JOURNAL OF ALLOYS AND COMPOUNDS
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2022
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IF 6.371
He Zhang,Jun-Ru Liu,Guo-Hua Zhang
In this paper, excellent performance W-Cu-Ni-Fe alloys with the addition of Ni and Fe (total content: 5 wt%) were successfully prepared by low temperature liquid-phase sintering, using the raw material of ultrafine W-Cu-Ni-Fe composite powder. Ultrafine W-Cu-Ni-Fe composite powder with high sintering activity and uniform composition distribution was prepared by a two-stage reduction method consisting of carbothermal reaction and hydrogen deep deoxidation. Additions of Ni and Fe not only improved the wettability between W and Cu two phases, but also improved the bonding strength of two-phase interface. All sintered samples had higher relatively densities to ensure that the samples have great comprehensive properties. When Ni and Fe were co-added in appropriate proportions, the highest tensile strength and elongation of W-Cu-Ni-Fe alloy samples were 497 MPa and 9.12 % for the composition: W-3.5 wt%Ni-1.5 wt%Fe-25 wt%Cu, respectively. Meanwhile, with increasing Ni content from 0 wt% to 5 wt%, the compressive strength and failure strain of alloy samples increased from 1160 MPa to 2376 MPa and from 53 % to 98 %, respectively. In addition, with the enhancement of the solid solution strengthening effects of Ni and Fe on Cu matrix, the bending strength and microhardness of the alloy samples increased to 1174 MPa and 361 HV for composition: W-3.5 wt%Ni-1.5 wt%Fe-25 wt%Cu, respectively. Although the additions of Ni and Fe made the Cu matrix network structure have a uniform distribution, it led to a decrease in the electron transfer ability of the alloy, and thus, there was a decrease in electrical conductivity .
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高影响因子
APPLIED SURFACE SCIENCE
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2022
·
IF 7.392
Yonggang Liu,Zhe Liu,Lei Jia,Daqiang Gao,Zhenghua Tang
NiO is widely considered as one of most forceful noble-metal-free oxygen evolution reaction (OER) catalysts due to its high intrinsic catalytic activity and robust stability. However, the unsatisfactory conductivity has become a stumbling block for further improving its catalytic performance. Here, a Ni/NiO hierarchical heterojunction is synthesized by an interface engineering strategy. The developed strategy endows the electrocatalysts adequately exposed catalytic active sites, optimized kinetics, including rapid charge and mass transfer, bubble release, and reduced intermediate adsorption free energy. Therefore, the obtained Ni/NiO 150 catalyst displays an overpotential of 280 mV to reach a current density of 10 mA cm −2 and a small Tafel slope of 67 mV dec −1 . In addition, Ni/NiO 150 exhibits a negligible current attenuation after 25 h amperometric operation, indicating outstanding stability. Furthermore, the synchrotron X-ray adsorption spectroscopy results demonstrate that, the introduction of metal Ni phase could induce electronic interaction at the heterojunction interface, which plays a crucial role in the catalytic performance enhancement. Further, density functional theory calculations were carried out to reveal the mechanism of optimized conductivity and catalytic activity enhancement caused by interface effect. This work offers a generic interface engineering strategy for developing high-performance and cost-effective electrocatalysts toward OER, water splitting, and beyond.
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JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
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2022
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IF 6.76
Jiaqi Zhang,Quanhui Hou,Yanbing Liu,Xinglin Yang
The design of catalysts with excellent catalytic activity plays an important role in the field of solid-state hydrogen storage of new energy sources. Herein, a novel hydrangea-like NiO@NiMoO 4 composite catalyst was prepared through a facile hydrothermal reaction. Subsequently, NiO@NiMoO 4 was doped into MgH 2 by ball milling to solve the problems of high dehydrogenation temperature and slow desorption kinetics of MgH 2 . It can be seen from the experimental results that the MgH 2 + 10 wt% NiO@NiMoO 4 composite starts to dehydrogenate at about 190 °C, which is about 170 °C lower than that of pure MgH 2 . Meanwhile, after complete dehydrogenation, the composites can start to absorb hydrogen below 40 °C. Compared with pure MgH 2 , the activation energy of hydrogen absorption and dehydrogenation of the composite decreased by 47.6 kJ/mol and 46.5 kJ/mol, respectively. In 10th cycle tests, the MgH 2 + 10 wt% NiO@NiMoO 4 composite still has good cycle stability. After adding a small amount of biomass charcoal, the hydrogen storage capacity can even be maintained above 97%. Furthermore, the characterization results show that the in situ generated new species Mo and Mg 2 Ni/Mg 2 NiH 4 synergistically promote the adsorption and dissociation of hydrogen. This new synergistic mechanism provides new comprehensive insights for improving reversible hydrogen storage in MgH 2 .
