JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2022
·
IF 6.364
Yunsong Liu,Yuying Gao,Enhui Wang,Guangyao Chen,Enxia Xu,Fei Zhao,Yunsong Zhao,Chonghe Li,Xinmei Hou
The interfacial behavior between CaAl 12 O 19 -MgAl 2 O 4 spinel (CA 6 -MA) crucible and molten wrought Ni-based superalloys during the vacuum induction melting process have been comprehensively investigated, with Al 2 O 3 crucible included for comparison. Experimental and theoretical results suggest that CA 6 -MA crucible exhibits higher thermodynamic stability and poor wettability to the superalloy melt. Benefited from these merits, the superalloy ingot with cleaner surfaces and more metallic luster is obtained in the CA 6 -MA crucible. Furthermore, the total oxygen content in the superalloy ingots obtained from CA 6 -MA crucible is 17.9 ppm, which is considerably lower than that from Al 2 O 3 crucible (29.7 ppm). These results indicate that CA 6 -MA crucible can be a promising candidate for melting wrought Ni-based superalloys.
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2022
·
IF 8.035
Ji Zhao,Xian-Yong Wei,Jing-Hui Lv,Qian-Qian Kong,Jia-Hao Li,Zhuang Li,Zi-Chun Fan,Li Li,Yang-Yang Zhang,Zhi-Min Zong
Ni/CeO 2 with medium-strong acidity was prepared by in - situ carbon templating (ISCT) and reduction with H 2 . Oxydibenzene (ODB) and benzyloxybenzene (BOB) were used as lignin-related model compounds (LRMCs). Over Ni/CeO 2 , ODB was completely converted into cyclohexane ( CH I ) under initial hydrogen pressure (IHP) of 2 MPa at 160 °C for 2 h and complete conversion of BOB to CH I and methylcyclohexane (MCH) was achieved under IHP of 2 MPa at 120 °C for 1.5 h. H … H transfer to the benzene rings (BRs) in the LRMCs and phenol from BOB hydrocracking results in the BR hydrogenation, while H + transfer to the oxygen atom in BOB, hydrogenated ODB, and BOB-derived cyclohexanol ( CH II ) leads to the >CH-O- bond cleavage and subsequent dehydration of the resulting protonated CH II (PCH II ) . In addition, Ni/CeO 2 exhibits an excellent reusability.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Yanran Su,Liang Li,Dao Wang,Yang Xu,Lingling Ma,Gengping Wan,Changlong Du,Jun Liu,Ying Zhang,Qiyi Wei,Guizhen Wang
The development of electronic information technology has placed higher demands on microwave absorption materials (MAMs), especially the exploration of novel MAMs to broaden their application. At present, little attention has been given the wave absorption properties of transition metal borides (TMBs). In this work, a simple and economical method is developed to prepare Ni 3 B/Ni heterostructure nanosheets and their possible applications for microwave absorption (MA) and supercapacitor are evaluated. It is worth noting that Ni 3 B/Ni nanosheets exhibit excellent MA properties due to the aggregated nanosheet-like morphology of Ni 3 B/Ni with enhancing interfacial polarization, as well as the synergistic effect of dielectric and magnetic losses. It is observed in experiments that the minimum reflection loss value of Ni 3 B/Ni is −41.60 dB at 16.8 GHz. Moreover, the maximum effective absorption bandwidth can reach 3.28 GHz. Furthermore, Ni 3 B/Ni has good energy storage characteristics and is able to provide a specific capacity of 1150.6 F g −1 at a current density of 1 A g −1 . Meanwhile, it has the ability to maintain an initial capacity of 74.4 % after 1000 cycles at a current density of 10 A g −1 . Therefore, this study provides an idea to explore TMBs as high-performance MA and supercapacitor materials.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Catalysis Science & Technology
