ADVANCED FUNCTIONAL MATERIALS
·
2024
·
IF 18.5
Yuhua Xie,Yumei Feng,Shuyuan Pan,Haifeng Bao,Yingjie Yu,Fang Luo,Zehui Yang
The commercialization of water-splitting technology strongly relies on the stable and high-performance electrocatalyst for hydrogen and oxygen evolution reactions (HER-OER). In this work, the nickel dopants in IrRu alloyed electrocatalyst for acidic water splitting activity are investigated. The incorporation of nickel dopants induces more oxygen atoms coordinating with Ir/Ru facilitating the formation of *OOH species via nucleophilic attack by H 2 O. Additionally, a fast surface reconstruction is achieved due to the electrochemical dissolution of Ni dopants; as a result, more oxygen species are incorporated, evidenced by in situ Raman spectroscopy and electrochemical impedance spectroscopy. Therefore, the mass activity for Ni@IrRu is enhanced by threefold than commercial IrO 2 in acidic OER catalysis. Moreover, the nickel dopants balance the hydrogen binding strength; as a result, only 609 mV overpotential is demanded to reach 1 A cm −2 in acidic HER catalysis. The polymer electrolyte membrane water electrolyzer (PEMWE) test indicates only 1.87 V is required to attain 2 A cm −2 , 160 mV lower than Pt/C-IrO 2 revealing its potential application in PEMWE.
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DOI
高影响因子
RSC Advances
·
2025
·Vol. 15
·期 18
·14235-14245
·
IF 4.6
Tong Su,Daguo Wu,Xinghua Zhang,Qi Zhang,Lungang Chen,Xiuzheng Zhuang,Longlong Ma
Biomass is an important renewable resource in nature, and cellulose is a crucial component within it. The chemically directed conversion of cellulose into ethylene glycol offers a green alternative to traditional petroleum-based production methods. In this study, a multifunctional Ni–WOx/SAPO-11 catalyst was designed. By optimizing the processing parameters of catalysts and the reaction conditions of them, it was demonstrated that this catalyst could efficiently catalyze cellulose into alcohol products through a series of tandem reactions such as hydrolysis, retro-aldol condensation, and hydrogenation under relatively mild conditions. The yield of ethylene glycol climbed from 4% (at 180 °C) to 66.6% (at 240 °C) with the increase of reaction temperature. Characterization (XPS, TEM, TPD/TPR) revealed that a reduction temperature of 500 °C maximized Brønsted acidity and W5+/W6+ ratios, enhancing C–C cleavage efficiency. Further increases in the reduction temperature would weaken the Brønsted acid on the surface of SAPO-11, but its surface area would also increase (mainly in the form of mesopores). The uniformly dispersed elemental tungsten could form new acidic sites on the catalyst surface; in combination with active Ni0, this high-temperature reduced catalyst could achieve the direct hydrogenolysis of cellulose to produce ethylene glycol, benefiting the efficient utilization of lignocellulosic biomass in the future.
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DOI
PubMed
高影响因子
ACS Catalysis
·
2025
·
IF 13.1
Yanchun Shi,Jimei Zhang,Sihan Sun,Bi Wu,Lei Wang,Yulong Wu,Dingsheng Wang
Upgrading lignin-derived phenols to high-value arenes has garnered significant attention, while the major challenge lies in the selective cleavage of Caromatics–OH via hydroxyl hydrogenolysis. We systematically investigated the morphology-dependent properties of Ni@S-1 catalysts, encompassing their physicochemical characteristics, Ni nanoparticle properties, and the interaction between NiOx species and silicalite-1 (S-1) crystals as well as their performance in hydroxyl hydrogenolysis of vapor-phase m-cresol conversion. Both Ni@S-1 exhibited comparable Ni loading and crystal sizes but distinct morphologies, which originated from the complex intergrowth structures leading to variations in the dispersion and the location of Ni nanoparticles and significant differences in the shape-selective catalysis based on the confinement effect of S-1 channels for the vertical adsorption of m-cresol. Ellipsoidal Ni@S-1-Ell achieved m-cresol conversion of 96.9% (model reaction) along with hydrogenolysis products’ yield of 94.0%, which was 6.97 times in conversion and 22.38 times in yield of hydrogenolysis products than those of cylindrical Ni@S-1-Cyl under identical reaction conditions at 300 °C, 2.5 atm, and a feed rate of 6.0 g[m-cresol]/g[catalyst]·h.
