BIORESOURCE TECHNOLOGY
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2019
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IF 6.669
Lele Jin,Wenzhi Li,Qiying Liu,Longlong Ma,Chao Hu,Ajibola T. Ogunbiyi,Mingwei Wu,Qi Zhang
In this study, the Mo-promoted Ir/SiO 2 (Ir-MoO x /SiO 2 ) catalysts combined with the zeolite HZSM-5 were used for the direct conversion of microcrystalline cellulose (MCC) to liquid fuel (C 5 /C 6 alkanes) in n-dodecane/H 2 O system. A synergistic effect was formed between the partially reduced MoO x species and the Ir particles, which effectively promoted the catalytic activity of Ir/SiO 2 catalyst. When the Mo/Ir molar ratio was 0.5, a high yield of C 5 /C 6 alkanes (91.7%) was achieved at 210 ℃ for 12 h. In addition, the main component of C 5 /C 6 alkanes was n-hexane, which was proven to be obtained by the hydrogenolysis of the key intermediate, sorbitol, formed from the hydrolysis and hydrogenation of MCC.
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PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Meixuan Li,Huiyuan Wang,Yun Zhu,Di Tian,Ce Wang,Xiaofeng Lu
It is extremely necessary to develop high-performance noble-metal-free hydrogen evolution reaction (HER) electrocatalysts applied over the whole pH values to replace expensive Pt-based catalysts. Herein, a typical metal-semiconductor heterostructure with metallic Mo and Mo 2 C nanoparticles encapsulated in nitrogen-doped carbon nanofibers (N-CNFs) is fabricated via the pyrolysis of electrospun polyacrylonitrile (PAN)/cellulose acetate (CA)/bis(acetylacetonato)dioxomolybdenum (MoO 2 (acac) 2 ) nanofibers . The unique porous and channel-rich structure of Mo/Mo 2 C/N-CNFs can be manipulated by varying the mass ratio of polyacrylonitrile and cellulose acetate , leading to the exposure of abundant active centers and the acceleration of rapid mass transport. In addition, the synergetic effect among metal and semiconductor as well as the excellent conductivity of the N-CNFs result in excellent HER activity and stability over a wide pH range. To achieve the current density of 10 mA cm − 2 , the optimized Mo/Mo 2 C/N-CNFs exhibit overpotentials of 175, 162 and 294 mV in 0.5 M H 2 SO 4 , 1 M KOH and 0.1 M phosphate buffer solution (PBS), respectively. This work provides a feasible approach to synthesize high-performance and economical hydrogen evolution electrocatalysts at all pH values for renewable energy-related applications.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2019
·
IF 4.175
Worku Lakew Kebede,Dong-Hau Kuo,Misganaw Alemu Zeleke,Kedir Ebrahim Ahmed
Environmentally toxic methylene blue organic pollutants are of more concerns due to their antagonistic effects on human health, animals, and plants, thus needs serious attention for their removal. For elimination purpose, the Sb-doped Mo(O,S) 3 oxy-sulfide nanoplate catalyst with different Sb contents was synthesized at low temperature of 95 °C via a facile method. The structural, morphological, chemical composition, optical properties , and electrical conductivity of the catalyst were characterized with different techniques. The photocatalytic performance of Sb-Mo(O,S) 3 at various Sb contents was investigated for the degradation of methylene blue dye under visible light irradiation using hydrogen peroxide as an effective electron scavenger to further accelerate the reaction. It was observed that the incorporation of Sb enhanced the catalytic activity. Sb-Mo(O,S) 3 -10 was the most efficient catalyst with excellent activity to degrade 99.7% of the dye within 60 min irradiation time. The degradation kinetics follows a pseudo-first-order reaction with a rate constant 8.78 × 10 −2 min −1 , which is 3-fold higher than that for Sb- Mo(O,S) 3 -0 catalyst. Sb-Mo(O,S) 3 -10 showed slower recombination of photogenerated charge carriers and lower charge transfer resistance which proved to be capable for the removal of toxic methylene blue organic pollutant.
