Nanoscale
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2022
·Vol. 14
·期 19
·7322-7331
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IF 8.307
Si-Qi Zhu,Jin-Cheng Shu,Mao-Sheng Cao
The upcoming 5G era will powerfully promote the development of intelligent society in the future, but it will also bring serious electromagnetic pollution. Thus, the development of efficient, lightweight and multifunctional electromagnetic shielding materials and devices is an important research hotspot around the world. Herein, a novel needlelike Co3O4/C array architecture is constructed from MOF precursor via a simple pyrolysis process, and its microstructure is controllably tailored by changing the pyrolysis temperature. The unique 3D hierarchical structure and multiphase components enable the architecture to provide high-efficiency electromagnetic interference (EMI) shielding, along with good thermal insulation. More importantly, the architecture possesses fast ion transport channels, which can be used to construct supercapacitors with high specific capacitance and excellent cycle stability. Obviously, this work offers a new inspiration for the design and construction of multifunctional electromagnetic materials and devices.
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高影响因子
JOURNAL OF CATALYSIS
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2022
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IF 8.047
Wenjun He,Rui Zhang,Jingyu Zhang,Fangqing Wang,Ying Li,Jianling Zhao,Cong Chen,Hui Liu,Huolin L. Xin
Developing cost-effective non-precious electrocatalysts with excellent HER performance in alkaline media is of significance for industrial hydrogen production . Herein, we successfully endow Ni 3 S 2 with unprecedentedly enhanced alkaline HER activities by introducing nickel vacancies. The Ni 3 S 2 catalyst with nickel vacancies exhibits an ultralow overpotential of 35 mV at 10 mA cm −2 in 1 M KOH electrolyte, outperforming commercial Pt/C (56 mV) and most reported non-precious electrocatalysts. The electron paramagnetic resonance and X-ray absorption fine structure etc. validates the formation of Ni vacancies and the change of the geometric/electronic structure of Ni 3 S 2 . Additionally, the theoretical calculations reveal that the Ni sites with higher valence state neighbouring the Ni vacancies can promote the water dissociation, playing a vital role in accelerating HER kinetics in alkaline media. This work may provide a universal strategy to enhance the HER activity of transition-metal compound catalysts in alkaline media by means of cationic defect engineering.
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Crystals
·
2022
·Vol. 12
·期 4
·469
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IF 2.67
Shao-Bo Guo,Wei-Bin Zhang,Ze-Qin Yang,Xu Bao,Lun Zhang,Yao-Wen Guo,Xiong-Wei Han,Jianping Long
Transition metal phosphide composite materials have become an excellent choice for use in supercapacitor electrodes due to their excellent conductivity and good catalytic activity. In our study, a series of nickel phosphide heterostructure composites was prepared using a temperature-programmed phosphating method, and their electrochemical performance was tested in 2 mol L−1KOH electrolyte. Because the interface effect can increase the catalytic active sites and improve the ion transmission, the prepared Ni2P/Ni3P/Ni (Ni/P = 7:3) had a specific capacity of 321 mAh g−1under 1 A g−1and the prepared Ni2P/Ni5P4(Ni/P = 5:4) had a specific capacity of 218 mAh g−1under 1 A g−1. After the current density was increased from 0.5 A g−1to 5 A g−1, 76% of the specific capacity was maintained. After 7000 cycles, the capacity retention rate was above 82%. Due to the phase recombination effect, the electrochemical performance of Ni2P/Ni3P/Ni and Ni2P/Ni5P4was much better than that of single-phase N2P. After assembling the prepared composite and activated carbon into a supercapacitor, the Ni2P/Ni3P/Ni//AC had an energy density of 22 W h kg−1and a power density of 800 W kg−1and the Ni2P/Ni5P4//AC had an energy density of 27 W h kg−1and a power density of 800 W kg−1.Keywords:nickel phosphide heterostructure;electrochemical pseudocapacitance;temperature programming;supercapacitor
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INTERNATIONAL JOURNAL OF COAL GEOLOGY
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2022
·
IF 6.3
Yanan Yang,Ningning Zhong,Jia Wu,Yueyang Pan
