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1دورية أكاديمية
المؤلفون: Faisal Rasool, Bilal Masood Pirzada, Shamraiz Hussain Talib, Tamador Alkhidir, Dalaver H. Anjum, Sharmarke Mohamed, Ahsanulhaq Qurashi
مصطلحات موضوعية: Medicine, Neuroscience, Biotechnology, Evolutionary Biology, Space Science, theoretical calculations confirmed, step solvothermal method, step interfacial activation, remarkable tafel slope, promotes charge transfer, much safer method, fourier transform infrared, facile solvothermal method, best activity toward, among various loadings, tem ), raman, situ hf formation, ray photoelectron spectroscopy, low overpotential value, hydrogen evolution reactions, mxene sample exhibited, 3 , 2 , situ growth, ray diffraction, overpotential barrier, ftir ), hydrogen production, hydrogen adsorption
الوصف: In line with current research goals involving water splitting for hydrogen production, this work aims to develop a noble-metal-free electrocatalyst for a superior hydrogen evolution reaction (HER). A single-step interfacial activation of Ti 3 C 2 T x MXene layers was employed by uniformly growing embedded WS 2 two-dimensional (2D) nanopetal-like sheets through a facile solvothermal method. We exploited the interactions between WS 2 nanopetals and Ti 3 C 2 T x nanolayers to enhance HER performance. A much safer method was adopted to synthesize the base material, Ti 3 C 2 T x MXene, by etching its MAX phase through mild in situ HF formation. Consequently, WS 2 nanopetals were grown between the MXene layers and on edges in a one-step solvothermal method, resulting in a 2D–2D nanocomposite with enhanced interactions between WS 2 and Ti 3 C 2 T x MXene. The resulting 2D–2D nanocomposite was thoroughly characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Raman, Fourier transform infrared (FTIR), and X-ray photoelectron spectroscopy (XPS) analyses before being utilized as working electrodes for HER application. Among various loadings of WS 2 into MXene, the 5% WS 2 –Ti 3 C 2 T x MXene sample exhibited the best activity toward HER, with a low overpotential value of 66.0 mV at a current density of −10 mA cm –2 in a 1 M KOH electrolyte and a remarkable Tafel slope of 46.7 mV·dec –1 . The intercalation of 2D WS 2 nanopetals enhances active sites for hydrogen adsorption, promotes charge transfer, and helps attain an electrochemical stability of 50 h, boosting HER reduction potential. Furthermore, theoretical calculations confirmed that 2D–2D interactions between 1T/2H-WS 2 and Ti 3 C 2 T x MXene realign the active centers for HER, thereby reducing the overpotential barrier.
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2دورية أكاديميةBoosting Direct Seawater Electrolysis through Intercalation Engineering of Layered Double Hydroxides
المؤلفون: Haodong Qi, Kai Huang, Fenghongkang Pan, Rongting Ma, Cheng Lian, Honglai Liu, Jun Hu
مصطلحات موضوعية: Biochemistry, Pharmacology, Biotechnology, Evolutionary Biology, Ecology, Immunology, Cancer, Inorganic Chemistry, Computational Biology, Space Science, Physical Sciences not elsewhere classified, high electrocatalytic activity, water splitting directly, least 500 h, chlorine corrosion resistance, 3 +, sup >–, ni foam required, alkaline natural seawater, seawater splitting, deliver 500, catalyst corrosion, situ growth, promising strategy, oer ), long sought, great significance, excluding cl, excellent stability, 335 mv
الوصف: Hydrogen production by water splitting directly from seawater is of great significance, where electrocatalysts with both high electrocatalytic activity and chlorine corrosion resistance have been long sought after. Herein, intercalation of Mo(VI) ions in NiFe layered double hydroxide (LDH) was engineered for boosting the electrocatalytic oxygen evolution reaction (OER). The intercalated Mo(VI) with high valence states facilitated NiFe LDH self-reconstruction through inducing the formation of Ni 3+ sites; meanwhile, its volumetric and electrostatic repulsion synergistically inhibited the catalyst corrosion through excluding Cl – from intercalation. As a result, the in situ growth of Mo 0.25 -NiFe LDH on Ni foam required an overpotential as low as 335 mV to deliver 500 mA cm –2 in alkaline natural seawater with excellent stability for at least 500 h, being one of the top electrocatalysts so far as we know. Therefore, this convenient intercalation engineering provided a promising strategy for seawater splitting.
