BIOMASS & BIOENERGY
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2022
·
IF 5.774
Wenlu Zhang,Chunrong Wang,Beining Luo,Peihang He,Lei Zhang,Guoqiang Wu
With the aim of developing efficient heterogeneous catalysts for production of clean biodiesel through the transesterification process, a novel Mo catalyst supported on the outer surface of ZSM-22 ( x Mo/ZSM-22) was developed and synthesized successfully with the wet impregnation method. The characterization results showed that the Mo(VI) oxide species were highly dispersed on the surface of catalysts under the Mo-loading not higher than 5%, and the aggregation of the MoO 3 nanoparticles were detected above the Mo-loading of 5%. Meanwhile, the maximum acid intensity was also exhibited in the 5Mo/ZSM-22 catalyst. As a result, the catalytic performance of Mo/ZSM-22 catalysts in the transesterification of waste cooking soybean oil (WCSO) was significantly improved compared with the untreated ZSM-22 catalyst. Especially, the 5Mo/ZSM-22 showed the good activity (X WCSO of 59.29%, S Biodiesel of 99.86%), which was mainly due to the well dispersed Mo species and the larger acidity. Additionally, the 5Mo/ZSM-22 catalyst exhibits good stability and the high biodiesel selectivity , and the fuel properties of the as-synthesized biodiesel meet ASTM D6751 standards. This work provides a useful synthesis strategy of transesterification catalysts for the preparation of biodiesel.
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INORGANIC CHEMISTRY
·
2023
·
IF 4.6
Yuan Guan,Xinyi Gu,Qiankun Deng,Shaomang Wang,Zhongyu Li,Shicheng Yan,Zhigang Zou
Bismuth vanadate is a promising material for photoelectrochemical water oxidation. However, it suffers from a low quantum efficiency, poor stability, and slow water oxidation kinetics. Here, we developed a novel photoanode of CoS/Mo-BiVO4 with excellent photoelectrochemical water oxidation performance. It achieved a photocurrent density of 4.5 mA cm–2 at 1.23 V versus the reversible hydrogen electrode, ∼4 times that of BiVO4. The CoS/Mo-BiVO4 photoanode also exhibited good stability, and the photocurrent density generated by the CoS/Mo-BiVO4 photoanode did not significantly decrease after light irradiation for 2 h. Upon replacement of part of the V with Mo doping in BiVO4, the local electric field around the Mo–O bond was enhanced, thus promoting carrier separation in BiVO4. The CoS was deposited on the surface of Mo-BiVO4, forming a built-in electric field at the interface. Under the action of the bias electric field and the built-in electric field, the carriers of CoS/Mo-BiVO4 were efficiently separated in the direction of the inverse type II heterojunction. In addition, CoS improved the light absorption and charge injection efficiency of the CoS/Mo-BiVO4 photoanode.
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Crystals
·
2023
·Vol. 14
·期 1
·14
·
IF 2.7
Yufei Zu,Zi Wang,Hongliang Tian,Fan Wu,Lianshen Fu,Jixiang Dai,Jianjun Sha
High-entropy diboride-based (MeB2-based) ceramics are promising high-temperature structural materials because of their excellent mechanical properties, high-temperature stability, and oxidation resistance. In order to achieve low-temperature sintering of the high-entropy ceramics, a novel preparation method of high-entropy (Ti,Zr,Nb,Mo,W)B2-SiC ceramics based on reactive sintering of pre-alloyed solid-solution metals and nonmetals of Si, C, B4C was conducted in the current work. Mechanical alloying behavior of the mixed metal powders, as well as the phase composition, microstructure, mechanical properties, and oxidation behavior of the as-sintered MeB2-SiC ceramic were investigated. The XRD, SEM, and EPMA results indicated that the primary MeB2solid-solution and SiC phases could be successfully formed during reactive sintering at a relatively low temperature of 1650 °C. The as-sintered MeB2-SiC ceramics had a high relative density of 97.8% and high mechanical properties (hardness of 19.74 ± 0.8 GPa, flexure strength of 533 ± 38 MPa, and fracture toughness of 6.01 ± 0.77 MPa·m1/2). Combining the oxidation behavior and microstructure evolution of the oxidation layer, a continuous and relatively dense MeOx-SiO2oxidation layer was gradually formed and covered on the external surface, leading to decelerating oxidation behavior after an oxidation exposure time of 10 min.
