CATALYSIS LETTERS
·
2013
·Vol. 143
·期 9
·873-880
·
IF 2.244
Yang Lan,Luo Wei,Cheng Gong-Zhen
Abstract Amorphous nickel catalysts derived from nickel halides (NiF 2 , NiCl 2 , NiBr 2 , NiI 2 ) were in situ synthesized in an aqueous solution of NaBH 4 /NH 3 BH 3 . The halide anions have effects on the formation of Ni(0) catalysts, which can further affect the catalytic activities and activation energies of the catalysts for the hydrolysis of ammonia borane. The PVP stabilized catalysts have higher hydrogen evolution rates and durabilities than bare Ni catalysts for the hydrolysis of ammonia borane. The catalysts derived from NiBr 2 stabilized by PVP present the highest catalytic activity and the lowest activation energy, which has been measured to be 25.58 kJ/mol. This value is lower than most of reported Ni-based catalysts and even noble-metal containing catalysts. The results of mercury poisoning experiment reveal that Ni(0) catalysts derived from NiBr 2 are heterogeneous catalysts in the hydrolysis of ammonia borane. Graphical Abstract
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2016
·
IF 2.628
Junjie Zhang,Fang Lu,Weiqiang Yu,Rui Lu,Jie Xu
Lactic acid is produced as a major byproduct during sorbitol hydrogenolysis under alkaline conditions. We investigated the effects of two different alkaline additives, Ca(OH) 2 and La(OH) 3 , on lactic acid formation during sorbitol hydrogenolysis over Ni/C catalyst. In the case of Ca(OH) 2 , the selectivity of lactic acid was 8.9%. In contrast, the inclusion of La(OH) 3 resulted in a sorbitol conversion of 99% with only trace quantities of lactic acid being detected. In addition, the total selectivity towards the C2 and C4 products increased from 20.0% to 24.5% going from Ca(OH) 2 to La(OH) 3 . These results therefore indicated that La(OH) 3 could be used as an efficient alkaline additive to enhance the conversion of sorbitol. Pyruvic aldehyde, which is formed as an intermediate during sorbitol hydrogenolysis, can be converted to both 1,2-propylene glycol and lactic acid by hydrogenation and rearrangement reactions, respectively. Notably, these two reactions are competitive. When Ca(OH) 2 was used as an additive for sorbitol hydrogenolysis, both the hydrogenation and rearrangement reactions occurred. In contrast, the use of La(OH) 3 favored the hydrogenation reaction, with only trace quantities of lactic acid being formed.
✓ 已验证
产品关联
DOI
高影响因子
Analytical Methods
·
2014
·Vol. 6
·期 18
·7496-7501
·
IF 1.938
Xiaoqian Ouyang,Yaping Ding,Xi Ba,Shuqing Gu
A poly-Ni(II)–curcumin (curcumin: 1,7-bis[4-hydroxy-3-methoxyphenyl]-1,6-heptadiene-3,5-dione) composite film modified electrode was prepared for amperometric determination of β-nicotinamide adenine dinucleotide (NADH). Scanning electron microscopy and Energy Dispersive X-ray spectroscopy were used to examine the morphology and interface property of the Ni(II)–curcumin film. Under optimum conditions, the amperometric detection of NADH provided a wide linear detection range (0.3–300 μM), high sensitivity (230.02 μA mM−1 cm−2) and low limit of detection (LOD = 0.18 μM, S/N = 3). Moreover, the modified electrode showed good stability and reproducibility, indicating that it can improve the analysis signal of NADH in a very convenient way.
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2014
·
IF 4.086
Huanmei Ma,Jianhua Tian,Shuming Bai,Xiaodong Liu,Zhongqiang Shan
In this paper, Pt-Ru/Ni-P/FTO has been designed and fabricated as the counter electrode for dye-sensitized solar cells. The Pt-Ru catalytic layer and Ni-P alloy sublayer are prepared by traditional electrodeposition method and a simple electroless plating method, respectively, and the preparation conditions have been optimized. The scanning electron microscopy (SEM) images show that the Pt-Ru particles are evenly distributed on FTO and Ni-P/FTO substrate. By X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS), it is confirmed that the Ni-P amorphous alloy has been formed, and no other compounds involved Ni and P have been formed. The electrochemical measurement results reveal that the Pt-Ru electrode has higher catalytic activity and stability towards tri-iodine reduction reaction than Pt electrode in the organic medium. The Ni-P sublayer deposited on FTO glasses increases the conductivity and light-reflection ability of the counter electrode, and this contributes to lowering the inner resistance of the cell and improving the light utilization efficiency. Through the photovoltaic test, it is confirmed that the energy conversion efficiency of a single DSSC with the optimized Pt-Ru/Ni-P/FTO counter electrode is increased by 29% compared with that of the cell based on the Pt/FTO counter electrode under the same conditions.
