SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Lufang Fan,Sheng Feng,Kai Wei,Xiaojun Dai,Weijie Zhang,Haihong Wang,Zhaowei Bian,Kaidi Wu,Zhiwen Ge,Jinghao Hua
In this study, we designed and fabricated a Z-scheme Cu 0.5 Cd 0.5 S/MoO 3-x (CMO) heterojunction with localized surface plasmon resonance (LSPR) effect for efficient photocatalytic hydrogen evolution. The oxygen vacancies (OVs) in MoO 3-x induced Schottky-barrier-free LSPR for the generation of hot electrons. The architecture of transition-metal-substituted solid solution (Cu 0.5 Cd 0.5 S, CCS) downshifted the conduction band (CB) of CdS from −0.45 eV to −0.38 eV and upshifted the valence band (VB) from 1.65 eV to 1.54 eV, respectively, weakening the interface barrier of the hot electrons transition from MoO 3-x to CCS and enhancing the Coulomb interaction between the electrons of MoO 3-x and the holes of CCS. Benefiting from the cooperation between Z-scheme heterojunction and LSPR effect, the hydrogen evolution rate (HER) of the optimized CMO was 19.28 mmol·g −1 ·h −1 under visible light with an apparent quantum yield (AQY) of 10.8 % at 420 nm, which was 3.0 and 1.4 times that of the CCS and CCS/MoO 3 . Moreover, the HER of CMO still reached 43.57 μmol·g −1 ·h −1 at 600 nm. This work paved a new path for efficient photocatalysts H 2 evolution by coupling Z-scheme heterojunction and non-noble-metal LSPR effect.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2025
·
IF 9.5
Rui Liu,Yunpei Cui,Teng Wang,Jiayou Liu,Bo Liu,Shuangshuang Zuo,Hesheng Yu
Plasmonic photocatalysts have attracted considerable attention in photocatalytic systems. In this study, amorphous molybdenum oxide (MoO3−x) nanodots were anchored onto ZnIn2S4 nanospheres by a hydrothermal method. The prepared ZnIn2S4/MoO3−x (ZM) composites were then used as a visible-light-responsive catalyst to achieve photocatalytic hydrogen evolution. Afterwards, the ZM composites were extensively characterized using multiple instruments and electrochemical measurements. Afterwards, the photocatalytic activity of ZM composites was evaluated under simulated sunlight (AM 1.5G) with 10% triethanolamine (TEOA) as a sacrificial reagent. Compared to pristine ZnIn2S4, the optimal composite (ZM10) boosts the hydrogen evolution rate from 1.34 mmol g−1 h−1 to 11.08 mmol g−1 h−1 and the apparent quantum efficiency (AQE) at 420 nm from 1.81% to 6.14%. The mechanism behind the enhanced photocatalytic hydrogen evolution was explored by infrared thermal image measurement, EPR tests, XPS valence band measurement and density functional theory (DFT) calculations. The localized surface plasmon resonance (LSPR) effect of MoO3−x and the formation of an interfacial Z-scheme heterojunction are revealed to be responsible for the improved photocatalytic hydrogen evolution. Finally, the cyclic experiment results show that ZM10 maintains a high hydrogen evolution rate after 5 cycles of testing, indicating strong chemical stability and good industrial potential.
研究领域:
材料科学
·
光催化
·
能源化学
✓ 已验证
DOI
高影响因子
JOURNAL OF CATALYSIS
·
2020
·
IF 7.888
Jie Zhang,Chuang Li,Weixiang Guan,Xiaozhen Chen,Xiao Chen,Chi-Wing Tsang,Changhai Liang
Co(Ni)/MoO 3 catalysts were prepared, characterized and evaluated for the hydrogenolysis of bio-derived dibenzofuran (DBF), aiming at the understanding of the promoting effect of Co/Ni on MoO 3 for high-yield production of aromatic products. All Co(Ni)/MoO 3 catalysts selectively cleaved C-O bond, thus effectively transformed DBF to biphenyl (BP) at relatively moderate conditions. The experimental results from varying Mo species by adjusting the reduction temperature of MoO 3 together with XPS and in-situ XRD characteristic were evident that Mo 5+ species was responsible as the major active specie for the reaction. Promotional effect between Co(Ni) and Mo in Co(Ni)/MoO 3 catalysts was observed, resulted from the presence of acidic Co(Ni)MoO 4 species and a large number of Mo 5+ species both of which were created local to the Co(Ni)-O-Mo interface, as can be characterized by in-situ XRD, XPS, H 2 -TPR, NH 3 -TPD, in-situ FT-IR, Raman and TEM. The trend of the initial reaction rate follows: MoO 3 (0.18 μmol∙g cat −1 ∙s −1 ) < Ni/MoO 3 (0.26 μmol∙g cat −1 ∙s −1 ) < Co/MoO 3 (0.29 μmol∙g cat −1 ∙s −1 ), corresponding to the decreasing activation barrier. And the best catalytic activity was observed for the 100% yield of BP over Co/MoO 3 . A possible mechanism, including Co(Ni) facilitated reduction of Mo 6+ to Mo 5+ and Co(Ni) enhanced formation of acidic sites, is proposed to be responsible for the high activity in Co(Ni)/MoO 3 catalysts.