الإتاحة: https://doi.org/10.1021/acs.iecr.3c03014.s001Test
https://figshare.com/articles/journal_contribution/Boosting_Direct_Seawater_Electrolysis_through_Intercalation_Engineering_of_Layered_Double_Hydroxides/24550831Test -
3دورية أكاديمية
المؤلفون: Yang Zhang, Xiran Tang, Huan Li, Zhiheng Zhao, Yang Pan, Lingtong Li, Hong Wu, Shaoyun Guo
مصطلحات موضوعية: Microbiology, Physiology, Evolutionary Biology, Ecology, Inorganic Chemistry, Space Science, Chemical Sciences not elsewhere classified, resultant film achieved, reflection electromagnetic interference, generation electronic equipment, em wave absorption, electrospun tpu films, composite film showed, 49 w /(, 3 ° c, 1 sun ), thermal management performances, plane thermal conductivity, 6 ° c, 6 v ), 4 , 3 , high saturated temperature, saturated temperature, thermal conduction, upper layer, situ growth, pressing approaches, photothermal conversion, microelectronic systems
الوصف: Low-reflection electromagnetic interference (EMI) shielding composites are crucial to next-generation electronic equipment. Moreover, it is highly desirable to integrate thermal management performance into the composites to broaden their applications. Herein, a bilayered EMI shielding composite film with thermal management performances was fabricated successfully via electrospinning, in situ growth, and hot-pressing approaches. Fe 3 O 4 particles are distributed in the upper layer for EM wave absorption and photothermal conversion, while Ag particles are distributed in the lower layer for EMI shielding, thermal conduction, and electrothermal conversion. The resultant film achieved a remarkable EMI shielding effectiveness of 98.2 dB with an average reflection coefficient value as low as 0.64. Subsequently, the composite film showed an optimum in-plane thermal conductivity of 6.49 W/(m·K), due to the three-dimensional (3D) interconnected network of Ag particles. In addition, the upper layer of the composite film exhibited admirable photothermal conversion performance, reaching a saturated temperature of 91.3 °C (1 sun). Meanwhile, the lower layer of the composite film showed favorable electrothermal conversion performance, contributing to a high saturated temperature of 92.6 °C (6 V). This work would propose one novel strategy for developing low-reflection EMI shielding composite films integrated with multiple thermal management functionalities in microelectronic systems.
الإتاحة: https://doi.org/10.1021/acs.iecr.3c03723.s002Test
https://figshare.com/articles/journal_contribution/Bilayered_Distribution_of_Ag_and_Fe_sub_3_sub_O_sub_4_sub_in_Electrospun_TPU_Films_for_Low-Reflection_Electromagnetic_Interference_Shielding_and_Multiple_Thermal_Management_Functionalities/24878244Test -
4دورية أكاديمية
المؤلفون: Ruilin Zheng (4705894), Jumpei Ueda (2888486), Kenji Shinozaki (1918237), Setsuhisa Tanabe (2242492)
مصطلحات موضوعية: Biophysics, Cell Biology, Physiology, Biotechnology, Evolutionary Biology, Ecology, Developmental Biology, Inorganic Chemistry, Space Science, Environmental Sciences not elsewhere classified, Biological Sciences not elsewhere classified, Chemical Sciences not elsewhere classified, Physical Sciences not elsewhere classified, successfully elucidated via, including mechanical force, analytical electron microscopy, embedded amorphous materials, 3 , 2 , amorphous oxide matrix, situ growth mechanism, qd glass showed, halide quantum dots, halide perovskite qds, amorphous matrix, quantum dots, traditional glass, situ spectroscopy, results showed, halide qds
الوصف: Oxide glass matrix embedding is an effective way to improve the stability of halide quantum dots (QDs). However, the in situ growth mechanism of halide perovskite QDs in an amorphous matrix has not been clarified. In this work, the growth process of halide QDs in an amorphous oxide matrix was successfully elucidated via in situ spectroscopy, analytical electron microscopy, and the X-ray scattering/diffraction technique. The results showed that the in situ growth mechanism of the halide QDs in the amorphous oxide matrix was different from that of traditional glass-ceramics, which was more like a halide nanoglass-based phase transition process. Typically, a complex multiphase (halide nanoglass, CsPb 2 X 5 , and CsPbX 3 ) transition existed in the amorphous oxide matrix, and the obtained CsPbX 3 QD glass showed a halide multiphase coexisting microstructure. More importantly, the crystallization process from the halide nanoglass to QDs can be induced by known ways, including mechanical force, hydration, and heat treatment. The clarified in situ growth mechanism may pave the way toward the development of high-efficiency halide perovskite QD-embedded amorphous materials and optoelectronic devices.