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COLLOIDS AND SURFACES B-BIOINTERFACES
·
2024
·
IF 5.4
Bianyun Cai,Mintao Xue,Delin Yuan,Xueke Zhou,Yizhou Huang,Zhijun Guo
Bacterial infection and inadequate osseointegration represent significant challenges in the application of titanium (Ti)-based bone implants. Surface modification presents a promising strategy to address these obstacles. Taking advantage of silver ions, black phosphorus nanosheets (BPNs) and polydopamine (PDA), this study developed a versatile platform on the surface of Ti-12Mo-10Zr (TMZ) alloy through a multiple surface modification process, including the anodic oxidation treatment of TMZ alloy, the preparation and addition of silver-loaded BPNs (BPNs/Ag), and the coating with PDA. Our results demonstrated that silver enhanced the stability of BPNs/Ag, which were successfully loaded to the nanostructure of oxidized TMZ surface. PDA coating conferred a pH-responsive property to the surface, prolonged the release of silver ions, and improved the photothermal performance. In acidic conditions that mimic bone defect microenvironment, the platform exhibited good photothermal performance, accelerated Ag + release, enhanced antibacterial efficacy, and increased osteoinductivity. Taken together, due to its advantageous characteristics, the versatile platform provides a valuable solution to improve the surface performance of TMZ alloys.
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高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Yan Zheng,Jinshu Lu,Xuan Wang,Tianbo Jia,Jinyi Cai,Dingkai Zhou,Yuexin Qian,Yamin Fu,Chunyang Zhai,Hengcong Tao,Yingtang Zhou,Shunli Li
Seawater splitting to produce hydrogen holds promise for renewable energy but faces challenges from chloride ions, causing electrode corrosion and competition between chlorine oxidation reaction (ClOR) and oxygen evolution reaction (OER). Therefore, it is crucial to develop highly efficient and stable electrocatalysts for seawater splitting. Here, we employ a dual-doping strategy of Mo/Cr cations and a sulfuration approach to fabricate the S-MoCr-NiFe@NF bifunctional catalyst with a 3D nano-flower structure. The S-MoCr-NiFe@NF catalyst exhibits remarkable catalytic performance for the oxygen evolution reaction (OER) in 1.0 M KOH + 0.5 M NaCl and 1.0 M KOH + Seawater, achieving current densities of 10 mA cm −2 at low overpotentials of 116 and 141 mV, respectively. Furthermore, it was demonstrated that the S-MoCr-NiFe@NF catalyst exhibited remarkable performance in alkaline overall seawater splitting, requiring only 1.48 and 1.57 V to achieve current densities of 10 mA cm −2 in 1.0 M KOH + 0.5 M NaCl and 1.0 M KOH + Seawater, respectively. The in-situ Raman and DFT calculations confirm Ni as the primary active sites, reducing the energy barrier of the rate-determining step and enhancing OER performance. This study will offer a viable approach to developing and creating highly effective bifunctional catalysts for seawater splitting.
