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ni nanoparticles supported on carbon as efficient catalysts for the hydrolysis of ammonia borane

Nano Research 2014年第5期7卷 774-781页

作者： Limin Zhou Tianran Zhang Zhanliang Tao Jun Chen Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education) Chemistry College Collaborative Innovation Centerof Chemical Science and Engineering Nankai University Tianjin 30007 I China

We report on the preparation of three kinds of ni nanoparticles supported on carbon （ni/C） and their application in the catalytic hydrolysis of ammonia borane （AB）. Three ni/C catalysts were prepared from a ni metal-organic framework （ni-MOF） precursor by reduction with KBI-G calcination at 700 ℃ under Ar, and a combination of calcination and reduction, the products being denoted as ni/C-1, ni/C-2, and ni/C-3, respectively. The structure, morphology, specific surface area, and element valence were characterized by X-ray diffraction （XRD）, scanning electron microscopy （SEM）, transmission electron microscopy （TEM）, nitrogen adsorption-desorption measurements, and X-ray photoelectron spectra （XPS）. The results demonstrate that ni/C-1 is composed of amorphous ni particles agglomerated on carbon, ni/C-2 is characteristic of crystalline ni nanoparticles （about 10 nm in size） supported on carbon with ni oxidized on the surface, while the surface of the ni particles in ni/C-3 is less oxidized. The specific surface areas of ni-MOF, ni/C-1, ni/C-2, and ni/C-3 are 1239, 33, 470, and 451 m2·g-1, respectively. The catalytic hydrolysis of AB with ni/C-3 shows a hydrogen generation rate of 834 mL-min^-1·g-1 at room temperature and an activation energy of 31.6 kJ/mol. ni/C-3 shows higher catalytic activity than other materials, which can be attributed to its larger surface area of crystalline ni. This study offers a promising way to replace noble metal by under ambient conditions. ni nanoparticles for AB hydrolysis

关键词： ni nanoparticles ammonia borane catalytic hydrolysis hydrogen generation

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ni nanoparticles encapsulated within H-type ZSM-5 crystals for upgrading palmitic acid to diesel-like fuels

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Chinese Chemical Letters 2022年第2期33卷 803-806页

作者： Yanchun Shi Chen Gao Enhui Xing Jimei Zhang Feng Duan He Zhao Yongbing Xie CAS Key Laboratory of Green Process and Engineering Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China State Key Laboratory of Catalytic Materials and Reaction Engineering Research Institute of Petroleum ProcessingSinopecBeijing 100083China

Meso-ni@HZSM-5 bi-functional catalysts were successfully post-encapsulated with about 3-7 nm ni nanoparticles within HZSM-5 crystals,which exhibited significantly efficient conversion activity(67.4 g[palmitic acid]g[ni]^(−1)h^(−1))of palmitic acid and 100%selectivity of hydrocarbons with the outstanding stability during recycling application,compared to the impregnated ni/HZSM-5 catalyst(14.0 g[palmitic acid]g[ni]^(−1)h^(−1)).

关键词： Post-encapsulation ni@HZSM-5 ni nanoparticles Palmitic acid Hydrodeoxygenation Hydrocarbons

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High-loading, ultrafine ni nanoparticles dispersed on porous hollow carbon nanospheres for fast (de)hydrogenation kinetics of MgH_(2)

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Journal of Magnesium and Alloys 2022年第12期10卷 3354-3366页

作者： Shun Wang Mingxia Gao Zhihao Yao Kaicheng Xian Meihong Wu Yongfeng Liu Wenping Sun Hongge Pan State Key Laboratory of Silicon Materials Key Laboratory of Advanced Materials and Applications for Batteries of Zhejiang Province&School of Materials Science and EngineeringZhejiang UniversityHangzhou 310027P.R.China