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DEVELOPMENTAL AND COMPARATIVE IMMUNOLOGY
·
2023
·
IF 2.9
Yi-Xin Wu,Shuai-Yue Hu,Xin-Jiang Lu,Jian-Rao Hu
Piscidins participate in the innate immune response of fish, which aims to eliminate recognized foreign microbes and restore the homeostasis of immune system. We characterized two piscidin-like antimicrobial peptides (LjPL-3 and LjPL-2) isolated from Japanese sea bass ( Lateolabrax japonicus ). LjPL-3 and LjPL-2 showed different expression patterns in tissues. After Vibrio harveyi infection, the mRNA expression of LjPL-3 and LjPL-2 was upregulated in the liver, spleen, head kidney, and trunk kidney. The synthetic mature peptides LjPL-3 and LjPL-2 exhibited different antimicrobial spectra. Furthermore, LjPL-3 and LjPL-2 treatments decreased inflammatory cytokine production while promoting chemotaxis and phagocytosis in monocytes/macrophages (MO/MФ). LjPL-2, but not LjPL-3, displayed bacterial killing capability in MO/MФ. LjPL-3 and LjPL-2 administration increased Japanese sea bass survival after V. harveyi challenge, which was accompanied by a decline in bacterial burden . These data suggested that LjPL-3 and LjPL-2 participate in immune response through direct bacterial killing and MO/MФ activation.
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APPLIED CATALYSIS A-GENERAL
·
2023
·
IF 5.5
Yiming Hu,Wenchang Li,Lin Li,Jinhong Wu,Shizhan Sheng,Huihua Wang
Developing impressive and low-cost electrocatalysts for hydrogen evolution reaction (HER) is the key for large-scale application of hydrogen production . Herein, a series of non-noble Ni-Mo-P coatings were achieved in the ChCl-EG electrolyte through a facile electrodeposition method under different experimental conditions. The 0.6Ni-0.21Mo-0.066 P coating fabricated at 30 mAcm −2 exhibits an impressive HER catalytic activity for delivering a current density of 10 mAcm −2 at only an overpotential of 57 mV in 1 M KOH electrolyte, ascribing to the synergistic effect of Ni, Mo and P elements and regulated electron structures, as well as large electrochemical active areas produced in the ChCl-EG electrolyte. Moreover, the 0.6Ni-0.21Mo-0.066 P coating demonstrates a pronounced electrocatalytic stability toward HER in the long-term test due to its obviously small inners tress. The outstanding HER performance of 0.6Ni-0.21Mo-0.066 P coating, along with facile and scalable fabrication method, highlights the potential application in the field of electrocatalytic water splitting.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Yuhao Chen,Kaihang Yue,Jia-Wei Zhao,Zhengyang Cai,Xianying Wang,Ya Yan
Constructing low-cost, high-active and robust heterogeneous hydrogen evolution reaction (HER) electrocatalysts with strong metal–metal oxide-support interaction (SMMOSI) is still an urgent challenge for the development of anion exchange membrane water electrolysis (AEMWE), especially under high current density (e.g., 1 A cm −2 ). Herein, a hierarchical composite of heterogenous Ni 4 Mo/NiMoO 4 (NiMoO x ) nanoparticles (NPs) anchored on a mesoporous carbon CMK-3 (NiMoO x @CMK-3) is designed as a superior electrocatalyst for HER. Significantly, the strong interaction between heterogeneous NiMoO x NPs and CMK-3 supporting matrix effectively stabilize the catalytic active Ni 4 Mo/NiMoO 4 heterostructure by altering the local geometric and electronic structures, leading to maximumly exposure of active sites and promoted electron transfer ability. The optimized electrocatalyst exhibits outstanding HER activity with an extremely low overpotential and Tafel slope of 7 mV@10 mA cm −2 and 27.7 mV dec -1 , respectively, and can steadily operate at 100 mA cm −2 for 800 h. More significantly, owing to these HER merits, the AEMWE configuration with NiMoO x @CMK-3 (−) is also designed, resulting in low cell voltage of 1.965 V@1 A cm −2 and negligible degradation over 400 h@1 A cm −2 . Further ex/in-situ electrochemical spectra evidence that both the partial combined MoO 4 2- from NiMoO 4 and the newly formed MoO 4 2- originating from dissolved Mo in NiMoO x @CMK-3 could boost the fast generation of polymerized Mo 2 O 7 2- that could effectively accelerate the HER process in alkaline conditions by facilitating the formation of active Mo-H* intermediates. Moreover, theoretical calculation results demonstrate the upshifting of d-band center of Mo toward Fermi level for the heterogeneous NiMoO x and the strong charge distribution between the heterointerface could optimize adsorption free energies of H* (ΔG H* ) on the surface of Mo atoms.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Xinkuai He,Zhousi Hu,Ruqing Guo,Yiren Li,Luye Wu
