APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Rui Cai,Ping-an Yang,Haibo Ruan,Xin Huang,Zhihao Zhou,Qiao Chen,Yuxin Zhang,Xinglong Gong,Yingang Gui,Rui Li
How to prepare materials according to the target properties has been a hot research topic. In this paper, the target electromagnetic parameters are obtained according to the performance requirements, and the nanoflower rod-like, low-density mulberry-like and high-density mulberry-like one-dimensional (1D) core–shell structured Fe@Ni ( x ) nanowires (NWs) are prepared by liquid-phase reduction method. The effective absorption bandwidth (EAB) of sample Fe@Ni (40) in the low-frequency (2–8 GHz) is up to 1.89 GHz (3.1 mm). Sample Fe@Ni (60) is able to reach a maximum EAB of 3.18 GHz at a thickness of 0.9 mm. Concisely, the sample has the ability to absorb microwaves in low frequency bands and ultra-thin thicknesses. The reason can be attributed to the strong magnetic coupling brought by the bimetallic composition to strengthen the resonance level and the excellent 1D core–shell structure to enhance the efficiency of polarization loss. In conclusion, Fe@Ni ( x ) provides a technological route for the preparation of low-frequency and ultra-thin-thickness absorbers.
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Materials
·
2025
·Vol. 18
·期 5
·969
·
IF 3.2
Shipeng Chen,Jinglan Xu,Dingchuan Huang,Weiwei Zhang,Tian Zhang,Liangliang Xiong,Xiaoqiang Fan
The Ni-Au coating with its inherent chemical stability is recognized as an effective method for boosting corrosion resistance in humid environments while preserving exceptional electrical conductivity. However, its anti-corrosion performance is affected by the structure characteristics of the coating due to the high corrosion potentials of Au and Ni. To enhance its protection properties, the deposition process parameters, including deposition time, deposition current density, and zincating times, were investigated. The morphology and structure of the coatings were characterized, while its anti-corrosion performance was assessed through electrochemical and accelerated salt-spray tests. Eventually, the elevated current density in the Ni-Au coating resulted in reduced grain size and improved surface morphology, ensuring superior anti-corrosion performance. Additionally, extending the Ni deposition time provided a second physical barrier for the dense and thick Ni layer to resist the invasion of corrosive media. Furthermore, grey theory was applied to predict the service life of the Ni-Au coating. This research provides valuable insights and constructive guidance for optimizing Ni-Au coating in various engineering applications.
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高影响因子
KINETICS AND CATALYSIS
·
2024
·Vol. 65
·期 3
·251-260
·
IF 1.3
Yang Zhi,Luo Mingsheng,Liu Qinglong,Li Chenmeng,Wang Yatao,Li Hongjuan,Yao Lifei
Abstract The direct production of higher alcohols from syngas in a single step remains a great challenge. In this work, a series of K and Ni promoted Mo 2 C/Al 2 O 3 catalysts were prepared by impregnation method to enhance the selectivity of Mo 2 C-based catalysts for the one-step conversion of syngas to higher alcohols. The catalysts were continuously tested under the following conditions: 300°C, 3.0 MPa, velocity—11.50 \({\text{Lg}}_{{{\text{Mo}}}}^{{ - 1}}\) h –1 , H 2 /CO ratio of 2. The catalysts promoted with K and Ni demonstrated the highest total alcohol selectivity of 67.7%. Moreover, the selectivity for total C 2+ alcohols reached as high as 56%, with 37% being ethanol. X-ray diffraction (XRD), hydrogen temperature-programmed reduction (H 2 -TPR) and X-ray photoelectron spectroscopy (XPS) characterization data reveal that K can promote the crystallinity of β-Mo 2 C, lower the catalyst reduction temperature and increase the proportion of high-valent Mo on the catalyst surface. In addition, adding Ni as a promoter to the KMo 2 C/Al 2 O 3 catalyst can generate a synergistic effect to further enhance the catalytic activity and the selectivity of higher alcohols.