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高影响因子
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
·
2025
·
IF 3
Qi Li,Zhangqiao Zhou,Yan Nie,Lu Yang,Yu Wang,Jinsong Chen,Xian Wang
The preparation of soft magnetic composites requires effective surface modification of alloy powder to enhance insulating properties and achieve dense, uniform coating layers. Firstly, the gas-atomized Fe-Ni-Mo powder was surface modified using the atomic layer deposition method, forming a uniform and dense Al 2 O 3 insulating layer. The secondary surface modification of organic polymers further improves the properties of soft magnetic composites. This study systematically evaluates the effects of the primary and secondary surface modification on the properties of powder particles and soft magnetic composites. The primary modification generates an extremely thin insulating layer of approximately 2.5 nm, which increases the particle resistivity by 9 orders of magnitude. The permeability frequency stability of the soft magnetic composites increased from 11.3 % to 96.5 %, resulting in significant core loss reduction. The secondary modification effectively enhances the formability of soft magnetic composites. Optimal permeability of 242.7 at 1 kHz is achieved, maintaining 95.2 % frequency stability up to 1 MHz, while core loss remains below 570 mW cm −3 under 100 kHz/100 mT conditions. The surface treatment method in this work can provide a reference for the surface insulation modification of soft magnetic composites.
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DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2025
·
IF 3.3
Zhouwei Li,Lianzhong Shen,Yu Ye,Qizhou Dai
An Ni-doped PbO2 electrode (Ti/TNAs/Ni-PbO2) with titanium dioxide nanotube arrays (TNAs) self-growth on the titanium metal surface as an intermediate layer was prepared by electrodeposition. Characterization and electrochemical testing of the Ti/TNAs/Ni-PbO2 showed a denser surface structure, a larger surface active area (0.50 m2 g-1), and smaller crystallite size (38.61 nm), which provided more surface active sites and promoted the generation of hydroxyl radicals (•OH). The electrocatalytic ozonation process was established using the electrode. The sulfamethazine (SMT) was selected as the target contaminant. The performance on SMT removal in electrocatalytic ozonation was systematically evaluated. The effects of initial SMT concentration, current density, electrolyte concentration, initial pH, and ozone dosage on the degradation rate of SMT and chemical oxygen demand (COD) removal were also investigated. Under optimal conditions, after 60 min of degradation, the removal rates of SMT and COD reached 100% and 46.13%, respectively. Intermediates in the degradation process were identified by ultra-performance liquid chromatography-quadrupole time-of-flight tandem mass spectrometry, and the degradation mechanism and degradation pathways of the Ti/TNAs/Ni-PbO2 anode in the electrocatalytic ozonation process were explored. The excellent efficacy and stability of this anode in this process were verified and showed a potential for widespread application in highly concentrated organic wastewater treatment
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高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Pingping Wu,Lei Song,Xingwang Zhang,Yingqi Zhang,Peng Bai,Lianming Zhao,Zifeng Yan
The balance between catalytic activity and product selectivity remains a challenge in partial oxidation reactions, because its products are prone to be further oxidized. In this paper, a small amount of Ni was introduced on the surface of the supported AuPd alloy nanoparticles (NPs) as a promoter to construct the Ni/AuPd interface for benzyl alcohol partial oxidation, which helped to improve the selectivity of benzaldehyde. The results showed that the introduction of a small amount of Ni (<0.5 wt%) led to no obvious change of the catalytic activity, but the selectivity of benzaldehyde was greatly improved. When Ni content exceeds 1.0 wt%, the benzyl alcohol conversion decreased significantly. This is mainly because a large amount of Ni led to an obvious aggregation of Pd on the catalyst and a large amount of surface Ni species partially covered the active components, resulting in a low catalytic activity. Introducing a small amount of Ni improved the benzaldehyde selectivity and Ni species presented as NiO and NiOOH on catalyst xNi/AuPd/MCF-H. Theoretical calculation results show that the improved benzaldehyde selectivity was attributed to the easy desorption of benzaldehyde from NiO and NiOOH surfaces.