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5دورية أكاديمية
مصطلحات موضوعية: Microbiology, Biotechnology, Evolutionary Biology, Ecology, Sociology, Marine Biology, Computational Biology, Chemical Sciences not elsewhere classified, significant importance due, natural solar energy, level synergistic effects, high transfer rate, exceptional catalytic ability, 2 times higher, aqueous antibiotic degradation, ultrafast antibiotic degradation, polydopamine heteronanotube photocatalysts, dimensional cadmium sulfide, ultrafast degradation, cadmium sulfide, photocatalysts used, doped polydopamine, situ growth, severe threats, photogenerated holes, photocatalytic mechanism, major challenge, key roles, important engineering, human health
الوصف: The removal of antibiotics in environmental water is of significant importance due to their severe threats to human health and the ecosystem balance but remains as a major challenge. Visible-light photocatalytic degradation provides a desirable way to dispose of antibiotics by natural solar energy. Herein, cadmium sulfide-doped polydopamine (CdS/PDA) heteronanotubes (HNTs) featuring superior photocatalytic capability for ultrafast antibiotic degradation under visible light (14.2 times higher than traditional CdS) was developed via an in situ coordination polymerization strategy. The exceptional catalytic ability was attributed to multiple-level synergistic effects between PDA and CdS. PDA nanotubes (NTs) served as a scaffold for in situ growth of CdS nanocrystals, and the resulting CdS/PDA heterostructures exhibited strong visible-light-harvesting capability and a high transfer rate of photogenerated electron–hole pairs. Furthermore, the photocatalytic mechanism of the CdS/PDA HNTs toward model molecule tetracycline is disclosed in detail, and it is shown that superoxide radical anions ( • O 2 – ) and photogenerated holes (h + ) play the key roles in the decomposition of tetracycline. Our findings demonstrate that the incorporation of PDA NTs as the scaffold is a feasible strategy to enhance the visible-light sensitivity of photocatalysts used in aqueous antibiotic degradation. This work provides new insights into the development of new functional nanocomposite catalysts with important engineering and environmental applications.
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6دورية أكاديمية
المؤلفون: Qingtao Wang (138989), Kai Cui (239147), Dongxu Liu (547486), Yanxia Wu (741216), Shufang Ren (9680974)
مصطلحات موضوعية: Biophysics, Biochemistry, Evolutionary Biology, Developmental Biology, Infectious Diseases, Computational Biology, Environmental Sciences not elsewhere classified, Chemical Sciences not elsewhere classified, oxygen evolution reaction, hydrogen evolution reactions, hydrogen evolution reaction, graphitic carbon nitride, carbon composite electrocatalysts, synthesizing various metal, nc nanosheets anchor, situ growth method, doped carbon, preparation method, effective method, metal electrocatalyst, metal dual, renewable energy, rational design, provides ideas, nc ), n atoms, manufacturing high, major challenges, layer capacitance, large number
الوصف: The rational design and synthesis of a non-noble-metal electrocatalyst for the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) with good conductivity, high efficiency, and excellent stability are major challenges in the field of renewable energy. Therefore, we developed a simple and effective method to grow ZIF-67 in situ on graphitic carbon nitride (GCN) and then annealed it to generate nitrogen-doped carbon (NC) loaded with Co@C nanoparticles (Co@C/NC). Benefiting from this in situ growth method, after annealing, a large number of N atoms on the surface of NC nanosheets anchor more metal Co to form more catalytic Co–N active sites. At the same time, the Co@C/NC composites use NC nanosheets as the matrix, which can improve the electrochemical double-layer capacitance and conductivity of the composites. As demonstrated in electrochemical measurements, the OER and HER overpotentials of Co@C/NC composites at a current density of 10 mA cm –2 were only 300 and 175.4 mV in 1.0 M KOH, respectively. The preparation method is suitable for synthesizing various metal and carbon composite electrocatalysts. It provides ideas for designing and manufacturing high-performance non-noble-metal dual-function OER/HER catalysts.
