JOURNAL OF POWER SOURCES
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2024
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IF 8.1
Shihang Guo,Lin Wang,Chenyang Xue,Sumei Lin,Tingxuan Yi,Yuwen Zhu,Donglin Han
Protonic ceramic cells (PCCs) can convert the energy between electricity and fuels efficiently, and are attracting increasing attention. However, the development of PCCs is restricted by the lack of proper positrode materials. In this work, we report a Co-free system with a nominal composition of BaCe 0.2 Fe 0.8 O 3-δ , which is composed of a Fe-rich matrix phase decorated with Ce-rich nanoparticles. The performance of such a dual-phase positrode system is further improved by doping Zn and/or Ni to increase bulk and surficial concentration of oxygen vacancies. The hydration reaction and surficial adsorption of oxygen species are thereby promoted, benefitting the oxygen reduction reaction. The Ni and Zn co-doped composition Ba(Ce 0.2 Fe 0.8 ) 0.85 (Ni 0.5 Zn 0.5 ) 0.15 O 3-δ exhibits lower polarization resistance than the pristine and singly doped systems, enabling the fuel cells to show high peak power densities of 400, 721, and 828 mW cm −2 at 550, 600, and 650 °C, respectively.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Shuangfu Gang,Yongxin Qian,Tianshun Xiong,You Li,Wang Li,Zheng Ma,Wenguang Zhang,Hui Long,Yingchao Wei,Xin Li,Qinghui Jiang,Yubo Luo,Junyou Yang
All-scale hierarchical defects induced by structural designing from unit cell to mesoscale play a significant role in oscillating and dissipating electromagnetic wave energy under external microwave radiation. To construct such all-scale hierarchical defects, hereby, high-entropy alloy nanoparticles coated by microscale carbon (HEA@C) with a core–shell structure were obtained by carbonizing Ni-Mn-Co-Cu-Al metal–organic. Thus, all-scale hierarchical defects were gained, including lattice distortion and nanotwins caused by the high entropy effect, vacancy and topological defects within carbon, and the heterojunction between high entropy nanoparticles and carbon. These all-scale hierarchical defects combined with the magnetic and conductive nature of HEA@C enable us to achieve a high electromagnetic wave absorption performance, with a reflection loss (RL min ) value of −52.36 dB and an effective absorption bandwidth (EAB) of 5.01 GHz. It implies that HEA@C should be an effective electromagnetic wave (EMW) absorber.
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Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Junlin Zhu,Zhaotian Ba,Yuanmeng Lou,Cui Li,Lili Ma,Jie Liu,Xin Wen,Tao Tang
To effectively mitigate the environmental and ecological impacts stemming from polymer wastes, the development of innovative recycling and reusing strategies is of utmost importance. In response to the call of “Waste-to-Wealth”, this study presents a green and efficient method to convert waste polypropylene (waste protective cloths, WPC) into Ni@CNTs hybrids via catalytic carbonization. Subsequently, these Ni@CNTs hybrids are directly applied as functional nanofillers to prepare fire resistant polycarbonate (PC) composites. The experimental results demonstrated that the combined catalysts composed of NiCl 2 /Ni(C 5 H 7 O 2 ) 2 were efficient in catalyzing WPC into Ni@ CNTs hybrids, achieving the yield was as high as 58.6 g/100 g WPC. Leveraging the superior characteristics of Ni@CNTs hybrids, they were used as a fire retardant of polycarbonate (PC) matrix to fabricate PC/Ni@CNTs composites. The PC/3Ni@CNTs exhibited excellent fire retardancy, as evidenced by the limited oxygen index (LOI) of 30.5 %, the V 0 rating in UL-94 vertical burning test, and the 64.1 % reduction in the peak of heat release rate (PHRR) in cone calorimeter test. Meanwhile, it displayed low toxicity with 75.0 % reduction in the peak of CO production (COP). The mechanism was attributed to the synergistic effects of Ni and CNTs, which combine the catalyzing carbonization and the enhanced char layer together in condensed phase. Thus, this study provides a green and sustainable strategy for the conversion of polymer wastes into high-valuable carbon/metal hybrids, and exploits their advanced application in the fabrication of fire-resistant polymer composites.