Magnesium hydride(MgH2) is one of the most promising hydrogen storage materials for practical application due to its favorable reversibility, low cost and environmental benign;however, it suffers from high dehydrogenation temperature and slow sorption *** proper catalysts with high and sustainable activity is extremely desired for substantially improving the hydrogen storage properties of MgH2. In this work, a composite catalyst with high-loading of ultrafine ni nanoparticles(NPs) uniformly dispersed on porous hollow carbon nanospheres is developed, which shows superior catalytic activity towards the de-/hydrogenation of MgH2. With an addition of 5wt% of the composite, which contains 90 wt% ni NPs, the onset and peak dehydrogenation temperatures of MgH2are lowered to 190 and 242 ℃, respectively. 6.2 wt% H2is rapidly released within 30 min at 250 ℃. The amount of H2that the dehydrogenation product can absorb at a low temperature of 150 ℃ in only 250 s is very close to the initial dehydrogenation value. A dehydrogenation capacity of 6.4wt% remains after 50 cycles at a moderate cyclic regime, corresponding to a capacity retention of 94.1%. The ni NPs are highly active,reacting with MgH2and forming nanosized Mg2ni/Mg2niH4. They act as catalysts during hydrogen sorption cycling, and maintain a high dispersibility with the help of the dispersive role of the carbon substrate, leading to sustainably catalytic activity. The present work provides new insight into designing stable and highly active catalysts for promoting the(de)hydrogenation kinetics of MgH2.

关键词： Hydrogen storage materials Nano-catalysis Magnesium hydride Porous hollow carbon nanospheres ni nanoparticles

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Effects of PVP on the preparation and growth mechanism of monodispersed ni nanoparticles

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Rare Metals 2008年第6期27卷 642-647页

作者： LIU Xiaodan GUO Min ZHANG Mei WANG Xidong GUO Xiao CHOU Kuochih Department of Physical Chemistry University of Science and Technology Beijing Beijing 100083 China College of Engineering Peking University Beijing 100871 China

Monodispersed ni nanoparticles were successfully prepared by chemical reduction with hydrazine hydrate in ethylene glycol. The effect of the amount of polyvinylpyrrolidone （PVP-K30） on the preparation of ni nanoparticles was investigated. X-ray diffraction （XRD）, transmission electron microscopy （TEM）, and high resolution transmission electron microscopy （HRTEM） were employed to characterize the nickel powders. The average nickel particle size can be controlled from 103 nm to 46 ran with increasing the mass ratio of PVP to niCl2·6H2O. The particles are spherical in shape and are not agglomerated. A possible extensive mechanism of nickel nanoparticle formation has been suggested.

关键词： ni nanoparticles nucleation mechanism chemical reduction PVP

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Preparation of ni nanoparticles plating by electrodeposition using reverse microemulsion as template

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Journal of Central South University 2010年第1期17卷 40-44页

作者：周海晖彭春玉付超鹏安静邹贺王一栋许岩旷亚非 College of Chemistry and Chemical Engineering Hunan University State Key Laboratory for Chemo/Biosensing and Chemometrics Hunan University

ni nanoparticles plating was prepared in reverse microemulsion. The deposition was carried out through the Brownian motion of water pools in the reverse microemulsion and the adsorption of water pools on the electrode surface. Effects of electrolytic parameters on the size of ni particles were studied. The performances of hydrogen evolution and hydrogen storage of the ni nanoparticles plating electrode were also investigated. The results indicate that the size of ni nanoparticles decreases with the increase of ni2+ concentration and the decrease of current density. The electrochemical activity of ni nanoparticles plating electrode is much higher than that of bulk ni electrode.

关键词： ni nanoparticles reverse microemulsion electrodeposition electrolytic parameters

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Regulating the intrinsic electronic structure of carbon nanofibers with high-spin state ni for sodium storage with high-power density

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Journal of Materials Science & Technology 2024年第4期171卷 16-23页

作者： Zhijia Zhang Gang Xie Yuefang Chen Yanhao Wei Mengmeng Zhang Shulei Chou Yunxiao Wang Yifang Zhang Yong Jiang School of Materials Science and Engineering Institute of Quantum Materials and DevicesState Key Laboratory of Separation Membrane and Membrane ProcessesTiangong UniversityTianjin 300387China Institute for Carbon Neutralization College of Chemistry and Materials EngineeringWenzhou UniversityWenzhou 325035China Institute for Superconducting and Electronic Materials University of WollongongWollongongNSW 2522Australia