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Catalysis Science & Technology
·
2025
·
IF 4.2
Dajian Li,Alfin Kurniawan,Tania Roy,Jin Wang,Cheng lan Liu,Ze Zhen Wang,Rong Zhen Mu,Chun Hui Zhou
The efficient production of allyl alcohol from glycerol is of great importance due to its significance as a valuable intermediate in chemical industries. While catalytic conversion of glycerol to allyl alcohol by solid acid catalysts, carbon deposition (coking) is prone to occur on the catalyst surface, leading to slow down the conversion process and fast deactivation of the catalyst. In this study, we obtained an efficient catalyst for the preparation of allyl alcohol from gas-phase glycerol by controlling the pore structure and surface acidity of the catalyst. The characterization results showed that hydrochloric acid and citric acid removed the silicon and aluminium elements from montmorillonite, and the acidity, pore volume, and surface area ratio of Na-MMT (SBET=34.5 m2 g-1, VT=0.19 cm3 g-1) of the porous montmorillonite(HA1MMT) catalyst were all improved (SBET=97.9 m2 g-1, VT=0.28 cm3 g-1); After adding MoOx and VOx, the selectivity of Mo/V-HA1MMT catalyst for allyl alcohol was improved. The XPS characterization results indicate that the synergistic effect of Mo and V can promote the transfer of electrons during the reaction process of glycerol conversion. Within 480 minutes of catalyzing glycerol dehydration reaction, Mo0.6V0.4(5)-HA1MMT was almost deactivated (Conv.= 19.5%, Sel.allyl alcohol=31.2%) due to carbon deposition. When the catalyst was doped with calcium and magnesium components, a new active phase CaMo4 was discovered on the catalyst, and the acidity of Ca0.5Mg0.5-Cat. (Cat. is Mo0.6V0.4(5)-HA1MMT) decreased to 214.0 μmol g-1. The coking resistance performance of Ca0.5Mg0.5-Cat. was improved, and after 660 minutes of reaction, the catalyst was deactivated (Conv.= 32.1%, Sel.allyl alcohol=30.1%) due to carbon deposition. During the 3rd catalyst regeneration test, Ca0.5Mg0.5-Cat. still maintained high activity (Conv.= 63.3%, Sel.allyl alcohol=35.2%, Sel.acrolein=31.2%). The results of this study indicate that suitable pore structure and acidity are crucial for designing a catalyst with coking resistance properties.
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Tungsten
·
2025
·
IF 11.2
Shi Xue-Chao,Wang Yi-Mei,Hou Shu-Xian,Yang Guo-Qiang,Liu Xin-Xin,Ge Jun,Gui Lin,Zhang Wei-Wei,Kaoutar Chaldi,Li Shu-Jie,Wang Jun,Ge Fei
Waterborne microbial contamination represents a significant global environmental challenge. Microorganisms can induce water pollution, precipitating infectious disease outbreaks and posing a substantial threat to human health. Currently, the excessive use of conventional antibiotics has resulted in the emergence of bacterial resistance, posing a challenge to the design and development of antimicrobial agents with high antibacterial efficacy in diverse water such as rivers, lakes, and wastewater from microbiology laboratories. Bimetallic nanomaterials, that amalgamate the distinctive characteristics of diverse metals, are garnering attention due to their synergistic properties. In this study, PVP-FeMo 2 S 3 (PVP: Polyvinylpyrrolidone) and PVP-ZnMo 2 S 3 nanocrystals were synthesized by a high-temperature reaction. The prepared nanocrystals exhibited excellent biocompatibility, regular morphology, long-term stability, and remarkable antibacterial effects. The bacterial biofilms could be eradicated by the combination of photothermal (PTT) and photodynamic synergistic effects of PVP-FeMo 2 S 3 and PVP-ZnMo 2 S 3 nanocrystals. PVP-ZnMo 2 S 3 nanocrystals exhibited enhanced PTT conversion efficiency for water treatment. Remarkably, even after 20 cycles of recycling, PVP-ZnMo 2 S 3 retained substantial antibacterial efficacy. The excellent biosafety of PVP-ZnMo 2 S 3 further guarantees the safety of water quality post-treatment. Thus, PVP-ZnMo 2 S 3 bimetallic nanocrystals can serve as a novel antimicrobial agent for the treatment of microbial contamination in water. This study offers a potential strategy to mitigate secondary water pollution and prevent the development of drug resistance among pathogenic microorganisms.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2025
·
IF 8.3