One of the most critical challenges in the field of hydrogen production through water electrolysis technique is the design, development and manufacture of electrode materials with low-cost, highly electrocatalytic activity and stability. We employ the galvanostatic deposition technique to prepare the honeycomb structured Co−Ni−Mo alloy electrocatalysts from ethylene glycol (EG) system, in which the honeycomb structure presents highly intrinsic electrocatalytic activity for hydrogen evolution reaction (HER). The electrochemical behavior of Co 2+ , Ni 2+ and Mo 6+ reductions and the co-deposition behavior of Co-Ni, Co-Mo, Ni-Mo and Co-Ni-Mo alloys is reported. Benefiting from the composition engineering by alloying with Mo atoms, as well as the simultaneous existence of a suitable honeycomb structure, these Co 58 Ni 23 Mo 19 deposits obtained at an optimal parameter exhibit prominent electrocatalytic durability and activity with a η 10 of 51 mV for HER in a 1.0 M KOH. More importantly, the formation model of the honeycomb structured Co-Ni-Mo alloy deposits is proposed. This work suggests a simple and economical method for the preparation of a 3-dimensional catalytic electrode.
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CHEMISTRY-A EUROPEAN JOURNAL
·
2019
·Vol. 25
·期 37
·8813-8819
·
IF 5.16
Jiao Zhang,Lin Zhou,Qujiang Sun,Hai Ming,Lianshan Sun,Chunli Wang,Yingqiang Wu,Kai Guan,Limin Wang,Jun Ming
Graphical Metal–organic assemblies for electrodes : A new metal–organic coordination strategy tuned by a surfactant is presented for the design of Mo-based hybrid materials ranging from 2D nanopetals to 3D microflowers. The new lithium-ion battery (LIB) of Ni-MoO 2 /N-C|LiNi 0.6 Co 0.2 Mn 0.2 O 2 with high rate features above 8 C is introduced. This strategy is applicable for greater capabilities, and the high-rate LIB can meet the requirements of fast-charging energy storage devices. Multi-dimensional metal oxides have attracted great attention in diverse applications due to their intriguing performances. However, their structural design remains challenging, particularly that based on organic chelation chemistry. Although metal–organic complexes with different architectures have been reported, their structure formation mechanisms are not well understood because of the complex chelation processes. Herein, we introduce a new metal–organic coordination strategy to construct metal-decorated (Ni, Co, Mn) Mo-based complexes ranging from 2D nanopetals to 3D microflowers. The chelating process of the metal–organic complex can be tuned by a surfactant, giving rise to different structures, and then a further metal can be appended. Thus, different metal (oxide)-decorated MoO 2 /C-N structures were designed, enabling an extremely high lithium storage capability of 1018 mA h g −1 and rate capacities of up to 10 A g −1 over 1000 cycles. Relationships between electrochemical behavior and structure have been analyzed kinetically. A high-rate lithium-ion battery has been assembled from Ni-MoO 2 /C-N and an Ni-rich layered oxide as the anode and cathode, respectively. We believe that this general metal–organic coordination strategy should be applicable to other multi-functional materials with superior capabilities.
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ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Sheng Liu,Wanwan Lei,Yan Liu,Qiquan Qiao,Wen-Hua Zhang
Hierarchical nanosheet-based nanotubes are very attractive because their unique structure endows them with large surface areas and exposes massive active sites for functional applications. We herein demonstrate a facile one-pot hydrothermal approach to fabricate the hierarchical nanosheet-based MS2 (M = Re, Mo, W) nanotubes by using Te nanowires as sacrificial templates. The hierarchical nanotubes show tube channels of ∼30 nm and hierarchical channel walls with a tunable thickness of up to ∼50 nm. As exemplified for application in Li-ion and Na-ion batteries, the ReS2 hierarchical nanotubes exhibit excellent specific capacities (1137 mA h g–1 for Li-ion batteries and 375 mA h g–1 for Na-ion batteries at 0.1 A g–1 after 100 cycles), good cycling stabilities, and high rate capabilities, demonstrating their promising applicability in rechargeable batteries. This work may open up new opportunities for further exploration of new types of hierarchical nanostructures for applications, e.g., in catalysis, energy chemistry, and gas adsorption and separation.
