JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
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2018
·
IF 3.046
Xiaoshan Yang,Xiufang Cui,Guo Jin,Jinna Liu,Yanbo Chen,Zhe Liu
Laser additive manufacturing (LAM) is a novel method for processing compositionally graded alloys and becomes increasingly important in the context of next-generation manufacturing technology. In this work, (Fe 60 Co 35 Ni 5 ) 78 Si 6 B 12 Cu 1 Mo 3 soft magnetic alloys with different laser power were designed and processed by the LAM. The magnitudes of magnetic properties were analyzed, and the relationships among composition-microstructure-magnetic properties assessed. Results show that the (Fe 60 Co 35 Ni 5 ) 78 Si 6 B 12 Cu 1 Mo 3 alloys by LAM exhibits relative uniform microstructure and comparable magnetic property compared with those conventional processed alloys. The bcc dominated microstructures exhibit a substantially higher saturation magnetization (Ms). With the increase in power, the average grain size of the alloy increased slightly and the increasing volume fraction of the Fe Si phase leaded to the enhancement of magnetization. The (Fe 60 Co 35 Ni 5 ) 78 Si 6 B 12 Cu 1 Mo 3 alloys with laser power of 3000 W exhibits the highest Ms (199 emu/g). The appearance of Fe 3 B results in coarse dendrites and high coercivity (Hc) in the multiple re-heating cycles.
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JOURNAL OF ELECTRONIC MATERIALS
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2018
·Vol. 48
·期 4
·1840-1845
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IF 1.566
Sun Fu-Hua,Dong Jinfeng,Tang Huaichao,Zhuang
Hua-Lu,Li Jing-Feng
Cu 12 Sb 4 S 13 tetrahedrite is an abundant natural that is also environmentally friendly. There have been efforts made to reach a unity of ZT value through optimizing the interdependence of electrical and thermal performance. In this study, we reported on ZnO nanoparticles-dispersed Cu 11.5 Ni 0.5 Sb 4 S 13− δ composites that were synthesized by the mechanical alloying and spark plasma sintering method. The structural characterizations were conducted via scanning electron microscopy, electronic probe microscopic analysis and transmission electron microscopy. The ZnO-nanoparticles were uniformly distributed in the Cu 12 Sb 4 S 13 grains. ZnO was used as a heterogeneous nucleation site to reveal the effectiveness of reducing thermal conductivity, likely derived from the strong low/mid-frequency phonon scattering. The lowest lattice thermal conductivity, 0.33 W m −1 K −1 , was obtained at 673 K in 0.5 vol.% of ZnO sample. A small quantity of ZnO addition led to a high ZT ∼ 1.0 at 723 K, which increased by ∼ 42% in the pure-phased Cu 12 Sb 4 S 13− δ sample.
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Nature Energy
·
2018
·Vol. 3
·期 12
·1067-1075
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IF 46.859
Gao Wenbo,Guo Jianping,Wang Peikun,Wang Qianru,Chang Fei,Pei Qijun,Zhang Weijin,Liu Lin,Chen Ping
Ammonia is a promising carbon-free energy carrier, but is currently synthesized industrially under harsh conditions. Synthesizing ammonia using lower temperatures and pressures could therefore improve its prospects as a chemical means to store and transport energy. Here we report that alkali and alkaline earth metal imides function as nitrogen carriers that mediate ammonia production via a two-step chemical looping process operating under mild conditions. Nitrogen is first fixed through the reduction of N 2 by alkali or alkaline earth metal hydrides to form imides and, subsequently, the imides are hydrogenated to produce NH 3 and regenerate the metal hydrides. The oxidation state of hydrogen therefore switches between −1 (hydride), 0 (H 2 ) and +1 (imide and NH 3 ). Late 3d metals accelerate the reaction rates of both steps. The chemical loop mediated by BaNH and catalysed by Ni produces NH 3 at 100 °C and atmospheric pressure.
