SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2024
·
IF 4.3
Dai Li,Huajie Chen,Yutao Zheng,Sheng Zhou,Fengyuan Yong,Xiangbo Zhang,Kui Wang,Huiyun Wen,Jiyong Wu,Weiming Xue,Saipeng Huang
Sulfur ion (S 2− ) plays a significant and considerable role in many living organisms and ecosystems, while its abnormal content can pose a serious hazard to human health and ecological environment. Hence, it is extremely meaningful to construct a highly sensitive and selective analytical platform for S 2− detection in complex microenvironment, particularly in biological systems. In this study, phosphomolybdic acid and L-Arg were utilized to prepare a new molybdenum doped carbon-dots nanozyme (Mo-CDs) with great peroxidase-like activity by one-step hydrothermal approach. In the presence of H 2 O 2 , Mo-CDs converted 3,3′,5,5′-tetramethyl benzidine (TMB) into blue oxTMB, but S 2− strongly reduced the blue solution to colorless and then brown, which established significant selectivity toward S 2− . Mo-CDs illustrated a wide linear range (2.5 μM–900 μM) and low detection limit (LOD = 76 nM) by ultraviolet and smartphone-assisted visualized colorimetric analysis. Especially, the smartphone-assisted analysis platform successfully realized quick, portable, sensitive and visible identification of S 2− with high recovery (95.7–106.7 %) and excellent specificity in water samples. More importantly, Mo-CDs was developed to antibacterial applications based on good peroxidase-like activity. This research not only constructed a new and efficient carbon-dots nanozyme and a low-cost, portable, visual analysis platform for real-time detection of S 2− , but also proposed a novel design strategy and methodology for exploiting multifunctional nanozyme detection tool with great practical application.
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MATERIALS CHEMISTRY AND PHYSICS
·
2024
·
IF 4.3
Lan Li,Runna Shi,Shuang Yan,Xiaoshi Lang,Kedi Cai
Lithium-ion hybrid supercapacitors as high-performance energy storage devices are proposed to bridge the electrochemical performances between lithium-ion batteries and supercapacitors . In this paper a novel Mo doping V 0.76 Mn 0.032 Ni 0.029 O 2 vanadium based ternary metal oxide is constructed as cathode active material for lithium-ion hybrid supercapacitor. Structural analysis demonstrates Mo doping as interlayer support can ameliorate the V 0.76 Mn 0.032 Ni 0.029 O 2 crystal structure and raise the lattice size thus providing more adequate mass transfer channels for lithium-ion storage. In addition, 5 % Mo doping V 0.76 Mn 0.032 Ni 0.029 O 2 represents relatively regular crystal particle arrangement with some integrated crystalline form and closely packing together. These structural features enable them to exhibit higher lithium storage performance and when as cathode active material for lithium-ion hybrid supercapacitor, it exhibits the lowest electrochemical and concentration polarization and the highest discharge specific capacities of 150.7, 140.2, 125.4 and 102.5 mAh.g −1 at different current densities along with a high capacity retention rate of 77.3 % at 1000 mA g −1 current density after 2000 cycles.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Ting Wang,Bowen Li,Ping Wang,Ming Xu,Dandan Wang,Yuqi Wang,Wenjing Zhang,Chaoqun Qu,Ming Feng
Heazlewoodite nickel sulfide (Ni 3 S 2 ) is advocated as a promising nonnoble catalyst for electrochemical water splitting because of its unique structure configuration and high conductivity. However, the low active sites and strong sulfur–hydrogen bonds (S–H ads ) formed on Ni 3 S 2 surface greatly inhibit the desorption of H ads and reduce the hydrogen and oxygen evolution reaction (HER and OER) activity. Doping is a valid strategy to stimulate the intrinsic catalytic activity of pristine Ni 3 S 2 via modifying the active site. Herein, the Ni foam supported Fe and Mo co-doped Ni 3 S 2 electrocatalysts (Fe-MoS 2 /Ni 3 S 2 @NF) have been constructed using Keplerate polyoxomolybdate {Mo 72 F 30 } as precursor through a facile hydrothermal process. Experimental results certificate that Fe and Mo co-doping can effectively tune the local electronic structure, facilitate the interfacial electron transfer, and improve the intrinsic activity. Consequently, the Fe-MoS 2 /Ni 3 S 2 @NF display more excellent HER and OER activity than MoS 2 /Ni 3 S 2 @NF and bare Ni 3 S 2 @NF by delivering the 10 and 50 mA cm −2 current densities at ultra-low overpotentials of 74/175 and 80/160 mV for HER and OER. Moreover, when coupled in an alkaline electrolyzer, Fe-MoS 2 /Ni 3 S 2 @NF approached the current of 10 mA cm −2 under a cell voltage of 1.60 V and exhibit excellent stability. The strategy to realize tunable catalytic behaviors via foreign metal doping provides a new avenue to optimize the water splitting catalysts.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2025
