Journal of Materials Chemistry C
·
2018
·Vol. 6
·期 36
·9615-9623
·
IF 5.976
Dawei Liu,Yunchen Du,Zhennan Li,Yahui Wang,Ping Xu,Honghong Zhao,Fengyuan Wang,Chaolong Li,Xijiang Han
Rational design of the microstructure of functional materials provides a new opportunity to improve their performance. However, it is always difficult to construct desirable microstructures in magnetic metals due to their strong magnetic interactions. Herein, we demonstrate the successful synthesis of three-dimensional flower-like Ni microspheres (FNMs) through a simple two-step process, in which flower-like Ni(OH)2 microspheres are firstly prepared by a hydrothermal route and then are reduced under a high-temperature H2/N2 atmosphere. The as-prepared FNMs are composed of cross-linked nanoparticles directed by their precursor. Compared with commercial and home-made Ni powder, FNMs exhibit enhanced conductivity and dielectric loss ability, as well as significantly improved impedance matching. As a result, FNMs exhibit good microwave absorption properties, including a strong reflection loss (−56.8 dB at 15.8 GHz) and a broad qualified frequency range (2.5–18.0 GHz) with thicknesses ranging from 5.0 to 1.0 mm and a thin matching thickness of 1.12 mm. Such an excellent performance is substantially superior to those of Ni-based materials derived from various elaborate strategies. It is believed that our work may inspire the controlled synthesis of conventional magnetic metal materials with enhanced microwave absorption properties in the future.
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DOI
高影响因子
Nanomaterials
·
2019
·Vol. 9
·期 7
·932
·
IF 4.034
Dazheng Chen,Gang Fan,Hongxiao Zhang,Long Zhou,Weidong Zhu,He Xi,Hang Dong,Shangzheng Pang,Xiaoning He,Zhenhua Lin,Jincheng Zhang,Chunfu Zhang,Yue Hao
Indium thin oxide (ITO)-free planar perovskite solar cells (PSCs) were fabricated at a low temperature (150 °C) in this work based on the transparent electrode of photolithography processed nickel/gold (Ni/Au) mesh and the high conductivity polymer, PH1000. Ultrathin Au was introduced to increase the conductivity of metal mesh, and the optimal hexagonal Ni (30 nm)/Au (10 nm) mesh (line width of 5 μm) shows a transmittance close to 80% in the visible light region and a sheet resistance lower than 16.9 Ω/sq. The conductive polymer PH1000 not only smooths the raised surface of the metal mesh but also enhances the charge collection ability of metal mesh. The fabricated PSCs have the typical planar structure (glass/Ni-Au mesh/PH1000/PEDOT:PSS/MAyFA1−yPbIxCl3−x/PCBM/BCP/Ag) and the champion PSC (0.09 cm2) obtains a power conversion efficiency (PCE) of 13.88%, negligible current hysteresis, steady current density and PCE outputs, and good process repeatability. Its photovoltaic performance and stability are comparable to the reference PSC based on the ITO electrodes (PCE = 15.70%), which demonstrates that the Ni/Au mesh transparent electrodes are a promising ITO alternative to fabricate efficient PSCs. The relatively lower performance of Ni/Au based PSC results from the relatively slower charge extraction and stronger charge recombination than the ITO based PSC. Further, we tried to fabricate the large area (1 cm2) device and achieve a PCE over 6% with negligible hysteresis and steady current density and PCE outputs. The improvements of perovskite film quality and interface modification should be an effective approach to further enhance the device performance of Ni/Au based PSCs, and the Ni/Au mesh electrode may find wider applications in PSCs and flexible devices.Keywords:metal mesh;transparent electrode;photolithography;perovskite solar cell;large-area solar cell
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DOI
PubMed
高影响因子
Catalysts
·
2017
·Vol. 7
·期 12
·383
·
IF 3.082
Nana Li,Yadong Bi,Xiaoqiang Xia,Hui Chen,Jianli Hu
The hierarchical HZSM-5 zeolite was prepared successfully by a simple NaOH treatment method. The concentration of NaOH solution was carefully tuned to optimal the zeolite acidity and pore structure. Under NaOH treatment conditions, a large number of mesopores, which interconnected with the retained micropores, were created to facilitate mass transfer performance. There are very good correlations between the decline of the relative zeolite crystallinity and the loss of micropores volume. The Ni nanoclusters were uniformly confined in the mesopores of hierarchical HZSM-5 by the excessive impregnation method. The direct deoxygenation in N2and hydrodeoxygenation in H2of the methyl laurate were compared respectively over the Ni/HZSM-5 catalysts. In the N2atmosphere, the deoxygenation rate of the methyl laurate on the Ni/HZSM-5 catalyst is relatively slow. In the presence of H2, the synergistic effect between the hydrogenation function of the metal and the acid function of the zeolite supports can make the deoxygenation level more obvious. The yield of hydrocarbon products gradually reached the maximum with the appropriate treatment concentration of 1M NaOH, which could be attributed to the improved mass transfer in the hierarchical HZSM-5 supports.
