NANOTECHNOLOGY
·
2021
·Vol. 32
·期 33
·335603
·
IF 3.874
Baige Yuan,Jun Li,Manman Xia,Ying Zhang,Ruyan Lei,Peng Zhao,Xiao Li
Hollow-structured NiO + Ni nanofibers wrapped by graphene were designed and successfully fabricated via a simple method. First, solid NiO + Ni nanofibers were prepared by electrospinning followed by calcination. Here, a portion of the metallic Ni was retained to improve the electrochemical performance of NiO by adjusting the calcination temperature. Next, the nanofibers were thoroughly mixed with different amounts of graphene and calcinated once more to form hollow-structured NiO + Ni nanofibers with an extremely high specific surface via the reaction between graphene and NiO on the nanofiber surface and subsequent migration of NiO into the nanofibers. Results showed that the obtained hollow-structured NiO + Ni electrode demonstrates optimal electrochemical performance when the graphene content is controlled to 3 wt%. The first cycle discharge/charge specific capacity of the electrode peaked (1596/1181 mAh · g−1 ) at 100 mA · g−1, with a coulombic efficiency of approximately 74% (60% for 0 wt% graphene, 65% for 1 wt% graphene, and 51% for 4 wt% graphene). It also presented excellent cycling stability after 100 cycles at 100 mA · g−1 on account of its high retained discharge specific capacity (251 mAh · g−1 for 0 wt% graphene, 385 mAh · g−1 for 1 wt% graphene, 741 mAh · g−1 for 3 wt% graphene, and 367 mAh · g−1 for 4 wt% graphene). Moreover, the synthesized electrode possessed outstanding rate capability owing to its large average discharge specific capacity of approximately 546 mAh · g−1 (45 mAh · g−1 for 0 wt% graphene, 256 mAh · g−1 for 1 wt% graphene, and 174 mAh · g−1 for 4 wt% graphene) from 100 mA · g−1 to 2000 mA · g−1. The observed improvement in electrochemical performance could be attributed to the increase in active sites and decrease in charge transport distance in the hollow-structured NiO + Ni nanofibers. Excessive introduction of graphene caused a sharp loss in electrochemical performance due to the agglomeration of graphene sheets on the nanofiber surfaces.
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高影响因子
ENERGY & FUELS
·
2020
·
IF 3.421
Fanghui Wang,Yimeng Luo,Yajun Zhang,Yanan Wang,Hong Zhu
A NiO–Ni foam composite carrier was prepared by the hydrothermal method. Ruthenium metal was supported on the NiO–Ni foam by electroplating, obtaining a highly active bush-like Ru/NiO–Ni foam catalyst. To investigate the effect of NiO on the structure and performance of the catalyst, a Ru/Ni foam catalyst was prepared as a reference. The structures of the carrier and both catalysts were characterized by X-ray diffraction, scanning electron microscopy, and X-ray photoelectron spectroscopy, and the performances of both catalysts were evaluated in alcoholytic hydrogen production from sodium borohydride. On the carrier with the NiO-treated surface, the active component Ru developed a three-dimensional bush-like structure that enhanced the catalytic activity. Indeed, the hydrogen production from alcoholysis of sodium borohydride was three times higher on the Ru/NiO–Ni foam catalyst than on the Ru/Ni foam catalyst, and the highest rate exceeded 6 L/g/min. The repeated-use stability of the Ru/NiO–Ni catalyst (10 times) also exceeded that of Ru/Ni foam (8 times). However, as both catalysts used the same active component (i.e., Ru), their activation energies were almost identical.
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高影响因子
APPLIED SURFACE SCIENCE
·
2013
·
IF 2.112
Xia Wan,Meng Yuan,Shao-long Tie,Sheng Lan
By a hydrothermal method combining a subsequent calcination process, series of nano-scale NiO samples with different morphologies and sizes were synthesized and characterized. The effects of synthesis conditions including using different alkali reactants and being calcined at different temperatures on the characters of NiO samples have been investigated. In these characters the integrality of crystal structure and the crystallinity of NiO were found to become the determinative factors which affect the photocatalytic activity and process of NiO catalyst in the degradation of methylene blue (MB). The NiO sample which has a good crystallinity and small particle size (≤100 nm) possesses more shallowly trapped holes to react with chemisorbed oxhydryl OH − or H 2 O to generate OH radicals, exhibiting a high photocatalytic activity, furthermore, in this UV/NiO suspension the photocatalytic oxidation process of MB occurrs via the attack by OH radicals. The NiO sample which has a higher crystallinity and bigger particle size (>200 nm) possesses more deeply trapped holes ( h vb + ) to react directly with physisorbed organism, exhibiting a low photocatalytic activity, therefore, in this system the MB is oxidized by direct reacting with holes ( h vb + ).