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SOLAR ENERGY MATERIALS AND SOLAR CELLS
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2022
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IF 7.305
Ziheng Wu,Zhaochun Ye,Shasha Shi,Yaobing Fang,Li Li,Wenhui Yuan
Shape stability and excellent photothermal conversion performance are critical for composite PCMs in the field of solar energy utilization. This study prepares a nickel and cobalt-based bimetal organic framework (Ni–Co-BTC) which is further employed as the supporting material for 1-octadecanol (OD). The flower-like Ni–Co-BTC with an interconnected network exhibits large specific surface area, pore volume , and appropriate pore size distribution , which is conducive to the encapsulation of OD (up to 70 wt%). In addition, TiN nanoparticles are added to enhance the photothermal conversion performance of composite PCM. Therefore, the obtained OD/Ni–Co-BTC/TiN composite PCM exhibits considerable thermal energy storage capacity (145.8 J/g) and remarkable photothermal energy conversion efficiency (up to 97.75%). Furthermore, the composite PCM has outstanding thermal stability and reliability, and the phase change enthalpy is reduced by only 1.7% after 100 cycles. Accordingly, the composite PCM shows a promising application potential in solar energy harvesting , conversion and storage.
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JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
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2022
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IF 3.097
Yue Li,Xueai Li,Kexin Jin,Chunsheng Wang,Wanchun Guo,Kesong Tian,Haiyan Wang
The microwave absorbing materials (MAMs) applied in marine environment are confronted with corrosion, therefore, in order to guarantee the long-term function, the MAMs need to possess excellent microwave absorption performance and seawater corrosion resistance simultaneously. Carbonyl iron powder (CIP) has the characteristic of broadband response caused by magnetic loss, playing an important role in practical application as an MAM. Herein, to avoid the deterioration of microwave absorption property of CIP by seawater corrosion, protective layers of electroless plating Co(Ni) are introduced with less influence on magnetic loss. The CIP coated with Co layer (CIP@Co) shows the RL min of −57.93 dB and an effective absorption bandwidth (EAB) of 8.56 GHz, after a long-time continuous immersion in seawater, its RL min and EAB is −71.11 dB and 8.00 GHz, respectively. The EAB of CIP@Ni after immersing in seawater is also preserved 94 %, illustrating the long-life stability of the microwave absorption performance in seawater. The little effect of Co layer on the magnetic loss of CIP and the additional anticorrosion ability of electroless plating layers are two guarantees for enduring the excellent microwave absorption performance of CIP@Co in seawater. This work provides a solution to obtain MAMs with long-life excellent microwave absorption in seawater.
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JOURNAL OF ENVIRONMENTAL MANAGEMENT
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2022
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IF 8.91
Fang Guo,Yaoyin Lou,Qun Yan,Jianglei Xiong,Jiahao Luo,Chikang Shen,Dimitris V. Vayenas
For the efficient removal of the bio-refractory organic pollutants in the electronic industry wastewater, the Ni–Fe (oxides) modified three-dimension (3D) particle electrode was applied in electro-Fenton system (3D/EF), where iron ions were released from anode and deposited onto algal biochar (ABC) to prepare composite catalyst during reaction process. Firstly, scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and Brunauer-Emmett-Teller (BET) analysis were applied to confirm successful fabrication of the 3D particle electrode materials . Secondly, COD removal efficiency could reach about 80%, which was about 20% higher than that in 2D/EF system, under the optimized conditions as 2.0 g/L of Ni-ABC particle electrodes, initial pH of 3, 100 mL/min of aeration intensity and 20 mA/cm 2 of applied current density. Thirdly, characterized using three-dimensional fluorescence spectroscopy and GC-MS analysis, it seemed that most of the macromolecular substances could be degraded, whereas mono-2-ethylhexyl phthalate (MEHP) was identified as the most abundant and representative compound. Finally, possible degradation pathway of MEHP in 3D/EF system was proposed including dealkylation, cleavage of C–O bond, and demethylation. Therefore, this study provides a new strategy in designing EF system employing bimetal doped biochar composite for an efficient elimination of organic pollutants within electronic industry wastewater.
