JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Baosong Li,Dandan Li,Jun Zhang,Wei Chen,Weiwei Zhang
The incorporation of TiN and Y 2 O 3 nanoparticles together into Ni-W matrix have been investigated by pulse electrodeposition in present study. The microstructural, surface properties and corrosion resistance of Ni-W/TiN-Y 2 O 3 nanocrystalline coating have been studied. It illustrated that the electrodeposited coatings have dense and nodular structure without defects. Results confirmed that TiN and Y 2 O 3 particles were uniformly embedded in the composites. The embedded particles could improve the hardness and anti-corrosion properties of the obtained coating. The crystallite size calculated based on the preferred orientation (111) plane was of 14–17 nm, illustrating the formation of nanocrystalline structure. The mean R a value was about 84.6 nm. Electrochemical impedance tests revealed that the preferred combination of operating parameters for optimum corrosion resistance was 70%, 1000 Hz, 40 min and 4 A dm −2 . However, the best hardness and anti-wear properties were obtained at parameters of 50%, 500 Hz, 6 Adm −2 and 60 min. The extreme values of hardness and corrosion resistance were not realized simultaneously. The operating parameters should be kept in a certain balance to avoid the formation of inferior properties in any aspects of the coating; then the other performance advantages could be brought into full play. The preferred combination of operating parameters was optimized to be duty cycle of 70%, frequency of 1000 Hz, duration time of 40 min and average current density of 4 Adm −2 , which enabled the electrodeposited coating optimum corrosion resistance and high mechanical properties .
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高影响因子
FUEL
·
2019
·
IF 5.128
Ze Zhang,Jun Cheng,Yi Qiu,Xi Zhang,Junhu Zhou,Kefa Cen
To clarify the conversion mechanism of methyl palmitate (C16:0) to produce jet biofuel over Ni/desilicated meso-Y zeolite catalyst, quantum chemistry calculation and verification experiments were conducted to evaluate three proposed competitive reaction pathways, in which hydrodecarboxylation pathway was more feasible than hydrogenolysis and decarboxylation pathways. It was found that overall enthalpy change to produce pentadecane (−130.2 kJ/mol) in hydrodecarboxylation pathway was lower than that to produce palmitic acid (−90.1 kJ/mol) in hydrogenolysis pathway and that to produce hexadecane (−68.6 kJ/mol) in decarboxylation pathway. The experimental results of hydrodeoxygenation and hydrocracking conversion of methyl palmitate into jet biofuel were consistent with quantum chemistry calculation, when conventional Y zeolite was modified into hierarchical mesoporous Y zeolite catalyst by desilication with NaOH and then loading Ni nanoparticles. The jet biofuel product selectivity reached a peak (64.8%) with reasonable composition distributions, when Ni/meso-Y zeolite was desilicated with 0.4 M NaOH to promote BET surface area (554.9 m 2 /g) and specific pore volume (0.340 cm 3 /g) with 2–10 nm mesopores. The relative content of pentadecane in liquid products was always higher than those of palmitic acid and hexadecane over Ni/meso-Y zeolite catalysts desilicated with various concentrations of NaOH. The main compositions of gas phase by-products in hydrodeoxygenation and hydrocracking conversion were CH 4 with selectivity up to 25.2% and CO 2 with selectivity of ∼10%, which agreed well with quantum chemistry calculation results.
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APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Fu Yang,Bo Shao,Xianfeng Liu,Shuying Gao,Xu Hu,Man Xu,Yun Wang,Shijian Zhou,Yan Kong
Multiple catalytic active centers tactically generated on the 2-dimentional catalytic carrier could afford certain promoting function thanks to their existed special synergy. Herein, Ni-based nanosheet-like metasilicate catalytic materials were developed as heterogeneous catalysts towards styrene oxidation for the first time. Concurrently, the special heteroatom cobalt or magnesium-incorporated Ni-based nanosheet-like metasilicate were developed together via the proposed synthesis tactics. The resulted sheet-like nanomaterials were meticulously characterized and identified through valid techniques. The introduction of heteroatom metal elements of cobalt or magnesium incorporated in the Ni-based nanosheet-like metasilicate was proven to trigger the regulated catalytic effect including positive and negative aspects towards styrene oxidation, and their function was identified and understood based on the reaction exploration results, in which the present cobalt significantly give rise to the promotive catalytic conversion activity and selectivity towards styreneoxide(conversion 96.8%, selectivity 78.4%), while the magnesium oppositely induced the restraining catalytic capacity(conversion 72%, selectivity 51.3%) on the Ni-based metasilicate compared with pure one. The obtained heterogeneous Ni-based metasilicate retain durable catalytic activity during five recycling for styrene oxidation and inherit the regulated catalytic performance in the substrate expansion.