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高影响因子
CATALYSIS TODAY
·
2020
·
IF 5.825
Hong Du,Xiuyun Ma,Miao Jiang,Peifang Yan,Yang Zhao,Z. Conrad Zhang
The lignocellulosic biomass utilization is a feasible way to obtain alternative fuels and chemicals. Xylitol as an ideal sweetener is one of the top twelve value-added chemicals derived from biomass. Xylitol is also used in the pharmaceutical and cosmetics industries. Thus, the production of xylitol from biomass is significantly important. A silica supported nickel catalyst derived from nickel phyllosilicate for efficient aqueous phase xylose hydrogenation to xylitol was developed in this study. Higher xylose conversion was observed over the nickel phyllosilicate derived catalyst compared to nickel oxide derived nickel catalyst prepared by impregnation and commercial Raney Ni catalyst. The excellent xylitol selectivity (approximately 99 %) was also obtained over the nickel phyllosilicate derived catalyst. The differences in structure and property resulted from different preparation methods were investigated by means of XRF, N 2 physisorption, XRD, FT-IR, H 2 -TPR, TEM as well as H 2 -TPD. The higher nickel dispersion of nickel phyllosilicate derived catalysts, which could be synthesized by ammonia evaporation and deposition-precipitation using Na 2 CO 3 as precipitator, led to higher xylose conversion. In addition, the phyllosilicate derived nickel catalyst demonstrated outstanding stability. Consequently, phyllosilicate derived nickel catalyst is promising for the industrial application for the production of xylitol form xylose aqueous hydrogenation thanks to its higher activity and selectivity as well as good stability.
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DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2017
·
IF 9.446
Qizhao Wang,Jijuan He,Yanbiao Shi,Shuling Zhang,Tengjiao Niu,Houde She,Yingpu Bi,Ziqiang Lei
The leaf-like structure BiVO 4 electrode and MFe 2 O 4 /BiVO 4 (M = Ni, Co) composite photoelectrodes were prepared by electrochemical deposition, ensuing heating treatment and electrophoretic deposition technology. The characterizations of SEM, XRD and DRS indicated that the BiVO 4 derivatives mainly existed in small nanoparticles with monoclinic phase and exhibited stronger light absorption capability than that of pure BiVO 4 . Hereon, the respective photoelectrochemical (PEC) activities of BiVO 4 and its derived composites were systematically studied. The results suggested that the NiFe 2 O 4 /BiVO 4 and CoFe 2 O 4 /BiVO 4 not only showed higher photocurrent response values at 1.23 V vs. NHE than pure BiVO 4 electrode under visible light illumination, but also played a superior PEC hydrogen evolution performance, which was considered owing to their strong absorption to light, reduction combination of carriers and effective separation of electrons and holes.
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DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2021
·
IF 3.764
Yang Pan,Bin Yang,Ning Jia,Yangnan Yu,Xiang Xu,Yingying Wang,Ru Xia,Jiasheng Qian,Chenjun Wang,Aiqing Sun,You Shi,Yirong Fang
In this work, Ni@GNP nanohybrids fabricated via an in situ reduction method were incorporated into polymethyl methacrylate (PMMA) to prepare PMMA/Ni@GNP nanocomposites via solution blending and hot-pressing. The Ni nanoparticles with an average diameter of 70–80 nm were observed to successfully grow on the GNP surface via SEM and TEM. Both thermally conductive and microwave absorbing properties of the prepared composites were intensively investigated. A reflection loss test experimentally suggested that the PMMA/Ni@GNP composites showed a good microwave absorbing property, among which the composite containing 30 wt % Ni@GNP displayed the best microwave absorption performance (with a value of −30 dB for RLmin in the C band). The thermal conduction behavior of the composites was jointly studied by infrared thermal imaging (ITI) and enthalpy transformation method together with a four-parameter model. The average heating rate during an initial stage was obviously found to increase from 65.4 to 103.2 °C/min, indicating that a well-defined heat conduction network gradually formed in the composites, which exerted positive influence on heat conduction. The composites generally bore perfect thermal conductivities (e.g., with a maximum in-plane thermal conductivity of 9.02 W/m·K and a maximum out-of-plane value of 1.29 W/m·K), and the variations of thermal conductivity versus filler loading should be attributed to the construction of an anisotropically thermally conductive network in the composites. The PMMA/Ni@GNP composites with desirable microwave absorption and thermal conductivity would find potential applications in 5G communication devices.
