DIAMOND AND RELATED MATERIALS
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2025
·
IF 5.1
Jintao Huang,Xinfei Zeng,Wentao Yu,Haichen Zhang,Yonggang Min
Electromagnetic wave (EMW) absorption materials play a unique role in both civilian and military domains, hence the creation of high-performance EMW absorbing materials that are “light, thin, broad, and strong” is of significant importance. In this study, we introduced nanoscale nickel metal into the precursor solution during the polymerization phase via in-situ polymerization, and then combined phase separation and high-temperature pyrolysis to prepare polyimide-based porous carbon (PIC)/Ni nano-particles composite (PIC/Ni). The experimental outcomes demonstrate that the introduction of Ni nano-particles, which bring about magnetic loss, has improved the narrow effective absorption bandwidth of the single PIC EMW absorbing material. By controlling the carbonization temperature, it was found that PIC/Ni-700 has a strong capability for EMW loss. Moreover, at a thickness of 4.21 mm, the PIC/Ni-700 exhibits the strongest EMW loss capability at a frequency of 6.16 GHz, recording a minimum reflection loss (RL) of −39.41 dB. PIC/Ni-700 demonstrates effective absorption bandwidth (EABW) of 5.20 GHz (2.0 mm) and 4.16 GHz (2.5 mm), showcasing its characteristic of broadband absorption.
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JOM
·
2025
·
IF 2.3
Yin Ning,Song Yonghui,Zhang Xingyu,Dong Ping,Zhang Xinwei
We aimed to recover Ni and Co from the leaching sulfate solution of nickel-based superalloy scraps (NSL) and to synthesize NiCo 2 O 4 through oxalate co-precipitation-calcination technique. The structural and compositional analyses of the resultant products were characterized utilizing x-ray diffraction (XRD), x-ray photoelectron spectroscopy (XPS), and scanning electron microscopy (SEM). Furthermore, the effects of nickel-cobalt molar ratio and calcination temperature on the oxygen evolution reaction (OER) performance were investigated. The results indicated that under optimal conditions of 0.7 M C 2 O 4 2− addition, 25°C, and 4 h reaction time, the precipitation efficiencies for Co 2+ and Ni 2+ were 99.19% and 95.79%, respectively. The precipitate derived from adjusting the Ni/Co molar ratio in NSL manifested as a solid solution of nickel-cobalt oxalate (Ni x Co 3-x (C 2 O 4 ) 3 ). As the molar ratio decreased, the precipitates gradually transformed from a nickel oxalate structure with Ni sites replaced by Co to a cobalt oxalate structure with Ni replacing Co sites. The pure phase structure NiCo 2 O 4 , synthesized with a Ni/Co molar ratio of 1/2 and calcined at 450°C for 2 h, exhibited an overpotential of 430 mV at a current density of 10 mA·cm −2 in 0.1 M KOH, a Tafel slope of 93.69 mV·dec −1 , and a C dl of 242.75 mF·cm −2 . Upon exceeding 450°C during calcination, the gradual expulsion of heteroatoms from the matrix resulted in structural destruction. Consequently, the electrocatalytic activity of the sample decreased because of the gradual removal of surface oxygen vacancy concentration and Co 3+ /Co 3+ + Co 2+ . The methodology employed in this study not only efficiently recovers Ni 2+ and Co 2+ from the NSL but also prepares electrocatalysts with superior performance for the oxygen evolution reaction.
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CHEMICAL ENGINEERING JOURNAL
·
2024
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IF 13.3
Zishen Lin,Chunli Zheng,Zhenxing Wang,Yuanzhe Peng,Guoqing Geng,Aibin Zhu,Chi He
As one category of promising and efficacious purification material toward environmentally harmful heavy metals, sulfidated amorphous zero-valent Iron (S@AZVI) exhibits unparalleled removal performance. Due to the disruptive crystal growth however, the irreversible loss of Fe 0 component during conventional synthesis route poses a substantial hindrance to its industrial application. To address this, we propose a post-sulfidation strategy to hinder the transformation of Fe 0 by altering the shell composition of AZVI from Fe 2 O 3 to FeS, which maintains a remarkable Fe 0 content up to 75.7 % over finally obtained S@AZVI, far higher than the material obtained through the one-step sulfidation . Attributing to the synergy of FeS shell and substantial Fe 0 , S@AZVI demonstrates impressive performance as the lowest free corrosion potential (−1.050 V) and work function (4.058 eV), and subsequently exhibits a notable enhancement in the removal efficiency of Cr(VI) and Ni(II), surpassing AZVI by 1.8 and 2.0 times, respectively. Results reveal that the adsorption, reduction, and coprecipitation constitute the mechanisms governing the removal of Cr(VI) and Ni(II). In practical electroplating wastewater experiments, S@AZVI effectively removes Cr(VI) and Ni(II) within a 60-min timeframe, meeting established emission standards. These findings provide valuable insights for future AZVI material synthesis for heavy metal elimination.