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TRIBOLOGY INTERNATIONAL
·
2024
·
IF 6.1
Xingtao Cheng,Yi He,Siming Yan,Liping Yan,Zhiyuan Li,Shijun Xu,Kaijun Wei,Yi Fan,Quangang Chen,Wanwan Peng
Wear and erosion are common issues encountered when applying metal components in harsh marine environments. In this study, N-MX@ZnO materials were prepared by a synergistic modification of Ti 3 C 2 T x using ethylenediamine and zinc oxide quantum dots. Subsequently, the Ni-Cu/N-MX@ZnO coating was deposited onto J55 steel using pulsed electrodeposition, exhibiting excellent tribological properties. The toughness, wear, and seawater erosion behavior of the coatings were investigated. The results demonstrated that the COF value of the Ni-Cu/N-MX@ZnO coating was reduced by 48.23% and the impedance value was increased by 300% in comparison to the pure sample. The enhancement mechanism can be attributed to the physical barrier effect and uniform dispersion effect of N-MX@ZnO, which caused the Ni-Cu/N-MX@ZnO coatings to form a friction-transferring film during the friction process.
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CHEMICAL PHYSICS
·
2025
·
IF 2.4
Zexuan Wang,Sen Lei,Chenge Liu,Ling Zhang,Xin Ma,Mingyang Gao,Qiang Li,Cheng Chen,Wu Zhao
In recent years, electromagnetic pollution has become a growing concern, and electromagnetic wave absorption materials are increasingly used to mitigate its effects. This study presents a biomass cotton/nickel MOFs-derived Ni@ nanoporous carbon@ carbon fiber (Ni@ NPC@ CF) composite material, prepared using hydrothermal and thermal decomposition methods. Microscopic observations reveal a uniform distribution of Ni@ NPC@ CF on the carbon fiber matrix. The composite exhibits multiple electromagnetic wave loss mechanisms: magnetic loss from nano‑nickel particles and electrical loss from nanoporous carbon and carbon fibers. With only a 20 % filling ratio and a thickness of 2.75 mm, the material achieves an RL min of −67 dB and an effective absorption bandwidth (EAB) of 7.23 GHz (RL < -10 dB). This study offers a practical solution for utilizing biomass as a high-performance, cost-effective, eco-friendly, and renewable carbon-based absorbent material, providing valuable insights for developing electromagnetic wave absorbing composites.
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Analytical Methods
·
2025
·
IF 2.6
Xinxing Jiang,Jihong Fu,Shuxian Ren,WenXia Xue
Substrate materials with high sensitivity and good reproducibility are highly desirable for the practical applications of surface-enhanced Raman scattering (SERS) techniques. In this study, a novel Ni-based metal-organic frameworks loaded gold nanoparticles (Ni-BDC-NH2/Au NPs) SERS substrate was successfully synthesized via electrostatic self-assembly method. The enhancement of the SERS signal is achieved owing to the synergy between chemical enhancement (CM) effect of Ni-BDC-NH2 and the electromagnetic enhancement (EM) of Au NPs, and the enriching of the analyte near the SERS “hot spots” through the strong adsorption capacity of the Ni-BDC-NH2. The Ni-BDC-NH2/Au NPs exhibited a high enhancement factor (EF) of 1.10×107 and a low detection limit of 5×10-9 mol/L. Besides, the substrate material showed exceptional stability up to 45 days at room temperature. The Ni-BDC-NH2/Au NPs was used to detect methylene blue (MB) that displayed a wide linearity (5×10-7-5×10-5 mol/L) and high recoveries (86.82-104.46%). These indicate that the Ni-BDC-NH2/Au NPs hybrid substrate has great potential for the detection of environmental pollution in practical applications.