·
IF 3.9
Alfin Kurniawan,Jian Qiang Zhong,Ze Zhen Wang,Chun Hui Zhou
Allyl alcohol, an industrially valuable intermediate in organic synthesis, is conventionally produced through selective hydrogenation of acrolein and hydrolysis of chloropropene. However, these processes currently face challenges due to the unsustainability of fossil feedstocks. A more sustainable production of allyl alcohol from renewable feedstock (i.e., glycerol) has been demonstrated through gas-phase catalytic reaction over metal oxide catalysts with and without external H2. Improved understanding of the reaction mechanism of glycerol to allyl alcohol conversion is an important effort to rationally design more efficient catalysts. In this work, we investigate gas-phase conversion of glycerol to allyl alcohol through consecutive dehydration and hydrogen transfer reactions over Mo–V oxides supported on acid-modified montmorillonite (HMMT). The use of HMMT as a support enables the well dispersion of metal oxide particles with nominal loadings up to 5 wt % on the catalyst surface while the acidic sites facilitate dehydration of glycerol to acrolein with ∼74% selectivity. By modulating the nominal total Mo+V loading, Mo–V/HMMT catalyst with a 10 wt % metal loading afforded allyl alcohol in 22% yield at 320 °C and ambient pressure. X-ray photoelectron spectroscopic analysis of this bifunctional catalyst in the as-prepared and post-catalysis (spent) states showed changes in the surface Mo(VI)═O species and V4+/V5+ redox ratio; the latter was found to decrease due to the involvement of lower valence V4+ species in the hydrogen transfer reaction of acrolein. Meanwhile, the amount of surface Mo(VI)═O species with weak electronic metal–support interaction decreases after the reaction. Catalytic tests using an aqueous acrolein feed solution suggested the role of water as a hydride donor in transfer hydrogenation of this unsaturated aldehyde to allyl alcohol, while the addition of alcohol-containing compounds, such as 2-propanol and 1,2-propanediol leads to lower allyl alcohol selectivity with time on stream. The results presented here could guide the development of improved supported Mo−V oxide catalysts and reaction systems for efficient gas-phase glycerol conversion to allyl alcohol.
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CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Zhangqiao Zhou,Meiqi Wen,Qi Li,Ruilin Zhou,Xian Wang
Coatings play a crucial role in minimizing eddy current loss in soft magnetic composites (SMCs). The powder atomic layer deposition (PALD) technique was utilized to coat Fe–Ni–Mo soft magnetic powder in this study. The Al 2 O 3 coating fabricated via PALD enhanced corrosion resistance and reduced core loss in SMCs. Additional deposition cycles increased the resistivity of the Fe–Ni–Mo powder and the corrosion resistance of the Fe–Ni–Mo SMCs, indicating that the density and integrity of the amorphous Al 2 O 3 coating were enhanced. Thinner coatings (20 cycles) exhibited anodic passivation in corrosion, which was attributed to insufficient density. Nevertheless, an excessively thick coating (100 cycles) resulted in a decrease in effective permeability and an increase in hysteresis loss. The fabricated Fe–Ni–Mo SMCs (50 cycles) demonstrated a core loss of 603.1 mW/cm 3 at 100 kHz/100 mT, coupled with an effective permeability of 108.5 and a Q value of 97.8 at 100 kHz.
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Journal of Energy Storage
·
2024
·
IF 8.9
Wangqiong Xu,Xianrong Li,Baiyan Guo,Beituo Liu,Ruiming Yang,Shimei Guo,Zhe Li,Ruijuan Qi,Rong Huang
Critical barriers to the extensive applications of the spinel LiMn 2 O 4 cathodes include grievous capacity degradation and structural collapse. Bulk elemental doping combining surface modification, which is a common approach to address these challenges. Here, synchronous bulk Mo-doped and in-situ surface reconstructed layer coated LiMo 0.02 Mn 1.98 O 4 cathodes are prepared by tuning the annealing temperatures. Using the spherical aberration-corrected scanning transmission microscopy (Cs-STEM) technique, we demonstrate that part of Mo 6+ ions dopes into the octahedral Mn 16d sites to form LiMo 0.02 Mn 1.98 O 4 that strengthens bulk structural stability. The other part of Mo 6+ ions or the Mn atom occupying the Mn 16c sites of the spinel to form a surface reconstructed layer on the outermost surface that suppresses the side reaction and slows down the decomposition of the electrolyte. Specifically, the LiMo 0.02 Mn 1.98 O 4 cathode calcined at 750 °C with an appropriate surface reconstructed layer exhibits an outstanding capacity retention of 76.28 % after 1000 cycles at 10C at 25 °C. Our work provides a simple and novel way toward high electrochemical performance tuning for spinel LiMn 2 O 4 cathodes.