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高影响因子
Journal of Energy Chemistry
·
2019
·
IF 5.162
Ju Fu,Wenbin Kang,Xiaodong Guo,Hao Wen,Tianbiao Zeng,Ruoxin Yuan,Chuhong Zhang
With the rapid emergence of wearable devices , flexible lithium-ion batteries (LIBs) are much more needed than ever. Free-standing graphene-based composite paper electrodes with various active materials have appealed wide applications in flexible LIBs. However, due to the prone-to-restacking feature of graphene layers , a long cycle life at high current densities is rather difficult to be achieved. Herein, a unique three-dimensional (3D) hierarchically porous NiO micro-flowers/graphene paper (fNiO/GP) electrode is successfully fabricated. The resulting fNiO/GP electrode shows superior long-term cycling stability at high rates (e.g., storage capacity of 359 mAh/g after 600 cycles at a high current density of 1 A/g). The facile 3D porous structure combines both the advantages of the graphene that is highly conductive and flexible to ensure rapid electrons/ions transfer and buffer the volume expansion of NiO during charge/discharge, and of the micro-sized NiO flowers that induces hierarchical between-layer pores ranging from nano-micro meters to promote the penetration of the electrolyte and prevent the re-stacking of graphene layers. Such structural design will inspire future manufacture of a wide range of active materials/graphene composite electrodes for high performance flexible LIBs.
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高影响因子
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2021
·
IF 3.927
Qian Ma,Hang Li,Jia Guo,Shushu Chu,Qi Zhang,Ziqiong Lin
Porous SnO 2 /NiO hollow nanofibers with effective surface transmission behavior have been prepared through a facile modified electrospinning method . The introduction of Ni component into the precursor solution can not only regulate the morphological evolution together with the nucleation and crystallization of oxide heterostructures at the elevated temperature action, but also significantly contribute to the enhancement of the gas-sensing performance for testing n-butanol gas. SnO 2 /NiO composites can present the highest response of 199 at the optimum operating temperature of 280 °C toward 100 ppm n-butanol gas, which is 4.5 times than that of pure SnO 2 nanofibers. Meanwhile, the response/recovery times of the sensors can be immensely decreased from 57/16 s of pure sample to 36/10 s as the adding amount of Ni component increasing to 5%, along with the superior selectivity and long-term stability toward n-butanol. The excellent gas-sensing properties of the sensors can be mainly attributed to the flourishing porous one-dimensional (1D) microstructure containing the closely connected p-n heterojunctions of SnO 2 and NiO, which can provide large specific surface areas with a mass of active sites to promote the reaction between n-butanol molecule and O δ− on the surface.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Lichong Peng,Jiaona Wang,Shiquan Guo,Congju Li
Developing high-porosity, flexible non-noble metal oxygen electrocatalysts for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) involving proton coupled electron transfer reaction is of essential importance for improving the efficiency of electrocatalysts. Herein, we propose a novel multilevel structure of Co/Co 3 O 4 -Ni/NiO doped macroporous interconnected hollow carbon nanofibers (Co/Co 3 O 4 -Ni/NiO@MHCNFs) as a self-standing and binder-free cathode catalyst for Li-O 2 batteries. We employed poly(styrene- co -acrylonitrile) (SAN) as a self-sacrificial template to fabricate hollow nanofibers by coaxial electrospinning and pyrolysis. Furthermore, macroporous interconnected hollow carbon nanofibers were achieved by fine-tuning the particle size of ZIF-8 and electrospinning parameters. Remarkably, as a proof-of-concept application, the Co/Co 3 O 4 -Ni/NiO decorated self-standing macroporous interconnected hollow carbon nanofibers (MHCNFs) electrodes exhibited significantly electrochemical performance, including a long-term cyclability (163 cycles) and maximum capacity (16623 mAh/g). This work rationally designs a scalable preparation of Co/Co 3 O 4 -Ni/NiO doped macroporous interconnected hollow carbon nanofibers, which provides a new idea for the design of self-supporting and binder-free oxygen electrocatalysts.