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高影响因子
Sustainable Materials and Technologies
·
2025
·
IF 9.2
Haize Jin,Xiaoxia Huang,Wen Yijun,Mengyao Zhu,Cuixia Li,Qikun Wang
Photothermal synergistic catalysis provides an efficient implementation strategy for CO₂ conversion into renewable energy. Here, we synthesized a geopolymer/g-C₃N₄/Ni(OH)₂ (GCN) photothermal catalyst featuring nanoscale-interval exposed adsorption and photothermal catalytic active sites through concurrent geopolymerization and alkaline precipitation reactions. The rational modulation of Ni(NO₃)₂ proportion induced explosive nucleation of Ni(OH)₂, ultimately resulting in a nanostructure where geopolymer nanoclusters and Ni(OH)₂ nanocrystals were intergrowth on the g-C₃N₄ interface. The construction of this ternary system effectively enhanced the photogenerated electrons transfer efficiency, and synergized with the thermal effect to significantly improve CO₂ reduction efficiency. And the GCN demonstrated exceptional capture capabilities for both CO₂ and H₂. Under light irradiation, GCN exhibited non-thermal photochemical effect characteristics. Through the photo-assisted thermal catalysis synergistic action, the CO₂ conversion product rate reached 1057.89 mmol.g cat −1 .h −1 , which was 17,869.84 times and 1.16 times higher than those under pure photocatalysis and pure thermal catalysis, respectively. The corresponding CO selectivity can reach 96.05 %. And GCN exhibited stable photothermal cycling performance, the production rate in the 10th cycle still reached 970.28 mmol·g cat −1 ·h −1 . Moreover, the formation of chemical bonds at the geopolymer/Ni(OH)₂ interface effectively suppressed the excessive reduction of Ni(OH)₂ to metallic Ni 0 , thereby inhibiting deep hydrogenation of CO and ensuring high CO selectivity. This study provides both theoretical and technical foundations for the development of low-cost and high-efficiency CO₂ photothermal reduction catalysts.
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高影响因子
Surfaces
·
2025
·Vol. 8
·期 3
·60
·
IF 2.9
Yanying Zhu,Yanxiang Wang,Jianwei Zhang,Jinghe Guo,Yingfan Li,Siao Xin,Ziyi Xu,Yanru Yuan,Dong Zhang
Surface modification of carbon fibers (CFs) is a critical step in preparing carbon fiber-reinforced composites. This study developed a continuous experimental process that integrates electrochemical anodic oxidation and chemical vapor deposition to fabricate carbon nanotubes/carbon fiber (CNTs/CF) reinforcements. The effects of temperature and hydrogen flow rate during CNT growth on the resulting reinforcements were systematically investigated. The surface morphology and mechanical properties of the modified materials were characterized using scanning electron microscopy, Raman spectroscopy, and single-fiber tensile testing. Employing an Fe0.5Ni0.5bimetallic catalyst under optimized conditions (550 °C, H2flow rate: 0.45 mol/min, C2H2flow rate: 0.30 mol/min), the resulting reinforcement exhibited an 8.7% increase in tensile strength compared to as-received CF.
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高影响因子
Metals
·
2024
·Vol. 14
·期 9
·1047
·
IF 2.6
Jianguo Liu,Songlin Tong,Shuaihua Wang,Zhiyao Wan,Xiao Xing,Gan Cui
Superamphiphobic coatings have shown great potential in many fields such as with their anti-corrosion, high-temperature resistance, self-cleaning, and drag reduction properties. However, due to the poor stability of their coatings, it is difficult to apply them on a large scale. In this paper, two kinds of SiO2particles and nickel were co-deposited on the surface of steel to construct a micro/nano dual-scale structure by composite electrodeposition. The surface of the coating was then fluorinated with the low-surface-energy material 1H,1H,2H,2H-Perfluorodecyltriethoxysilane (AC-FAS) to prepare a Ni-SiO2superamphiphobic coating. The coating has a water contact angle of 159° and an oil contact angle of 151°. The effect of nanoparticle concentration on the wettability and surface morphology of the coating was systematically studied. Comparative experiments revealed that the optimal micro/nanoparticle concentrations were 8 g/L of 20 nm SiO2and 2 g/L of 1 μm SiO2. This preparation method greatly improves the corrosion resistance, wear resistance, chemical stability, and high-temperature resistance of the coating.