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Nano-Micro Letters
·
2025
·Vol. 17
·期 1
·1-17
·
IF 36.3
Zhou Wenbo,Huang Yichao,Cai Hanqing,Wang Tao,Li Haitao,Zhang Chao,Zhao Lianming,Chen Lulu,Liao Meihong,Tang Zhiqing,Chen Kai,Gu Jing,Gao Wenpei,Fan Zhuangjun,Wen Zhenhai
A strongly coupled platinum/molybdenum nitrides nanocluster heterostructure has been prepared by using Pt-containing Anderson-type polyoxometalates as precursors.
The pronounced electronic coupling at the Pt/Mo 2 N cluster interface facilitates the catalytic decomposition of H 2 O through synergistic stabilization of Pt-H * and Mo-OH * .
The optimized Pt/Mo 2 N-NrGO exhibits a remarkably low overpotential, high mass activity, and exceptional long-term durability (>500 h at 1500 mA cm -2 ) in a practical anion-exchange membrane water electrolyzer.
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Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Yijie Yang,Shun Yao,Ying Li,Yuanhang Wu,Chang Li,Congshu Hang,Hui Li
Development of efficient, low-cost, and bifunctional catalysts based on ultrathin heterostructures for both the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) is critical for advancing overall water splitting. In this study, we design a simple intercalation-sulfidation strategy by rigid segment-containing Polysulfide as a sulfur source and in-situ intercalation for the construction of the metastable 1 T'-2H'-phase Mo-Ni 3 S 2 heterostructures (1 T'-2H'-Mo-Ni 3 S 2 ). It is found that the Polysulfides with rigid segments can be controlled by various monomers reacted with reverse sulfurization reactions between various monomers and elemental sulfur, such as Poly (sulfur-random-1,3-Benzenedithiol), Poly (sulfur-random-1,4-Benzenedithiol), and Poly (sulfur-random-4,4′-Biphenyldithiol), which can be used to assist in the synthesis process of metastable. Attributing to favorable synergy interaction in composition and structure, the resultant 1 T'-2H' phase Mo-Ni 3 S 2 heterostructures shows the superior performances toward OER and water splitting in alkaline medium. The resultant Mo-Ni 3 S 2 -BDP needs only an overpotential of 103 mV at a current density of 10 mA cm −2 and for OER. For HER, it demonstrates a low overpotential of 136 mV at 10 mA cm −2 , and a relatively low cell voltage of 1.672 V for water splitting. The present provides a new strategy to design and develop the phase engineering of other materials with various Polymorphs.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Qiangqiang Shi,Shuling Liu,Xinyue Liu,Jiale Guo,Zhipeng Qin,Jianbo Tong
The development of high-performance anode materials for sodium-ion batteries (SIBs) remains critical to overcome the limitations of lithium-ion technologies. In this work, Mo-doped Ni 2 P encapsulated in nitrogen-doped carbon (Mo-Ni 2 P@NC) SIB anodes with nanosheet-stacked porous architectures through a solvothermal and chemical vapor deposition (CVD) approach were synthesized. X-ray diffraction (XRD) and transmission electron microscopy (TEM) analyses confirmed lattice expansion due to Mo substitution. Electrochemical evaluations revealed that Mo doping significantly enhanced the initial Coulombic efficiency (ICE) from 51.6 % (pristine Ni 2 P) to 70.2 % and achieved a reversible specific capacity of 456 mAh g −1 at 2.0 A g −1 after 2000 cycles. Density functional theory (DFT) calculations demonstrated that Mo doping induced charge redistribution, lowered Na + adsorption energy. Furthermore, vacancy defects produced by Mo-doping facilitate rapid ion transport and pseudocapacitive-dominated Na + storage behavior minimized volume changes, ensuring long-term stability. Simultaneously, the optimized Mo-Ni 2 P@NC-2||Na 3 V 2 (PO 4 ) 3 /C full-cell delivered 143 mAh g −1 after 200 cycles at 0.1 A g −1 , highlighting its practical application. This work elucidates the synergistic effects of heteroatom doping and vacancy in enhancing SIB anode performance, providing a strategy for designing high-ICE and durable energy storage materials.
