Sustainable Energy & Fuels
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2020
·Vol. 4
·期 6
·2768-2774
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IF 5.503
Qinghai Yang,Congquan Zhou,Jihong Ni,Xiaofei Guan
We present a liquid catalytic system comprising a liquid Ni–Bi alloy and a molten K2CO3 salt, which completely resolves the coking and sintering issues for dry reforming. The conversions of CH4 and CO2 reach 60% and 70%, respectively, in a 30 cm bubble column comprising 15 cm Ni0.27Bi0.73 and 15 cm K2CO3 at 1050 °C. The CO selectivity is near 100% throughout the temperature range of 950–1050 °C. A 120 hour stability test at 1000 °C shows no performance degradation, suggesting a stable and effective dry reforming process for syngas production. The catalytic performance and durability demonstrated highlight the potential of dry reforming for commercial applications.
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CHEMICAL ENGINEERING JOURNAL
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2020
·
IF 10.652
Shanshan Qiao,Chao Feng,Yuan Guo,Tingxiang Chen,Naeem Akram,Yi Zhang,Wei Wang,Fan Yue,Jide Wang
The exploration of bifunctional catalysts to produce both hydrogen and oxygen will accelerate the progress of overall water-splitting. This paper introduces a facile method to fabricate bifunctional photocatalysts toward the water splitting by doping nano CdS with S vacancies on Ni@NiO nano-spheres. A serious of photocatalytic catalysts were developed and subsequently characterized, the two half-reactions of photocatalytic water splitting were studied in detail by using sacrificial agents, the hydrogen output at 41699 μmol g −1 h −1 (AQE 28.5%, λ = 420 nm) while the evolution of O 2 is as high as 55120 μmol g −1 h −1 (AQE 35.7%, λ = 450 nm). It is a strategy that the presence of Ni@NiO can trigger the S vacancy in CdS to act as an effective electron trap, the p-n junction of NiO-CdS, as well as the Schottky barrier between NiO and Ni, can change the dynamic characteristics of photogenerated electrons and prolong their life. These prolonged photogenerated electrons can initiate stable and effective photocatalytic redox reactions.
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ACS Applied Materials & Interfaces
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2020
·
IF 8.758
Hao Chang,Pan Zhang,Rui Guo,Yuntao Cui,Yi Hou,Ziqiao Sun,Wei Rao
Gallium-based liquid metals are applied in the fabrication of soft electronics because of their conductivity and flexibility. However, the large surface tension and weak adhesion of liquid metals limit the available printing substrates. Recent researches indicate that amalgamating metal particles can turn liquid metal from fluid into a paste which has superb electrical conductivity, plasticity, and strong adhesion to substrates. In this work, a recoverable liquid metal paste was made by mixing eutectic Ga–In alloy and nonmetallic SiO2 (quartz) particles (Ga–In–SiO2 paste, called GIS). GIS has excellent conductivity and printable properties similar to those of previously reported liquid metal pastes. Furthermore, the bonding between Ga–In alloy and quartz particles is reversible. In acidic or alkaline solution, Ga–In alloy can be separated from quartz particles and agglomerated to bulk by stirring. Moreover, the study of the mechanism of adhesion behavior suggests that extruding fresh liquid metal droplets to form more oxide and shearing friction are the critical factors for adhesion. This work proposed a new liquid metal paste with a reversible rheological property and promoted the understanding of the working principle of liquid metal paste.
