INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2019
·
IF 4.084
Peng Wang,Xiao Zhang,Yan Wei,Ping Yang
Ni/NiO nanoparticles (NPs) were encapsulated in one dimensional (1D) graphitic nanofibers using a two-step calcination route. The precursor fibers obtained by electrospinning were heated in air at a low temperature firstly, followed by calcination at high temperature in Ar. With changing the amount of Ni precursors and preparation conditions, the morphology of resulting samples were adjusted from porous nanofiber to nanotube-loaded bulky material. The sizes and distribution of Ni/NiO NPs also changed. These NPs were in and on the nanofibers or located on the top of nanotubes. Electrochemistry test results indicate that resulting sample revealed enhanced electrocatalytic hydrogen evolution reaction (HER) when the precursor contained 0.5 mmol Ni. In an alkaline medium , the current density of samples could reach up to 280 mA cm −2 . This is ascribed to the homogeneous distribution of Ni/NiO NPs and the porous structure of nanofibers with a large surface area of 251 m 2 /g. In contrast, the HER performance of nanotube-loaded bulky material get worse due to the disadvantage of specific surface area .
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ACS Applied Nano Materials
·
2021
·
IF 5.097
Jianguang Yuan,Haixiang Huang,Zan Jiang,Yujie Lv,Bogu Liu,Bao Zhang,Youhua Yan,Ying Wu
Borohydride magnesium is widely studied as a promising hydrogen storage material due to its high gravimetric and volumetric density (14.9 wt % and 112 g/L, respectively). Different types of catalysts play a good catalytic role in enhancing the hydrogen desorption rates in borohydride systems. In the present paper, multiwalled carbon nanotubes supported Ni (Ni/MWCNTs) were synthesized by a chemical reduction method, and the catalyst was introduced into Mg(BH4)2 to enhance the dehydrogenation kinetics. The effect of Ni/MWCNTs on the microstructural evolution and hydrogen storage properties of Mg(BH4)2 is studied. The Mg(BH4)2-5wt% Ni/MWCNTs (95M@5NiMWCNTs) sample exhibits the best hydrogen storage performance; it starts to release hydrogen at 93 °C, which is 113 °C lower than that of the primary Mg(BH4)2 sample. Moreover, it takes only 3600 s to desorb hydrogen completely at 300 °C, showing a significant improvement on hydrogen desorption kinetics. In comparison with the primary Mg(BH4)2 sample, the dehydriding apparent activation energy of the 95M@5Ni3MWCNTs2 sample is significantly lowered to 119.5 kJ mol–1. Transmission electron microscopy analysis exhibits that the striking improvement of dehydriding properties of Mg(BH4)2 is mainly due to the synergistic catalysis of Ni and MWCNTs. This work provides a new method for designing and synthesizing high-performance catalysts in borohydride hydrogen storage materials, which is potentially utilized as a hydrogen supplier for hydrogen fuel cells.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Wenyao Xue,Hongliang Fu,Guanjie Xue,Jing Zhao,Yue Lian,Zhifeng Wang,Yongfeng Hu,Huaihao Zhang
The oxygen evolution reaction (OER), a half-process of water electrolysis, involves four electron transfer processes with a high energy barrier, leading to slow reaction kinetics. Developing stable and high-efficiency OER electrocatalysts remains a major challenge in field of water electrolysis. Here, a novel Ni-doping V 2 O 5 @NC nanoflower-like catalyst is synthesized for OER reaction. Specifically, Ni-V 2 O 5 @NC is obtained by incorporating Ni into V 2 O 5 through a simply hydrothermal- carbonization process, using NH 4 VO 3 , Ni(NO 3 ) 2 ·6 H 2 O and H 2 C 2 O 4 · 2 H 2 O as raw materials. This approach can improve the OER activity and stability of V 2 O 5 . Ni-V 2 O 5 @NC presents the following advantages. Firstly, Ni-doping combined with nanoflower structure improves the reaction activity. Ni-doping generates more electrochemical active sites, facilitating the adsorption/desorption process of reaction intermediates and electron transfer, thereby enhancing catalytic activity. Besides, the nanoflower-like structure provides a relatively high specific surface area and more active sites to participate in the reaction, thus boosting the catalytic reactivity. Secondly, Ni with high conductivity and its doping into V 2 O 5 causes structural and performance changes of material, reducing the charge transfer resistance and optimizing the conductive property. Meanwhile, the inherent N and C from hydrothermal reaction also increase material conductivity. Also, Ni doping inhibits the stacking of V 2 O 5 lamellar structure while maintaining the catalyst’s activity, structural integrity and the improved stability. The electrochemical analysis results show Ni-V 2 O 5 @NC good electrochemical performance. Ni-60-V 2 O 5 @NC features a low overpotential (300 mV@10 mA cm −2 ) and a small Tafel slope (74.2 mV dec −1 ) in OER. Additionally, the overpotential of Ni-60-V 2 O 5 @NC only increases by 3 mV after 1000 cycles stability tests.