Carbon nanofibers(CNFs)with high specific surface area show great potential for sodium storage as a hard carbon ***,CNFs anchored with ni nanoparticles(CNFs/ni)were prepared through chemical vapor deposition and impregnation reduction methods,in situ growing on the three-dimensional porous copper current collector(3DP-Cu).The coupling effect of high-spin state ni nanopar-ticles leads to the increase of defect density and the expansion of lattice spacing of ***,the 3DP-Cu ensures a high loading capacity of CNFs and short ion/electron transport *** an integral binder-free anode,the 3DP-Cu/CNFs/ni exhibits excellent electrochemical performance,which demon-strates a high specific capacity with 298.5 mAh g^(-1)at 1000 mA g^(-1)after 1500 cycles,and a high power density with 200 mAh g^(-1)over 1000 cycles at 5000 mA g^(-1).Density functional theory calculation re-sults show that the high-spin state ni regulates the electronic structure of CNFs,which significantly reduces the adsorption energy for Na^(+)(-2.7 Ev)and thus enables high-rate *** regulation of the electronic structure of carbon materials by high-spin state metal provides a new strategy for developing high-power carbonaceous anode materials for sodium-ion batteries.

关键词： Carbon nanofibers ni nanoparticles High-spin state Sodium-ion batteries Anode materials Density functional theory calculation

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Preparation of ni/PZT Core-shell nanoparticles and Their Electromagnetic Properties

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Journal of Wuhan University of Technology(Materials Science) 2018年第1期33卷 9-14页

作者：范桂芬 XU Xing WANG Xiaochuan LU Wenzhong LIANG Fei WANG Kai School of Optical and Electronic Information Huazhong University of Science and Technology Key Lab of Functional Materials for Electronic Information MOE Huazhong University of Science and Technology

The ni nanoparticles coated with Pb（Zr,Ti）O3（PZT） were synthesized by a sol-gel method and in situ reaction. And their structure, oxidation resistance, and electromagnetic properties were investigated. The X-ray diffraction patterns（XRD） exhibited that a small amount of impure phase characterized to ni（OH）2 was detected from the ammonia-treated ni nanoparticles and the ammonia-treated ni nanoparticles coated with PZT. After being pre-treated with aqueous ammonia, the PZT coating layer was more uniform and about 10 nm in thickness. The oxidation resistance of the ammonia-treated ni nanoparticles coated with PZT, compared with that of the non-treated ones, was improved by about 66 ℃. The PZT shell layer prepared by in-situ reaction can greatly reduce the dielectric constant and improve the natural resonance loss at high frequency, so as to obtain the optimal impedance matching performance of the electromagnetic wave transmission.

关键词： ni nanoparticles sol-gel method in situ reaction PZT coating layer electromagnetic property

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Carbonization fabrication of a piezoresistive sensor with improved sensitivity via ni decoration of carbonized cotton fibers

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Science China(Technological Sciences) 2022年第12期65卷 3000-3009页

作者： HE Xiang WANG FengMing LIANG YiYing WU JiaWei LIANG JiongHong SHEN GengZhe LI BaiJun SU DaoJian ZHANG Chi SONG WeiDong HE Xin School of Applied Physics and Materials Wuyi UniversityJiangmen 529020China School of Materials and Energy Guangdong University of TechnologyGuangzhou 510006China

The development of wearable electronics urgently requires the cost-effective and scalable fabrication of high-performance pressure *** work aims to develop a simple carbonization strategy to facilitate sensor sensitivity by decorating discrete nickel nanoparticles on carbonized cotton fibers(CCFs).The increased air gap between the fibers at the unloading state,as well as the enlargement of the deformation distance and the contact area between the conductive materials at the loading state,contribute to a more significant resistance ***,the sensitivity of the piezoresistive sensor is improved more than 5 times within 1 N by introducing ni nanoparticles,and it is characterized by a rapid response(~160 ms)and recovery(~100 ms),wide detection range(~20 N/~130 kPa),and good durability(~4000 cycles).The flexible sensor has been successfully demonstrated to monitor human movements,physical stimuli,and pressure ***,the proposed device can control temperature accurately as a uniform and large-scale *** work reveals that the ni@CCFs-based sensor is prospective in wearable electronics,artificial intelligence,health monitoring,medical diagnosis and treatment.