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PubMed
高影响因子
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
·
2020
·Vol. 95
·期 6
·1748-1755
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IF 2.75
Ting Wang,Junnan Wei,Yunchao Feng,Huai Liu,Xing Tang,Xianhai Zeng,Yong Sun,Tingzhou Lei,Lu Lin
BACKGROUND Biomass holds the promise to provide a sustainable future for the chemical industry. 2, 5-Bishydroxymethylfuran (BHMF) is a versatile bio-based diol with a broad range of potential applications in many polymeric materials, artificial fibers and drugs. However, the controlling of the BHMF selectivity in hydrogenation of biomass-derived 5-hydroxymethylfurfural (HMF) with complex transformation pathways is always a great challenge especially under solvent-free conditions in which many side reactions may occur due to its rich reducible groups. RESULTS A facile and effective approach was developed for the selective synthesis of BHMF by solvent-free hydrogenation of a deep eutectic mixture consisting of HMF (75 wt%) and choline chloride (ChCl), by which a BHMF selectivity up to 94.6% was gained at full HMF conversion over Raney Co at 100 °C in 4 h. In addition, the HMF conversion and selectivity toward BHMF can be regulated and controlled through altering the strength of hydrogen-bonding interactions of HMF-based deep eutectic mixtures (ChCl–HMF mixtures). CONCLUSION We developed an effective approach that allows the solvent-free synthesis of BHMF via hydrogenation of HMF-based deep eutectic mixtures. The extraordinary BHMF selectivity in the solvent-free hydrogenation of HMF is reasonably attributed to the hydrogen-bonding interactions formed between ChCl and HMF/BHMF which greatly suppresses the side reactions of HMF and the over-reduction of BHMF. © 2020 Society of Chemical Industry
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Sustainable Energy & Fuels
·
2020
·Vol. 4
·期 4
·1883-1890
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IF 5.503
Chengbo Wei,Xiaoming Fan,Xue Deng,Linzheng Ma,Xiao Zhang,Qingyun Liu,Jinxue Guo
Efficiently generating hydrogen in neutral solution is essentially important for electrocatalysts toward practical application of water splitting; however, most of the catalysts show promising activity only in acidic or alkaline media. Herein, a surface modulation method is developed via doping Ru onto the surface of a Ni2P nanosheet array supported on nickel foam (Ru-Ni2P/NF) to activate the robust hydrogen evolution activity. The Ru species achieve optimized surface chemistry for catalysis, including boosted intrinsic activity, improved catalytic center density, and enhanced kinetics. The as-obtained electrode exhibits Pt-like catalytic activity, as well as good stability in both neutral and alkaline solution. Exploring efficient and wide-pH electrocatalysts by such surface chemistry modulation would be of great value for the development of advanced materials for energy conversion.
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JOURNAL OF THERMAL SPRAY TECHNOLOGY
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2020
·Vol. 29
·期 7
·1827-1837
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IF 2.522
Zhang Ying,Han Tengfei,Xiao Meng,Shen Yifu
The diamond enhanced (NiCoCrTi 0.5 Nb 0.5 )C x ( x = 3, 6, 12 wt.%) high-entropy alloy coatings were well-prepared by laser cladding, which are denoted as C 3 , C 6 and C 12 , respectively. The macroscopic morphology, phase, microstructure, hardness and wear resistance were investigated. The coatings without pores and cracks, are well-metallurgically bonded with the substrate. The width, melting depth and dilution rate of (NiCoCrTi 0.5 Nb 0.5 )C x coating decrease with the increase of diamond content. The coatings are mainly composed of BCC solid solution, (Ti,Nb)C and Cr 3 C 2 . The increase of diamond content results in the precipitation of (Ti,Nb)C and Cr 3 C 2 , and the coating with x = 12 wt.% retains more diamonds. The hardness of coatings is much higher than that of the substrate. As the diamond content increases, the average hardness of (NiCoCrTi 0.5 Nb 0.5 )C x coating increases first and then decreases. The abrasive wear occurs in each coating. The wear depth, roughness and wear rate decrease first and then increase as the diamond content increases. The C 6 coating with the better wear resistance produces a smooth worn surface, which indicates that C 6 coating can be fully applied to various tools, molds and mechanical parts.
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高影响因子
ACS Sustainable Chemistry & Engineering
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2020
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IF 7.632
Pengfei Shang,Zhiguo Ye,Yi Ding,Zhixiang Zhu,Xinyuan Peng,Guang Ma,Duosheng Li
Owing to unstable electrical energy generation from intermittent solar and wind energy sources, the development of efficient and durable nonnoble electrocatalysts is extremely desirable, in particular, those that can be used over a wide range of current densities for the hydrogen evolution reaction (HER), especially >1 A cm–2, which is extremely desirable for energy transformation in power systems. Here, a nanosponge-like NiMo solid solution based on a nanoscale Kirkendall effect is fabricated via a one-step high-temperature sintering method. A polycrystalline layer of NiMo oxyhydroxide is formed on the surface of the as-prepared electrode after aging, thus achieving a low overpotential and Tafel slope of 37 mV at 10 mA cm–2 and 39.2 mV dec–1, respectively. The electrode displays superior electrochemical stability over a wide range of current densities without compromising its electrocatalytic activity; in particular, it is durable for over 300 h at 2 A cm–2. This is attributed to the combination of the 3D-interconnected nanosponge structure, synergistic effect between the Ni and Mo species, lattice distortion of the solid solution, and its high conductivity. This work provides a possible commercialization for the fabrication of nonprecious electrocatalysts with high performance in large-scale energy conversion.
