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
Greenhouse Gases-Science and Technology
·
2025
·
IF 2.8
Qihang Wen,Yifei Feng,Haoyuan Gu,Haitao Yan,Zixu Yang,Minghui Zhu,Jing Xu
The performance of bimetallic catalysts is closely related to their surface structure, and the surface reconstruction process can affect the distribution of active sites, electronic structure, and reactant adsorption behavior. Traditional research has mostly focused on optimizing synthesis processes, such as controlling the size and distribution of metal particles, whereas there is relatively little research on the effect of pretreatment conditions on the dynamic structure of catalysts. In this study, a 10Ni─1Cu catalyst was synthesized using the deposition–precipitation method, and the effects of different pretreatment conditions on its performance were investigated. The catalyst was first pretreated at 500°C in a 60%H 2 /40%N 2 atmosphere, followed by reduction under different pretreatment atmospheres (10%H 2 /90%N 2 or 15%CO 2 /60%H 2 /25%N 2 ) at the same temperature. At 400°C and a space velocity of 30 L h −1 g −1 , the methane production rate of the catalyst treated in the reaction atmosphere significantly increased from 12.4 to 15.8 µmol g −1 s −1 compared to the catalyst treated with hydrogen alone. Characterization techniques, such as TEM, x-ray photoelectron spectroscopy (XPS), and diffuse reflectance infrared Fourier transform spectroscopy (CO-DRIFTS), were employed to study the structural properties of the catalysts, focusing on the surface properties after reduction and the surface species during the reaction. This study demonstrates that catalysts pretreated in the reaction atmosphere enhance methane production rates by regulating the surface structure and forming Ni─Cu alloy structures with a lower Ni/Cu ratio, thereby optimizing the selectivity of hydrogenation products.
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Toxics
·
2024
·Vol. 12
·期 11
·816
·
IF 3.9
Qi Zhang,Mingling Yu,Hang Liu,Jin Tang,Xiaolong Yu,Haochuan Wu,Ling Jin,Jianteng Sun
In this work, NiCo2O4was synthesized from bimetallic oxalate and utilized as a heterogeneous catalyst to active peroxymonosulfate (PMS) for the degradation of tetracycline (TC). The degradation efficiency of TC (30 mg/L) in the NiCo2O4+ PMS system reached 92.4%, with NiCo2O4exhibiting satisfactory reusability, stability, and applicability. Radical trapping test and electron paramagnetic resonance (EPR) results indicated that SO4•−, •OH, O2•−, and1O2were the dominating reactive oxygen species (ROS) for TC degradation in the NiCo2O4+ PMS system. Seven intermediates were identified, and their degradation pathways were proposed. Toxicity assessment using T.E.S.T software (its version is 5.1.1.0) revealed that the identified intermediates had lower toxicity compared to intact TC. A rice seed germination test further confirmed that the NiCo2O4+ PMS system effectively degraded TC into low-toxicity or non-toxic products. In conclusion, NiCo2O4shows promise as a safe and efficient catalyst in advanced oxidation processes (AOPs) for the degradation of organic pollutants.
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CHEMPHYSCHEM
·
2024
·
IF 2.3
Tao Yin,Yang Luo,Arvind Singh Chauhan,Riyang Shu,Zhipeng Tian,Chao Wang,Ying Chen,Navneet Kumar Gupta
In the catalytic transformation of bio-oil into liquid fuels having alkanes via hydrodeoxygenation (HDO), the acid and metal sites in the catalyst are pivotal for promoting the HDO of lignin-derived phenolic compounds. This study introduces a novel bifunctional catalyst comprising phosphomolybdenum-vanadium heteropolyacids (H4PMo11VO40) coupled with Ni/C. The HDO reaction of the model compound guaiacol was carried out under reaction conditions of 230 °C, revealing the superior performance of H4PMo11VO40 with Ni/C catalysts compared to the conventional acids, even at low dosage. The Keggin structure of H4PMo11VO40 provided a solid catalyst with strong acidic and redox properties, alongside advantages such as ease of synthesis, cost-effectiveness, and tunable acid and redox properties at the molecular level. Characterization of Ni/C and the prepared acid demonstrated favorable pore structure with a mesopore volume of 0.281 cm3/g and an average pore size of 3.404 nm, facilitating uniform distribution and catalytic activity of Ni-metal. Incorporating acid enhances the acidic sites, fostering synergistic interactions between metal and acidic sites within the catalyst, thereby significantly enhancing HDO performance. Guaiacol conversion at 230 °C reached 100%, with a cyclohexane selectivity of 89.3%. This study presents a promising pathway for converting lignin-derived phenolic compounds.