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Journal of Materials Chemistry A
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2018
·Vol. 6
·期 25
·12098-12105
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IF 9.931
Qiang Zhang,Gang Peng,Jean Pierre Mwizerwa,Hongli Wan,Liangting Cai,Xiaoxiong Xu,Xiayin Yao
All-solid-state lithium batteries using nonflammable inorganic solid electrolytes can completely eliminate the safety issues, such as leakage and combustion. Moreover, energy densities can be improved significantly using transition metal sulfide electrodes and metallic lithium in all-solid-state lithium batteries owing to their high theoretical specific capacity and excellent interfacial compatibility with sulfide solid electrolytes. In this work, nickel sulfide anchored carbon nanotube (NiS–CNT) nanocomposites were successfully synthesized by a facile hydrothermal method. The very small NiS particle size with a distribution of 5–10 nm as well as the presence of multi-walled carbon nanotubes not only enhance the ionic/electronic conduction but also alleviate the volume changes, which endow the NiS–CNT based all-solid-state lithium batteries with superior rate capability and excellent cycling performances. Typically, Li/75% Li2S–24% P2S5–1% P2O5/Li10GeP2S12/NiS–CNT all-solid-state lithium batteries delivered a high reversible capacity of 515 mA h g−1 after 30 cycles at a current density of 0.1 A g−1. Even after increasing the current density to 1.0 A g−1, the all-solid-state lithium batteries still maintain a stable discharge capacity of 170 mA h g−1 after 150 cycles. Moreover, the conversion reaction mechanism of the NiS–CNT nanocomposites in all-solid-state lithium batteries was investigated by ex situ XRD measurements.
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ENERGY CONVERSION AND MANAGEMENT
·
2018
·
IF 6.377
Junguang Meng,Zengli Zhao,Xiaobo Wang,Anqing Zheng,Dongyan Zhang,Zhen Huang,Kun Zhao,Guoqiang Wei,Haibin Li
Ni/Fe bimetallic catalysts were synthesized on an olivine support using the wetness impregnation (WI) and thermal fusion (TF) methods, and catalytic cracking and steam reforming on different tar model compounds (phenol and naphthalene) were investigated in a fixed bed reactor. The effects of the reaction temperature and space-time on the catalytic cracking activity of phenol and naphthalene were tested, and the influences of steam on the carbon molar ratio (S/C) and different synthesized methods on the steam reforming of phenol and naphthalene were also studied. In addition, the carbon deposited on the catalyst was analysed using temperature program oxidation (TPO), Raman spectroscopy and transmission electron microscopy (TEM) methods. The elemental composition of the catalyst was analysed by X-ray fluorescence (XRF), and the physiochemical properties of the catalysts were characterized via X-ray diffraction (XRD), the BET surface area, scanning electron microscopy (SEM), TEM, Raman spectroscopy, temperature program reduction (TPR), and X-ray photoelectron spectroscopy (XPS). The results showed that the structure of TF-Ni/Fe/olivine changed considerably compared with that of calcined olivine (mainly the Mg 2 SiO 4 phase) and that a portion of Fe was fused into the olivine structure and reorganized into a new (Mg, Fe) Fe 2 O 4 phase. After reduction, the Ni-Fe alloy was detected on both catalysts, and the particle size of the Ni-Fe alloy on TF-Ni/Fe/olivine was smaller than that of WI-Ni/Fe/olivine. The TF-Ni/Fe/olivine cracked phenol into small-molecule gas (CO and H 2 ) and a small quantity of olefin. By contrast, phenol was polymerized to naphthalene in the absence of a catalyst. The phenol and naphthalene steam reforming conversion on WI-Ni/Fe/olivine were both higher than that of TF-Ni/Fe/olivine. A 100-h stability test of phenol steam reforming on TF-Ni/Fe/olivine and WI-Ni/Fe/olivine was conducted, and TF-Ni/Fe/olivine showed higher stability in the early stages of the experiment due to stronger interactions between the active sites and olivine support. The deposited carbon from naphthalene steam reforming was more difficult to eliminate because it contained more C β and C γ , which had higher degrees of graphitization.