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Surfaces and Interfaces
·
2024
·
IF 5.7
Kuang He,Kaixuan Zheng,Li Wang,Kaihua Huang,Yong Wen,Yu Wang,Ning Hu,Jianwei Du,Lyumeng Ye,Lin Cheng
This study explores an innovative electrochemical strategy for the removal of the highly stable and toxic EDTA-Ni complex found in electroplating wastewater. Utilizing a cobalt-based single-atom catalyst (Co-NC) in an electro-enhanced system, we achieved significant activation of peroxydisulfate (PDS) for effective degradation of EDTA-Ni. Under optimal conditions of 40 mA current density and a pH range of 3–7, more than 97% of EDTA-Ni (1 mM) was successfully degraded within 90 min. Through detailed electrochemical experiments, we identified that atomic hydrogen (H*) played a crucial role in the indirect activation of PDS, facilitating the formation of reactive sulfate radicals (·SO4-). Computational analysis using density functional theory (DFT) confirmed that the H*-mediated reduction pathway had a notably low energy barrier (ΔGbs = 0.51 eV), making it the dominant activation mechanism. Gas chromatography-mass spectrometry (GC–MS) further revealed the primary degradation intermediates, providing insights into the breakdown process of EDTA-Ni. This research underscores the potential of Co-NC catalyst as a highly effective catalyst for treating persistent heavy metal complexes in advanced oxidation systems.
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Heliyon
·
2024
·
IF 3.4
Yige Yan,Mohan Huang,Yongsheng Wang,Dawei He,Jiaqi He
Metal-organic frameworks (MOF) have been wildly synthesised and studied as electrode materials for supercapacitors, and bimetallic MOF of Ni and Co has been broadly studied to enhance both specific capacitance and stability of supercapacitors. Herein, a best performance (about 320 F/g) of Ni–Co bimetallic MOF was found in a uniform preparation condition by adjusting the ratio of Ni to Co. Then tiny third metal ion was introduced, and we found that the morphology of material has a significant change on the original basis. Furthermore, certain ions (Zn, Fe, Mn) introduced make a huge improvement in capacitance based on Ni–Co MOF of 320 F/g. The result shows that Zn–Ni–Co MOF, Fe–Ni–Co MOF and Mn–Ni–Co MOF perform specific capacitance of 1135 F/g, 870 F/g and 760F/g at 1 A/g, respectively. Meanwhile, the asymmetric supercapacitor (ASC) was constructed by Zn–Ni–Co MOF as positive electrode and active carbon (AC) as negative electrode. The Zn–Ni–Co MOF//AC ASC possesses a energy density of 58 Wh/kg at a power density of 775 W/kg. This research provides a new methods to regulate the morphology of MOF and a novel viewpoint for assembling high-performance, low-price, and eco-friendly green energy storage devices.
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Wenlong Zhang,Chenzheng Liao,Xiaohui Ning
Based on the high safety and low costs, molten salt batteries (Na-S battery, liquid metal battery, ZEBRA battery, etc.) have received more and more attention as large-scale electrical storage technology. However, the high operating temperature of molten salt batteries is still one of the roadblocks that impeded their practical application. Here we present the novel Ni-graphite molten salt battery based on outstanding electrochemical reversibility of the Ni/NiCl 2 redox and intercalation/de-intercalation chemistry of chloroaluminate anions in graphite. By using the low-cost, quaternary inorganic molten salt AlCl 3 /KCl/NaCl/LiCl as electrolyte, the as-designed Ni-graphite battery possesses low operating temperature of 95 °C, and average voltage about 1.7 V. The Ni-graphite battery delivers stable specific capacity of 174 mAh/g at 500 mA/g after 120 cycles, with the capacity retention rate of 98%. In addition, the Ni-graphite battery also shows low material costs about 113.6 $/kWh and high electrode energy density of 289 Wh/kg. This work develops an advanced molten salt battery with low operating temperature and high energy density, as well as provides an alternative means of developing future large-scale power storage equipment based on molten salt batteries.