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7دورية أكاديمية
مصطلحات موضوعية: Biochemistry, Microbiology, Evolutionary Biology, Ecology, Chemical Sciences not elsewhere classified, work may provide, volatile organic compound, situ growth approach, efficient catalytic performance, attracted great attention, 4 , 3 , 2 , partial electron transfer, excellent toluene activity, situ grown pt, 3 +, electron transfer effect, boosting toluene combustion, boost toluene degradation, rich pt species, toluene degradation, toluene combustion, rich pt, pt species, emsi effect, term stability, redox ability, prepared via, new idea
الوصف: Electronic metal–support interaction (EMSI) has attracted great attention in volatile organic compound (VOC) abatement. Herein, Pt@Co 3 O 4 catalysts were prepared via a metal–organic framework (MOF) in situ growth approach to boost toluene degradation. The partial electron transfer from Co 3 O 4 to Pt species was induced by the EMSI effect to generate the electron-rich Pt and Co 3+ species. The electrophilic O 2 molecules could be activated by picking up the electrons from electron-rich Pt species to form nucleophilic oxygen species, which is conducive to attack C–H bonds in toluene. The redox ability and surface oxygen species activity of catalysts were improved due to strong EMSI. As expected, the excellent toluene activity was achieved, meanwhile exhibiting satisfactory water resistance and long-term stability for toluene combustion. In situ diffuse reflectance infrared Fourier transform spectroscopy results elucidated that surface lattice oxygen species should deeply participate in toluene degradation, which could be efficiently replenished by gaseous oxygen. This work may provide a new idea for exploring the relationship between the electron transfer effect and efficient catalytic performance of VOCs.
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8دورية أكاديمية
المؤلفون: Jingxian He (8120903), Fang Liu (13271), Chaohu Xiao (8120900), Hanxue Sun (3184587), Jiyan Li (8163363), Zhaoqi Zhu (3184590), Weidong Liang (2919182), An Li (415945)
مصطلحات موضوعية: Molecular Biology, Physiology, Pharmacology, Evolutionary Biology, Ecology, Inorganic Chemistry, Chemical Sciences not elsewhere classified, Physical Sciences not elsewhere classified, various saline solutions, open water area, magnetic field possible, low thermal conductivity, interpenetrating macroporous structure, floating solar generator, facile hydrothermal method, 1 sun irradiation, polymer porous foam, photothermal conversion performance, light absorption layer, 8 %) composed, 4 , 3 , synergistic light, porous substrate, photothermal materials, 92 %), well satisfy, superhydrophilic wettability, situ growth, promising strategies
الوصف: Solar steam generation has been considered as one of the most promising strategies for production of fresh water using renewable solar energy. Herein, we prepared a polymer porous foam (HPSS) by a facile hydrothermal method. The HPSS presents a superhydrophilic wettability, an interpenetrating macroporous structure, and low thermal conductivity, which can well satisfy the criteria as an ideal candidate for photothermal materials. The HPSS/Fe 3 O 4 /PPy (polypyrrole) evaporator, of which a Fe 3 O 4 /PPy binary optical system served as a light absorption layer and HPSS was used as a porous substrate, was constructed through in situ growth of Fe 3 O 4 particles followed by interfacial polymerization of PPy on the surface of HPSS. HPSS/Fe 3 O 4 /PPy shows an excellent light absorption capacity (92%) and photothermal conversion performance, with the solar energy conversion efficiency reaching up to 94.7% under 1 sun irradiation, which is much higher than that of HPSS/PPy (84.8%) composed of a unitary PPy light absorption layer. Interestingly, the presence of Fe 3 O 4 particles could make directional migration in a magnetic field possible, thus facilitating its recovery as a self-floating solar generator in an open water area. Moreover, the HPSS/Fe 3 O 4 /PPy evaporator displays outstanding salt resistance properties and stability in various saline solutions, thus having great potential in practical desalination.