研究领域:
催化化学
·
可再生能源
·
材料科学
✓ 已验证
DOI
高影响因子
GREEN CHEMISTRY
·
2024
·Vol. 26
·期 5
·2661-2672
·
IF 9.3
Songcheng Bo,Haoyi Lin,Jiaxing Zhang,Weiping Liao,Kaixuan Yang,Ting Su,Hongying Lü,Zhiguo Zhu
Oxidative desulfurization is an appealing alternative technology to eliminate organic sulfides in fuel oil in response to environmental and economic requirements. The supported metal oxide catalysts generally possess low catalytic activity and/or deactivation due to the loss and sintering of their metal oxides during the reaction or removal of carbon deposition at elevated temperature. In this work, beta zeolite-fixed MoO3 (MoO3@beta) was hydrothermally synthesized via structural reconstruction. A series of characterizations confirmed that MoO3 nanoparticles with an ultrasmall crystal size of 1.5–2.5 nm were fixed into the beta zeolite. Owing to the small particle size of MoO3, the MoO3@beta material exhibited nearly three times higher catalytic activity, weight-based space–time-yield, and active site-based turnover frequency than an impregnated MoO3/beta sample with MoO3 in an extra-framework position during the process of oxidative desulfurization with the oxidant H2O2. As for the oxidant molecular O2, MoO3@beta also possessed superior catalytic activity in a deep eutectic solvent under mild reaction conditions of 90 °C and ambient pressure, regardless of the model oil or actual fuel oil. Besides, excellent reusability was observed for the MoO3@beta catalyst via the elimination of carbon deposition through simple calcination, resulting from its unique feature to resist the loss and sintering of MoO3 fixed in the zeolite. More importantly, the catalytic mechanism of MoO3@beta was also revealed. This work opens a new avenue for effectively synthesizing zeolite-fixed metal oxide and establishing a green heterogeneous reaction system for catalytic oxidations.
研究领域:
催化
·
环境化学
·
材料科学
✓ 已验证
DOI
高影响因子
Environmental Science-Nano
·
2021
·Vol. 8
·期 7
·2049-2058
·
IF 8.131
Yuqi Zhang,Xiang Yu,Huan Liu,Xinyi Lian,Bin Shang,Yue Zhan,Tingting Fan,Zhou Chen,Xiaodong Yi
Transition metal oxides (TMOs) are emerging as a promising class of photocatalysts for pollutants' treatment. In this report, by integrating anti-solvent crystallization and thermal treatments, we have developed a facile and environmental approach for the synthesis of MoO3−x nanosheets in the presence of hexadecyl-trimethyl ammonium bromide (CTAB). The thickness of MoO3−x nanosheets varies from 20 nm to 40 nm. CTAB promotes the formation of nanosheet morphology and Mo5+ defects. Combining experimental results and density functional theory (DFT) calculations, we demonstrate that the Mo5+ defect state in MoO3−x nanosheets can enhance visible light harvest and promote the separation of photo-generated electron–hole pairs. Hence, MoO3−x-8, the optimal photocatalyst, shows the highest concentration of surface Mo5+ defect (18.7%) and the best photocatalytic activity toward rhodamine B (RhB) photodegradation. About 95.9% RhB is degraded within 15 min under visible-light irradiation (λ > 420 nm). The kinetic rate of MoO3−x-8 reaches 117 times that of commercial MoO3. It was proved by the total organic carbon (TOC) measurements that about 43.3% of RhB molecules were degraded to CO2 and H2O. Overall, this work provides an effective pathway for the nanomaterial design and potential applications in the photocatalytic oxidation of organic pollutants.
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2021
·Vol. 18
·期 10
·2107137
·
IF 13.281
Guangxin Duan,Ling Wen,Xingwei Sun,Zhuxin Wei,Ruixue Duan,Jiangfeng Zeng,Jiabin Cui,Chunyi Liu,Zepeng Yu,Xiaofang Xie,Mingyuan Gao
Diabetic ulcers (DUs) appearing as chronic wounds are difficult to heal due to the oxidative stress in the wound microenvironment and their high susceptibility to bacterial infection. A routine treatment combining surgical debridement with anti-infection therapy is widely used for treating DUs in the clinic, but hardly offers a satisfying wound healing outcome. It is known that a long-term antibiotic treatment may also lead to the drug resistance of pathogens. To address these challenges, new strategies combining both reactive oxygen species (ROS) scavenging and bacterial sterilization have been proposed for fighting against DUs. Following this idea, oxygen deficient molybdenum-based nanodots (MoO 3− X ) for healing the DUs are reported. The ROS scavenging ability of MoO 3− X nanodots is investigated and the antibacterial property of the nanodots is also demonstrated. The systematic cell and animal experimental results indicate that the MoO 3− X nanodots can effectively reduce inflammation, promote epithelial cell regeneration, accelerate angiogenesis, and facilitate DUs recovery. Most importantly, they present excellent capacity to diminish infection of methicillin-resistant Staphylococcus aureus , manifesting the potent application prospect of MoO 3− X nanodots for diabetic wound therapy.