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高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2018
·Vol. 30
·期 3
·563-572
·
IF 2.137
Xiang Dong,Ruxiang Qin,Shibin Nie,Jinian Yang,Chi Zhang,Wei Wu
Reducing the fire hazard of polypropylene (PP) is an important research direction in the fields of fire safety materials. In this article, a novel Ni-containing char-forming agent (TTPN) was successfully synthesized, using tris(2-hydroxyethyl) isocyanurate (THEIC), terephthalic acid, and nickel dihydrogen phosphate. Then, TTPN was combined with the silica-gel microencapsulated ammonium polyphosphate (OS-MCAPP) to prepare intumescent flame retardant PP composites. From the results of the limiting oxygen index (LOI) test and cone calorimeter, the composite containing 30% IFR (OS-MCAPP: TTPN = 3:2) shows the highest LOI value of 33.5%, and its peak heat release rate is 275.5 kWm −2 , decreased by 79.0% and 37.4% than those of pure PP and the composite containing the char-forming agent without Ni. Meanwhile, the composite containing TTPN present the best smoke and CO 2 /CO suppression. The results indicate that TTPN has an excellent ability to dramatically reduce the fire hazard of PP.
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JOURNAL OF MATERIALS RESEARCH
·
2019
·Vol. 34
·期 14
·2445-2455
·
IF 1.982
Uwamahoro Evariste,Guohua Jiang,Bo Yu,Yongkun Liu,Zheng Huang,Qiuling Lu,Pianpian Ma
In this work, hierarchical mesoporous Zn–Ni–Co–S–rGO/NF microspheres have been prepared by hydrothermal, sulfurization, and subsequent calcination process. The effect of different sulfurization time on the morphology and capacitance of composites was tested. The high electrochemical performance of (Zn–Ni–Co–S–rGO/NF) composite was obtained when the sulfurization time was 3 h (Zn–Ni–Co–S–rGO/NF-3h), where a specific capacitance of 627.7 F/g at 0.25 A/g and excellent rate capability of about 97.8% capacitance retention at 2 A/g after 4000 cycles were achieved. Moreover, an asymmetric supercapacitor fabricated by (Zn–Ni–Co–S–rGO/NF-3h) composite and activated carbon (AC) as the positive and the negative electrodes, respectively, showed a high energy density of 75.96 W h/kg at a power density of 362.49 W/kg with a remarkable cycle stability performance of 91.2% capacitance retention over 5000 cycles. This incredible electrochemical behavior illustrates that the hierarchical mesoporous Zn–Ni–Co–S–rGO/N-3h microsphere electrodes are promising electrode materials for application in high-performance supercapacitors.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2019
·Vol. 26
·期 9
·8768-8778
·
IF 2.914
Sun Yufeng,Liu Zongtang,Fei Zhenghao,Li Changshun,Chun Yuan,Zhang Aimin
Fe-Ni bimetallic nanoparticles supported on CNTs (Fe-Ni/CNTs) were synthesized, characterized, and applied for removal of 2,4-dichlorophenol (2,4-DCP) in aqueous solution. The removal performance was enhanced drastically on Fe-Ni/CNTs with respect to monometallic Fe/CNTs. The synergistic effect between Fe-Ni nanoparticles and CNTs has been studied in detail. The research results indicated that the doping of Ni played an important role in promoting the catalytic degradation of 2,4-DCP. And the presence of CNTs not only could effectively reduce the aggregation of nanoparticles but also facilitate the mass transfer of 2,4-DCP and the formation of active atomic hydrogen during the catalytic process. In addition, the removal kinetics of 2,4-DCP by Fe-Ni/CNTs were in agreement with a pseudo-first-order model, and the rate constants were dependent on a number of factors including the initial concentration of 2,4-DCP, the dosage of Fe-Ni/CNTs, pH value of the solution, and doping amount of Ni. The degradation mechanism involved the adsorption by CNTs and catalytic reduction by Fe under the stimulating of Ni, and the preferred dechlorination followed the order of para-Cl > ortho-Cl. The study confirmed that Fe-Ni/CNTs had a potential to be a promising catalytic material for removal of chlorophenol and had a great prospect for practical application.