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EUROPEAN POLYMER JOURNAL
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2018
·
IF 3.741
Xianfeng Que,Yurong Yan,Zhiming Qiu
Benzocyclobutene resins play an important role in microelectronic industry owing to their excellent physical and chemical properties. In our work, three novel benzocyclobutene-terminated imide monomers were synthesized via the reaction of 1-aminomethyl benzocyclobutene with various aromatic dianhydrides. The monomers exhibited good processability with superior solubility and low melting points (<163.5 °C), and they showed similar curing behaviors under N 2 with an exothermic peak in differential scanning calorimetry (DSC) curves ranging from 217.3 °C to 287.7 °C. Highly crosslinked resins obtained at 150–300 °C exhibited superior tensile strength (>74.3 MPa), outstanding thermal stability (T d > 466 °C in N 2 ), high glass transition temperature (>278 °C), high storage modulus (>3.25 GPa at 30 °C), low dielectric constant (<3.07 at 1 MHz) and good water resistance (the water absorption was below 0.81% after immersed in water for 24 h and the water contact angle was higher than 86.6°). Atomic force microscopy demonstrated the perfect uniformity and planarity of the cured films.
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RESEARCH ON CHEMICAL INTERMEDIATES
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2018
·Vol. 44
·期 12
·7861-7872
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IF 1.674
Ma Yuanyuan,Dong Jie,Yang Xiaowei,Niu Libo,Zhang Huiling,Bai Guoyi
A series of NiB- x ( x denotes as the molar ratio of hydrogelator:Ni) amorphous alloys were prepared using a hydrogelator, 2,4-(3,4-dichlorobenzylidene)- d -sorbitol (DCBS), as the controlling agent and were tested in the selective hydrogenation of benzophenone to benzhydrol. The effect of different amounts of DCBS addition on the activity of the NiB amorphous alloys was investigated. The addition of small amounts of DCBS during NiB preparation could markedly improve its activity. The conversion of benzophenone was 96.6% and the yield of benzhydrol can reach 82.0% under the optimal reaction conditions over the NiB-0.015 catalyst. The high activity of NiB catalysts is attributed to the regulation effect of three-dimensional networks formed by DCBS, which could inhibit the agglomeration of NiB particles during preparation and make them more dispersed, resulting in larger surface areas and more active Ni sites. The Brunauer–Emmett–Teller method, transmission electron microscopy, H 2 -chemisorption and temperature-programmed desorption of hydrogen measurements indicated these results.
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JOURNAL OF SUPERCRITICAL FLUIDS
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2018
·
IF 3.122
Chenyu Wang,Wei Zhu,Cheng Chen,Hao Zhang,Naixi Lin,Ying Su
Dewatered sewage sludge with different moisture contents was treated with a nickel catalyst in supercritical water in a batch quartz tube micro-reactor at different temperatures and reaction times. The catalytic activity of the nickel wire catalyst was investigated. Because of the gradual deactivation of the catalyst, the hydrogen yield decreased by 8–72% after five catalytic cycles. The temperature has the largest influence on the deactivation rate of the nickel catalyst. The decline rate of the hydrogen yield decreased from 67% to 8% when the temperature was increased from 400 °C to 500 °C. SEM, EDS and TPO were used to characterize the spent catalyst. The results showed that the deactivation of the nickel catalyst is caused by the deposition of char/coke on the catalyst surface. Finally, the relationship between the reaction conditions and catalyst deactivation was investigated from the viewpoint of the organic matter degradation pathway.
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DALTON TRANSACTIONS
·
2018
·Vol. 47
·期 48
·17276-17284
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IF 4.099
Chun Chen,Ruoyu Fan,Wanbing Gong,Haimin Zhang,Guozhong Wang,Huijun Zhao
Water is inevitably associated with the production of bio-derived platform molecules, but most supported metallic catalysts have poor water compatibility. Although there have been a great number of investigations regarding the hydrogenation of bio-derived unsaturated compounds in the organic phase, the reactions that proceed in water are still quite challenging. Herein, we report the synthesis of a supported nickel catalyst (Ni-LN650) by the reduction of the perovskite-type oxide LaNiO3 precursor at 650 °C. The derived catalyst affords attractive activity in the hydrogenation of furfural by using water as the reaction medium, in which furfural is completely converted into tetrahydrofurfuryl alcohol with the highest productivity of 289.7 mmol gNi−1 h−1 at 120 °C and 1 MPa of H2 within 5 h of reaction. The Ni-LN650 catalyst also exhibits good stability and renewability in a cycle test, stemming from the self-regeneration peculiarity of the perovskite-type oxide precursor. Moreover, the catalyst can also demonstrate high activity in the aqueous-phase hydrogenation of various aldehydes, alkenes and carboxylic acids in a series of experiments. Due to the merits of usability in water, the renewability and wide application scope, the Ni-LN650 catalyst can be treated as a promising candidate for the catalytic conversion of bio-derived platform molecules into high value-added fuels and chemicals.