✓ 已验证
产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2017
·Vol. 19
·期 34
·4964-4971
·
IF 3.474
Qi Zhao,Qin Wang,Yiguo Su,Keke Huang,Guangran Xu,Yingjun Li,Jiayin Liu,Baocang Liu,Jun Zhang
Driven by the need of high catalytic performance and low cost Pt-based catalysts for methanol oxidation (MOR) and oxygen reduction (ORR) reactions, we developed a highly active nitrogen species-decorated Pt–Ni–N catalyst with tunable architectures and facets toward high catalytic activity. The synthetic procedure was conducted by Ni2+-assisted morphology and facet transformation from nanoflowers (NFs) (111) to nanoparticles (NPs) (220) and simultaneous optimization of both hierarchical structure and active surface sites. It is found that the adsorption of nitrogen species plays critical roles in determining both facet control of the Pt–Ni–N hierarchical structure and energetic activation of the catalytic reaction. Decoration of surface nitrogen species can effectually improve the relative content and electronic density of Pt0, leading to formation of a hierarchical structure and significantly improved catalytic activity toward both MOR and ORR compared with Pt–Ni and Pt–N, as well as the commercial Pt/C catalysts, indicating a new strategy to obtain highly efficient catalysts. Moreover, the results demonstrate that the catalytic enhancement is mainly due to the synergistic electronic effects among Pt, Ni, and N species.
✓ 已验证
产品关联
DOI
高影响因子
Catalysts
·
2017
·Vol. 7
·期 4
·125
·
IF 3.082
Liqiong Wang,Liang Huang,Chengpeng Jiao,Zili Huang,Feng Liang,Simin Liu,Yuhua Wang,Haijun Zhang
ISOBAM-104 protected Rh/Ni bimetallic nanoparticles (BNPs) of 3.1 nm in diameter were synthesized by a co-reduction method with a rapid injection of KBH4solution. The catalytic activities of as-prepared BNPs for hydrogen generation from hydrolysis of a basic KBH4solution were evaluated. Ultraviolet-visible spectrophotometry (UV-Vis), transmission electron microscopy (TEM), and high-resolution transmission electron microscopy (HRTEM) were employed to characterize the structure, particle size, and chemical composition of the resultant BNPs. Catalytic activities for hydrolysis of KBH4and catalytic kinetics of prepared BNPs were also investigated. It was shown that Rh/Ni BNPs displayed much higher catalytic activities than that of Rh or Ni monometallic nanoparticles (MNPs), and the prepared Rh10Ni90BNPs possessed the highest catalytic activities, with a value of 11,580 mol-H2·h−1·mol-Rh−1. The high catalytic activities of Rh/Ni BNPs could be attributed to the electron transfer effect between Rh and Ni atoms, which was confirmed by a density functional theory (DFT) calculation. The apparent activation energy for hydrogen generation of the prepared Rh10Ni90BNPs was about 47.2 ± 2.1 kJ/mol, according to a kinetic study.Keywords:Rh/Ni BNPs;hydrogen generation;catalytic activities;electron transfer effect
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2016
·
IF 2.567
Jing Chen,Bo Zhang,Guangw Miao,Jun Men
SiO2–NiO aerogels with different molar ratios of Si/Ni (n(Si/Ni)) were prepared by a sol–gel method and atmospheric pressure drying technology. The morphology and structure of SiO2–NiO aerogels were characterized by XRD, BET, XRF, and SEM methods. The equilibrium adsorption performance of thiophene or benzothiophene on the SiO2–NiO aerogels were studied at three different adsorption temperatures (298, 313, 333 K). The adsorption equilibrium data of thiophene on SiO2–NiO aerogels were more in line with the Temkin model at the lower temperature, while they were well fitted with both Langmuir and Temkin isotherms at the higher temperature. The maximum saturation adsorption capacities obtained by the Langmuir isotherms at different temperature decreased in the order qm(298 K) > qm(313 K) ≈ qm(333 K). The maximum saturation adsorption capacities of thiophene or benzothiophene on SiO2–NiO aerogels with different n(Si/Ni) values at 298 K decreased in the order SiO2–NiO-23 > SiO2–NiO-74 > SiO2–NiO-6. The maximum saturation adsorption capacities of thiophene and benzothiophene on SiO2–NiO-23 aerogels are 6.4564 and 2.1316 mgS/g, respectively. Both the amount of adsorption active sites and the textural structure of aerogels could significantly affect the adsorption performance. The higher the nickel content, specific surface area, pore volume, and larger pore size of the aerogel, the larger the adsorption capacity. The absolute value of adsorption heat of thiophene on SiO2–NiO aerogels increased gradually with the increase of n(Si/Ni) (the reduction of the Ni content).