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高影响因子
KEY ENGINEERING MATERIALS
·
2012
·
IF 0
Hai Feng Chen,Ting Yan
New nano nickel-doped titanium dioxide composites had been produced by a conducting sol-gel method. The alginate gel was used as a template to prevent the conglomeration of the inorganic materials. In this experiment, nickel nitrate, tetrabutyl titanate and sodium alginate were used as main materials to prepare different amount nickel-doped TiO2 particles. The amount of Ni was studied from 0 to 9 mol.-% (where mol.-% refers to the Ni/TiO2 molar ratio), and the Ni/TiO2 composites were characterized by XRD, FT-IR, TG-DTA, and we carried out doping amount, catalyst amount and illumination time influence on photocatalytic performance of nano Ni/TiO2 composite in aqueous methyl orange. The activity of TiO2 gradually increased with the increasing of doping amount, and there was highest catalytic efficiency when Ni = 9 % mol.
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DOI
Nature Communications
·
2023
·Vol. 14
·期 1
·1-9
·
IF 16.6
Zang Ying,Lu Di-Qiu,Wang Kun,Li Bo,Peng Peng,Lan Ya-Qian,Zang Shuang-Quan
Catalysts capable of electrochemical overall water splitting in acidic, neutral, and alkaline solution are important materials. This work develops bifunctional catalysts with single atom active sites through a pyrolysis-free route. Starting with a conjugated framework containing Fe sites, the addition of Ni atoms is used to weaken the adsorption of electrochemically generated intermediates, thus leading to more optimized energy level sand enhanced catalytic performance. The pyrolysis-free synthesis also ensured the formation of well-defined active sites within the framework structure, providing ideal platforms to understand the catalytic processes. The as-prepared catalyst exhibits efficient catalytic capability for electrochemical water splitting in both acidic and alkaline electrolytes. At a current density of 10 mA cm −2 , the overpotential for hydrogen evolution and oxygen evolution is 23/201 mV and 42/194 mV in 0.5 M H 2 SO 4 and 1 M KOH, respectively. Our work not only develops a route towards efficient catalysts applicable across a wide range of pH values, it also provides a successful showcase of a model catalyst for in-depth mechanistic insight into electrochemical water splitting.
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PubMed
高影响因子
JOM
·
2020
·Vol. 72
·期 12
·4458-4465
·
IF 2.054
Lv Xiangyong,Liang Guangfen,Wang Qinzheng,Li Yandong,Duan Huamei,Chen Dengfu,Long Mujun,Hu Qingqing,Han Funian,Li Linpei
In this study, we prepared reduced graphene oxide (rGO) from natural graphite by a redox method. The salts Cu(NO 3 ) 2 and Ni(NO 3 ) 2 , Cu(NO 3 ) 2 and Zn(NO 3 ) 2 , Cu(NO 3 ) 2 , Ni(NO 3 ) 2 , and Zn(NO 3 ) 2 are loaded onto rGO by an impregnation method. The support material is calcined to obtain the fresh catalyst. The catalysts are analyzed by thermogravimetric analysis, x-ray diffraction, x-ray photoelectron spectroscopy, Raman analysis, and scanning and transmission electron microscopic imaging. The results showed that Ni and Zn are evenly distributed on the carrier. The size of the copper crystals in CuNi-rGO and CuZn-rGO is smaller than that of Cu-rGO. The smaller the copper crystal, the more easily Cu 2+ can be reduced to Cu 0 and Cu + .