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Journal of Materials Chemistry A
·
2017
·Vol. 5
·期 8
·4075-4083
·
IF 8.867
Qiang Chen,Fengqi Lu,Ying Xia,Hai Wang,Xiaojun Kuang
New conceptions of developing various nanostructure materials supported on conductive substrates are urgently required for additive-free integrated electrodes for lithium ion batteries (LIBs). In this work, Mo-doped SnS2-based nanosheets were directly grown on a conductive substrate, carbon cloth, via a facile hydrothermal method. Significantly, the as-synthesized samples possess a three-dimensional network structure consisting of interconnected nanosheets, which can be directly employed as additive-free integrated electrodes for LIBs. The as-obtained CC@Sn0.9Mo0.1S2 nanosheets exhibit initial high discharge and charge capacities of 2033.6 and 1869.8 mA h g−1 at a current density of 1 A g−1, with a coulombic efficiency of 91.9%. A high reversible discharge capacity of 1950.8 mA h g−1 is obtained after 200 cycles. Moreover, a high reversible capacity of 914.5 mA h g−1 is achieved even at a high current density of 5 A g−1, which significantly exceeds the theoretical capacity of commercial graphite and reversible capacity of SnS2. A full lithium ion battery was assembled composed of the CC@Sn0.9Mo0.1S2 anode and a commercial LiCoO2 cathode, which also delivered high capacity and cycling stability. The excellent electrochemical lithium storage performance of Mo-doped SnS2 could be attributed to the molybdenum doping, which limited the number of layers of the nanosheets, enlarged the interlayer spacing and generated rich defects.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2016
·
IF 8.328
Haiping Li,Tingxia Hu,Renjie Zhang,Jianqiang Liu,Wanguo Hou
Up to now, studies on solid-state Z-scheme two-component heterojunctions have hardly referred to roles of interfacial internal electric fields (IEFs). Herein, solid-state Z-scheme Bi 2 MoO 6 /MO (M = Cu, Co 3/4 , or Ni) heterojunction photocatalysts were simply synthesized, for the first time, with enhanced photocatalytic performance toward organic degradation. Electron microscopy images reveal that the MO homogeneously distributes on surfaces of the Bi 2 MoO 6 hierarchical microspheres, and they close contact with distinct heterojunction interfaces. X-ray photoelectron spectra (XPS) suggest that the electron transfer occurs between the Bi 2 MoO 6 and MO after they contact, resulting in formation of IEFs at their interfaces. Based on band gap values and valance-band XPS and ultraviolet photoelectron spectra, energy band levels of the Bi 2 MoO 6 and MO are defined, and directions of the interfacial IEFs are determined. The IEFs play key roles for the formation of the Z-scheme Bi 2 MoO 6 /MO heterojunctions and for the photoactivity enhancement. This work provides a better insight into the formation mechanism of solid-state two-component Z-scheme heterojunctions and a significant experimental guidance for studying other similar systems.
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ACS Sustainable Chemistry & Engineering
·
2017
·
IF 5.951
Zhenzhen Yang,Wei Qi,Rongxin Su,Zhimin He
Three-dimensional flower-like Ce–Mo micro/nano composite oxides with different Ce/Mo atomic ratios (f-Ce10-xMoxOδ) were synthesized as effective bifunctional catalysts for one-pot conversion of fructose to 2,5-diformylfuran (DFF) via dehydration and aerobic oxidation. The catalytic activities of f-Ce10-xMoxOδ depended on their structure and physicochemical properties, which were closely related to their elementary compositions. The f-Ce9Mo1Oδ, which possesses polymeric octahedral MoOz species, the highest Oα ratio, BET surface area, and acidity density, exhibited the highest catalytic activity for DFF production. High DFF yields of 94% and 74% were obtained from f-Ce9Mo1Oδ catalyzed HMF oxidation and “one-pot” fructose conversion, respectively. Furthermore, f-Ce9Mo1Oδ is easily prepared, has low cost, and is ecofriendly, which has potential application in industrial production of DFF from fructose.
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