✓ 已验证
产品关联
DOI
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2017
·
IF 2.589
Lianbo Wang,Ming Chen,Huabing Liu,Chuanhai Jiang,Vincent Ji,Florent Moreira
In present work, the ternary Ni-Ti-CeO 2 composite coatings were electrodeposited on Al matrix composite (CNT/7075) in traditional Watts' solution containing various concentrations of CeO 2 nanoparticles and constant concentration of Ti microparticles . The effects of CeO 2 nanoparticles on microstructure and corrosion resistance of the obtained composite coatings were comprehensively investigated. The incorporation of moderate CeO 2 nanoparticles (less than 10 g L − 1 in Watts' solution) gave rise to grain refinement, random-orientation growth of nickel deposit and smooth surface of the composite coating. Corrosion tests of the Ni-Ti-CeO 2 composite coatings in 3.5 wt% sodium chloride (NaCl) at 25 °C illustrated the optimised microstructure favoured the enhancement of corrosion resistance. Further analyses of the corrosion behavior demonstrated that the embedded CeO 2 nanoparticles facilitated the formation of a compact passive film on the surface of the composite coatings during corrosion and promoted the formation of TiO 2 on the surface of Ti microparticles. The formation of TiO 2 not only protected the Ti metal particles but also helped to improve the corrosion resistance of the composite coatings, because the TiO 2 coated Ti microparticles decreased the attack probability of nickel deposits by corrosive medium. Typically, the Ni-Ti-CeO 2 composite coating electrodeposited in Watts' solution containing 10 g L − 1 CeO 2 nanoparticles possessed the best corrosion resistance and excessive CeO 2 nanoparticles deteriorated the corrosion resistance.
✓ 已验证
产品关联
DOI
高影响因子
GREEN CHEMISTRY
·
2016
·Vol. 18
·期 13
·3858-3866
·
IF 8.506
Meng-Yuan Chen,Chu-Bai Chen,Bakht Zada,Yao Fu
The hydrogenolysis of C–O and CO in 5-hydroxymethylfurfural for the production of furan biofuel 2,5-dimethylfuran (DMF) is of great importance for biomass refining. However, development of non-noble metal-based catalysts which perform stably for this process is still challenging. Here, perovskite-supported Ni catalysts were used for the hydrogenolysis of 5-hydroxymethylfurfural at 230 °C, with 98.3% yield of DMF being obtained. The effects of reaction conditions such as temperature and pressure were investigated and discussed, and the catalyst could maintain good activity after being used at least 5 times. In order to further explore the reaction mechanism, dynamic experiments at different times were carried out and a possible reaction pathway was proposed. The development of efficient perovskite-supported Ni catalysts verified their great potential in biomass conversion.