·
2023
·Vol. 13
·期 5
·1488-1500
·
IF 5
Huiyue Xin,Mengnan Li,Li Chen,Chen Zhao,Peng Wu,Xiaohong Li
NiO–LnOx (Ln = La, Ce or Pr) precursors were prepared using a sol–gel method with glucose as a template, and the corresponding Ni/LnOx catalysts were obtained by reduction in hydrogen at 500 °C. When applied to the selective hydrogenation of cinnamaldehyde (CAL), the Ni/La2O3 catalyst exhibited superior behavior to Ni/Pr6O11 and Ni/CeO2, affording 90.2% selectivity to hydrocinnamaldehyde (HCAL) with an initial activity of 0.57 s−1 under mild conditions. Various characterization techniques confirmed that the formation of the perovskite LaNiO3 precursor enhanced the interaction of Ni species with lanthanum species, and effectively avoided the agglomeration of Ni nanoparticles during the reduction. Hence, Ni nanoparticles could achieve high and uniform dispersion. Moreover, the CO group in CAL was preferentially adsorbed and fixed by weak and medium-strong basic sites (La3+–O2−) on the Ni/La2O3 catalyst, so that the chemisorption of the CC bond on active Ni nanoparticles becomes more favorable and thus the corresponding selective hydrogenation of the CC bond dominates.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Liming Zeng,Tianxiang Yuan,Zerui Liu,Yongyang Zhu,Daifeng Wu,Dongxing Wang,Qing Zhou,Renheng Tang
Aiming at the sluggish water dissociation step in alkaline hydrogen evolution reaction (HER), the platinum-nickel alloy material (PtNi 10 /C) featuring unique crystalline/amorphous structure supported on carbon black is deliberately designed and fabricated via a reversely rapid co-precipitation and mild thermal reduction strategy. Electrochemical results show that only 66 mV of overpotential is needed for PtNi 10 /C to drive a current density of 10 mA cm −2 at a lower platinum loading (8.3 μg Pt cm-2 geo), which is much lower than that of other catalysts with a single metal source(S-Ni/C and S-Pt/C) and even the commercial Pt/C catalyst (20 wt%). The target catalyst also exhibits smaller tafel slope value (16.73 mV dec −1 ) and electrochemical impedance value, enabling a fast kinetics rate for water dissociation. Partial crystallization facilitates moderate adsorption of intermediates, while the high-valence Ni(II) and Pt(II) species serve as pivotal driving force for the kinetic dissociation of water. The unique microstructure of PtNi 10 /C shows a remarkable advantage toward HER in alkaline but acidic medium. In addition, other transition metal-based catalysts following the similar protocol are also fabricated and present varying degrees of HER performance. Hence, the facile and rapid co-precipitation/thermal reduction strategy proposed in this study provides some guidelines for designing high-efficiency alkaline HER catalysts.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FUEL
·
2022
·
IF 8.035
Ji Zhao,Jing-Hui Lv,Xian-Yong Wei,Qian-Qian Kong,Jia-Hao Li,Yang-Yang Zhang,Zhuang Li,Li Li,Zi-Chun Fan,Zhi-Min Zong
Ni/CeO 2 -La 2 O 3 with strong acidity was prepared by in - situ carbon templating (ISCT) and subsequent reduction with H 2 . The phase composition, specific surface area, morphology, acidity, and elemental valence composition of the catalyst were characterized. The catalytic methylation (CM I ) of phenol over the catalyst in different ratios of methanol to n -hexane was investigated under N 2 atmosphere. Over the catalyst, phenol was completely converted into 2,6-xylenol at 260 °C for 3 h via the CM I of phenol to o -cresol and subsequent CM I of o -cresol.