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PubMed
高影响因子
BIORESOURCE TECHNOLOGY
·
2019
·
IF 6.669
Da Wang,Guangci Li,Chuanhui Zhang,Zhong Wang,Xuebing Li
Ni nanoparticles inlaid in lignin-derived carbon constructing the “inlaid type” Ni/C-I was reported to improve stability and adjust metal-support interaction of lignin hydrogenolysis catalyst. The Ni/C-I was further heat treated in air to prepare Ni/C-R so as to re-expose the blocked active sites by carbon species. A lot of characterization techniques were carried out to confirm the “inlaid structure” of the catalysts. The lignin depolymerization results demonstrated that the Ni/C-R had better catalytic performance than traditional “supported type” Ni/C, 23.3% aromatic monomer yield and 82.4% bio-oil yield were achieved. Moreover, the mechanism studies with lignin model compound revealed that Ni/C-R had better bond breaking ability than Ni/C, even C C bond could be cleaved. The electron effect could be responsible for that, since the electrons could transfer from Ni 0 to carbon support for Ni/C-R, which could improve the bond breaking ability.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Chengbo Wei,Chuan Liu,Linna Gao,Yanfang Sun,Qingyun Liu,Xiao Zhang,Jinxue Guo
Integrating heterogeneous hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) electrocatalysts into compatible composite catalysts with specific interfaces and structures holds great promise for the development of efficient bifunctional catalysts for overall water splitting. Herein, heterogeneous MoS 2 -Ni(OH) 2 catalyst supported by Ni foam (MoS 2 @Ni(OH) 2 /NF) is developed, in which the Ni(OH) 2 nanorod array is grafted with MoS 2 nanosheets . The hierarchical 1D/2D structures benefit not only the exposure of catalytic site but also the facilitated charge transfer. The heterointerfaces allow the synergism of electric structure modulation for improved catalytic activity and kinetics towards HER, OER, and overall water splitting. MoS 2 @Ni(OH) 2 /NF achieves a current density of 10 mA cm −2 at low overpotentials of 134 and 233 mV for HER and OER in 1 M KOH, respectively. Moreover, a cell voltage as low as 1.46 V is obtained to afford 10 mA cm −2 in a tow-electrode electrolyzer using MoS 2 @Ni(OH) 2 /NF as bifunctional catalysts, assuring it superior to most of the reported noble-metal-free bifunctional electrocatalysts. Such heterogeneous design of composite catalyst should shed light on the exploration of functional materials for energy applications.
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ChemSusChem
·
2018
·Vol. 12
·期 4
·944-954
·
IF 7.411
Shi Qiu,Xuan Guo,Yong Huang,Yunming Fang,Tianwei Tan
Graphical Lignin first : A flexible lignin-first biorefinery could be developed by task-specific catalyst design for hemicellulose retention or feedstock extension. Mo x C/carbon nanotube (CNT) is found to be a promising catalyst for the retention of hemicellulose by cleavage of the bonds between lignin and carbohydrates with high selectivity. Ru/CMK-3 achieves the extension of the feedstock for the lignin-first biorefinery from hardwood to softwood. A catalytic reductive fractionation method for lignocellulosic biomass, termed lignin-first biorefinery, has emerged, which emphasises preferential depolymerization of the protolignin. However, in most studies, the lignin-first biorefinery is only effective for hardwood that has a high syringyl/guaiacol (S/G) ratio of lignin building blocks, and the degradation of hemicellulose also takes place simultaneously to a certain degree. In this study, two task-specific catalysts were developed to realize hemicellulose retention and feedstock extension through the development of an objective performance–structure relationship. It is found that Mo x C/carbon nanotube (CNT) is highly selective in the cleavage of bonds between carbohydrates and lignin and ether bonds in lignin during the catalytic reductive fractionation of hardwood, leading to a carbohydrate (both cellulose and hemicellulose) retention degree in the solid product close to the theoretical maximum and a delignification degree as high as 98.1 %. Ru/CMK-3 is demonstrated to be effective in the catalytic reductive fractionation of softwood and grass, resulting from its weak acidity and high mesoporosity.
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