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PubMed
高影响因子
ACS Applied Materials & Interfaces
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2022
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IF 10.383
Sumbal Farid,Qing Mao,Suzhen Ren,Ce Hao,Xufeng Dong
Nanoscale pyrazolate-based coordination polymers (CPs) are becoming increasingly popular as electrocatalysts owing to their customizable compositions and structures. However, using them for oxygen evolution reaction (OER) is highly challenging due to their unsatisfactory catalytic efficiency and relatively low stability. Herein, a simple one-step solvothermal process was employed for the fabrication of polycrystalline nickel-pyrazolate [Ni(Pz)] with an unusual lamellar nanorod-assembled microsphere morphology for the first time using ethanol as a green organic solvent via controlling other physical parameters. Meanwhile, the Ni(Pz) structure and morphology are investigated to derive its formation process following the different monomeric feed ratios relying on the metal/ligand interactions of CP. Shaping the Ni(Pz) electrocatalyst in well-oriented lamellar nanorod-assembled microspheres brings the advantage of porosity and high specific surface area, which expedites mass/charge transport and contact with the electrolyte as well as creates less tortuous pathways for charge distribution, thus improving the charge homogeneity. These high-class structural features and polycrystalline nature of Ni(Pz)-E-PVP facilitate amazing catalytic OER activity with a low overpotential of 290 mV at 10 mA cm–2 and a Tafel slope of only 94 mV dec–1 beyond the yardstick material (i.e., RuO2) in alkaline solution. A suite of measurements, entailing X-ray photoelectron spectroscopy and density functional theory calculations, suggest that the rich Ni–N4 moieties in Ni(Pz)-E-PVP are central species providing adsorption sites for OER intermediates. This facile protocol is prophesied to commence the imminent development of noble metal-free, effective, and low-priced electrocatalysts for OER.
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PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2022
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IF 6.371
Lumeng Wang,Daoxin Liu,Zhongfeng Zhang,Ye Li,Jingru Liu,Yang Yang,Bing Xue,Fangfei Li
As one of the most efficient, low-cost, and readily available electrocatalysts for oxygen evolution reaction (OER) in alkaline environments, the nickel-iron electrocatalyst is of great significance to commercial water splitting. In this study, NiFe-layered double hydroxide loaded on nickel foam (NiFe-LDH/NF) was synthesized via a simple one-step hydrothermal method , whose OER catalytic performance could be successfully optimized by further electrochemical reconstruction. The results show that NF is an effective precursor to loading crystallized Ni(OH) 2 nanoparticles during hydrothermal synthesis, leading to the generation of high-performance NiOOH during OER reconstruction. Under the optimal Ni:Fe feeding ratio, Ni 2 Fe 1 -LDH/NF requires an ultra-low OER overpotential of 239 mV at 50 mA cm −2 and 260 mV at 100 mA cm −2 , whose Tafel slope is only 64.1 mV dec −1 . Impressively, Ni 2 Fe 1 -LDH/NF also achieves an ultra-low voltage of 1.44 V at 10 mA cm −2 with excellent long-term stability for overall water splitting. Unlike the previous viewpoint that only Ni species dominate surface reconstruction of NiFe-LDH, in this article the decisive influence related to Fe species on the reconstruction layers’ activity and stability is confirmed by electrochemistry, Raman, and XPS analysis during reconstruction process. During OER reconstruction, the surface Ni:Fe ratios can be "self-adaptively" regulated to an appropriate region, thus the stable reconstruction layers rich in NiOOH can be formed as the protective shells for NiFe-LDH. Furthermore, such "self-adaptive" reconstruction, assisted with appropriate initial Ni:Fe feeding ratios, can also stimulate more Ni 3+ active sites for OER, benefitting the outstanding catalytic performance of NiFe-LDH/NF for overall water splitting and prospective large-scale application.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2022
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IF 7.139
Chongjie Zhang,Xiang Xu,Niyu Yao,Chunhao Wang,Juan Guan,Zheng Zeng,Liqing Li
Environmental problems caused by the utilization of fossil energy are becoming more and more serious, so now more attention has been paid to the use of renewable energy. Pyrolysis of biomass is a method that convert biomass energy into hydrogen, but this method is subject to the performance of the catalyst for the pyrolytic reaction. In this study, NiCo 2 O 4 was synthesized by coprecipitation method and examined by microstructure and textual characterizations. The ability of NiCo 2 O 4 to pyrolyze toluene and produce hydrogen was evaluated by temperature-programmed experiment and lifetime test. It was found that the sample could pyrolyze toluene at the concentration of 1500 ppm at 300 °C with a hydrogen production of 0.6%, suggesting toluene was completely pyrolyzed. In the longevity test, toluene can be completely pyrolyzed for at least 5 h at 400 °C, with a high hydrogen yield of above 80% maintained during the pyrolysis process. As the pyrolysis reaction progresses, NiCo 2 O 4 was gradually reduced to nickel-cobalt alloy by hydrogen from the pyrolysis of toluene, indicating the actual active site of nickel-cobalt alloy. This study gives a hint for developing a good catalyst for the ultra-low temperature biomass pyrolysis to produce hydrogen.