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ACS Catalysis
·
2024
·
IF 11.3
Yuexiang Li,Junliang Liu,Shuqi Li,Shaoqin Peng
Hydrogen production through electrochemical water splitting (EWS) presents a viable solution for addressing the fossil energy crisis. However, the commercial viability of this approach is impeded by the sluggish kinetics of the oxygen evolution reaction (OER). It is urgently needed to develop efficient, stable, and cost-effective OER electrocatalysts. Herein, we comprehensively design and investigate a phosphate ion and Fe3+ codecorating Ni(OH)2/NiOOH electrocatalyst (Pi-Fe:NiOH) for OER. This codecoration induces multiple synergistic effects, which include an increase in the interlayer water content for the internal OER, altering the OER mechanism, facilitating proton transport across the layers, and improving the stability of Pi-Fe:NiOH. Consequently, Pi-Fe:NiOH exhibits a high OER activity with overpotentials of 118 ± 1 and 222 ± 4 mV at current densities of 10 and 100 mA cm–2, respectively. More impressively, it maintains stable operation at a high current density of around 300 mA cm–2 for at least 500 h, much better than the Ni(OH)2/NiOOH electrocatalyst (NiOH) for less than 6 h at a current density below 200 mA cm–2. These findings offer insights for the design of anion–cation codoped hydroxide eletrocatalysts, paving a way for the development of efficient and stable OER electrocatalysts.
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Journal of Energy Chemistry
·
2024
·
IF 14
Yuan Zhuang,Kaixuan Wei,Zhenxing Li,Hanzhang Gong,Jianan Deng,Haozhong Yuan,Haoyu Lian,Hao Zheng,Honghao Zhao,Xiao Zhang,Jian Liu
Designing the coordination environment of heteroatoms around metal sites and optimizing the electronic structure of diatomic metal sites remain significant challenges in achieving efficient CO 2 overall splitting. Herein, we report four configurations (Cu/Ni–N 4 C 2 , Cu/Ni–N 2 C 4 , Cu/Ni–N 2 C 3 and Cu/Ni–N 2 C 2 ) constructed by precise regulation of the coordination environment around bimetallic atoms. Cu/Ni–N 2 C 2 showed high performance in electrochemical CO 2 reduction (ECR) and water oxidation evolution reaction (OER). In the electrochemical CO 2 overall splitting reaction, it achieved a Faraday efficiency of CO (FE CO ) of 98.0% at a low cell voltage of −2.9 V, significantly higher than widely reported values. Moreover, the FE CO is above 90% over −2.7 to −4.1 V of cell voltages. Cu/Ni–N 2 C 2 achieved long-term ECR stability of 110 h at −100 mA cm −2 . Mechanism studies revealed that the change of coordination environment around the diatomic pairs moves the d-band center of the Ni atom closer to the Fermi level, thereby modulating the adsorption capacity of the catalysts to the reaction intermediates *COOH and *O. This work presents valuable insights into the rational design of diatomic catalysts and elucidates the intricate structure-performance relationship in advancing electrochemical CO 2 overall splitting technology and energy-conversion applications.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Junyu Zhang,Mingye Yang,Teng Huang,Jinwei Sun,Wenyu Hu,Yangyang Li,Fuyuan Yang,Minggao Ouyang
Hydrogen production from alkaline water electrolysis (AWE) has promising potential in energy storage due to the advantages of low cost and large scale, but its bottleneck is the low current density and poor durability of non-precious metal electrodes. Although numerous electrode designs with superior activity have been reported, the complicated synthesis process and refined microstructure have not changed the high preparation cost, high resistance, and poor durability of conventional AWE electrodes. Here, we report an efficient synthesis strategy of high-density Ni-Fe-Ru electrode (particle size < 5 nm) and explore the synergistic effect between Ni-Fe-Ru elements at different potentials. The electrode exhibits excellent OER activity (264 mV@100 mA cm −2 , Tafel slope = 49 mV dec −1 ) and AWE performance (400 mA cm −2 @1.89 V), it can work stably for 300 h at 500 mA cm −2 , with potential for industrial applications.