Under hot, deep-basin conditions, hydrogen-to-carbon ratios of residual kerogen are low. Whether ubiquitous water in sedimentary environments contributes hydrogen directly to hydrocarbon gas formation through organic-inorganic interactions is, therefore, critical for natural gas generation. Accordingly, we conducted laboratory experiments on immature to overmature kerogens at 300–600°C and 700 bar to examine the chemical interactions between kerogens and fluid under varying redox states and hydrothermal conditions. Mineral buffers, comprised of magnetite-hematite, nickel‑nickel oxide, cobalt‑cobalt oxide, and molybdenum‑molybdenum trioxide, were added to the experiments to control the redox state of the fluid from geologically reasonable to generally excessive values. The kerogens and mineral buffers were spatially isolated using double-capsule techniques to prevent contact catalysis. Our results indicated that chemical interactions between kerogens and water depended strongly on the kerogen thermal maturity and fluid redox state. The chemical interactions of overmature kerogens with reducing water were stronger than those of immature kerogens, which could be ascribed to the weaker competitive transfer of hydrogen from organics to organics than from water to organics. Unexpectedly high amounts of hydrocarbon gas were generated by incorporating water-derived hydrogen in the pyrolysis of overmature kerogens, and the yields increased under low to high reducing fluid conditions for a given temperature. Along with the increasing thermal maturity, residual kerogen eventually became ineffective for hydrocarbon gas generation through reduction reactions. Demethylation, bridge bond cleavage reaction, aromatic structure ring opening reactions in residual kerogen and subsequent redox reaction of intermediate products with reducing fluids is evidenced as the possible reaction mechanisms. The produced hydrocarbon gas under f H 2 level of oilfield water is characterized by high dryness (99 mol%) and more-enriched 13 C in CH 4 compared with precursors. Natural gas deep within the Sichuan and Appalachian basins with similar characteristics suggests that our simulated organic–inorganic interactions could occur widely under natural conditions. Consequently, a potentially prolific source of natural gas may be formed by the overmature source rocks in the deep basin and fluid redox should be considered for gas potential evaluation of overmature source rocks.
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MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
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2022
·
IF 6.044
Meng Guo,Kai Liu,Jingjia Sun,Dongdong Gu
Due to the thermal cycling effects of layer-by-layer deposition in laser powder bed fusion process (LPBF), the coarse columnar grains with an epitaxial growth along the building direction are prone to form in LPBF-processed pure tungsten (W), thereby causing cracking and reduced formability. Here, the nanoparticles of Ni (1 wt%) and Fe (1 wt%) were introduced in W-matrix and a novel W-Ni-Fe alloy with nearly full densification was fabricated by LPBF. The laser-tailored microstructures transformed from coarse columnar grains to fine equiaxed grains with the addition of nano-Ni and nano-Fe. The LPBF-printed W-Ni-Fe had a considerably high compressive strength of 2638 MPa and a strain of 46%, showing about 185% and 475% improvement, respectively, as relative to the pure W under the same LPBF conditions. This work provided a feasible nano-modification method to fabricate high-performance W-alloys by laser additive manufacturing .
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Food Science & Nutrition
·
2022
·Vol. 10
·期 6
·1841-1853
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IF 3.553
Jun Yang,Shulin Hu,Anqi Liao,Yetian Weng,Shuli Liang,Ying Lin
Current chemical analysis approaches for contaminants have failed to reveal their biotoxicity. Moreover, conventional bioassays are time consuming and exhibit poor repeatability. In this study, we performed the acute toxicity detection of various contaminants (chromium (Cr), cadmium (Cd), lead (Pb), arsenic (As), mercury (Hg), tin (Sn), nickel (Ni), and bisphenol A (BPA)) with four bioluminescent bacteria ( Vibrio qinghaiensis Q67, V. fischeri , Photobacterium phosphoreum T3, and P. phosphoreum 502) using a rapid, flexible, and low-cost bioassay. We found that the temperature affected the bacterial luminescence, and freeze-dried cells exhibited sensitive toxic responses to contaminants. Indeed, the optimized protectants containing 12% (w/v) trehalose, 4% sucrose, and 2% sorbitol displayed better luminescence and toxic sensitivity. Furthermore, freeze-dried powders of these strains were prepared and subjected to acute toxicity detection. The results showed that all contaminants exhibited acute toxicity toward Q67, but the other strains did not show obvious response to nickel and tin. The relative half-maximal effective concentration (EC 50 ) values of BPA, Cr, Cd, Pb, As, Hg, Ni, and Sn to Q67 were 0.674, 1.313, 11.137, 5.921, 4.674, 0.911, 5.941, and 54.077 mg/L, respectively. In addition, the EC 50 values of contaminants toward different strains were suggested to be statistically significant. Freeze-dried Q67 exhibited toxic responses to more contaminants than the other bioluminescent strains; therefore, Q67 was selected to be more suitable than the other strains for single and mixture toxicity detection tests. Compared with other strains, Q67 was more appropriate for the rapid screening of the mixture toxicity of contaminants in samples as a nonspecific screening sensor before the use of standard analysis approaches.