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ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Xiaonan Xu,Nana Luo,Wan-Hui Wang,Ming Bao,Jiasheng Wang
Fatty acid hydrogenation is an important method for the production of fatty alcohols. The combination of Ni and Mo has been reported to be an effective and low-cost catalyst. However, the effect of Mo doping has yet to be fully understood. Here Ni-MoOx/TiO2 catalysts were prepared via simple impregnation. and the enhancement effects of Mo doping were comprehensively revealed. First, MoOx can attract electrons from Ni, reduce the electron density of Ni to improve the intrinsic activity of Ni, and form a Niδ+-(MoOx)δ− heterojunction to induce H2 heterolytic cleavage to active hydrogen ions. Second, the reduction of MoOx generates oxygen vacancies, which can absorb C═O of the fatty acid and facilitate the reaction progression. Third, a Ni1–xMox solid solution can be formed, which can increase the hydrogen adsorption quantity and accelerate the reaction rate. Finally, the bond strength of Mo–O is found to be the most optimum that can absorb the fatty acids while releasing the alcohols so as to recover the oxygen vacancies and avoid overhydrogenation. Therefore, high activity and selectivity for the hydrogenation of carboxylic acid substrates to alcohols can be obtained. Under significantly milder conditions (155 °C, 3 MPa H2) the catalyst provided a 98% yield of lauryl alcohol from lauric acid hydrogenation with a low activation energy of 40.1 kJ/mol. This work could provide an insightful understanding about the effects of Mo doping to Ni on catalyzing hydrogenation reactions.
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PubMed
高影响因子
RSC Advances
·
2024
·Vol. 14
·期 24
·16747-16757
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IF 3.9
Siyi Mi,Lungang Chen,Xinghua Zhang,Qi Zhang,Longlong Ma,Jianguo Liu
One of the main obstacles to the development of sustainable biomass feedstocks today is the research of selective hydrogenation of biomass platform compounds for the synthesis of high-value chemicals. This work reports on the synthesis of a Ni/Fe bimetallic catalyst with nitrogen-doped carbon serving as the carrier, hydrogen serving as the primary donor, and isopropanol serving as the reaction medium and serving as a secondary donor. Vanillin was catalytically hydrogenated to produce 4-methylguaiacol, a complete hydrogenation product, under a reaction temperature of 200 °C for four hours. A single product with a good yield (95.26% conversion and selectivity up to 99%) was achieved by the moderate conditions, offering a potential route for the catalytic hydrogenation of biomass platform compounds.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Wangchang Geng,Pengfei Song,Xinrou Cao,Libing Duan
Metal oxides derived from metal-organic frameworks (MOFs) can maintain the porosity and unique structure of MOFs, giving them significant development potential in the field of gas sensing. In this study, bimetallic Ni/Zr-MOFs solid microspheres were synthesized via the solvothermal method, and NiO/ZrO 2 composites with p-p heterostructure were further prepared through an annealing process. The morphology, structure, specific surface area, and pore size of NiO/ZrO 2 composites were analyzed using a series of characterization techniques. The gas sensing performance study showed that the NiO/ZrO 2 -2 sensor exhibited higher response (32.3–100 ppm), lower detection limit (7.2 ppb), shorter response/recovery time (55 s/83 s), and excellent repeatability to triethylamine gas at the operating temperature of 240 ℃. Additionally, within a specific range (1–200 ppm), a strong linear relationship was observed between the response value and the gas concentration for the NiO/ZrO 2 -2 sensor (R 2 =0.9588). This study is expected to provide a valuable reference for designing high-performance triethylamine sensors.