✓ 已验证
产品关联
DOI
高影响因子
CHEMOSPHERE
·
2022
·
IF 8.943
Ying Liu,Xiaoya Liu,Xinying Liu,Yajing Li,Jinghuan Ma,Cong Ma
As one of the key factors that affect the application of hydrazine hydrate as a potential hydrogen source, efficient and cheap catalyst is particularly important. Nickel based catalysts have been widely studied because of their excellent catalytic performance for the decomposition of hydrazine hydrate to hydrogen. Herein, a Ni catalyst supported on anatase TiO 2 through reduction and impregnation methods was prepared. Structure of the catalyst was investigated by transmission electron microscopy (TEM), X-ray diffraction (XRD), Brunauer–Emmett–Teller (BET), and X-ray photoelectron spectroscopy (XPS). The effects of the amount of TiO 2 and the concentration of NaOH on the activity of the catalyst were investigated. The results showed that the catalyst prepared with a metal nickel content of 0.2 mmol using 100 mg of the nano-TiO 2 support had the best catalytic performance. Hydrazine hydrate could be completely decomposed at 343 K in 2.83 min, the hydrogen selectivity attained 100%, and the turnover frequency (TOF) value was 265.49 h −1 . In this catalyst, transition metal Ni was dispersed on the support surface in the form of amorphous elemental or oxide. Anatase TiO 2 support had the advantages of promoting the dispersion of metal Ni, exposing the active site, changing the electronic state of the active center, strengthening the strong metal-support interaction (SMSI), and improving the activity of the catalyst. After ten cycles of use, the performance of the catalyst stabilized and the hydrogen selectivity was still as high as 100%.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Advanced Materials Technologies
·
2023
·Vol. 8
·期 8
·2201688
·
IF 6.8
He Zhang,Jiayun Feng,Fangyuan Sun,Dongyan Zhou,Ge Cao,Shang Wang,Xuanyi Hu,Jingxuan Ma,Fengyu Su,Yanqing Tian,Yanhong Tian
Electrochromic devices (ECDs) with adjustable transmittance have opened new opportunities to the development of smart windows for energy-efficiency building. However, the switching between colored and bleached state of conventional ECD will bring extra energy consumption, the design of high-performance ECD with low consumption is still an elusive goal. To address this issue, a self-driven and energy-saving Ni anode-based ECD using Prussian blue as electrochromic material is developed. During the day, it can be colored by solar energy. By contrast, it can spontaneously bleach when the ECD's anode and cathode are short-circuiting using the internal redox potential during the night. It is worth noting that no extra energy is inputted in the coloring-bleaching cycle. In comparison with the ECD using electrolyte with high Ni 2+ (K + :Ni 2+ = 1:9) or high K + (K + :Ni 2+ = 9:1) concentration with poor optical contrast and cyclic stability (failed <100 cycles), the Ni-based ECD with the electrolyte containing equal amount of K + and Ni 2+ exhibits a high optical contrast (39.45%), good coloration response time (6 s), and excellent stability (1000 cycles). These properties suggest that the Ni-based electrochromic configuration is expected to be a catalyst for the development of energy-storage EC smart window in the future.
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITE INTERFACES
·
2022
·
IF 2.839
Han He,Yehua Jiang,Juanjian Ru,Rong Zhou,Yixin Hua
The surface metallization of zirconia-toughened alumina (ZTA) particles with Ni–Cu bimetallic coatings is performed by electroless plating assisted with choline chloride–ethylene glycol (ChCl-EG) ionic liquid. The possible reactions and deposition sequences of the plating process have been analyzed based on the micro-morphologies of the Ni–Cu coated ZTA (ZTA@Ni–Cu) particles obtained at different reaction stages. The roles of ChCl-EG additive, reaction temperature, and ZTA concentration on the surface morphology, coating thickness, and element content of the ZTA@Ni–Cu particles are also investigated. Results show that uniform cauliflower-characteristic Ni–Cu coatings are formed on ZTA surfaces with 35 g·L−1 ChCl-EG at 65°C. The coating thickness is about 26.9 μm, and the element contents of Cu and Ni are 38.1 at% and 61.9 at%, respectively. Besides, a schematic illustration about the fabrication of ZTA@Ni–Cu particles is proposed to elaborate the formation process of Ni–Cu coatings and the function mechanism of ChCl-EG additive.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2022
·Vol. 103
·期 2
·505-514
·
IF 2.606
Zou Chang,Guo Xingzhong,Wang Fan,Tian Rui,Hou Yang,Liu Fu,Yang Hui
Three-dimensional macroporous heterostructural Ni-Fe hydroxides with different mole ratio (Ni x Fe (1−x) -PH) were prepared via a sol-gel process combined with phase separation, and the overall water splitting electrocatalytic activity of the resultant macroporous Ni-Fe hydroxides were investigated in detail. The as-prepared Ni-Fe hydroxide has cocontinuous skeletons and interconnected macropores with a narrow pore size distribution (~150 nm), and possesses outstanding electrocatalytic activity with an overpotential of 263 mV for oxygen evolution reaction (OER) and 175 mV for hydrogen evolution reaction (HER) at 10 mA·cm −2 in 1 M KOH, respectively. The Ni 0.6 Fe 0.4 -PH | | Ni 0.6 Fe 0.4 -PH has efficient overall water splitting performance with a cell voltage of 1.61 V at 10 mA·cm −2 and great stability. The fantastic macropore structure and strong synergistic effect between Ni-Fe hydroxides significantly reinforce the contact area between the electrocatalyst and electrolyte, and endow high electrocatalytic performance of bifunctional electrocatalysts.