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高影响因子
IONICS
·
2023
·Vol. 29
·期 9
·3459-3471
·
IF 2.8
Ye Wenbin,Lei Jinxuan,Jiang Chaokui,Feng Zuyong,Xiong Deping,He Miao
Large capacity, high rate, and long-term cycling stabilities have always been pursued by lithium-ion batteries (LIBs). In this work, the straightforward hydrothermal and high-speed ball milling programs were employed to create the SnO 2 -NiO-C anode material. NiO nanoparticles with unique hexagonal crystal structure are an ideal choice for ion cycling and embedding, which can stabilize the structure and prevent SnO 2 from becoming coarser. The graphite encapsulated in the outer layer can effectively prevent volume expansion during the cycling as well. From the research results, SnO 2 -NiO-C exhibits a significant reversible capacity of 1224.3 mAh g −1 after 300 cycles at 0.2 A g −1 , and after the fourth cycle, the coulombic efficiency remains above 97%. And it also possesses a long-term cycling stability of 820.1 mAh g −1 after 1000 cycles at 1.0 A g −1 . Also, a significant rate property can reach 507.1 mAh g −1 even at 5.0 A g −1 . Therefore, the SnO 2 -NiO-C anode material for LIBs is promising because of its excellent electrochemical performance.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Chuang Zhang,Zheng Fang,Hao Cheng,Chandradip D. Jadhav,Jinquan Nie,Dezheng Liu,Yun Wang,Ying Liang
This study introduces a synergistic engineering strategy by integrating oxygen vacancies and redox-active Ni³ ⁺/Ni²⁺ pairs within a three-dimensional walnut-like NiO nanostructure, achieving unprecedented methanol oxidation reaction (MOR) performance. Specifically, the optimized NiO-450 catalyst, derived via a facile hydrothermal-freeze-drying-sintering route, exhibits a record-low Tafel slope of 145.1 mV/dec, high current density of 5.63 mA/cm², and superior stability under high methanol concentrations (up to 5 mol/L). Density functional theory (DFT) calculations revealed that oxygen vacancies play a crucial role in enhancing the catalytic performance, which is further elaborated in the results section. This work represents a paradigm shift in non-precious metal catalyst design, demonstrating that rational defect engineering combined with redox pair optimization can enhance MOR performance while addressing critical challenges in DMFC practicality.
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产品关联
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高影响因子
Sustainable Energy & Fuels
·
2022
·Vol. 6
·期 21
·4938-4947
·
IF 6.813
Weiwen Chen,Ziyu Geng,Shicong Zhu,Zenghui Qiu,Xin Zhang,Haijun Xu
Exploration of new MXene-based materials with excellent electrical conductivity and a high redox-active surface as high electrochemical performance supercapacitor electrodes is a very promising field. However, it remains challenging to have electrode materials that feature ultrahigh specific capacitance. In this work, NiO nanoflowers uniformly grow onto a V4C3TX substrate to form a core–shell hierarchical V4C3TX@NiO heterostructure, and then the heterostructure is incorporated into a 3D interconnected porous hydrogel via a hydrothermal graphene oxide (GO)-gelation method at low temperatures. Due to the synergistic effect among each components as well as the significant prevention of the aggregation of V4C3TX, the free-standing V4C3TX@NiO-reduced graphene oxide (RGO) heterostructured hydrogel electrodes exhibit an ultrahigh specific capacitance of up to 1009.5 F g−1 at 1 A g−1, in comparison to those of V4C3TX@NiO (665.3 F g−1) and V4C3TX (184 F g−1), excellent cycling stability (capacity retention rate is 97.4% for the device after 10 000 cycles at 10 A g−1), and a maximum energy density of 61.13 W h kg−1 at a power density of 526.32 W kg−1. This work highlights the unique potential of V4C3TX-based heterostructured hydrogels as inspired electrode materials for low-cost supercapacitor devices.
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高影响因子
ChemSusChem
·
2019
·Vol. 13
·期 7
·1890-1899
·
IF 7.804
Jie Zhu,Guolin Cao,Yuan Zhou,Yunjiao Li,Junchao Zheng,Dianwei Zhang
Graphical Spray pyrolysis and a solvothermal method were used to prepare two types of NiO–MnCo 2 O 4 –Ni 6 MnO 8 hybrid anode materials to compare their physical and electrochemical properties. The samples had similar hierarchical nanostructures, but that prepared by the solvothermal method had a smaller and more uniform particle size and larger BET surface area whereas those prepared by spray pyrolysis exhibited more regular morphology and more stable surface chemical states. New materials with different morphologies, nanostructures, and components can have structural advantages for application in materials science. Multicomponent-active hybrid nanostructured materials are among the best candidates for application in electrode materials. Spray pyrolysis and solvothermal synthesis are two popular methods for the preparation of multicomponent-active hybrid nanostructured materials. In this study, the two types of NiO-MnCo 2 O 4 -Ni 6 MnO 8 hybrid anode materials for use in lithium-ion batteries were synthesized by two different methods (spray pyrolysis and solvothermal synthesis), and the differences in their physical and electrochemical properties were compared. The two types of anode material exhibited the same hierarchical hybrid composition, but some different physical characteristics, which affected their electrochemical performance.