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JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY
·
2024
·Vol. 39
·期 7
·1938-1947
·
IF 3.1
Lingke Li,Fei Wu,Yongsheng Liu,Tao He,Jie Lin,Wen Zhang,Rui Li,Haihong Chen,Keqing Zong,Zhen Zeng,Zhaochu Hu
Stable nickel (Ni) isotopes have shown great potential for investigating planetary accretion processes, mantle–crust magmatism, and paleo-marine evolution. The development of an economical and time-efficient separation method for Ni isotope analysis holds significant value within the realm of Ni isotope research. Previous purification methods for Ni isotope analysis have typically relied on either multi-column procedures or the utilization of significant quantities of organic reagents, such as acetic acid, acetone, and dimethylglyoxime. In this study, a novel two-column chromatographic separation procedure was presented for the determination of Ni isotope compositions in geological materials. A cation resin (AG50W-X8) was utilized in conjunction with diluted HCl and HF to effectively remove a substantial portion of matrix elements. Subsequently, trace amounts (100–200 μL) of Ni-spec resin were used for further purification of Ni. This relatively simple purification scheme for Ni isotope analysis effectively reduces the use of organic reagents and the amount of Ni-spec resin compared to previous methods that relied on multi-column separation and organic reagent extraction. Ni isotopic compositions were analyzed using multi-collector inductively coupled plasma mass spectrometry (MC-ICP-MS). The instrumental mass discrimination of Ni isotopic ratios was corrected for using the double spike (DS) combined with the sample–standard bracketing (SSB) method. The Ni isotope compositions (δ60Ni) of in-house standards (SCP and CUG) were −0.06 ± 0.05‰ (2 SD, n = 104) and 0.36 ± 0.06‰ (2 SD, n = 97), respectively. Furthermore, the measured δ60Ni values of various geological reference materials (BCR-2, BHVO-2, BIR-1, DTS-1, DTS-2b, SDO-1, GSP-2, and W-2a from the USGS; JB-1b from the GSJ; GSR-2, GSR-3, GSR-4, GSR-5, and GSR-10 from the NRCGA) were consistent with previous studies within measurement error. Additionally, the δ60Ni values of AGV-1 from the USGS, as well as those of GSR-10, GSR-12, GSR-15, GSR-17, GSR-18, and GSR-19 from the NRCGA are reported here for the first time. Based on repeated measurements of pure solutions and reference materials, the long-term reproducibility of δ60Ni values was better than ± 0.06‰ (2 SD). Consequently, our study presents a relatively straightforward purification method for Ni for its isotopic analysis using only trace amounts of organic reagents and Ni-spec resin.
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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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Small
·
2017
·Vol. 13
·期 41
·1701648
·
IF 8.643
Qian Zhang,Pengsong Li,Daojin Zhou,Zheng Chang,Yun Kuang,Xiaoming Sun
Hydrogen evolution reaction (HER) has prospect to becoming clean and renewable technology for hydrogen production and Ni–Mo alloy is among the best HER catalysts in alkaline electrolytes. Here, an in situ topotactic reduction method to synthesize ultrathin 2D Ni–Mo alloy nanosheets for electrocatalytic hydrogen evolution is reported. Due to its ultrathin structure and tailored composition, the as-synthesized Ni–Mo alloy shows an overpotential of 35 mV to reach a current density of 10 mA cm −2 , along with a Tafel slope of 45 mV decade −1 , demonstrating a comparable intrinsic activity to state-of-art commercial Pt/C catalyst. Besides, the vertically aligned assemble structure of the 2D NiMo nanosheets on conductive substrate makes the electrode “superaerophobic,” thus leading to much faster bubble releasing during HER process and therefore shows faster mass transfer behavior at high current density as compared with drop drying Pt/C catalyst on the same substrate. Such in situ topotactic conversion finds a way to design and fabricate low-cost, earth-abundant non-noble metal based ultrathin 2D nanostructures for electrocatalytic issues.
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高影响因子
SOLID STATE SCIENCES
·
2024
·
IF 3.4
Zhan Tian,He Wang,Guoqiang Li,Hongrui Jia,Guoxin Zhang
NiFe 2 O 4 has emerged as an efficient oxygen evolution reaction (OER) electrocatalyst, with outstanding stability in alkaline media and excellent redox properties. In order to further improve the catalytic performance, thinly-walled NiFe 2 O 4 nanotubes (NiFe 2 O 4 -NTs), efficiently derivable from Ni, Fe, N-codoped carbon nanofibers, were innovatively synthesized through a sequential route combing hydrothermal, electrospinning, and high-temperature sintering in this work. The NiFe 2 O 4 -NTs possess large diameter of around 120 nm and their thickness of the tube wall is only about 10 nm. The surface properties of NiFe 2 O 4 can be adjusted by forming the Ni-N/Fe-N bonds. Excitingly, largely exposed active surface area and boosted catalytic reaction kinetics toward oxygen evolution reaction are realized. The required overpotential to deliver 10 mA cm −2 is only 331 mV, accompanied with favorable Tafel slope of only 51.8 mV dec −1 , small charge transfer resistance, and superior reaction stability.
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