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PubMed
高影响因子
BIOORGANIC CHEMISTRY
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2024
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IF 4.5
Haitao Zhu,Houcong Li,Yuxin Ji,Min Hou,Qingling Yang,Lili Liang,Wenge Li
A non-platinum-metal decanuclear complex [Ni 10 L 4 (CH 3 COO) 8 (C 2 H 5 OH) 8 ]·8(C 2 H 5 OH) ( Ni 10 complex) has been developed with a tri-dentate 2,3-dihydroxybenzaldehyde-2-aminophenol Schiff base ligand (H 3 L). Single crystal X-ray analysis reveals that the Ni 10 complex displays a sandwich loaf-shaped decanuclear structure and its anticancer activity was evaluated. The cell cytotoxicity results indicating that the Ni 10 complex is most effective to human breast cancer cells MDA-MB-231 and its mechanism were further investigated. Flow cytometry analysis showed that the Ni 10 complex triggered cell cycle arrest and induced apoptosis of MDA-MB-231 cells. Western blot analysis of the changes of intracellular protein expression showed that Ni 10 triggers MDA-MB-231 apoptosis through mitochondrial mediated apoptosis signaling pathways. In vivo experiments showed that the Ni 10 complex significantly suppressed breast tumor growth with low toxicity against major organs in a nude mice model. The good treatment effect, low toxicity and pharmacological mechanisms of the decanuclear Ni II complex may provide a clue for the research and development of non-platinum multinuclear based chemotherapeutic drugs.
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PubMed
高影响因子
Materials Today Communications
·
2025
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IF 4.5
Taoyi Shi,Xiufang Cui,Guo Jin,Wei Zheng,Jin Liu,Xin Wen,Kaixuan Zhou
To address the problem that a high-content lubricating phase can decrease the hardness and wear resistance, resulting in the spallation of the coating during the friction process. In this study, spherical composite powders of NiCrAl-Bentonite, NiCrAl-Bentonite doped with 3 wt% carbon fiber (NiCrAl-3CF), and NiCrAl-Bentonite doped with 3 wt% nickel-coated carbon fiber (NiCrAl-3NCF) were fabricated using ball milling and spray granulation. Subsequently, these composite powders were utilized to prepare corresponding coatings on SUS321 substrates. The hardness and wear test indicated that the doping of carbon fiber (C f ) and nickel-coated carbon fiber (Ni@C f ) increased the hardness and diminished the abrasive wear and damage to the grinding ball during the wear test, thereby reducing the Coefficient of Friction (COF). The electrochemical test indicated that the connection and bridging effects of C f and Ni@C f within the coating changed the corrosion direction and prolonged the corrosion path, thereby improving the corrosion resistance. This study clarifies the mechanism of C f and Ni@C f on tribological performance and corrosion resistance of the coating, it holds considerable reference value for their application in thermal spraying lubricating coating.
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NEW JOURNAL OF CHEMISTRY
·
2024
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IF 2.7
Shangzhen Feng,Hantao Zhou,Zhongze Wang,Sihao Shu,Xing Zhang,Jixiang Chen
Herein, the Ni-Co alloy embedded in mesoporous carbon hollow spheres (MCHS) catalysts were prepared by the one-pot Stöber method using SiO2 as hard template and resorcinol-formaldehyde resin (RF) as carbon source, and they were tested for in-situ aqueous phase hydrodeoxygenation of methyl palmitate to hydrocarbons using methanol as hydrogen donor. The formation of the catalyst precursors involves nucleation, growth and co-assembly of RF and SiO2. The introduction of SiO2 can construct the mesoporous and hollow structure and improve the specific surface area. It also reduces the micropore volume due to the reduced graphitization degeree of the catalysts induced by SiO2. Thus, the internal diffusion resistance is decreased. Particularly, the Ni-Co alloy particles formed during the carbonization are embedded in the mesoporous carbon layer, effectively hindering their sintering and leaching under the harsh hydrothermal condition. Moreover, the metal sites can be exposed on both mesoporous channels and inner/outer surfaces of the carbon hollow spheres, making the reactants easily accessible. In the in-situ hydrodeoxygenation of methyl palmitate, the as-prepared catalyst gives the pentadecane yield of 89.0% at 310 °C for 1 hour. It is notably that the facile diffusion in MCHS suppresses the undesired C-C bond hydrogenolysis. The catalyst is not obviously deactivated during five reactions.