关键词： carbonized cotton fabric ni nanoparticles flexible piezoresistive sensor wearable device

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Size-effect on ni electrocatalyst:The case of electrochemical benzyl alcohol oxidation

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Nano Research 2023年第1期16卷 202-208页

作者： Jian Zhong Yongli Shen Pei Zhu Shuang Yao Changhua An Tianjin Key Laboratory of Organic Solar Cells and Photochemical Conversion School of Chemistry and Chemical EngineeringTianjin University of TechnologyTianjin 300384China Tianjin Key Laboratory of Advanced Functional Porous Materials Institute for New Energy Materials&Low-Carbon TechnologiesSchool of Materials Science and EngineeringTianjin University of TechnologyTianjin 300384China

The nanoparticles(NPs)of ni with different sizes endows its distinctive physical and chemical properties,which represents a typical strategy for the development of high-performance ***,the size effect of metallic ni-NPs on electrocatalytic performance remains ***,the ni-NPs with different sizes supported on nitrogen doped carbon(NC)has been synthesized by controlling the pyrolysis temperature,leading to the synthesis of ni@NC-500(8.3 nm),ni@NC-280(1.9 nm)and ni@NC-200(1.0 nm).The electrooxidation of benzyl alcohol(BA)over these nanocatalysts shows the yield of benzoic acid was 99%,82%,55%on ni@NC-280,ni@NC-200 and ni@NC-500,*** experimental and theoretical simulation demonstrate that the difference in the adsorption strength of reactant molecules by ni-NPs is responsible for their different performance,where the ni@NC-280 exhibits an optimal adsorption configuration between ni@NC-280 electrode and *** work provides a new angle for designing and synthesizing efficient electrocatalysts,which may be extended to the exploration of various promising electrocatalytic systems.

关键词： size effect electro-oxidation ni nanoparticles benzyl alcohol

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nickel embedded porous macrocellular carbon derived from popcorn as sulfur host for high-performance lithium-sulfur batteries

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Journal of Materials Science & Technology 2021年第15期74卷 69-77页

作者： Wenjuan Wang Yan Zhao Yongguang Zhang ning Liu Zhumabay Bakenov School of Materials Science and Engineering Hebei University of TechnologyTianjin 300130China Institute of Batteries LLC School of Engineering and Digital SciencesNational Laboratory AstanaNazarbayev University53 Kabanbay Batyr AvenueNur-Sultan 010000Kazakhstan

Due to the demands for high performance and ecological and economical alternatives to conventional lithium-ion batteries(Li Bs),the development of lithium-sulfur(Li-S)batteries with remarkably higher theoretical capacity(1675 m A h g-1)has become one of the extensive research focus directions ***,poor conductivity of sulfur,critical cyclability problems due to shuttle of polysulfides as intermediate products of the cathodic reaction,and large volume variation of the sulfur composite cathode upon operation are the major bottlenecks impeding the implementation of the next-generation Li-S *** this work,a unique three-dimensional(3D)interconnected macrocellular porous carbon(PC)architecture decorated with metal ni nanoparticles was synthesized by a simple and facile *** as-fabricated ni/PC composite combines the merits of conducting carbon skeleton and highly adsorptive abilities of ni,which resulted in efficient trapping of lithium polysulfides(Li PSs)and their fast conversion in the electrochemical *** to these synergistic advantageous features,the composite exhibited good cycling stability(512.3 mA h g^(-1)after 1000 cycles at 1 C with an extremely low capacity fading rate 0.03%per cycle),and superior rate capability(747.5 mA h g^(-1)at 2 C).Accordingly,such ni nanoparticles embedded in a renewable puffed corn-derived carbon prepared via a simple and effective route represent a promising active type of sulfur host matrix to fabricate high-performance Li-S batteries.

关键词： Biomass-derived porous carbons Cathodes Lithium-sulfur batteries ni nanoparticles

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