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PubMed
高影响因子
FUEL
·
2019
·
IF 5.128
Xiangping Li,Jianguang Zhang,Bin Liu,Juping Liu,Chuanbin Wang,Guanyi Chen
Non-noble metal(s)-based mesoporous catalysts are one of the promising catalysts for aqueous phase hydrodeoxygenation of lignin-derived phenols to produce hydrocarbons. In this paper, Ni/Al-SBA-15 was prepared through incipient wetness impregnation method and the performance of eugenol hydrodeoxygenation over Ni/Al-SBA-15 was studied. The effect of incipient wetness impregnant on the performance of eugenol hydrodeoxygenation over Ni/Al-SBA-15 was investigated. The materials were characterized by XRD, N 2 -sorption, TEM, FTIR, Py-FTIR, XRF and ICP-MS. In comparison with the traditional incipient wetness impregnation using water as solvent, the activity of Ni/Al-SBA-15 was significantly improved by using ethanol as solvent during the process of incipient wetness impregnation. For Ni/Al-SBA-15, the quantity of total acid was decreased after loading nickel species which was mainly due to the decrease of Lewis acid sites. The strength of Lewis acid in Ni/Al-SBA-15 prepare with ethanol as impregant was enhanced. The yields of propyl cyclohexane and propylbenzene from aqueous phase hydrodeoxygeation of eugenol over Ni/Al-SBA-15-E were increased. The super catalytic behavior of Ni/Al-SBA-15-E was attributed to the synergistic effect between the stronger Lewis acid sites and the intact framework structure of Ni/Al-SBA-15-E.
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Nanoscale
·
2019
·Vol. 11
·期 8
·3506-3513
·
IF 6.97
Manyi Gao,Yongsheng Yu,Weiwei Yang,Ji Li,Shichong Xu,Ming Feng,Haibo Li
The development of a robust and low-cost non-noble metal catalyst for photocatalytic H2 evolution is of great importance for practical applications. In this study, monodisperse Ni nanoparticles of controlled sizes were prepared by a facile method and anchored on graphitic carbon nitride (g-C3N4) nanosheets via a self-assembly route. The noble-metal-free Ni/g-C3N4 composite catalysts exhibit excellent photocatalytic activities for the hydrolytic dehydrogenation of ammonia borane (AB) under visible light. An optimum AB hydrolysis rate was obtained when the size of the Ni NPs was 3.2 nm, with an initial turnover frequency of 18.7 mol(hydrogen) mol(catalyst)−1 min−1 and an apparent activation energy of 36 kJ mol−1. This study provides validity for constructing high performance first-row transition metal nano-photocatalysts for the hydrolytic dehydrogenation of AB.
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高影响因子
CRYSTENGCOMM
·
2019
·Vol. 21
·期 9
·1416-1422
·
IF 3.382
Wen Zhou,Ming Zhou,Jingrui Hu,Hongmei Dong,Yingqing Ou,Lin Yang,Xijun Wei,Peng Xiao,Yunhuai Zhang
Shape-controlled synthesis of non-noble metal nanocrystals (NCs) is vital to their catalysis applications due to their different exposed surfaces and atomic coordination environments. Here, we report a facile synthesis of Ni nanocubes and cuboctahedra with controlled shapes and high yields via a wet-chemistry strategy. The key to success relies on the use of cetyltrimethyl ammonium bromide (CTAB), formaldehyde (HCHO) and a specific reaction temperature, which could effectively cap the desired surface and tune their growth rate. Specifically, nanocubes switched to cuboctahedra and octahedra with an increased reaction temperature due to gradual CO desorption from the surfaces of NCs. Meanwhile, it should be worth noting that CTAB and the generated CO molecules through HCHO decomposition would co-adsorb on the {100} facets of Ni NCs. As a proof-of-application, the obtained Ni NCs exhibited high activity in the oxygen evolution reaction (OER) with over-potentials of 383 mV and 402 mV for nanocubes and cuboctahedra at a current density of 10 mA cm−2, respectively, demonstrating that the {100} facets are more favorable toward OER. These results suggested that their performance is strongly shape dependent and is derived from different surface energies and active sites.