Yutong Chen,Rong Wu,Jianyong Yue,Dezheng Kong,Chen Zhang,Shunhang Wei
Photocatalytic overall water splitting (POWS) is an efficient technology that converts solar energy into H 2 energy, holding significant importance in the realms of energy and the environment. As a visible-light photocatalyst, ZnIn 2 S 4 , despite being an ideal low-dimensional semiconductor for photocatalytic overall water splitting, has its performance therein affected by poor charge separation. The present study reports the successful synthesis of a novel Bi 4 NbO 8 Cl/ZnIn 2 S 4 :Mo Z-scheme heterojunction via a hydrothermal method. Under AM 1.5G irradiation, the POWS H 2 evolution rate was measured at 84.8 μmol g −1 h −1 , while the O 2 evolution rate was determined to be 47.0 μmol g −1 h −1 . Under simulated solar light irradiation, Bi 4 NbO 8 Cl/ZnIn 2 S 4 :Mo heterojunction exhibits an apparent quantum efficiency (AQE) of 0.22 % at 420 ± 20 nm and a solar-to-hydrogen (STH) conversion efficiency of 0.026 %. UV–Vis–NIR spectroscopic analysis unequivocally demonstrated a significant enhancement in the utilization efficiency of the Bi 4 NbO 8 Cl/ZnIn 2 S 4 :Mo Z-scheme heterojunction in the near-infrared light region compared to the pristine ZnIn 2 S 4 and Bi 4 NbO 8 Cl. This improvement extends the spectral absorption boundary of the photocatalyst, allowing efficient capture of a considerable proportion of low-energy photons in sunlight. Unique charge transfer mechanism of Z-scheme heterojunction was revealed by in-situ XPS and EPR tests. Z-scheme heterojunction effectively promoted the respective enrichment of electrons and holes generated by photo-excitation in ZnIn 2 S 4 :Mo and Bi 4 NbO 8 Cl, thereby improving the performance of POWS. This study not only establishes an experimental foundation for the design and construction of Z-scheme heterojunctions but also explores a new approach to augment the utilization efficiency of the near-infrared solar spectrum.
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Catalysis Science & Technology
·
2025
·
IF 4.2
Yu-Le Wang,Songhai Wu,Yu-Zhen Xu,Yu-Dong Shan,Yong Liu,Xu Han
The selective oxidation of cyclohexene (Cy) to cyclohexene oxide (Cy-ep) using O2 remains challenging due to low epoxidation selectivity. In this work, a series of Mo-doped TS-1 (Mo-TS-1) catalysts were successfully synthesized for the epoxidation of Cy under solvent- and initiator-free conditions with O2 as the oxidant. Among them, 5Mo-TS-1 exhibited high catalytic performance, achieving 43.5% Cy conversion and 50.6% selectivity toward Cy-ep. Additionally, valuable byproducts such as 2-cyclohexen-1-ol (Cy-ol) and 2-cyclohexen-1-one (Cy-one) were obtained with yields of 28.0% and 21.4%, respectively. Since both Cy-ol and Cy-one are valuable intermediates in fragrance synthesis, over 43.5% of Cy was effectively converted into high-value products. Quenching experiments and Raman spectroscopy revealed that surface oxygen vacancies (Ov) facilitate the activation of O2 to form ≡Ov‑superoxo species, which abstract hydrogen from the allylic C-H bond of Cy to generate 3-cyclohexenyl radicals (Cy•). These radicals subsequently react with O2 to form Cy-OO•, followed by hydrogen abstraction from another Cy molecule to yield 2-cyclohexene-1-hydroperoxide (Cy-OOH). A positive correlation between Cy-OOH and Cy-ep formation underscores the critical role of Cy-OOH in the epoxidation process. Furthermore, Raman spectroscopy confirmed the presence of ≡Mo-(η2-O2) peroxo species on the catalyst surface, which preferentially attack the C=C bond of Cy to form Cy-ep. DFT calculations elucidated two distinct O2 activation pathways: In Pathway I, O2 is activated at Ov sites to form ≡Ov‑superoxo, which subsequently reacts with Cy to generate ≡Ov‑peroxo, Cy-OOH, and Cy•. In Pathway II, Mo(V/VI) sites either directly activate O2 or react with peroxo intermediates (≡Ov‑peroxo or Cy-OOH) to form ≡Mo-(η2-O2). This species selectively epoxidizes the alkene bond in Cy to Cy-ep. Notably, the direct activation of O2 at Mo(V/VI) sites bypasses the allylic oxidation route, thereby enhancing the epoxidation selectivity beyond the theoretical limit of 50.0%. This study provides new insight on the importance of surface superoxo and peroxo mediated by Ov and Mo(V/VI) in the epoxidation processes.