✓ 已验证
产品关联
DOI
高影响因子
NANO
·
2016
·
IF 0.951
Jingge Liu,Ang Cao,Jing Si,Lihong Zhang,Qinglan Hao,Yuan Liu
Sintering of the active metallic nanoparticles and carbon deposition are the key problems faced for CO methanation catalysts. For overcoming those problems, bimetallic nanocatalyst is a promising route. In this work, a series of Al 2 O 3 supported Ni-Co alloy catalysts were prepared by reducing NiCoAl layered double hydrotalcite (LDHs), and characterized with X-ray diffraction (XRD), temperature programmed reduction TPR, N 2 adsorption-desorption, transmission electron microscopy (TEM) and temperature programed oxidation (TPO) techniques. The resultant catalysts were mesoporous with nanoparticles of Ni-Co alloy ranging from 7.9 nm to 9.2 nm which were highly dispersed in alumina matrix. The sample Ni 7 Co 3 -Al 2 O 3 catalysts showed very good catalytic performance during the stability test at 500/600 ∘ C for 300 h, meanwhile exhibited excellent anti-sintering ability and anti-carbon deposition ability, owing to the formation of Ni-Co alloy and the feature of LDHs. This strategy for improving anti-sintering and anti-carbon deposition should be extendable for catalysts of other reactions.
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2016
·
IF 4.803
Zijiong Li,Weiyang Zhang,Chunyan Sun,Zhifu Feng,Baocheng Yang
It has shown better electrochemical performance to use two dimensions (2D) nanomaterial nickel hydroxide nanosheets as electrode materials in energy storage research. However, when compared with carbon electrode material, the disadvantage of metal hydroxide is more obvious. In this study, we use Ni(OH) 2 /rGO composites (NGCs) synthesized by hydrothermal method as electrode materials to conduct an electrochemical property tests in 6 M KOH electrolyte solution . As a result, when current density of NGC 8 samples (the mass ratio of Ni(OH) 2 and graphene is 8:1) is 0.8 A g −1 , the largest specific capacitance of composites is 1862.2 F g −1 . What’s more, when the current density is 15 A g −1 , the capacitance only reduced to 91.6% after the constant current charge and discharge for 2000 cycles, which showed magnificent cycling stability. Further investigations, the 2D nanomaterial NGCs can be easily transmitted to NrCs (NiO/rGO composites), and delivers a specific capacitance of 782.5 F g −1 at a current density of 0.5 A g −1 . These works are of great significance for the research of energy storage materials and the development of energy storage device.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2016
·Vol. 4
·期 27
·10609-10617
·
IF 8.262
Dewei Liang,Shouliang Wu,Jun Liu,Zhenfei Tian,Changhao Liang
Morphology control and impurity doping are two widely applied strategies to improve the electrochemical performance of nanomaterials. Herein, we report an environmentally friendly approach to obtain Co-doped Ni(OH)2 nanosheet networks using a laser-induced cobalt colloid as a doping precursor followed by an aging treatment in a hybrid medium of nickel ions. The shape and specific surface area of the doped Ni(OH)2 can be successfully adjusted by changing the concentration of sodium thiosulfate. Furthermore, a Co-doped Ni(OH)2 nanosheet network was further converted into Co-doped NiO with its pristine morphology retained via facile thermal decomposition in air. The structure and electrochemical performance of the as-prepared samples are investigated with scanning and transmission electron microscopy, energy dispersive X-ray analysis, X-ray diffraction, Fourier transform infrared spectroscopy, the nitrogen adsorption–desorption isotherm technique, and electrochemical measurements. The Co-doped Ni(OH)2 electrode shows an ultrahigh specific capacitance of 1421 F g−1 at a current density of 6 A g−1, and a good retention level of 76% after 1000 cycles, in sharp contrast with only a 47% retention level of the pure Ni(OH)2 electrode at the same current density. In addition, the Co-doped NiO electrode exhibits a capacitance of 720 F g−1 at 6 A g−1 and 92% retention after 1000 cycles, which is also superior to the corresponding values of relevant pure NiO electrodes. The Co2+ partially substitutes for Ni2+ in the metal hydroxide and oxide, resulting in an increase of free holes in the valence band, and, therefore, enhancement of the p-type conductivity of Ni(OH)2 and NiO. Moreover, such novel mesoporous nanosheet network structures are also able to enlarge the electrode–electrolyte contact area and shorten the path length for ion transport. The synergetic effect of these two results is responsible for the observed ultrahigh pseudocapacitor performance.
✓ 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）