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INTERNATIONAL JOURNAL OF ENERGY RESEARCH
·
2018
·Vol. 43
·期 1
·430-438
·
IF 3.009
Xiuman Wang,Qian Zhang,Xiaofeng Shi,Ning Wang,Yujun Chai
Summary To analyze the effect of Co and Ni on hydrogen generation in water, the reactions of Mg and Al with water in CoCl 2 and NiCl 2 solutions are studied in terms of amount of H 2 produced and rate of reaction. Mg rapidly reacts with water in CoCl 2 and NiCl 2 , producing high amount of H 2 without induction time. While there is a short induction time is detected for Al─H 2 O reaction in CoCl 2 and NiCl 2 . In addition to the galvanic cell behavior of the Mg (Al)/Co (Ni) compounds formed, Co and Ni catalyze the hydrogen production reaction; however, the agglomeration of Co or Ni leads to a noticeable decrease in H 2 production. The open-circuit potential in CoCl 2 and NiCl 2 solutions after the addition of Mg or Al at ambient temperature shows an obvious change, coinciding with the initiation of the hydrogen generation process. Mg rapidly reacts with water in Co (Ac) 2 , CoSO 4 , Ni (Ac) 2 and NiSO 4 solutions as a consequence of its intrinsic metallic properties and of the formation of Co or Ni. The hydrogen production amount is lower (<200 ml g −1 ) in Co (NO 3 ) 2 and Ni (NO 3 ) 2 , even after adding NaCl. No reaction occurs when adding Al in CoSO 4 , Co (Ac) 2 , Co (NO 3 ) 2 , NiSO 4 , Ni (Ac) 2 , and Ni (NO 3 ) 2 . The synergistic effect of Co, Ni, and anion ions in water affects the rate of Al or Mg corrosion and hydrogen generation.
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2018
·
IF 2.829
Jinqiong Xu,Tingting Chen,Xiujuan Qiao,Qinglin Sheng,Tianli Yue,Jianbin Zheng
A novel non-enzymatic electrochemical sensor based on gold nanoparticles/nicke hydroxide nanosheet (AuNPs/Ni(OH) 2 NS) nanocomposite was successfully fabricated and further used for glucose sensing. The morphology and composition of AuNPs/Ni(OH) 2 NS were characterized by scanning electron microscopy, transmission electron microscopy, energy dispersive X-ray spectroscopy, and X-ray diffraction. The electrochemical properties were evaluated through cyclic voltammetry and amperometric methods. The AuNPs/Ni(OH) 2 NS/GCE exhibited wide linear range (0.002–6.0 mM), a low detection limit (0.66 μM) and good reproducibility and stability. The sensor was successfully employed for glucose detection in food samples for which the sensor displayed high performance with excellent reproducibility and recovery in complex food materials.
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高影响因子
BIORESOURCE TECHNOLOGY
·
2018
·
IF 5.807
Leilei Dai,Yunpu Wang,Yuhuan Liu,Roger Ruan,Dengle Duan,Yunfeng Zhao,Zhenting Yu,Lin Jiang
Catalytic fast pyrolysis (CFP) of torrefied corn cob using Ni-modified hierarchical ZSM-5 catalyst was conducted in this study. The prepared catalysts were characterized by N 2 adsorption and desorption (N 2 -BET), X-ray diffraction (XRD), and temperature-programmed desorption of NH 3 (NH 3 -TPD). NaOH solution treatment resulted in the lower peak intensities of hierarchical ZSM-5 catalyst in the XRD patterns while Ni modification improved the catalyst framework. In addition, NaOH solution treatment created some mesopores or macropores, but the incorporation of Ni reduced BET surface area and volume of micropores. Though the addition of Ni lowered the acidity of catalyst, Ni-modified hierarchical ZSM-5 catalyst led to higher yields and of aromatic hydrocarbons. What is more, hierarchical ZSM-5 catalysts significantly improved the selectivities of mono-aromatics. Kinetic analysis shows that CFP of torrefied corn cob was second-order reaction and the addition of Ni can obtain a lower activation energy compared with hierarchical ZSM-5 catalyst.
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高影响因子
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