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高影响因子
IONICS
·
2021
·Vol. 27
·期 3
·1339-1345
·
IF 2.817
Huang Zixu,Zhang Lijun,Cao Pengfei,Wang Nan,Lin Meng
A Ni-based metal-organic framework (Ni-MOF) modified electrode was fabricated for electrochemical detection of dopamine. The Ni-MOF was synthesized by ionothermal synthesis method using an ionic liquid as a template. The morphology and composition of the Ni-MOF were characterized by scanning electron microscope, X-ray diffraction, thermogravimetric analysis, and attenuated total reflection Fourier transform infrared spectroscopy. Electrochemical responses of the Ni-MOF modified electrode toward dopamine were performed using differential pulse voltammetry. The electrochemical sensing performance of the Ni-MOF modified electrode toward dopamine was improved by the introduction of ionic liquid with a wide linear range (0.2–100 μmol L −1 ), and a low detection limit (60 nmol L −1 ). Further studies indicated that the modified electrode exhibited great selectivity to dopamine in complex mixtures, and the Ni-MOF modified electrode also has excellent stability and reproducibility. Moreover, the analysis of real samples confirmed that the modified electrode has a certain reliability.
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DOI
高影响因子
Nano Research
·
2014
·Vol. 7
·期 9
·1337-1343
·
IF 6.963
Xiang Ji,Li Peng,Chong Hanbao,Feng Li,Fu Fangyu,Wang Zhuang,Zhang Shilin,Zhu Manzhou
A simple and efficient solution-based method for the synthesis of Pd-Ni bimetallic nanoparticles (NPs) has been developed. A series of Pd-Ni bimetallic NPs were readily achieved by reduction of PdCl 2 and Ni(acac) 2 (acac = acetylacetonate) in the presence of oleylamine (OAm), oleic acid (OA) and benzyl alcohol. Furthermore, by using high-resolution transmission electron microscopy (HRTEM), energy-dispersive spectrometry (EDS) mapping and X-ray diffraction (XRD), we demonstrate that the as-prepared Pd-Ni bimetallic NPs have core-shell structures with a Pd-rich core and a Ni-rich shell. In addition, the as-obtained Pd-Ni bimetallic NPs with varying compositions show excellent catalytic activities in the Miyaura-Suzuki reaction. When the nickel molar percentage was 0.23 to 0.65, the conversion with the as-obtained Pd-Ni bimetallic catalysts was above 90%. It is believed that this strategy can be employed to produce a variety of other well-defined core-shell type multimetallic nanostructures.
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DOI
高影响因子
ENERGY & FUELS
·
2012
·
IF 2.721
Hualiang Zuo,Qiying Liu,Tiejun Wang,Longlong Ma,Qi Zhang,Qing Zhang
Catalytic hydrodeoxygenation (HDO) of vegetable oils to renewable alkane-type biofuels has attracted more and more concern in recent years. However, the presently used catalysts were mainly focused on the sulfided CoMo and NiMo catalysts, which inevitably posed sulfur contamination in final products. Therefore, exploring nonsulfured catalyst for this processing is of fundamental importance, but it is still an open challenge. In this paper, we prepared the sulfur free Ni supported on SiO2, γ-Al2O3, SAPO-11, HZSM-5, and HY by incipient wetness impregnation and tested the catalytic performance in HDO of methyl palmitate. Alkanes with long carbon chains were mainly produced with two possibly parallel approaches: hydrogenation of hexadecanal to hexadecanol, followed by dehydration/hydrogenation to C16 alkane and decarbonylaton/decarboxylation of hexadecanoic acid to C15 alkane. The acidity of catalysts significantly influenced their catalytic performance, and the Ni/SAPO-11 catalysts with weak and medium acidity showed superior properties to the other catalysts due to the synergistic effect of metal Ni and acidic support. The maximum yield of 93% for C15+ alkanes was observed over 7 wt % Ni/SAPO-11 under the mild reaction conditions of 493 K and 2 MPa, indicating its promising application in this reaction.
