overpotential of 13 mV for hydrogen evolution reaction (HER) and 231 mV for oxygen evolution reaction (OER) at 10 mA·cm −2 under alkaline condition, respectively, which can be deduced to the modulated electronic structure and unique hierarchical structure. In addition, a low cell voltage of 1.48 V for OWS was required at 10 mA·cm −2 under alkaline condition. Meanwhile, RRM/CC exhibited excellent pH-independent durability. Graphical abstract
研究领域:
材料科学
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电化学
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DOI
高影响因子
Canadian Journal of Chemistry
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2020
·Vol. 99
·期 3
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IF 1.171
Jianfa Chen,Tianxiang Jin,Hangchun Deng,Jie Huang,Guangyuan Ren,Yong Qian
In this work, MoO2@NPGA nanocomposites were successfully prepared via a simple hydrothermal and calcination route. The as-prepared MoO2@NPGA composites exhibit a synergistic effect between MoO2 and N,P-codoped graphene aerogels, which can significantly improve the electrochemical performance of the MoO2@NPGA electrodes. Moreover, the results also proved that the mass loading of MoO2 has a huge effect on the electrochemical properties of MoO2@NPGA composites. With an appropriate amount of MoO2, the MoO2@NPGA composite shows a high specific capacitance (335 F g−1 at 1 A g−1) and excellent cycle stability (capacitance remains at 88% after 6000 cycles). Furthermore, the assembled symmetric supercapacitor displays a high energy density of 23.75 W h kg−1 at a power density of 300 W kg−1 and can maintain an energy density of 17.1 W h kg−1 when the power density reaches up to 6005 W kg−1.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2019
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IF 8.355
Junmei Liang,Tao Chen,Jiapeng Liu,Qicheng Zhang,WenChao Peng,Yang Li,Fengbao Zhang,Xiaobin Fan
Chemoselective hydrodeoxygenation (HDO) of lipids to diesel-like hydrocarbons is important for biomass to biofuel conversion. Here we design a new Ni-based catalyst (Ni/MoO 2 @Mo 2 CT x ) with extraordinary catalytic performance in the HDO of palmitic acid. To relieve the loss of C atom for Ni-based catalyst, partial oxidation of Mo 2 CT x MXene was used as a novel support. As a result, the catalytic activity and selectivity ratio of hexadecane/pentadecane (C 16 /C 15 ) were enhanced over Ni/MoO 2 @Mo 2 CT x catalyst, and the major product of palmitic acid HDO is C 16 , demonstrating a high C atom economy. This facilitated catalytic performance may be ascribed to the synergic effect of metal Ni, Mo 2 CT x MXene as well as MoO 2 active sites. The palmitic acid (–COOH) can convert into hexadecanal (–CHO) and hexadecanol (–CH 2 OH) over Ni/MoO 2 @Mo 2 CT x catalyst in the initial stage. The metal Ni further contributes to the hydrogenation of the hexadecanal to C 15 with the cleavage of C–C bonds by decarbonylation (DCO) route. MoO 2 nanoparticles obtained from Mo 2 CT x oxidation accelerate the scission of C–O bonds of the hexadecanol to improve the selectivity of C 16 by hydrogenation-dehydration route.
研究领域:
化学工程
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可再生能源
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2022
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IF 9.965
Lei Hu,Liujun Jin,Tingyu Zhang,Jianhua Zhang,Jinghui He,Dongyun Chen,Najun Li,Qingfeng Xu,Jianmei Lu
The electronic modulation and morphology control of electrocatalysts are effective strategies to improve their catalytic performance. Herein, MoO 2 -MoO 3 /Ni 2 P nanoflowers were fabricated on the skeleton of conductive nickel foam as an electrocatalyst with enhanced performance via a universal hydrothermal and phosphating method. The introduction of P and Mo into the nickel-based catalyst through the co-doping strategy effectively adjusted the electronic structure of the Ni active sites, thereby significantly improving the performance of the catalyst. Particularly, the introduction of Mo allowed adjusting the morphology of the material, thereby increasing the electrochemical active area and promoting the exposure of more active sites. This strategy for improving the electrocatalyst’s performance in urea-assisted water splitting will provide a new concept for the simultaneous mitigation of the energy crisis and environmental contamination.
研究领域:
材料科学
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能源化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2022
·Vol. 10
·期 8
·4110-4119
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IF 14.511
Da Liu,Wenkai Fang,Jiangtao Li,Liling Zhang,Mei Yan,Hongwu Tang
In general, enrichment of a higher number of exoelectrogens implies higher power density. However, the low electrocatalytic activity of anodes limits the performance of microbial fuel cells. Here, based on this consideration, we designed and fabricated an anode by integrating the 3D hierarchical architecture and excellent electrocatalytic activity of MoO2/MoC@NC nanodendrites grown on carbon fiber cloth. The as-designed MoO2/MoC@NC-CC electrode exhibits a relatively large specific areal capacitance of 710.21 F m−2 and a charge transfer resistance of only 5.29 Ω, which are 46.9 times higher and 67.9 times lower than those of the bare carbon cloth (CC) anode respectively, providing abundant electroactive sites for the colonization of exoelectrogens and accelerating the rate of extracellular electron transfer. At the same time, there was a positive correlation between the enrichment amount of Geobacter and the power density, demonstrating the successful preparation of the desired electrode. In addition, the branched-lily-like architecture of the MoO2/MoC@NC-CC anode exhibits super hydrophilicity and open 3D structure, facilitating microbial attachment, colonization, proliferation and diffusion of the internal culture matrix, thus shortening the start-up time and improving the long-term stable current output. Consequently, the MoO2/MoC@NC-CC anode achieved the maximum power density of 2.93 W m−2, which is improved by 70.3% compared to that of the bare CC, and is also the best among the reported Mo-based nanomaterial modified electrodes. This work presents valuable insights for the design and fabrication of high performance anodes for MFCs.
研究领域:
能源材料
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环境工程
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电化学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
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2018
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IF 5.116
Lizhen Zeng,Xiaofen Chen,Hongying Li,Juan Xiong,Meihua Hu,Xin Li,Weishan Li
A novel composite, polydopamine-modified Mo 2 C/MoO 2 nanoparticles (HD-Mo 2 C/MoO 2 ), as anode electrocatalyst for microbial fuel cells (MFCs), is synthesized via carbon thermal reduction and following in situ polydopamine modification. The physical and electrochemical characterizations show that Mo 2 C/MoO 2 nanoparticles can be well dispersed through polydopamine modification and the resulting HD-Mo 2 C/MoO 2 exhibits excellent electrocatalytic activity compared with unmodified Mo 2 C/MoO 2 . The MFC using HD-Mo 2 C/MoO 2 as anode electrocatalyst achieves a maximum output power density of 1.64 ± 0.09 W m −2 , which is 39% higher than that using Mo 2 C/MoO 2 (1.18 ± 0.08 W m −2 ) as anode electrocatalyst. This excellent performance is attributed to modification of PDA, HD-Mo 2 C/MoO 2 shows better hydrophilicity and electrocatalytic activity toward the direct oxidation of bacterial metabolites than unmodified Mo 2 C/MoO 2 .
研究领域:
生物化学
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材料科学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）