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Sustainable Energy & Fuels
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2022
·Vol. 6
·期 18
·4183-4196
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IF 6.813
Shuai Wang,Yanxiu Liu,Mei Zhang,Feng Li,Yanguang Chen,Hua Song
Aqueous-phase hydrodeoxygenation (HDO) of biomass-derived phenolic compounds is considered as one of the most promising ways to convert biomass into fuels and value-added chemicals. The aim of this study is to develop highly active and water-resistant catalysts with a low price. For this purpose, with cheap transition Ni as the active phase, supported Ni@C/MxOy(x) and Ni@C/Al2O3(5)-glucose catalysts (MxOy stands for ZrO2, CeO2, TiO2 or Al2O3 and x represents Ni loading) were prepared from Ni-MOF-74/MxOy (x). The prepared catalysts were characterized by TG, H2-TPR, XRD, BET, HRTEM, XPS and NH3-TPD. The effect of the support, Ni loading and glucose incorporation on the HDO performance of phenol was investigated. The results showed that the Ni@C/Al2O3(5) catalyst with Al2O3 as the support and a low Ni loading of 5% exhibited the best HDO activity. The superior performance with such a low Ni loading greatly reduced the cost of the catalysts. Furthermore, the total yield of the deoxygenated product over Ni@C/Al2O3(5) was increased by 22.3% after the incorporation of glucose when the molar ratio of phenol/water was 1 : 1.25. In addition, the fixed-bed reactor experiment revealed that the HDO performance of Ni@C/Al2O3(5)-glucose almost remained stable during 48 h on-stream operation, indicating its excellent stability.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2022
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IF 4.326
Ying Liu,Lei Zhang,Shixiang Feng,Xi Chen
A series of RuNi bimetallic catalysts supported on activated carbon were prepared to study the reductive amination of lactic acid. Among the tested catalysts, the catalyst containing 40% Ni and 60% Ru was selected as the optimal catalyst. The yield of alanine significantly increased to 64% using the Ru6Ni4 catalyst supported on an activated carbon, which was 1.5 times that using the monometallic Ru catalyst supported on an activated carbon. A number of characterization methods such as transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and temperature-programmed reduction (TPR) were used to characterize monometallic and bimetallic catalysts. The strong electron transfer between Ni and Ru and the highly dispersed structure of metal on the surface of the support contributed to the excellent catalytic performance of Ru6Ni4. The Ru6Ni4 catalyst supported on activated carbon also exhibited good activity in the reductive amination of other α-hydroxyl acids to corresponding amino acids.
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BIOMASS & BIOENERGY
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2022
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IF 5.774
Yanlin Xu,Zhuoyi Liu,Bin Liu,Bin Dong,Yichuan Li,Yanpeng Li,Hailing Guo,Yongming Chai,Chenguang Liu
Pulping black liquor is a serious source of water pollution worldwide, which is very difficult to subsequently treat. Lignin is the main component of the black liquor and is the only natural aromatic recyclable resource, which is burnt as waste in the Kraft pulping industry. Designing an efficient lignin conversion catalyst that suitable for the strong alkaline environment of black liquor harbors tremendous carbon-neutral potential but still remains a scientific and technological challenge. In this work, the strong alkaline environment of black liquor was simulated, and low-cost pretreated Ni/AC catalysts were adopted to the hydrodeoxygenation (HDO) of a lignin model (guaiacol), and a breakthrough was achieved in the efficient transformation of lignin compound into hydrocarbons. By multitechniques, (e.g., FT-IR, XPS , Boehm titration, HRTEM), the relevance between introducing functional acid groups and the surface properties of catalysts was revealed. It is found that the increased acidic groups are responsible for the enhanced C (sp2) -O cleavage reactions, while improving the dispersion of Ni NPs and thus enhance the HDO efficiency. It is worth noting that better selectivity of benzene and lower hydrogen consumption are achieved on Ni/NOAC during the HDO process. Furthermore, the reaction routes of guaiacol on catalysts with different functional acid groups were proposed. This work provides guidance for efficient utilization of lignin in waste black liquor, and is of great significance to the development of sustainable carbon-neutral biorefinery and environmental protection.
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