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高影响因子
Journal of Materials Chemistry A
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2020
·Vol. 8
·期 11
·5699-5708
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IF 11.301
Xin Qian,Dongyang Wang,Yang Zhang,Haijun Wu,Stephen J. Pennycook,Lei Zheng,Pierre F. P. Poudeu,Li-Dong Zhao
The metallic elements with a small atomic radius can not only compensate for the intrinsic vacancies to improve the carrier mobility, but also can form interstitials to reduce lattice thermal conductivity. In this work, we investigate the contrasting roles of three different metallic elements with small atomic radius on the thermoelectric properties of n-type PbM0.01Se (M = Cu, Zn, Ni). We find that all the metallic elements can increase the carrier concentration as electron donors and improve the electrical transport properties. In addition, the lattice thermal conductivity of PbSe can be significantly decreased through the formation of interstitials by the incorporated extra metallic elements. We also find that the PbCu0.01Se sample exhibits a unique and complex behavior compared with the other samples due to the diffusion and the thermally activated oxidation of Cu+ ions. When the temperature increased to 673 K, the carrier concentration of PbCu0.01Se sample increases suddenly and continues to increase by nearly two folds, which we ascribe to the release of 3d orbital electrons in Cu+ ions. This results in a strong decoupling of the charge and heat transport in the material, which can be manifested by the overestimation of the electronic thermal conductivity when assuming strong electron–phonon coupling in Wiedemann–Franz law. A maximum ZT of ∼1.6 can be reached at 773 K and the average ZT of ∼0.96 can be achieved in PbCu0.01Se. Our results demonstrate the exceptional contrasting behavior of Cu in PbSe by comparing with Zn and Ni, and the thermoelectric performance of n-type PbSe can be enhanced through the introduction of extra metallic elements with small radius.
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SURFACE & COATINGS TECHNOLOGY
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2020
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IF 3.784
Lianbo Wang,Shilong Xing,Huabing Liu,Chuanhai Jiang,Vincent Ji
In the present work, CeO 2 nanoparticles were extra added into Ni Ti nanocomposite coating to optimize the spatial microstructures and wear properties. Before adding CeO 2 nanoparticles into Ni Ti nanocomposite coating, Ti microparticles distributed in forms of cluster in Ni deposits, leading to the spatial inhomogeneity of microstructures like local large grains and residual [200] fiber textures. Correspondingly, the hardness in small-grain regions was up to ~4456 ± 46 MPa, while the hardness in large-grain areas dropped to values as low as ~3493 ± 40 MPa. Besides that, inside pores and jagged surface were observable, confining the wear resistance capacity. The average hardness was ~3814 ± 279 MPa. After extra adding CeO 2 nanoparticles into Ni Ti nanocomposite coating, Ti microparticles homogeneously scattered throughout the whole nanocomposite coating, leading to the spatial homogeneity of microstructures and properties. Grain size steadily kept at ~40 nm and the hardness stabilized at ~4326 ± 150 MPa. Inside pores vanished, the surface became smooth, and residual [2 0 0] texture was fractured. Benefiting from the modified spatial microstructures and improved hardness, enhanced wear resistance was achieved.