The epoxide-induced sol-gel process accompanied by phase separation allows the synthesis of macroporous heterostructural Ni-Fe hydroxide bifunctional catalyst with a mass of active sites, displaying excellent electrocatalytic activity and low overpotential at several current densities for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER).
✓ 已验证
产品关联
DOI
高影响因子
CARBON
·
2022
·
IF 11.307
Dawei Liu,Lei Yang,Fengyuan Wang,Hao Zhang,Jia Liu,Tong Lv,Hongjie Zhao,Yunchen Du
The construction of special three-dimensional microstructure is becoming an extremely fascinating approach to upgrade the electromagnetic properties of carbon-based microwave absorption materials (MAMs) recently. Herein, we have demonstrated the successful fabrication of a series of carbon nanotubes (CNTs)@Ni/C foams (CNCFs) through two-step pyrolysis processes . It is found that the loading amount of CNTs has an obvious influence on modulating the electromagnetic diameters of CNCFs, and thus effectively tuning their microwave absorption properties . With the relative carbon content of 66.3 wt%, CNCFs-2 exhibits admirable microwave absorption performance , including the effective absorption bandwidth of 5.8 GHz with the absorber thickness of 1.8 mm and the maximum reflection loss intensity of −47.0 dB therein. Electromagnetic analysis reveals that the intrinsic attenuation ability, well-matched characteristic impedance , and multiple reflection effect synergistically work for the excellent reflection loss characteristics of CNCFs-2, which indicates rational microstructure design and appropriate chemical composition regulation are vitally important for the enhancement of microwave absorption performance. We believe these desirable microwave absorption properties can make CNCFs-2 eligible to be a very promising candidate for high-performance MAMs, and this research will provide some inspirations more or less for the development of more advanced carbon-based MAMs in the future.
✓ 已验证
产品关联
DOI
高影响因子
Coatings
·
2022
·Vol. 12
·期 8
·1223
·
IF 3.236
Yutao Yan,Lifeng Lu,Yuqiu Huo,Yong Zhao
Among the preparation methods of functional coatings, the electrodeposition technique has attracted much attention due to its advantages of economy, high efficiency and good structural adaptability. The application of aluminum alloy materials is greatly limited due to their poor friction reduction and wear resistance. Therefore, to enhance the tribological behaviors of aluminum alloy materials, the Ni-MoS2, Ni-SiC and Ni-MoS2/SiC composite coatings were prepared on the 2218 aluminum alloy by an electrodeposition technique. The prepared composite coating samples exhibited a compact and dense microstructure, which was consistent with the result of their high microhardness. No obvious microcracks and defects appeared at the interfaces, indicating that the composite coating samples had good adhesion to the substrates and can effectively improve the frictional shear resistance. The results of wear experiment showed that the wear rate, friction coefficient and friction response time of all composite coating samples were lower than that of the substrate sample. However, the friction reduction and wear resistance of the same composite coating sample were not consistent. The friction coefficient of the Ni-MoS2composite coating sample was the lowest, and the wear rate of the Ni-SiC composite coating sample was the lowest. According to the worn surface observations, the wear mechanism of composite coating samples was mainly characterized by the mild abrasive wear, flake spalling, tearing and pits caused by particle shedding, and the substrate sample showed a severe adhesive wear and abrasive wear.Keywords:electrodeposition;composite coating;microstructure;friction;wear mechanism
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）