The addition of Ni and Zn can promote reduction of Cu 2+ to Cu 0 and Cu + and may significantly improve the catalytic performance.
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高影响因子
FUEL
·
2025
·
IF 7.5
Qichao Liang,Fei Lu,Farhat Shakeel,Xueying Wang,Yilin Sun,Jiefang Wang,Hai Huang,Jinrui Su,Bin Cai
The porous structure of anodes is crucial to the performance of intermediate-temperature solid state fuel cells (IT-SOFCs). With the rapid development of high performance cathodes, the role of anodes needs to be considered again. A hierarchical porous Ni-Ce 0.8 Sm 0.2 O 2-δ (SDC) anode consisted of ∼200 nm width, and ∼800 nm and ∼10 μm diameter pores can be formed by reducing NiO, and burning of polymethyl methacrylate (PMMA) and starch pore-formers with a total load of 20 wt%, respectively. For single cells with Ni-SDC|SDC|Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3-δ configuration, the peak power density (PPD) (0.26–1.73 W·cm −2 ) at 723–923 K is achieved with the addition of 10 wt% starch + 10 wt% PMMA, which is 136–52 % and 86-14 % higher than that without pore-formers and with 20 wt% starch, respectively. More importantly, it has a similar long-term stability of the cell without pore-formers. The comprehensive results suggest that the apparent improvement in PPDs is primarily attributed to the increased length of effective three-phase boundaries due to the formation of a percolation network of anodes, while also highlighting the significant influence of anode/electrolyte interface polarization on the electrochemical performance of IT-SOFCs.
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ACS Catalysis
·
2015
·
IF 9.312
Ruiyan Sun,Mingyuan Zheng,Jifeng Pang,Xin Liu,Junhu Wang,Xiaoli Pan,Aiqin Wang,Xiaodong Wang,Tao Zhang
The direct hydrogenolysis of cellulose represents an attractive and promising route for green polyol production. Designing a catalyst system that could control the selectivity of polyols of this process is highly desirable. In this work, we realized the selectivity-switchable production of ethylene glycol (EG) and 1,2-propylene glycol (1,2-PG) by using Sn species with different valences in combination with Ni catalysts. The combination of Ni/AC and metallic Sn powders exhibited a superior activity toward EG (57.6%) with up to 86.6% total polyol yield, while the combination of Ni/AC and SnO favored the formation of 1,2-PG (32.2%) with a 22.9% yield of EG. The Sn species in NiSn alloy in situ formed from metallic Ni and Sn powders was found to be the active sites for the high selectivity of EG as evidenced by control experiments and characterizations including X-ray diffraction, X-ray photoelectron spectroscopy, high-resolution transmission electron microscopy, energy dispersive X-ray mapping, and 119Sn Mössbauer spectroscopy. The effects of Sn loading, reaction temperature, reaction time, and the concentration of cellulose were investigated for Ni/AC + Sn powders. Because of the formation of NiSn alloy, the Ni–Sn catalyst showed good stability during repeated use. Experimental results disclosed that the Sn species with different valence possessed distinct catalytic functions. Both SnO and the alloyed Sn species could catalyze the retro-aldol condensation of glucose to glycolaldehyde, and meanwhile, SnO was also active for the isomerization of glucose to fructose. Therefore, controlling the glycol products distribution could be realized using SnO or the alloyed Sn species as catalysts.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Hui Liang,Hao Zhang,Yi Zong,Heng Xu,Jun Luo,Xijun Liu,Jie Xu
Doping engineering is an effective strategy to improve the hydrogen storage capacity of magnesium-based materials. Here, we report a magnesium composite containing trace amounts of nickel catalyst (Ni-Mg), in which Ni and Mg layers form a new structural phase. The test shows that Ni-Mg composite has a hydrogen storage capacity of 7.5 wt%, with rapid absorption/desorption kinetics and stable reversible absorption/desorption performance on cycling. Ni-Mg exhibits a superior hydrogen storage performance as compared to the MgNi alloys and Mg-based materials previously reported in the literature. We conclude that a new MgNi phase and MgNi 2 intermetallic compound are formed during the H 2 adsorption process . Based on the theoretical calculations, we show that Ni facilitates hydrogenation by accelerating the dissociation of H 2 molecules into the H atoms, while the MgNi phase formed during the hydrogenation is conducive to the subsequent dehydrogenation, promoting H atoms diffusion between the subsurface and the surface. This work provides a guidance for the development of the efficient hydrogen storage materials .