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9دورية أكاديمية
المؤلفون: Peixin Liu (475955), Peng Jing (1272780), Xuan Xu (781842), Baocang Liu (1780762), Jun Zhang (48506)
مصطلحات موضوعية: Biophysics, Biochemistry, Medicine, Biotechnology, Evolutionary Biology, Space Science, Environmental Sciences not elsewhere classified, Biological Sciences not elsewhere classified, Chemical Sciences not elsewhere classified, supporting structure formed, supporting structure could, provided new insight, oxygen vacancies embedded, copper mesh substrate, 83 μg h, 2 v versus, 3 , 2 , reversible hydrogen electrode, efficient electrocatalytic n, electrocatalytic process, − 0, work demonstrated, structural transformation, structural reconstruction, structural characterizations, situ growth, rational design, promising electrocatalysts, promising alternative
الوصف: The electrochemical synthesis of ammonia from N 2 under mild conditions is a promising alternative to the energy-consuming Haber–Bosch process. Metal–organic frameworks (MOFs) are promising electrocatalysts for the N 2 reduction reaction, but most of them are active for the undesirable and competitive hydrogen evolution reaction. Herein, we developed a facile strategy to grow a Ce-MOF on copper mesh substrate. The Ce-MOF with a self-supporting structure could be directly used as an electrode for the N 2 reduction reaction, demonstrating highly efficient electrocatalytic performance with an NH 3 yield of 14.83 μg h –1 cm –2 and a Faradaic efficiency of 10.81% at −0.2 V versus a reversible hydrogen electrode. Structural characterizations of Ce-MOF after electrocatalysis revealed that Ce-MOF as precatalyst underwent structural reconstruction at negative potential, forming catalytically active CeO 2 with oxygen vacancies embedded in the amorphous Ce-MOF. In addition, the self-supporting structure formed by in situ growth of Ce-MOF on porous and conductive cooper mesh endowed the electrocatalyst with enhanced stability, conductivity, and mass transport. This work demonstrated the structural transformation of Ce-MOF during the electrocatalytic process and provided new insight for the rational design of MOF-based electrocatalysts.
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10دورية أكاديمية
المؤلفون: Lu Yao (444605), Zhibin Geng (1552825), Wei Zhang (405), Xiaofeng Wu (288608), Jinghai Liu (1552819), Liping Li (120326), Xiyang Wang (4450660), Xiangyan Hou (9175611), Ke Xu (134879), Keke Huang (703621), Shouhua Feng (1415449)
مصطلحات موضوعية: Biotechnology, Evolutionary Biology, Developmental Biology, Infectious Diseases, Space Science, Chemical Sciences not elsewhere classified, oxygen evolution reaction, hydroxide materials, Spinel NiFe 2 O 4, material exhibits, ultrasonic-assisted reduction method, Situ Growth, multistep synthesis process, 276 mV, Fe cations, reduction effect, Ultrasonic-Assisted Reduction, electrochemical performance, NiFe 2 O 4, crystal surface, OER, Amorphous NiFe Hydroxides
الوصف: Amorphous Ni–Fe hydroxides (NiFe(OH) x ) are considered to possess promising potential as oxygen evolution reaction (OER) electrocatalysts, but amorphous NiFe(OH) x is hard to synthesize due to the complicated multistep synthesis process. Herein, amorphous NiFe(OH) x is successfully grown in situ on the surface of NiFe 2 O 4 via an ultrasonic-assisted reduction method. This method takes advantage of ultrasonic cavitation to achieve a unique reduction effect, migration of Ni and Fe cations of NiFe 2 O 4 to the crystal surface, and in situ growth of amorphous NiFe(OH) x , thereby forming a NiFe 2 O 4 /NiFe(OH) x composite. This material exhibits enhanced electrochemical performance with an overpotential of 276 mV at 10 mA cm –2 . The ultrasonic-assisted reduction method can be used to synthesize amorphous NiFe(OH) x with no residual reactants, providing a simple and facile way to synthesize amorphous hydroxide materials.