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JOURNAL OF ETHNOPHARMACOLOGY
·
2024
·
IF 4.8
Anhui Wang,Xue Yang,Jiachun Lin,Yali Wang,Jinni Yang,Yuting Zhang,Yuan Tian,Haijuan Dong,Zunjian Zhang,Rui Song
Ethnopharmacological relevance Si-Ni-San (SNS), a traditional Chinese medicinal formula derived from Treatise on Febrile Diseases , is considered effective in the treatment of inflammatory bowel diseases based upon thousands of years of clinical practice. However, the bioactive ingredients and underlying mechanisms are still unclear and need further investigation. Aim of the study This study aimed to evaluate the effect, explore the bioactive ingredients and the underlying mechanisms of SNS in ameliorating ulcerative colitis (UC) and associated liver injury in dextran sodium sulphate (DSS)-induced mouse colitis models. Materials and methods The effect of SNS (1.5, 3, 6 g/kg) on 3% DSS-induced acute murine colitis was evaluated by disease activity index (DAI), colon length, inflammatory cytokines, hematoxylin-eosin (H&E) staining, tight junction proteins expression, ALT, AST, and oxidative stress indicators. HPLC-ESI-IT/TOF MS was used to analyze the chemical components of SNS and the main xenobiotics in the colon of UC mice after oral administration of SNS. Network pharmacological study was then conducted based on the main xenobiotics. Flow cytometry and immunohistochemistry techniques were used to demonstrate the inhibitory effect of SNS on Th17 cells differentiation and the amelioration of Th17/Treg cell imbalance. LC-MS/MS, Real-time quantitative polymerase chain reaction (RT-qPCR), and western blotting techniques were performed to investigate the oxysterol-Liver X receptor (LXRs) signaling activity in colon. Targeted bile acids metabolomics was conducted to reveal the change of the two major pathways of bile acid synthesis in the liver, and the expression of key metabolic enzymes of bile acids synthesis was characterized by RT-qPCR and western blotting techniques. Results SNS (1.5, 3, 6 g/kg) decreased the DAI scores, protected intestinal mucosa barrier, suppressed the production of pro-inflammatory cytokines, improved hepatic and splenic enlargement and alleviated liver injury in a dose-dependent manner. A total of 22 components were identified in the colon of SNS (6 g/kg) treated colitis mice, and the top 10 components ranked by relative content were regarded as the potential effective chemical components of SNS, and used to conduct network pharmacology research. The efficacy of SNS was mediated by a reduction of Th17 cell differentiation, restoration of Th17/Treg cell homeostasis in the colon and spleen, and the experimental results were consistent with our hypothesis and the biological mechanism predicted by network pharmacology. Mechanistically, SNS regulated the concentration of 25-OHC and 27-OHC by up-regulated CH25H, CYP27A1 protein expression in colon, thus affected the expression and activity of LXR, ultimately impacted Th17 differentiation and Th17/Treg balance. It was also found that SNS repressed the increase of hepatic cholesterol and reversed the shift of BA synthesis to the acidic pathway in UC mice, which decreased the proportion of non-12-OH BAs in total bile acids (TBAs) and further ameliorated colitis and concomitant liver injury. Conclusions This study set the stage for considering SNS as a multi-organ benefited anti-colitis prescription based on the significant effect of ameliorating intestinal and liver damage, and revealed that derivatives of cholesterol, namely oxysterols and bile acids, were closely involved in the mechanism of SNS anti-colitis effect.
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高影响因子
FUEL
·
2025
·
IF 7.5
Ze Xiao,Jiaxuan Zang,Wenhua Feng,Qingwei Meng,Tiejun Wang
Aqueous phase reforming of methanol (APRM) for on-site hydrogen production is a very promising energy alternative, but the lack of high-efficiency catalysts hinders its rapid improvement. Herein, we have prepared layered double hydroxide derived metal-base bifunctional Ni catalysts that exhibit excellent catalytic performance in APRM. The hydrogen production rate and turnover frequency of the optimal catalyst Ni 2 Mg 1 -MMO-1 are 285.2 μmol H2 /g cat. /s and 2094 h −1 at 240 °C, respectively, exceeding the best result reported so far for Ni-based catalysts. Characterization results reveal that the more Ni 0 and base sites present on the catalyst surface, the better performance tends to be achieved. The reaction mechanism is investigated by TPSR and in situ DRIFTS techniques. A possible pathway, methanol dehydrogenation and water–gas shift (WGS), is proposed. Notably, the WGS stage undergoes an associative mechanism, where water is efficiently activated at base sites and bonds with CO adsorbed on Ni 0 sites to form formate, which is the key to enhancing hydrogen production in APRM.
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高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2024
·
IF 2.2
Chen Yang,Ma Haihong,Ren Fengmei,Zhou Zhengfa,Xu Weibing
With the increasing shortage of energy reserves, the exploration of new energy sources is a growing area of research. As a widely used energy storage device, supercapacitors have attracted widespread attention from researchers. In our study, N- and B-modified phenolic foam was prepared by polymerization using phenol and paraformaldehyde as raw materials, urea and 4-formylphenylboronic acid as modifiers of nitrogen and boron, respectively, and adding foaming agent and curing agent. Modified reduced graphene oxide was synthesized by modifying reduced graphene oxide with nickel and cobalt. Finally, modified reduced graphene oxide-doped phenolic resin-based carbon foams were prepared by mixing and carbonizing the above two modified materials. The effects of mass ratio of Ni to Co, carbonization temperature, and different addition amount of activator on the structure and electrochemical properties of the obtained carbon foam materials were studied. The results show that the specific surface area of the carbonized material can reach 744 m 2 /g and the pore volume of the material is 0.496 cm 3 /g when the mass ratio of Ni metal to Co metal salt is 1:1, the mass ratio of activator to modified phenolic foam is 5, and the carbonization temperature is 800°C. And its maximum specific capacitance can reach 1288 F/g at a current density of 1 A/g. When the current density is increased to 10 A/g, its specific capacitance is still maintained at 700 F/g. The electrode has a 65% capacitance retention rate after 1000 cycles. The preparation of carbon foam electrode materials based on phenolic resin provides a theoretical basis for the development of energy storage containers with low cost and high performance.