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2017
·
IF 5.401
Wen-Tao Li,Xiao-Dong Zhang,Xin Guo
Ni-doped SnO 2 nanofiber array was prepared from a modified electrospinning technique followed with hot-press and calcination, which impart the nanofiber with high crystallinity as well as good adhesion to the substrate. The nanofiber array consists of well-aligned straight fibers with an average diameter of ∼200 nm and length of several millimeters. Each fiber consists of rutile-structured polycrystals with an average grain size of ∼5 nm. Conductometric gas sensors were developed from the nanofiber array using magnetron sputtering. These sensors show excellent performance for NO 2 detection at 250 °C, including high response (90.3 under 20 ppm), fast response and recovery (40 s/18 s), and above all, excellent selectivity. Beneficial for electron transport, the nanofiber array offers better device performance over random nanofibers on sensing response and time for recovery. In addition, the NO 2 sensing mechanism was probed with detailed DRIFT and XPS analysis.
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高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2019
·Vol. 27
·期 1
·812-822
·
IF 2.914
Xu Suyun,Yan Ning,Cui Minghao,Liu Hongbo
In this study, ozone-oxidation was used to treat synthetic chemical plating solution containing Cu(II)/Ni(II)-EDTA solution to realize the purpose of decomplexation. The effects of solution pH, initial concentration of Cu(II)/Ni(II)-EDTA, the molar ratio of EDTA to Cu(II)/Ni(II), and the coexistence of Cu(II)/Ni(II) on their removal efficiencies were investigated. The degradation of EDTA-Cu(II) and EDTA-Ni(II) were mainly attributed to OH oxidation, and the removal rates of Cu(II)/Ni(II) depend on the complete decomplexation. The removal rates of Cu(II) and Ni(II) was affected by the pH of solution, and the optimal pH was found to be 7–9; nevertheless, their removal rates can still be up to 90% even in acidic pHs of 3~5. When the molar ratio of EDTA to Cu(II)/Ni(II) increased from 1:1 to 3:1, the kinetics of metal ion removal rate declined from 0.0788 and 0.1139 min -1 to 0.0250 and 0.0271 min -1 . The synergistic effect was found in the Cu(II)/Ni(II) blended system due to the higher catalytic capability and the lower complexation affinity toward EDTA for Ni(II). In summary, ozone oxidation can be considered as an effective technology to realize the complete decomplexation of Cu(II)/Ni(II)-EDTA that contained in chemical plating industry wastewater.
Graphical Abstract
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Zihan Lv,Zeng Hong,Da Ke,Chao Qian,Xinzhi Chen,Shaodong Zhou
The selective hydrogenation of nitrile compounds represents a pivotal area of research within both industrial and academic catalysis. In this study, we prepared Ni-Cu bimetallic catalysts through a co-deposition-crystallization sequence, aimed at the efficient production of primary and secondary amines. The enhanced selectivity for primary amines is attributed to the downshift of the d-band center of Ni 0.1 Cu, which weakens the adsorption of key imine intermediates. Consequently, the synthesized Ni-Cu catalysts demonstrated exceptional catalytic performance in the selective hydrogenation of nitrile compounds, including those with reduction-sensitive functional groups such as −Cl and −Br, achieving 100 % conversion efficiency and significant yields ranging from 80 % to 99 %. The reaction conditions were comprehensively optimized, taking into account factors such as temperature, solvent, time, additives, and hydrogen pressure. Furthermore, the catalytic performance of Ni 0.1 Cu and Ni 0.4 Cu in the selective hydrogenation of nitriles was sustained over at least five reaction cycles. Temperature-programmed desorption results elucidated the structure–activity relationship, revealing that a strong interaction site prevails in Ni 0.4 Cu, while a weaker or moderate interaction site in Ni 0.1 Cu is responsible for the formation of primary amines. Theoretical calculations indicate that the reaction proceeds via an imine mechanism, with benzylideneimine serving as a key intermediate. This work may stimulate further research into the development of bimetallic nano-catalysts for selective nitrile hydrogenation in industrial catalytic processes.
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PubMed
高影响因子
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