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INTERNATIONAL JOURNAL OF ENVIRONMENTAL ANALYTICAL CHEMISTRY
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2025
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IF 2.5
Zhiyuan Chen,Ling Wang,He Lu,Haoyong Yin,Shengji Wu
A portable and highly sensitive electrochemical sensor for nitrite detection was developed using a NixSy/Ni/N-doped carbon nanotube (N-CNT) nanocomposite. The hybrid was fabricated by in situ growth of Ni nanoparticles on MOF-derived N-CNTs followed by hydrothermal sulfidation to form NixSy. This hierarchical nanostructure provided abundant active sites, large surface area, and enhanced conductivity. Electrochemical studies revealed outstanding nitrite sensing performance, with a wide linear range (0.2 μM–22 mM), high sensitivity (163.77 μA mM−1 cm−2), and a low detection limit (0.2 μM). The sensor showed excellent selectivity, reproducibility, and stability. Real sample analyses, including water, beverages, and pickled brine, yielded recoveries of 98.71–103.87% with low RSDs. A smartphone-integrated portable sensing system was also demonstrated, enabling accurate on-site nitrite monitoring. This work offers an effective strategy for designing advanced, field-deployable electrochemical sensors for food safety and environmental analysis.
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CHEMPHYSCHEM
·
2025
·
IF 2.2
Li Ma,Wei-Ming Yang,Lin Xue,Jie Zhang,Ke-Xin Lin,Pei-Jian Chen,Xiang Zhang,Hai-Shun Liu
Graphical The co-catalysis of iron-nickel bimetals can not only achieve the complete degradation of organic pollutants but also continue to be recycled. The introduction of Ni enhances the reducibility of the 3D Fe 50 Ni 50 catalyst surface, promotes electron transfer, enriches the surface with Fe (II) during degradation, maintains activity, and provides a self-healing effect. Advanced oxidation processes offer a potent, eco-friendly solution for degrading organic wastewater. Creating high-activity and stability catalysts is crucial to addressing water pollution concerns. Nevertheless, due to constraints in their preparation, prevalent catalysts often lack satisfactory cyclic stability and pose challenges in recovery. This research introduces an innovative catalyst, the 3D printed Fe-Ni porous framework (3D Fe 50 Ni 50 ), characterized by its high activity, robust stability, and straightforward recovery process. The catalytic performance of 3D Fe 50 Ni 50 is attributed to the synergistic effects of its bimetallic constituents and its distinct porous architecture. Under optimal conditions, the kinetic reaction constant reaches 1.56 min −1 . It represents a 26-fold increase over commercially available Fenton's reagent ZVI powder. And the Fe 50 Ni 50 catalyst can be employed cyclically up to 132 times, maintaining a degradation efficiency of over 90% relative to its initial performance. The findings of this article suggest that incorporating Ni augments the catalyst surface's reducibility, facilitating electron transfer. This bestows the catalyst with a nice self-healing ability, ensuring sustained degradation. This investigation paves the way for the design of catalysts with heightened activity and stability and presents promising applications in wastewater treatment.
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TALANTA
·
2022
·
IF 6.556
Lili Xiao,Kaixiu Yang,Jiaxing Duan,SiYan Zheng,Jin Jiang
In this work, spherical Ni-based metal-organic frameworks (Ni-MOFs) were used as precursors for preparing nanorod-like nickel phosphate (r-NiPO) with enhanced electro-catalytic properties in detection of glucose. It was found that the addition of nickel ion has a profound effect on construction of nickel phosphate with flower-like, rod-like, and ribbon-like structure in presence of H 2 PO 2 − . The r-NiPO consisted of multiple phases of nickel phosphate showed porous, interconnected structure and abundant active Ni(II)/Ni(III) pairs, which was beneficial to facilitate glucose oxidation. In comparison with Ni-MOF, r-NiPO exhibited the superior electrocatalytic property on oxidation of glucose because of the exposing more active Ni sites in r-NiPO than that of Ni-MOF precursor. r-NiPO modified glassy carbon electrode (r-NiPO/GCE) showed a good linear response to glucose from 1.0 μM to 3.0 mM with a high sensitivity of 3169 μA mM −1 cm −2 . In addition, r-NiPO/GCE can be used to detect glucose in human serum with satisfactory recoveries (90–97%).