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高影响因子
Journal of Materials Chemistry A
·
2018
·Vol. 6
·期 35
·16810-16817
·
IF 9.931
Dazhong Zhong,Lei Zhang,Chengcheng Li,Dandan Li,Congcong Wei,Qiang Zhao,Jinping Li,Jinlong Gong
Electrochemical water splitting into hydrogen and oxygen is one of the most promising strategies for the utilization and storage of solar energy. However, the sluggish kinetics of the oxygen evolution reaction (OER) hinder its larger-scale application. NiFe-based catalysts are some of the most efficient oxygen evolution catalysts (OECs). High-valence Ni is considered as an active site or conductive framework in NiFe-based OECs. However, the oxidation of Ni is usually hindered in the presence of Fe. This paper describes an effective strategy to produce NiFe (oxy)hydroxide with easily oxidized Ni and a hierarchical nanosheet structure as the most efficient OEC. High valence Ni may provide frameworks with good conductivity and facilitate OERs in Fe active sites. In addition, the hierarchical structure can increase the electrochemical surface area, resulting in more active sites for the OER. The as-prepared Fe–O–Ni(OH)2 supported on nickel foam needs overpotentials of 185, 220 and 261 mV to drive current densities of 10, 100 and 500 mA cm−2, respectively. The catalyst also shows excellent stability at the current densities of 100 and 500 mA cm−2 for 50 hours.
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高影响因子
Sustainable Materials and Technologies
·
2025
·
IF 9.2
Haize Jin,Xiaoxia Huang,Wen Yijun,Mengyao Zhu,Cuixia Li,Qikun Wang
Photothermal synergistic catalysis provides an efficient implementation strategy for CO₂ conversion into renewable energy. Here, we synthesized a geopolymer/g-C₃N₄/Ni(OH)₂ (GCN) photothermal catalyst featuring nanoscale-interval exposed adsorption and photothermal catalytic active sites through concurrent geopolymerization and alkaline precipitation reactions. The rational modulation of Ni(NO₃)₂ proportion induced explosive nucleation of Ni(OH)₂, ultimately resulting in a nanostructure where geopolymer nanoclusters and Ni(OH)₂ nanocrystals were intergrowth on the g-C₃N₄ interface. The construction of this ternary system effectively enhanced the photogenerated electrons transfer efficiency, and synergized with the thermal effect to significantly improve CO₂ reduction efficiency. And the GCN demonstrated exceptional capture capabilities for both CO₂ and H₂. Under light irradiation, GCN exhibited non-thermal photochemical effect characteristics. Through the photo-assisted thermal catalysis synergistic action, the CO₂ conversion product rate reached 1057.89 mmol.g cat −1 .h −1 , which was 17,869.84 times and 1.16 times higher than those under pure photocatalysis and pure thermal catalysis, respectively. The corresponding CO selectivity can reach 96.05 %. And GCN exhibited stable photothermal cycling performance, the production rate in the 10th cycle still reached 970.28 mmol·g cat −1 ·h −1 . Moreover, the formation of chemical bonds at the geopolymer/Ni(OH)₂ interface effectively suppressed the excessive reduction of Ni(OH)₂ to metallic Ni 0 , thereby inhibiting deep hydrogenation of CO and ensuring high CO selectivity. This study provides both theoretical and technical foundations for the development of low-cost and high-efficiency CO₂ photothermal reduction catalysts.
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高影响因子
ACS Catalysis
·
2025
·
IF 13.1
Yanchun Shi,Jimei Zhang,Sihan Sun,Bi Wu,Lei Wang,Yulong Wu,Dingsheng Wang
Upgrading lignin-derived phenols to high-value arenes has garnered significant attention, while the major challenge lies in the selective cleavage of Caromatics–OH via hydroxyl hydrogenolysis. We systematically investigated the morphology-dependent properties of Ni@S-1 catalysts, encompassing their physicochemical characteristics, Ni nanoparticle properties, and the interaction between NiOx species and silicalite-1 (S-1) crystals as well as their performance in hydroxyl hydrogenolysis of vapor-phase m-cresol conversion. Both Ni@S-1 exhibited comparable Ni loading and crystal sizes but distinct morphologies, which originated from the complex intergrowth structures leading to variations in the dispersion and the location of Ni nanoparticles and significant differences in the shape-selective catalysis based on the confinement effect of S-1 channels for the vertical adsorption of m-cresol. Ellipsoidal Ni@S-1-Ell achieved m-cresol conversion of 96.9% (model reaction) along with hydrogenolysis products’ yield of 94.0%, which was 6.97 times in conversion and 22.38 times in yield of hydrogenolysis products than those of cylindrical Ni@S-1-Cyl under identical reaction conditions at 300 °C, 2.5 atm, and a feed rate of 6.0 g[m-cresol]/g[catalyst]·h.
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