MATERIALS CHEMISTRY AND PHYSICS
·
2019
·
IF 2.781
Zhiqiang Xu,Xianhua He,Mingwei Liang,Lijuan Sun,Di Li,Kenan Xie,Li Liao
Catalytic reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) over high-performance non-noble metal catalysts is attracting intensive attention. Herein, we report a graphene supported Cu@Ni bimetallic nanowires catalyst by a facile liquid phase reduction method with the assistance of an external magnetic field. The morphology and structure of the composite are studied by SEM, TEM and XPS. The vibrating sample magnetometer (VSM) is used to analyze its magnetic properties . Owing to the synergistic effect of graphene and bimetallic nanowires, the catalyst shows superior catalytic performance and excellent stability. The results of catalysis exhibit an extraordinary rate constant (1.16 min −1 ) and activity factor (5.81 min −1 mg −1 ) at room temperature, which are much higher than a majority of non-noble metal catalysts, even noble metal catalysts. Also, compared with noble metal catalyst, the novel catalyst possesses ferromagnetism , which facilitates the separation of catalyst and reaction system, and guarantees recyclability. Moreover, a possible synergistic catalytic mechanism based on the fact that electron transfer between copper-nickel nanowires and graphene has been proposed. It is believed that the novel catalyst has a great importance for the application of nanowires in the field of catalysis.
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DOI
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ACS Applied Nano Materials
·
2022
·
IF 6.14
Binglin Guo,Yihao Gao,Yongyue Li,Xin Sun,Shuailin Chen,Meicheng Li
Ni(OH)2 has low production cost and high theoretical specific capacity, while on account of the poor electronic conductivity, it shows inferior electrochemical performance including cycling stability and rate capability. This work focuses on a composite material that is in situ grown Ni(OH)2 nanosheets on reduced graphene oxide (rGO), and employing the fewer-defect rGO to build a three-dimensional conductive network provides outstanding conductivity. The specific capacitances (Cm) of the Ni(OH)2/rGO (NHG) electrode are 2776 F·g–1 at 2 A·g–1 and even 1570 F·g–1 at 50 A·g–1, demonstrating remarkable rate capability. It indicates that the combination of the nano grown Ni(OH)2 and rGO conductive substrate shortens the ion diffusion path and increases the electron transfer rate; hence, the composite rate capability has been significantly improved. The composite materials and active carbon were combined to be an asymmetric supercapacitor, which had a high energy density of 39.24 Wh·kg–1 at 1962 W·kg–1. After 10,000 cycles at 5 A·g–1, the capacity retains 91.4%.
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JOURNAL OF MATERIALS SCIENCE
·
2026
·
IF 4.4
Song Chao,Luo Hanqiong,Xu Jiayue,Gan Yuhao,Wang Yin,A. Runa,Hu Quanli
LaFeO 3 has emerged as a highly promising candidate for gas sensors, photocatalysts, catalysts, and microwave absorber applications. LaNiO 3 is a highly prospective system for CO oxidation, photodegradation of tetracycline, ammonia decomposition, magnetic refrigeration, and oxygen evolution reaction. Doping LaFeO 3 with Ni is an efficient approach to tailor its crystal structure, electronic structure, as well as magnetic and electrical properties. A simple electrospinning and annealing way were used to fabricate LaFe 1−x Ni x O 3 nanofibers, such as LaFe 0.9 Ni 0.1 O 3 , LaFe 0.7 Ni 0.3 O 3 , LaFe 0.5 Ni 0.5 O 3 , LaFe 0.3 Ni 0.7 O 3 , and LaFe 0.1 Ni 0.9 O 3 . The structural transition from orthorhombic phase to rhombohedral phase were suggested by Rietveld refined XRD patterns. A Quantum Design SQUID vibrating sample magnetometer was employed to characterize the magnetic characteristics of these fabricated nanofibers. Magnetic properties of LaFe 0.9 Ni 0.1 O 3 and LaFe 0.7 Ni 0.3 O 3 were dominated by Fe 3+ –O–Fe 3+ antiferromagnetism. LaFe 0.5 Ni 0.5 O 3 exhibited intense competition between Fe 3+ –O–Fe 3+ , Ni 3+ –O–Fe 3+ , and Ni 3+ –O–Ni 3+ interactions. The magnetic behaviors of LaFe 0.3 Ni 0.7 O 3 and LaFe 0.1 Ni 0.9 O 3 were dominated by Ni 3+ –O–Ni 3+ exchange, showing paramagnetic state. The findings of this research can provide insights into the structure–property relationships in LaFe 1−x Ni x O 3 nanofibers and offer a materials design perspective for manipulating magnetic interactions.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2015