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Journal of Materials Chemistry A
·
2021
·Vol. 10
·期 3
·1369-1379
·
IF 12.732
Yegui Fang,Yusheng Fang,Ruoqi Zong,Zhouyang Yu,Youkun Tao,Jing Shao
One core reaction involved in many electrochemical energy conversion systems is the oxygen evolution reaction (OER), which usually dominates the overall polarization loss due to its sluggish kinetics. Activating O2 electrocatalysis on the catalyst surface requires effective regulation of the surface spatial and electronic structure to facilitate the in situ generation of active species. Here, we report an in situ surface reconstruction method to boost the activity of a Ni-based perovskite hydroxide, NiSn(OH)6, for OER catalysis. The surface reconstruction is modulated by anodic polarization during the OER process, building a Ni3+-containing amorphous layer with selective Sn etching. Taking advantage of the in situ surface amorphization that facilitates the generation of active metal oxy(hydroxide) species, a significant performance enhancement is achieved on NiSn(OH)6. Theoretical calculations further demonstrate that the Sn vacancies on the surface optimize the electronic structure of the Ni sites and promote the adsorption of the reaction intermediates.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Xun Wang,Zewei Liu,Jian Yan,Daofei Lv,Xin Chen,Feng Xu,Xin Zhou,Zhong Li
Developing adsorbents with exceptional CH 4 /N 2 selectivity under high pressure is a crucial commercial requirement and a significant technical challenge for the industrial high-pressure swing adsorption (HPSA) in CH 4 /N 2 separation. Only a few adsorbents were reported to address this issue. In this work, we aimed to explore two microporous MOFs with low-polarity channels for high-pressure CH 4 /N 2 separation. The Ni(BDC)(DABCO) 0.5 and its isostructural analog Ni(TMBDC)(DABCO) 0.5 were synthesized, characterized, and examined for high-pressure CH 4 /N 2 adsorption property. Due to the lower polarity channel originating from tetramethyl groups, Ni(TMBDC)(DABCO) 0.5 exhibited an exceptional methane capacity of 4.23 mmol/g and an IAST selectivity of 5.1 for the CH 4 /N 2 binary mixture at a pressure of 10 bar, surpassing the majority of previously reported materials. The GCMC simulation revealed that the low-polarity pore surfaces in both materials exhibited a higher affinity for CH 4 molecules compared to N 2 molecules, under both ambient and high pressures. The breakthrough experiments showed that Ni(TMBDC)(DABCO) 0.5 exhibited excellent dynamic separation towards CH 4 /N 2 under both 1 bar and 5 bar, indicating great potential as an emerging candidate for the recovery of CH 4 from coal-mine methane in industrial PSA processes.
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MATERIALS AND CORROSION-WERKSTOFFE UND KORROSION
·
2016
·Vol. 67
·期 10
·1034-1041
·
IF 1.45
L.T. Shi,J. Hu,L. Fang,F. Wu,X. L. Liao,F. M. Meng
Ternary Ni-Co-P/TiN (20 nm) nanocomposite coatings with Co content in the range of 0–23 wt% were successfully co-deposited on Al alloys by electroless plating. The morphology, composition, microstructure, micro-hardness, wear behavior, and corrosion properties of the coatings were tested using SEM, EDS, XRD, Vickers hardness, ball-on-disc wear tester, and electrochemical workstation, respectively. The effect of Co content on the tribological and corrosion properties of Ni-Co-P/TiN coatings was studied. It is found that all the coatings have a compact and rough granular structure with sub-micro globules non-uniformly distributed on the surface. The grain size and the content of Ni and P decrease, but the micro-hardness, adhesion force, friction coefficient, and corrosion resistance correspondingly enhance with the increase of Co content in Ni-Co-P/TiN coatings. The improved corrosion resistance of Ni-Co-P/TiN coating is due to the passivation behavior and small grain caused by the introduction of Co. Based on the excellent properties on the wear and corrosion resistance, ternary Ni-Co23-P/TiN coating with high Co content, may be applied as an optimum protective coating for Al alloys.
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