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PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2025
·
IF 8.3
Yi Liu,Weiqi Sun,Zhicheng Yang,Ruoyang Zhang,Bin Li,Lixian Sun,Fen Xu,Wenwei Guo,Conglong Shi,Ting Yu,Zhengyi Liang,Qingjie He
Magnesium hydride (MgH 2 ), recognized as a promising alternative energy material to replace fossil fuels, possesses distinct advantages, including higher stability and hydrogen storage capacity. Nevertheless, its widespread application remains limits due to intrinsic drawbacks such as high thermodynamic stability and sluggish hydrogen adsorption-desorption kinetics. Coral-like NiO/NiFe 2 O 4 heterojunction catalysts were efficaciously synthesized through a conventional hydrothermal-calcination method in our work. These catalysts were subsequently ball-milled with MgH 2 to obtain the MgH 2 –NiO/NiFe 2 O 4 composite. A comprehensive series of hydrogen storage performance (HSP) evaluations demonstrated that the composite exhibits markedly enhanced hydrogen adsorption-desorption characteristics. Specifically, MgH 2 –NiO/NiFe 2 O 4 initiated hydrogen release at 188 °C, which represents a 133 °C decrease compared with ball-milled MgH 2 . At 275 °C, its composite released 6.2 wt% H 2 within 20 min, while at a hydrogen absorption temperature of 100 °C, it absorbed 4.4 wt% H 2 within 30 min. Besides, the composite dehydrogenation activation energy was declined to 86.97 kJ/mol, a decrease of 62.17 kJ/mol relative to ball-milled MgH 2 . Mechanistic investigations revealed that NiO/NiFe 2 O 4 underwent in situ transformation into Mg 2 Ni and FeO during hydrogen adsorption-desorption process. Simultaneously, the reversible “Mg 2 NiH 4 /Mg 2 Ni” phase functioned as hydrogen pump, thereby accelerating the kinetics. First-principles calculations further demonstrated that Fe atoms in the in situ-generated FeO acquired electrons from the MgH 2 interface, which weakened the Mg–H bonds and facilitated hydrogen desorption. This electronic modulation of MgH 2 effectively enhanced its hydrogen adsorption-desorption dynamics and substantially lowered hydrogen desorption activation energy. To sum up, our study reports successful preparation of a binary transition-metal heterojunction catalyst, NiO/NiFe 2 O 4 , derived from Ni and Fe. The outcomes offer new thoughts into design and classification of transition-metal-based catalysts for hydrogen storage applications.
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高影响因子
Nanomaterials
·
2020
·Vol. 10
·期 8
·1502
·
IF 4.324
Yayong Li,Chunxiao Xu,Kaiyuan Liu,Pengwan Chen,Xin Gao
N-doped porous carbon encapsulated NiO/Ni composite nanomaterials (N-doped NiO/Ni@C) was successfully obtained by a one-step solution combustion method. This study demonstrates a one-step combustion method to synthesize n-doped porous carbon encapsulated NiO/Ni composite nanomaterials, using carbon dioxide as the carbon source, nickel nitrate as the nickel source, and hydrazine hydrate as the reaction solution. Spherical NiO nanoparticles with a particle size of 20 nm were uniformly distributed in the carbon matrix. The load of NiO/Ni can be controlled by the amount of nickel nitrate. The range of carbon content of recovered samples is 69–87 at%. The content of incorporated nitrogen for recovered samples is 1.94 at%. As the anode of lithium ion battery, the composite material exhibits high capacity, excellent multiplier performance and stable circulation performance. N-doped NiO/Ni@C-2 was applied to lithium ion batteries, and its reversible capacity maximum is 980 mAh g−1after 100 cycles at the current density of 0.1 A g−1. Its excellent electrochemical properties imply its high potential application for high-performance lithium-ion battery anode materials.Keywords:combustion synthesis;CO2reduction;porous carbon;nickel oxide;hydrazine hydrate;lithium ion battery;nanocomposite
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高影响因子
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