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高影响因子
DALTON TRANSACTIONS
·
2024
·Vol. 53
·期 10
·4823-4832
·
IF 3.5
Haihui Hu,Ke Ma,Yuandong Yang,Na Jin,Linjie Zhang,Jinjie Qian,Lili Han
Hydrogen peroxide (H2O2) electrosynthesis via the two-electron oxygen reduction reaction (2e− ORR) represents a green alternative to the energy-intensive anthraquinone process. However, the practical application of this method is limited by the lack of cost-effective and high-performance electrocatalysts. Reported here is a hybrid catalyst composed of nickel (Ni) clusters immobilized onto the surface of two-dimensional siloxene nanosheets (Ni/siloxene), which exhibits excellent efficiency and selectivity in electrocatalytic oxygen reduction to H2O2 in an alkaline medium, demonstrating a standard 2e− pathway with >95% H2O2 selectivity across a wide potential range. Experimental results disclose that the high performance of Ni/siloxene can be traced to a synergy of the Ni clusters and the oxygen-rich surface of siloxene. Density functional theory (DFT) calculations further reveal a weakened interaction between Ni/siloxene and *OOH and the consequently reduced energy barrier for the *OOH protonation toward H2O2 desorption, thus leading to a high 2e− ORR reactivity and selectivity. This work provides a valuable and practical guidance for designing high-performance 2e− ORR electrocatalysts based on the rational engineering of the metal–support interaction.
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高影响因子
Small
·
2024
·
IF 13
Wentao Qu,Jian Zhu,Guozhong Cao,Shulin Chen,Yongwen Tan,Baohui Chen,Ming Zhang
Zinc-iodine batteries (Zn-I2) are extremely attractive as the safe and cost-effective scalable energy storage system in the stationary applications. However, the inefficient redox kinetics and “shuttling effect” of iodine species result in unsatisfactory energy efficiency and short cycle life, hindering their commercialization. In this work, Ni single atoms highly dispersed on carbon fibers is designed and synthesized as iodine anchoring sites and dual catalysts for Zn-I2 batteries, and successfully inhibit the iodine species shuttling and boost dual reaction kinetics. Theoretical calculations indicate that the reinforced d-p orbital hybridization and charge interaction between Ni single-atoms and iodine species effectively enhance the confinement of iodine species. Ni single-atoms also accelerate the iodine conversion reactions with tailored bonding structure of I─I bonds and reduced energy barrier for the dual conversion of iodine species. Consequently, the high-rate performance (180 mAh g −1 at 3 A g −1 ), cycling stability (capacity retention of 74% after 5900 cycles) and high energy efficiency (90% at 3 A g −1 ) are achieved. The work provides an effective strategy for the development of iodine hosts with high catalytic activity for Zn-I2 batteries.
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高影响因子
Nano Research
·
2024
·
IF 9.5
Li Jing,Jing Chuanyong,Wang Jin
Electrocatalytic CO 2 reduction to CH 4 remains challenging due to multi-electron transfer and intermediates adsorption. Herein, we synthesized electrocatalysts by growing Ni-Cu alloy structure on nitrogen-doped carbon nanotubes (Ni x Cu y -NCNT) for electrocatalytic CO 2 reduction reaction (CO 2 RR) via hydrothermal method followed by pyrolysis. The optimized Ni 1 Cu 1 -NCNT demonstrated a superior CO 2 RR performance, achieving 99.7% \(\text{FE}_{\text{CH}_{4}}\) (FE = Faradaic efficiency) and 11.54 mA • cm −2 current density at −1.2 V vs. reversible hydrogen electrode (RHE), which outperformed single metal counterparts. Its outstanding performance was due to the electrons transferred from Cu to Ni and Ni-Cu alloy shifted the d-band center toward the Fermi level, which was more conducive to the intermediate formation. In situ electrochemical attenuated total reflection (EC-ATR) and density functional theory (DFT) calculations revealed the appearance of *CHO intermediate and the pathway during the CO 2 RR process. The design of the bimetallic electrocatalyst in this study provides a new perspective for the highly selective reduction of CO 2 .
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