·
IF 2.587
C. Shen,Y. Li,Y. J. Wang,J. H. Xu,G. S. Luo
We have put forward a facile and efficient strategy to immobilize Ni nanoparticles on porous glass by integrating two processes of ion-exchange and reduction in one step. The in situ method avoids the use of high temperature and stabilizers which may reduce catalytic activity. The adsorption process could be described by a Langmuir model with the adsorption capacity of 46.4 ± 0.9 mg/g. Monodispersed Ni nanoparticles with a mean diameter of 1.8 nm showed high catalytic activity for cyclohexene hydrogenation. When the Ni content was 1.144 wt %, 100% conversion was obtained with the space time of only 17.7 s. Notably, the strategy may also be applied to other base metal nanoparticles. Cu and Co nanoparticles with the mean diameter of 5.7 and 3.4 nm were successfully immobilized, respectively. This method may be readily changed to prepare other supported transition-metal nanoparticles with catalytic properties and opens new avenues to coordination catalysis.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Weiwei Zhang,Shengsong Du,Baosong Li,Tianyong Mei,Yicheng Miao,Hongqiang Chu,Jiajia Wang
In the present work, TiN nanoparticle reinforced Ni-Co alloy coatings have been synthesized by pulse current electrodeposition under the assistance of magnetic and ultrasonic agitation. Various analytical techniques including X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), atomic force microscope (AFM), X-ray photoelectron spectroscopy (XPS) were used to explore the effects of current densities and agitation modes on the coating composition, morphology and structure of the electrodeposits. The corrosion resistance of the composite coating was examined by electrochemical impedance spectroscopy (EIS) in 3.5 wt% NaCl solution. The electrodeposits prepared under magnetic stirring exhibit nodular-protrusion morphology. The ultrasonic-assisted electrodeposited Ni-Co/TiN coatings are flatter, finer, and denser compared to that of magnetic stirring. The agitation mode affects the Co and TiN content in the composite coatings. The preferred orientation was (111) texture, which was gradually changed to (200) plane as the current density increased. The crystallite size was 14–17 nm, 11–14 nm for the magnetic and ultrasonic-assisted electrodeposited Ni-Co/TiN coatings, respectively. The roughness of the samples prepared under ultrasonic agitation was lower than that of magnetic stirring. EIS measurements show that the composite coating prepared at 6 A dm −2 under ultrasonic assistance exhibits the best corrosion resistance with maximum R ct during the whole immersion period. The ultrasonic-assisted electrodeposited Ni-Co/TiN coating has a denser structure and better corrosion resistance than that prepared under mechanical stirring.
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ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Yanfei Xin,Xin Dai,Guangjun Lv,Xuedong Wei,Sai Li,Zhiqiang Li,Tong Xue,Ming Shi,Kunyang Zou,Yuanzhen Chen,Yongning Liu
α-Ni(OH)2 is an ideal candidate material for a supercapacitor except for its low conductivity and poor stability. In this work, BO2–-intercalated α-NixCo(1–x)(OH)2 is synthesized by a hydrothermal method at a low cost. The Co dopant can decrease the charge-transfer resistance and enhance the cyclic stability. The special unsaturated electronic state of BO2– enhances the bonding with metal ions and attracts water molecules. Thus, the BO2– ions support the hydroxide layers as pillars and create efficient paths for proton transportation, optimizing the utilization of α-Ni(OH)2. The three-dimensional (3D) flowerlike morphology supplies an enormous number of active sites, and r-GO is added to improve the conductivity. As a result, the modified α-Ni(OH)2 exhibits the specific capacitance of 2179, 1592, and 1423 F·g–1 at 1, 20, and 40 A·g–1, respectively, showing improved rate performance. Matching with the commercial activated carbon (AC) as an anode, the asymmetric capacitor delivers an energy density of 40.66 W·h·kg–1 when its power density is 187.06 W·kg–1. Meanwhile, it retains 81.5% capacitance of the initial cycle at 5 A·g–1 after 3000 cycles. With conductivity enhanced and structure stabilized, the modified α-Ni(OH)2 confronts broader fields of application.