研究领域:
纳米技术
·
材料科学
·
生物医学工程
·
药学
·
伤口护理
✓ 已验证
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2019
·
IF 4.084
Yuan Yao,Mingxuan Sun,Zihan Zhang,Xiaojing Lin,Bowen Gao,Sambandam Anandan,Wei Liu
A ternary composites of MoO 3 /Ag/TiO 2 nanotube arrays were synthesized by in-situ annealing of TiO 2 nanotube arrays impregnated with AgNO 3 over MoO 3 powders. During the annealing process , the crystallization of the TiO 2 nanotubes, the thermo-decomposition of AgNO 3 to Ag nanoparticles , and the sublimation of MoO 3 occur jointly. The photoelectrochemical measurements of the resultants indicate that MoO 3 /Ag/TiO 2 nanotube arrays present better photoelectrochemical properties compared with Ag/TiO 2 nanotube arrays and pristine TiO 2 nanotube arrays. Especially, the highest photocurrent and open circuit voltage are up to 21.29 μA/cm 2 and 0.058 V under visible light irradiation , whereas 1.77 and 3.87 times larger than those of TiO 2 nanotube arrays, respectively. Superior photoelectrochemical stability and larger photo-conversion efficiency of the ternary composites are also demonstrated. The improved photoelectrochemical properties are related to the close interfacial contact among MoO 3 , Ag, and TiO 2 as well as the surface plasma resonance of Ag in the ternary composites, which broaden the range of light response and enhance the efficiency of charge separation. This study provides a skillful solution to construct TiO 2 -based composite materials and demonstrates it is an unique architecture to promote the visible light driven photocatalytic application of TiO 2 .
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Interdisciplinary Materials
·
2024
·
IF 24.5
Bin Fan,Weikun Chen,Kaining Li,Qingya Wei,Qian He,Wei Liu,Bigui Zhou,Jun Yuan,Yingping Zou
The shuttle effect of lithium polysulfides (LiPSs) and their sluggish kinetic processes lead to rapid capacity fading and poor cycling stability in lithium–sulfur (Li–S) batteries, limiting their commercial viability. This study proposes a functionalized separator with adsorption and synergistic catalysis ability for Li–S batteries. The modified separator comprises Ti 3 C 2 T x sheets, CoO, and MoO 3 . Experimental and theoretical calculations demonstrate that Ti 3 C 2 T x /CoO/MoO 3 composite not only effectively inhibits the shuttle effect of LiPSs, ensuring efficient utilization of active materials, but also enhances reversibility and reaction kinetics among LiPSs. The full exposure of active sites in the Ti 3 C 2 T x /CoO/MoO 3 composite and the synergistic action of different catalysts enable efficient capture and conversion of LiPSs molecules at the material surface. Besides, the lithium–sulfur batteries with Ti 3 C 2 T x /CoO/MoO 3 @PP separator exhibited only a 0.042% capacity decay per cycle at 0.5 C (800 cycles). Moreover, a high areal capacity of 6.85 mAh cm −2 was achieved at high sulfur loading (7.9 mg cm −2 ) and low electrolyte-to-sulfur ratio (10 μL mg −1 ).
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Sustainable Energy & Fuels
·
2023
·Vol. 8
·期 3
·604-609
·
IF 5.6
Jinhui Zhang,Chuanhe Ma,Haixuan Gao,Jinchun Jiang,Hailong Wang
An over-thick MoSe2 layer and numerous voids at the absorbing layer inside and backside lead to a relatively low Jsc and PCE of CZTSSe solar cells. In previous studies, MoO2 and MoO3 sacrificial layers have been commonly used to eliminate those voids and reduce the thickness of MoSe2 layers. However, there is still no clarity about which one is more effective. In this work, we prepared MoO2 and MoO3 sacrificial layers on the surface of Mo-coated SLG substrates by air annealing and ammonia (NH3·H2O) etching, respectively. J–V testing shows that both MoO2 and MoO3 can effectively improve the Jsc and PCE of CZTSSe solar cells, wherein MoO3 is more effective. Comparative analysis shows that the electrical mechanism of Jsc and PCE improvement lies in the significant reduction of device series resistance (Rs). SEM images and XRD pattern results indicate that the reason for Rs decreasing is void elimination and MoSe2 layer thickness reduction from 600 nm to 270 nm after applying MoO3. With the aid of the MoO3 sacrificial layer, the PCE of the CZTSSe device increases from 7.51% to 9.58% (total area 0.21 cm2) without the MgF2 anti-reflection layer.