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ACS Applied Energy Materials
·
2024
·
IF 5.4
Dayakar Gandla,Yun’an Zhou,Yihao Yan,Yifan Niu,Fuming Zhang,Daniel Q. Tan
MXenes, a class of two-dimensional transition metal carbides and nitrides, hold great promise for electrochemical energy storage applications due to their exceptional electronic conductivity, tunable surface chemistry, and pseudocapacitive charge storage mechanisms. This study introduces a one-step approach to deposit Mo and Ti-dual oxide nanoparticles in situ onto Mo2Ti2C3Tx MXene using the Lewis acid molten salt method (LAMS), meticulously optimizing annealing conditions. The incorporation of Mo and Ti dual oxide nanoparticles improves the pristine Mo2Ti2C3Tx MXene by preventing collapse of the layered structure and restacking of MXene sheets. Both three-electrode and coin cell devices are assessed in an aqueous electrolyte, illustrating the favorable role of the nanoparticles acting as spacers. Remarkable outcomes include a specific capacity of 434 C g–1 at 5 mA cm–2, exceptional capacity retention of 94% after 5000 charge–discharge cycles at 50 mA cm–2, and a high gravimetric energy density of 52.5 W h kg–1 at a power density of 1442 W kg–1 in an aqueous 3 M KOH electrolyte. This research underscores the potential of double transition metal MXenes as energy storage electrodes and an eco-friendly mass synthesis route, contributing to sustainable advancements in energy storage technology.
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高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2023
·Vol. 170
·期 9
·092505
·
IF 3.9
Shuna Liu,Ben Yang,Anran Zuo,Yongming Tang
Ti/SnO2-Sb/PbO2 anodes were electrodeposited from methanesulfonate-based baths, and the effect of dopants such as PVP and Fe on the surface morphology, phase composition, electrocatalytic activity and stability was investigated. It is revealed that the inclusion of Fe effectively enhances the stability of PbO2 anode, while PVP can significantly improve its electrocatalytic activity. The Fe,PVP-codoped anode, Ti/SnO2-Sb/Fe-PVP-PbO2, exhibits the higher stability and electrocatalytic activity compared to the respective inclusion of Fe and PVP. The gradation efficiency of methyl orange (MO) on the Ti/SnO2-Sb/Fe-PVP-PbO2 anode is affected by the applied current density and the initial MO concentration. During degradation, the azo structure of MO is firstly cleaved, resulting in the rapid decolorization of solution. Demethylated MO and the anion of sulfanilic acid are detected as intermediates, and thus a plausible pathway of MO degradation is proposed.
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Sustainable Energy & Fuels
·
2019
·Vol. 4
·期 4
·1654-1664
·
IF 4.912
Caiyun Wu,Yunmei Du,Yunlei Fu,Di Feng,Hui Li,Zhenyu Xiao,Yanru Liu,Yu Yang,Lei Wang
In this study, a composite of Mo, Co co-doped NiS bulks grown on an Ni foam (Mo,Co-NiS/NF) was synthesized as a bi-functional electrocatalyst for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) using a simple method. The existence of ZIF-67 and Mo ensure the even distribution of Co and Mo elements and the formation of N doped carbon layer in Mo, Co-NiS/NF. Mo, Co co-doping and NF support greatly improved the electrocatalytic performance of NiS bulks, because metal element doping could improve the intrinsic activity and electrical conductivity. Moreover, the Ni foam could act as a substrate to avoid aggregation and provide nickel source to form the bimetallic sulfide. The product Mo,Co-NiS/NF-400 showed outstanding electrochemical properties, with ultralow overpotential (92 mV vs. RHE) for HER and ultralow overpotential (117.2 mV vs. RHE) for OER to achieve 10 mA cm−2, as well as the ultralow cell voltage (1.36 V) to achieve 20 mA cm−2 for overall water splitting. This study provides an available method to promote the electrocatalytic activity of the traditional monometallic sulfides for overall water splitting.
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