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MACROMOLECULAR MATERIALS AND ENGINEERING
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2022
·Vol. 307
·期 9
·2200144
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IF 4.402
Bin Yang,Ning Jia,Xiaohong Wang,Yang Pan,Mengning Luo,Xinya Chen,Ru Xia,Zhengzhi Zheng,Jiasheng Qian,Yuchao Ke,Lifen Su,Yirong Fang
In this work, epoxy (EP) resin composites with “point-surface” heterostructures constructed by hybrid fillers of Ni particles and graphene nanosheets (GNPs) are prepared via a blending method under magnetic field. Effects of filler content and magnetic orientation on dielectric, thermally and electrically conductive, and thermomechanical properties of the resultant composites are investigated. The findings disclose that the synergistic effect of hybrid fillers and the magnetic orientation result in the formation of a complex heterogeneous network structure, significantly improving both thermal and electrical conductivities. From the temperature distribution analysis, it is the construction of the heterogeneous network that improves the thermally conductive and thermomechanical properties. Sample Y4 (containing 28 wt% Ni and 2 wt% GNP) displays an average heating rate (AHR) of 152.4 °C min −1 and has an out-of-plane thermal conductivity of 0.930 W m −1 K −1 (267.6% higher than that of neat EP). The infrared thermal imaging (ITI) together with SEM observations further confirms that the Ni chains in situ formed under a magnetic field are responsible for the improved composite's thermal conductivity and thermal management capability, which make it potentially applicable for 3D packaging materials in power-intensive electronic components.
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Materials Today Chemistry
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2022
·
IF 7.613
Q. Yang,J. Liu,C. Zhou,J. Ni,E.I. Vovk,Y. Yang,B. Yang,X. Guan
Dry reforming of methane (CH 4 ) with carbon dioxide (CO 2 ) is an attractive technology for producing value-added syngas and mitigating greenhouse gas emission. However, this process usually requires high energy input due to the intrinsic inertness of CH 4 and CO 2 . Besides, the widely investigated solid Ni-based catalysts typically suffer from coking and sintering issues, leading to degradation in catalytic performance. Liquid alloys and molten salts are emerging as promising catalytic materials for CH 4 dry reforming. In this work, we combine electrolysis with thermocatalysis for CH 4 dry reforming in a naturally stratifying liquid alloy-salt system, which achieves effective and stable catalytic performance under relatively mild operation conditions. The conversions of CH 4 and CO 2 reach 37% and 95%, respectively, in a bubble column reactor comprising Ni–Bi alloy and LiNaCO 3 during constant current electrolysis at 1.5 A and 900 °C. The selectivities of H 2 and CO were maintained at 85% and 92%, respectively. Ab initio molecular dynamics simulation shows that the oxides of both Ni and Bi promote the C–H bond dissociation. Therefore, the electrochemical process combine electrolysis with thermocatalysis in the liquid alloy-salt system represents a promising approach to achieving effective and stable CH 4 dry reforming.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2022
·
IF 4.598
Xiaoyue Liu,Hongtao Xie,Jian Mao
The porous electrodes derived from Prussian blue analogs (PBAs) show high specific capacity and superior energy densities in supercapacitors due to their tunable chemical compositions, open three-dimensional network framework and large surface area. In this work, La-Fe PBA with different morphologies is prepared at mild conditions via controlling the composition of mixed solvent and the structural evolution of the La-Fe PBA is further explored. The solubility of K 3 [Fe(CN) 6 ] and the influence of ethanol on the crystal growth is used to control the synthesis of La-Fe PBA. Four different morphologies of La-Fe PBA, such as chamfered hexagonal bipyramid microcrystals, hexagonal flakes, erythrocyte-like microstructure and small flakes, are successfully synthesized by changing the ethanol/water ratio of mixed solvent. The porous LaFeO 3 with the same shape is obtained by calcining the La-Fe PBA at 500 °C, which is subsequently employed as electrodes for battery-type supercapacitor. The erythrocyte-like LaFeO 3 shows remarkable specific capacity (330 C g −1 ) at 1 A g −1 , energy density (23.8 Wh kg −1 ) and power density (400 W kg −1 ) at 1 A g −1 . This work could provide a porous material for high-performance supercapacitors as well as an exciting strategy to develop and design materials with specific morphology.