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ADVANCED FUNCTIONAL MATERIALS
·
2024
·Vol. 34
·期 40
·2404055
·
IF 18.5
Guangfu Qian,Yunpeng Wang,Liancen Li,Minsheng Lu,Changzhou Chen,Douyong Min,Zengxi Wei,Panagiotis Tsiakaras
Developing high-activity non-noble metal catalysts for improving the ability of water dissociation and H* adsorption/desorption in the hydrogen evolution reaction (HER) process in alkaline and neutral electrolytes is essential but remains challenging. Herein, a Mo-doped NiCoCu alloy with tuned tensile strain and localized electrons is designed and synthesized by combining the solvothermal and annealing methods for achieving ampere-level HER performance. Theoretical calculation results prove that Mo doping induces lattice tensile strain and localized electrons (electrons from Mo to the Ni/Co/Cu atoms), promoting the adsorption of O* and H* from H 2 O molecules on the Mo and Co sites and accelerating water dissociation. Therefore, NiCoCu-Mo 0.078 /CF (CF = copper foam) shows low water dissociation energy, providing sufficient H* during the HER process. Meanwhile, its H* Gibbs free energy value is near zero, implying a rapid H* adsorption/desorption process. Electrochemical results show that NiCoCu-Mo 0.078 /CF achieves better HER intrinsic activity in both a 1.0 m KOH ( η −10 /η −1000 = 35/212 mV) and a 1.0 m phosphate buffer solution ( η −10 /η −1000 = 24/256 mV) compared to NiCoCu-Mo 0 /CF and NiCoCu-Mo 0.163 /CF, and it can continuously operate for 100 h at −1000 mA cm −2 . This work shows a sustainable way to design high-performance catalysts for water electrolysis and proposes a well-performing HER catalyst.
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EES Catalysis
·
2025
·
IF 8.1
Guangxun Sun,Peng Xue,Changle Yue,Yang Li,Hongfu Shi,Xin Zhang,Fengyu Tian,Junxi Li,Zekun Guan,Bin Liu,Zhi Liu,Yunqi Liu,Yuan Pan
The development of a synergistic coupling catalyst at the atomic scale for slurry-phase hydrogenation of vacuum residue (VR) is extremely challenging. Herein, we designed and constructed a robust coupling catalyst comprising Mo single atoms and MoS2 (Mo SAs–MoS2) using a reaction induction transformation strategy. The spontaneous generation of Mo SAs–MoS2 synergistically promoted H2 activation and enhanced local active hydrogen concentration in the hydrogenation of VR. Benefiting from the strong hydrogen concentration distribution in MoS2 and Mo SAs, the catalyst revealed remarkable hydrogenation performance toward VR with a TOFT of up to 0.39 s−1, liquid product yield of 92 wt%, and coke content of 0.6 wt%. Theoretical calculations revealed that the synergistic action of Mo SAs–MoS2 facilitated electron transfer between Mo species and reactants, reducing the desorption energy barriers for H2 and anthracene and thereby promoting the hydrogenation of VR. This work provides a novel idea for the design of efficient coupling catalysts for strengthening local active hydrogen concentration in the hydrogenation of VR, and this concept can be applied to other hydrogenation systems.
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Chemical Science
·
2025
·
IF 7.4
Yang Sun,Fan Yang,Kexin Wei,Siyuan Sun,Li Sun,Junpu An,Chunhui Yu,Qing Guo,Conghan Zhang,Guang Ma,Hongchen Liu,Yongfeng Li
Constructing an asymmetric charge distribution and built-in electric field (BIEF) has proven to be an effective strategy for enhancing the catalytic performance of both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) catalysts. Herein, a Mo-doped Ni/WO3 heterojunction catalyst was immobilized on Ni foam for enhancing the performance of the HER and OER. The constructed Ni/WO3 heterointerface facilitates electron transport, while the incorporation of Mo further amplifies charge asymmetry in the interfacial region. The optimized Mo3–Ni/WO3 catalyst exhibits excellent performance, requiring only 13 mV and 328 mV overpotential to reach current densities of 10 and 100 mA cm−2 for the HER and OER, respectively. Besides, it maintains stable overall water splitting performance at 100 mA cm−2 for 90 h. The asymmetric distribution of Ni/WO3 interfacial charge is promoted and electron transport is enhanced by Mo doping. Theoretical results show that element doping in the heterostructure turns W sites into additional adsorption centers, optimizing the energetics of H* adsorption during the HER. Mo doping reduces the work function (φ) of Mo3–Ni/WO3, promoting efficient electron transfer and lowering the energy barrier for intermediate formation, thereby enhancing OER activity. This strategic modulation of charge asymmetry in heterojunction architectures provides a new approach for the rational design of high-performance bifunctional electrocatalysts.
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