研究领域:
材料科学
·
太阳能
·
光伏技术
✓ 已验证
产品关联
DOI
高影响因子
Nano-Micro Letters
·
2020
·Vol. 12
·期 1
·1-14
·
IF 12.264
Wang Yuanming,Wang Xue,Li Xiaolong,Liu Rong,Bai Yang,Xiao Huanhao,Liu Yang,Yuan Guohui
All-pseudocapacitive and highly deformable MXene hybrid film is successfully fabricated by a facile and efficient vacuum-assisted filtration of ultrathin MoO 3 nanobelts and delaminated MXene nanosheets.
The optimal M/MoO 3 hybrid electrode delivers an ultrahigh volumetric capacitance of 1817 F cm −3 (545 F g −1 ), which exceeds large majority of previously reported MXene-based flexible electrodes.
The symmetric supercapacitor presents excellent energy density of 44.6 Wh L −1 (13.4 Wh kg −1 ), indicating the electrode promising in achieving high-energy-density devices.
研究领域:
材料科学
·
纳米科技
·
电化学
·
能源存储
·
功能材料
✓ 已验证
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2021
·
IF 7.963
Zhengqing Cai,Yougui Song,Xibiao Jin,Chong-Chen Wang,Haodong Ji,Wen Liu,Xianbo Sun
A highly solar active AgBr/h-MoO 3 composite was constructed by a facile precipitation method, and the charge separation tuning was achieved by photoreduction of AgBr. The photoreduced Ag 0 on AgBr/h-MoO 3 acted as charge transfer bridge to form Z-scheme heterostructure, while the high degree of Ag reduction converted the material into type-II heterostructure. The synthesized optimal material promoted charge separation and visible light activity due to the incorporation of highly solar active AgBr, which showed ca. 2 times activity on trimethoprim (TMP) degradation than h-MoO 3 . The contribution of reactive species on TMP degradation followed the order of O 2 − > 1 O 2 > h + , which agree well with the proposed charge separation mechanism. The photocatalytic degradation mechanism of TMP was proposed based on the radical quenching, intermediate analysis and DFT calculation. The toxicity analysis based on QSAR calculation showed that part of the degradation intermediates are more toxic than TMP, thus sufficient mineralization are required to eliminate the potential risks of treated water. Moreover, the material showed high stability and activity after four reusing cycles, and it is applicable to treat contaminants in various water matrix. This work is expected to provide new insight into the charge separation tuning mechanism for the AgX based heterojunction , and rational design of highly efficient photocatalysts for organic contaminants degradation by solar irradiation.
研究领域:
环境科学
·
材料科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2017
·
IF 9.446
Bing Feng,Zhengying Wu,Jinsong Liu,Kongjun Zhu,Ziquan Li,Xin Jin,Yindi Hou,Qingyang Xi,Mengqi Cong,Pengcheng Liu,Qilin Gu
Inspired by the natural photosynthesis in green plants, artificial heterogeneous Z-scheme photocatalytic systems are widely used to settle environmental concerns and energy crises, and their excellent characteristics come from long-term stability, wide absorption range, high charge-separation efficiency, and strong redox ability. However, the contribution of the surface-adsorbed dyes antenna molecule is seldom considered in the process of Z-scheme photocatalysis. In this study, we construct AgBr quantum dots decorated MoO 3 nanobelts as a novel Z-scheme photocatalyst by an oriented diffusing and charge induced deposition. For the first time, we find the synergistic effect caused by the suitable energy band match among RhB dyes, AgBr nanoparticles, and MoO 3 nanobelts, leading to the ultrafast dye-sensitized-assisted electron transfer process. This is responsible for excellent photocatalytic activities of the achieved AgBr/MoO 3 monolithic catalyst for degrading RhB under visible light irradiation. Simultaneously, changing of the band gaps and detailed mechanism for high efficiency degradation is analyzed and explored by theoretical calculations and designing further experiments. It is proposed that ultrafast degradation of the RhB on the AgBr/MoO 3 nanocomposites is due to both the photocatalytic process and the dye sensitization; the superoxide radical O 2 − , which is produced by accumulated dye-sensitization-induced abundant electrons with powerful potential in the CB of AgBr accompanying by quick combination of electrons in the CB of MoO 3 with photogenerated holes in the VB of AgBr, is a dominant reactive species for the degradation of RhB under visible light irradiation.
研究领域:
环境科学
·
材料科学
·
光化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）