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Journal of Energy Chemistry
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2020
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IF 7.216
Jia Sun,Lei Du,Baoyu Sun,Guokang Han,Yulin Ma,Jiajun Wang,Hua Huo,Pengjian Zuo,Chunyu Du,Geping Yin
ABO 3 -type perovskite oxides (e.g., LaCoO 3 ) with flexible and adjustable A- and B-sites are ideal model catalysts to unravel the relationship between the electronic structure and electrocatalytic activity (e.g., oxygen reduction/evolution reactions, ORR/OER). It has been well understood in our recent work that the secondary metal dopant at B-site (e.g., Mn in LaMn x Co 1 −x O 3 ) can regulate the electronic structure and improve the ORR/OER activity. In this work, the Mn-Ni pairs are employed as the dual dopant in LaMn x Ni y Co z O 3 ( x + y + z = 1) catalysts toward bifunctional ORR and OER. The structure–property relationships between the triple metal B-site (Mn, Ni and Co) and the electrochemical performance are particularly investigated. Compared to the individual Mn doping (e.g., LaMnCoO 3 (Mn:Co = 1:3) catalyst), the dual Mn-Ni doping significantly improves the ORR mass activity@0.8 V by 1.54 times; meanwhile, the OER overpotential@10 mA cm −2 is reduced from 420 to 370 mV, and the OER current density at 1.55 V is increased by 2.43 times. Reasonably, the potential gap between E ORR @-1 mA cm −2 and E OER @10 mA cm −2 is achieved as only 0.76 V by using the optimal LaMn x Ni y Co z O 3 ( x : y : z = 1:2:3) catalyst. It is revealed that the dual Mn-Ni dopant efficiently optimizes electron structures of the LaMnNiCoO 3 (1:2:3) catalyst, which not only decreases the e g orbital electron number, but also modulates the O 2p-band closer to the Femi level, accounting for the enhanced bifunctional activity.
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高影响因子
CERAMICS INTERNATIONAL
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2021
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IF 4.527
Bo Kang,Xiaochi Lu,Yu Chen,Peitao Xie,Qi Jia,Liyan Zhu,Jun Liu,Bin Quan
Proper physical property and well-designed microscopic structures are significant in determining the electromagnetic energy conversion. In this work, nickel foam (Ni F )-based rod-like absorbers with double dielectric regulation were achieved via continuous hydrothermal reaction and subsequent heating treatment. The Ni F -based uniform integration of binary metal oxides not only maintain the inherent excellent dielectric property of Ni F , but also introduce extra dipolar polarizations (caused by multiple covered dielectrics) and Maxwell-Wagner-Sillars effect (induced by large dielectric property differences at the interfaces), which all contribute to the excellent microwave absorption performance. In addition, derived from the high/low dielectric synergetic effect, a balance between the introduction and dissipation of the electromagnetic energy can be realized. Based on that, the maximum bandwidth of Ni F -based binary absorber reaches 7.28 GHz at 2.4 mm. This work not only provides a facile and versatile strategy to fabricate Ni F -based ternary microwave absorbers, but also demonstrates the significant role of dielectric synergetic effect in optimizing microwave absorption performance.
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高影响因子
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
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2021
·Vol. 96
·期 11
·3043-3051
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IF 3.174
Neng Xiong,Jin-Rong Huang,Sheng Wei,Ji-Wei Song,Zhong-Ce Hu,Ya-Ping Xue,Yu-Guo Zheng
BACKGROUND Miglitol is a potent alpha-glucosidase inhibitor that is used as a hypoglycemic agent. The industrial synthesis route of miglitol involves the biotransformation from N -2-hydroxyethyl glucamine to 6-( N -hydroxyethyl)-amino-6-deoxy-alpha- l -sorbofuranose and the subsequent hydrogenation from 6-( N -hydroxyethyl)-amino-6-deoxy-alpha -l- sorbofuranose to miglitol. This study comprehensively investigated the hydrogenation process and catalyst, and the effect of operating parameters on the product yield. RESULTS A 55.6% miglitol yield was obtained under the following optimal reaction conditions: 5 g L −1 palladium/carbon (Pd/C) (5% Pd); ethanol addition 1:1 ethanol:water (v/v); 80 g L −1 6-( N -hydroxyethyl)-amino-6-deoxy-alpha -l- sorbofuranose; reaction temperature 25 °C; solution pH 6; stirring speed 500 rpm; hydrogen pressure 1 MPa. The yield obtained was much higher than the average 36.8% in current industrial production. Catalyst deactivation during reuse was found to be caused by biological impurities, especially the macromolecular impurities introduced in previous biotransformation. The deposition of impurities on the porous support of the Pd/C catalyst may be the direct cause of catalyst deactivation. CONCLUSION Optimal conditions for the hydrogenation in the synthesis of miglitol were determined. It also was confirmed that biological impurities need to be completely removed to avoid catalyst deactivation and to improve catalyst reusability.
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