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Advanced Composites and Hybrid Materials
·
2024
·Vol. 7
·期 6
·1-14
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IF 23.2
Qiu Jiahang,Zhang Mu,Zhao Rongzhi,Sun Xudong,He Dianning
The quest for broadband electromagnetic wave absorption to satisfy the demands of various fields has emerged as a prominent research focus in the domain of electromagnetic wave absorption. By considering the effects of magnetic loss and polarization loss across different frequency bands, the development of composite materials incorporating magnetic metal particles and single metal atoms may facilitate an expansion of the electromagnetic wave absorption frequency range. Consequently, we synthesized FeCo@C/Ni@C composites derived from FeCo Prussian blue analogues and polydopamine through wet chemistry and pyrolysis methods. The chelation mechanism of polydopamine, combined with the physical barrier effect provided by Zn ions during synthesis, endows the FeCo@C/Ni@C composite with low-frequency magnetic loss characteristics from the FeCo alloy, high-frequency dipole polarization losses attributed to Ni atoms, and conductivity losses arising from the coupled carbon matrix. Ultimately, the composite exhibits exceptional electromagnetic wave absorption performance: at a thickness of 2.26 mm, it achieves a minimum reflection loss value of − 50.1 dB along with an effective absorption bandwidth reaching up to 6.0 GHz. In summary, this work presents a novel strategy for enhancing broadband absorption capabilities in electromagnetic wave absorbing materials.
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NEW JOURNAL OF CHEMISTRY
·
2024
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IF 2.7
Lu Wang,Muyang Shi,Dong Zhang
In order to solve the problem of low energy density of previous cement-based supercapacitors, the capacitor performance was optimized in four aspects: positive electrode performance, positive and negative capacity matching, and electrolyte performance. The effects of electrodeposition solution ratio and scan rate on the electrochemical properties of nickel–cobalt double hydroxide were investigated. The microscopic morphology and elements of nickel–cobalt double hydroxide were analyzed by scanning electron microscopy (SEM), Fourier transform infrared (FTIR), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). The optimized nickel–cobalt double hydroxide electrode demonstrates an excellent areal capacitance of 10.53 F cm−2 and excellent cycling stability (106% capacitance retention after 10 000 cycles) at a current density of 1 mA cm−2. In this paper, an electrode made of activated carbon was used as the negative electrode and the loading of activated carbon was strictly controlled to better match the high specific capacitance of the nickel–cobalt double hydroxide electrode. An optimally proportioned cementitious-polymer electrolyte was selected as the electrolyte for the supercapacitor. The three-step optimized supercapacitor exhibits a high areal capacitance of 1.442 F cm−2, good cycle retention (69.4%), and a remarkable energy density of 0.444 mW h cm−2 (0.75 mW cm−2). This paper is expected to provide a new way to mitigate the issue of “curtailed light” and to construct large-scale buildings integrating light, electricity, and energy storage.
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ADVANCED FUNCTIONAL MATERIALS
·
2024
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IF 18.5
Shuo Wang,Yong Yan,Yongping Du,Yuguo Zhao,Tongxian Li,Dong Wang,Peter Schaaf,Xiayan Wang
Recently, Ni-based chalcogenides havedemonstrated remarkable activity and selectivity for alcohol electrooxidation, but the mechanisms remain debated. This study synthesizes Ni-based electrodeswith different chalcogen anion coordination on nickel nanorod arrays (NiO x /Ni,NiS x /Ni, and NiSe x /Ni NRAs). NiSe x /Ni NRAsshowcases superior performance (Faradaic efficiency 92.9%) in glycerolelectrooxidation reaction (GOR). In situ spectroscopy reveals that NiSecoordination inhibits deep oxidative reconstruction of the Ni-based interface, preventingNiOOH phase formation during GOR, enhancing activity and stability of NiSe x /NiNRAs. Conversely, NiS and NiO coordination lead to deep reconstruction with NiOOHphase formation, limiting GOR performance. Differently, during competingreaction of GOR, the oxygen evolution reaction (OER) leads to deepreconstruction of NiSex interface due to the instability of Ni-Sebonds, inducing performance degradation and dissolution of Se components. Furthermechanism investigation elucidates that the rate-determining step (RDS) ofGOR at the NiSe x interface involves oxidation of *C 2 H 3 O 3 intermediatesthrough H 2 O adsorption, favoring stable formate production.Contrarily, the RDS at the NiS x , NiO x , and NiOOHinterfaces predominantly focus on the decarboxylation of multi-carbon intermediates, raisingenergy barriers and over-oxidizing formate to CO 2 . These results providenew insights for designing Ni-based non-oxide catalysts forefficient and stable electrocatalytic oxidation.
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