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FUEL
·
2022
·
IF 8.035
Zhi Hu,Aidi Xie,Chun Chen,Zidan Zou,Yue Shen,Zhen Fu,Yunxia Zhang,Haimin Zhang,Huijun Zhao,Guozhong Wang
Aqueous-phase hydrogenation-rearrangement tandem (AP-HRT) reaction is a green and sustainable route to produce cyclopentanone from bio-based furan compounds. Herein, the ionic liquid was applied as the precursor to synthesize Ni@NP-C catalyst, which contains high dispersed nickel nanoparticles (Ni NPs) encapsulated in the N, P co-doped carbon layer , for the selectivity transformation of furfural towards cyclopentanone. The synthesized Ni@NP-C catalyst can afford 100% FAL conversion and 86.7% CPO yield at 130 °C and 1.5 MPa H 2 within 2 h AP-HRT reaction. The introduction of the electronegative heteroatom on the surface can not only improve the adsorption of reactant but also provide weak Lewis Acid sites for being beneficial to the high selectivity of cyclopentanone. The catalyst displays superior activity, selectivity, and stability in the tandem catalytic system in view of the tunable chemical states of the doped heteroatoms by handily adjusting the pyrolysis temperature.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2022
·
IF 7.139
Riyang Shu,Linxuan Zhou,Zhengchen Zhu,Bowen Luo,Hongyun You,Zhuojie Zhong,Yao He
Enzymatic hydrolysis lignin is a kind of byproduct from the biorefinery process, and hydrogenolysis is a promising approach to valorize the lignin waste. This work proposed an efficient hydrogenolysis of enzymatic hydrolysis lignin over in situ prepared RuNi/C bimetallic catalyst . RuNi/C catalyst exhibited a much higher catalytic activity than Ru/C catalyst with the addition of Ni species. A series of characterizations were carried out to reveal the synergistic effect of the bimetallic catalyst . The results indicated that the interaction between Ru and Ni formed an electron transfer from Ru to Ni and resulted in intensified hydrogen adsorption, which was the crucial factor for the enhanced hydrogenolysis performance. The reaction condition of lignin hydrogenolysis was optimized, and 20.4 wt% monomer product yield was achieved at the temperature of 280 °C. This catalytic system is easy to realize and promising to be employed in the field of lignin utilization.
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EcoMat
·
2022
·Vol. 4
·期 2
·e12164
·
IF 12.213
Chaoyu Lin,Gan Luo,Huiqin Zhou,Anlin Feng,Li Zeng,Qingyang Li
An amorphous Ni nanoparticles-loaded ZnO nanowire array is controllably constructed on stainless steel mesh through combined electrodeposition and hydrothermal reaction. Its nano-arrayed structure not only provides a platform to achieve stable and good dispersion of Ni nanoparticles, but also helps improve their ability to adsorb 4-nitrophenolate ions and to capture hydrogen radicals, thereby accelerating the hydrogen transfer from metal hydride complex to 4-nitrophenol. Benefiting from the abovementioned unique features, it outperforms most Ni-based catalysts. While a 30-s re-electrodeposition of Ni can provide it extra 150 min of high catalytic activity towards the reduction of waste 4-nitrophenol to valuable 4-aminophenol, further demonstrating its outstanding reusability. The highly general methodology reported here paves the way to economically and effectively synthesize various other metal nanoparticles-loaded ZnO nanowire arrays on different conductive substrates, which not only enrich the nanowire-arrayed catalysts, but also significantly promote their practical utilizations in a wide range of environment-related fields.
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