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DOI
PubMed
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 99
·81474-81481
·
IF 3.84
Chao Gong,Miaoliang Huang,Jinfang Zhang,Min Lai,Leqing Fan,Jianming Lin,Jihuai Wu
Ni0.85Se was in situ grown on Ni foam via a facile hydrothermal process as a high-performance electrode for supercapacitors. The as-obtained Ni0.85Se electrode exhibited excellent electrochemical properties with a higher specific capacitance of 1115 F g−1 (1.34 F cm−2) and remarkable cycling stability (91.7% of the initial capacitance value remained after 1000 cycles). An asymmetric supercapacitor was fabricated successfully based on Ni0.85Se (positive electrode) and activated carbon (negative electrode). The Ni0.85Se//AC ASC can expand the operating voltage as high as 1.6 V, which led to an ultrahigh energy density of 32.2 Wh kg−1 at a power density of 789.6 W kg−1. Further, the ASC had a highlight cycle performance (only 1.7% of CT loss after 2000 cycles), so it holds promise as a potential candidate for energy storage devices.
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高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2014
·Vol. 161
·期 10
·B201
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IF 2.859
Yang Fan,Zijuan Yang,Xinhua Cao,Peifang Liu,Sen Chen,Zhen Cao
Hierarchical macro-mesoporous Ni(OH)2 were prepared by hydrothermal treatment of Ni(NO3)2 with dicyandiamide. This Ni(OH)2 nanostructure can be transformed to mesoporous NiO via calcination at 300°C. The structure, morphology and textural properties of the as-synthesized Ni(OH)2 and NiO were characterized. The electrochemical property and electrochemical sensing performance toward glucose detection were investigated. Owing to the unique macro-mesoporous structure, the Ni(OH)2 nanostructure could provide amperometric sensing of glucose with wide linear range (0.01–8.3 mM), high sensitivity of 243 μA mM cm−2 and low detection limit of 1 μM. Moreover, this glucose sensor also exhibited excellent stability, good selectivity and reproducibility.
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高影响因子
ELECTROCHIMICA ACTA
·
2014
·
IF 4.086
Jingwei Huang,Yuqing He,Jun Jin,Yanrong Li,Zhengping Dong,Rong Li
A novel Ni nanoparticle-MoS 2 nanosheet hybrid was prepared by chemically reducing Ni nanoparticles on MoS 2 nanosheet for the non-enzymatic detection of glucose. The morphology and structure of the Ni-MoS 2 hybrid were investigated by transmission electron microscopy (TEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The results indicated that Ni nanoparticles with an average diameter of 6 nm were successfully deposited on MoS 2 nanosheet. Electrocatalytic activity of the as-prepared nanomaterials towards glucose oxidation was investigated by cyclic voltammetry and amperometric measurement in alkaline media. An excellent sensitivity value of 1824 μA mM −1 cm −2 with a wide linear range (up to 4 mM) and low detection limit of 0.31 μM were gained by Ni-MoS 2 hybrid fabricated sensor. The superior catalytic activity and low expense make Ni-MoS 2 hybrid very promising for applications in direct sensing of glucose.