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高影响因子
ACS Applied Energy Materials
·
2025
·
IF 5.5
Ying Zhang,Yuxuan Chen,Tong Zheng,Juan Mu,Zhengwang Zhu,Haifeng Zhang,Yandong Wang
Ammonia borane (AB) has drawn extensive attention in hydrogen production research due to its excellent hydrogen-storage properties. To address the challenges of agglomeration and difficult recovery associated with nanocatalysts, a series of macroscopic five-component, non-noble metal catalysts were fabricated via rapid solidification. With increasing Ni content, the catalyst transforms from a biphase structure with Mn solid-solution distributed on the face-centered cubic (FCC) matrix to a single-phase FCC structure. The distribution of the Mn element undergoes the following changes: solid-solution phase → grain-boundary segregation → uniform distribution. The catalytic activity shows a parabolic trend with the microstructural evolution of the catalyst. Among them, the Ni13.5 alloy exhibits the highest catalytic activity and excellent cycling stability, achieving a catalytic rate of 1292 mL–1·min–1·m–2 under standard conditions. Also, the activation energy is 15.13 kJ mol–1, which is lower than many nickel-based catalysts. The excellent catalytic performance of Ni13.5 can be attributed to two aspects. First, Mn segregation at grain boundaries accelerates etching, exposing numerous catalytically active Ni elements on the surface. Second, the electron enrichment around Ni enhances the catalytic activity. This study provides valuable insights for the design and development of macroscopic scale catalysts in hydrogen-related catalysis.
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高影响因子
NANO
·
2025
·
IF 1.1
Xiaoying Lin,Lifang Xu,Songye Lin,Hao Lin,Tao Guo,Yuqi Li,Yamin Liu
The synthesis of magnetic porous carbon nanocomposites derived from a nickel-based metal-organic framework (Ni-MOF) via a simple solvothermal approach is reported herein. The potential of these materials for the adsorption of methyl blue (MB) dye was investigated. The physicochemical properties of the Ni-MOF-C materials were comprehensively characterized using powder X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), energy dispersive spectrometry (EDS), N 2 adsorption/desorption isotherms, and vibrating sample magnetometry (VSM). At a carbonization temperature of 550 ∘ C, Ni-MOF-C exhibited a maximum specific surface area of 162.17 m 2 /g and saturation magnetization of 32.27 emu/g. The material was employed for the physical adsorption of Coomassie methylene blue dye, with adsorption influenced by pH, initial dye concentration, contact time, and temperature. Under optimized conditions, including a feed pH of 10, an initial dye concentration of 1000 mg/L, a contact time of 60 min, and a temperature of 55 ∘ C, Ni-MOF-C-550 ∘ C demonstrated its highest MB dye adsorption capacity. Furthermore, the observed adsorption behavior was effectively described by both the Freundlich isothermal adsorption model and the quasi-second-order kinetic model.
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高影响因子
PROPELLANTS EXPLOSIVES PYROTECHNICS
·
2021
·Vol. 46
·期 10
·1598-1610
·
IF 1.887
Xiaoxia Ma,Xi Chen,Yuxiang Li,Zhiqiang Qiao,Guangcheng Yang,Kaili Zhang
The afterburning effect of aluminized explosives makes them have strong damage ability to soft targets, but the aluminum particles in the composition often cannot achieve proper combustion. The high ignition temperature of micron aluminum powder is one of the main reasons. In this work, we introduce nanothermite reaction with low onset temperature (<660 °C) into aluminized explosives by replacing the base explosives with energetic coordination polymers (ECPs). The decomposition products of many ECPs contain corresponding metal oxides that will react with aluminum via thermite reaction. Three kinds of ECPs ([CoC 2 H 4 N 8 O 4 ] n , [NiC 2 H 4 N 8 O 4 ] n and [CuC 2 H 4 N 8 O 4 ] n ) are constructed and compounded with nano-aluminum (nano-Al) particles to form aluminized ECPs. The influence of metal ion species and Al/Metal (Al/Me) molar ratio on their energetic properties are systematically studied. The results show that the exothermic thermite reaction with low onset temperature plays an important role in the combustion propagation of aluminized ECPs, and the possible mechanism is proposed. When the Al/Me molar ratio is 3–4, the aluminized ECPs have the best peak pressure and pressurization rate. At the optimum molar ratio, the pressure and pressurization rate of aluminized ECP(Co) are much higher than those of aluminized ECP(Ni) and ECP(Cu). Among the three kinds of aluminized ECPs, the aluminized ECP(Co) has the best energetic characteristics and can be used as a preferred choice. However, for the applications that require a long-time heat supply, aluminized ECP(Cu) will be suitable.
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高影响因子
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