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International Journal of Electrochemical Science
·
2023
·
IF 1.5
Muhammad Sumair Sultan,Waqar Uddin,Salma Hamza,Abdullah K. Alanazi
Replacement of expensive state-of-art catalysts by cost-effective transition metal/composites is not only ease production of oxygen from water by electrochemical technique but also a step for the betterment of the green environment. In this regard, a composite of nickel and cobalt doped molybdenum disulfide (CoNiMoS 2 ) electrochemical catalyst was synthesized by a hydrothermal method which was found efficient for oxygen evolution reaction (OER) in an alkaline medium with an overpotential of 1.477 mV at a current density of 1.0 mA.cm −2 . Morphology of catalysts were analyzed through SEM & TEM. The brief explanation is that the pristine MoS 2 and NiMoS 2 were appeared flower-like petal nano-sheets whereas CoMoS 2 & CoNiMoS 2 seemed as a cubic structures. XRD & X-ray patterns has confirms crystallinity and composition of elements in composites. With the help of linear swept voltammetry (LSV) and electrochemical impedance spectroscopy (EIS), the polarization curves and charge transference resistance of catalysts were examined respectively.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yi-Ran Du,Rui Wang,Qing-Shan Niu,Yi-Yu Tao,Bao-Hua Xu
In this study, the bimetallic RuM-CeO 2 (M = Ni, Fe, Cu, K and Cs) catalysts were facilely fabricated by taking the commercially available CeO 2 (99.95 % metals basis, Aladdin, < 50 nm of diameter) as the support. They displayed distinct catalytic performance, especially the chemo-selectivity, on the methoxycarbonylation of styrene with CO and CH 3 OH. Impressively, Ru 2 Ni 0.6 -CeO 2 provided an up to 90.1 % yield of methyl phenylpropionate with satisfied linear selectivity (L/B = 91/9). The characterization and mechanistic results demonstrated that the doping of proper amount of Ni species enriches the local oxygen vacancy (Vö) at the surface but slightly reduces the charge at Ru sites, thereby modulating the interfacial Lewis acid − base pair (Ru-O-Ce-Vö) for catalysis. It thus enhances the CH 3 OH dissociation, leading to high coverage of OCH 3 species with low adsorption energy and relatively weak acidity. Further, the insertion of CO becomes readily due to the weak Ru-CO affinity at electron-deficient Ru center therein. As such, the apparent activation energies ( E a ) of styrene methoxycarbonylation over Ru 2 -CeO 2 (71.2 kJ mol −1 ) is nearly half-reduced by doping Ni element (Ru 2 Ni 0.6 -CeO 2 : 37.5 kJ mol −1 ). Meanwhile, the competitive side reactions at the surface of Ru 2 Ni 0.6 -CeO 2 is inhibited without sufficient acid strength and acid sites. Both aromatic olefins and cyclic olefins were well tolerated under such a system.
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产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Pei Liu,Haoran Wei,Tao Huang,Zhencheng Huang,Lingli Chen,Xuanlong He,Yuying Liu,Hongkai Yang,Mijie Liu,Shenghua Ye,Xuming Yang,Zhanhua Wu,Yaming Liu,Qingqing Jia,XiaoBai Ma,Jing Chen,Xiangzhong Ren,Xiaoping Ouyang,Jianhong Liu,Qianling Zhang,Jiangtao Hu
Ni-rich single-crystalline layered cathodes have garnered significant attention due to their high energy density and thermal stability. However, they experience severe capacity degradation caused by lattice strain and interfacial side reactions during practical applications. In this study, an effective yttrium modification method is employed to stabilize the structure of Ni-rich single-crystalline LiNi0.83Mn0.05Co0.12O2 (SC-NMC83) to solve these issues. This innovative approach successfully immobilizes oxygen within the material, preventing crack formation while simultaneously broadening the diffusion path of Li+. The yttrium-modified sample (SC-NMC83-Y) exhibits a superior capacity retention compared to the SC-NMC83 sample, with values of 90% and 76.1% after 100 cycles, respectively. This work demonstrates the promising potential of a doping strategy for Ni-rich single-crystalline cathodes and paves a pathway for its practical implementation, such as all-solid-state batteries.
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DOI
PubMed
高影响因子
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