ACS Applied Materials & Interfaces
·
2017
·
IF 7.504
Xin Ao,Zhaoyin Wen,Xiangwei Wu,Tian Wu,Meifen Wu
The role of the Ni3S2 layer on Ni particles in the electrochemical performance of Na/NiCl2 cells with the addition of sulfur into the cathode is studied. It was found that the Ni3S2 layer could be in situ generated on nickel particles and exhibit a self-repairing function during cycling when sulfur exists in the cathode due to the reaction between the sulfur and nickel particles. The self-repairing function of the Ni3S2 layer could enhance the blocking effect and improve the battery cycle performance. The capacity of the cell with the optimum amount of sulfur (with self-repairing function) after 50 cycles is about 12% greater than that of the cell with the optimum level of Ni3S2 (without self-repairing function). The effect of the self-repairing function of the Ni3S2 layer is determined by the amount of sulfur in the cathode.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
International Journal of Minerals Metallurgy and Materials
·
2018
·Vol. 25
·期 2
·226-235
·
IF 1.261
Chen Zhi-yuan,Bian Liu-zhen,Yu Zi-you,Wang Li-jun,Li Fu-shen,Chou Kuo-Chih
Carbon deposition on nickel powders in methane involves three stages in different reaction temperature ranges. Temperature programing oxidation test and Raman spectrum results indicated the formation of complex and ordered carbon structures at high deposition temperatures. The values of I (D)/ I (G) of the deposited carbon reached 1.86, 1.30, and 1.22 in the first, second, and third stages, respectively. The structure of carbon in the second stage was similar to that in the third stage. Carbon deposited in the first stage rarely contained homogeneous pyrolytic deposit layers. A kinetic model was developed to analyze the carbon deposition behavior in the first stage. The rate-determining step of the first stage is supposed to be interfacial reaction. Based on the investigation of carbon deposition kinetics on nickel powders from different resources, carbon deposition rate is suggested to have a linear relation with the square of specific surface area of nickel particles.
研究领域:
化学工程
·
材料科学
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Hao Deng,Ziqi Chen,Yuanzhi Chen,Jie Mei,Wanjie Xu,Laisen Wang,Dong-Liang Peng
Solvothermal synthesis offers an important approach to prepare nickel particles with high crystallinity and low agglomeration. In this study, submicron nickel particles are prepared by a solvothermal approach involving alcohol reduction with the assistance of different types of organic bases. The influences of the types of organic bases and solvents, and the amount of organic bases on the particle size and morphology of nickel are studied. It is found that an organic base with a stronger alkalinity is able to generate nickel particles with smaller size. Smaller nickel particles are also prone to be obtained from solvents with a stronger reducing ability. Moreover, the formation mechanism of nickel particles is investigated. It is found that the nickel precursor and OH − form nickel layered hydroxide salts at the initial stage, and then the nickel layered hydroxide salts gradually dissolve to form nickel particles. Magnetic measurement reveals the morphology-dependent magnetic properties . Although the sample which has the smallest size exhibits a relatively high coercivity , samples which have a rather large particle size but consist of smaller primary nanoparticles also show relatively high coercivity values.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Yiling Wu,Kaiji Xu,Jian Tian,Longmei Shang,Kok Bing Tan,Hao Sun,Kang Sun,Xiaoping Rao,Guowu Zhan
The efficient and economic conversion of CO2 and renewable H2 into methanol has received intensive attention due to growing concern for anthropogenic CO2 emissions, particularly from fossil fuel combustion. Herein, we have developed a novel method for preparing Ni/In2O3 nanocatalysts by using porous MIL-68(In) and nickel(II) acetylacetonate (Ni(acac)2) as the dual precursors of In2O3 and Ni components, respectively. Combined with in-depth characterization analysis, it was revealed that the utilization of MIL-68(In) as precursors favored the good distribution of Ni nanoparticles (∼6.2 nm) on the porous In2O3 support and inhibited the metal sintering at high temperatures. The varied catalyst fabrication parameters were explored, indicating that the designed Ni/In2O3 catalyst (Ni content of 5 wt %) exhibited better catalytic performance than the compared catalyst prepared using In(OH)3 as a precursor of In2O3. The obtained Ni/In2O3 catalyst also showed excellent durability in long-term tests (120 h). However, a high Ni loading (31 wt %) would result in the formation of the Ni-In alloy phase during the CO2 hydrogenation which favored CO formation with selectivity as high as 69%. This phenomenon is more obvious if Ni and In2O3 had a strong interaction, depending on the catalyst fabrication methods. In addition, with the aid of in situ diffuse reflectance infrared Fourier transform spectroscopy and density functional theory (DFT) calculations, the Ni/In2O3 catalyst predominantly follows the formate pathway in the CO2 hydrogenation to methanol, with HCOO* and *H3CO as the major intermediates, while the small size of Ni particles is beneficial to the formation of formate species based on DFT calculation. This study suggests that the Ni/In2O3 nanocatalyst fabricated using metal–organic frameworks as precursors can effectively promote CO2 thermal hydrogenation to methanol.
研究领域:
催化化学
·
材料科学
·
环境科学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF POWER SOURCES
·
2016
·
IF 6.333
Xin Ao,Zhaoyin Wen,Yingying Hu,Tian Wu,Xiangwei Wu,Qiming He
Nickel particles with different contents of Ni 3 S 2 surface layer were prepared for their application as cathode materials in Na/NiCl 2 batteries . The surface modification of nickel particles is found to prevent their growth and battery degradation during cycling. The optimum level of surface modification was determined by electrochemical tests and morphology characterization. Excessive Ni 3 S 2 layer seems to cause particle aggregation resulting in low reversible capacity. The capacity of the cell with optimum level of Ni 3 S 2 surface modification layer after 50 cycles is about 4 times greater than that without Ni 3 S 2 surface modification layer.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2021
·
IF 6.901
Zhihui Li,Aiping Wu,Ying Xie,Ying Gu,Haijing Yan,Dongxu Wang,Siyu Wang,Chengxu Jin,Lei Wang,Chungui Tian
The design of the electrocatalysts with the plentiful heterojuctional interface and large-accessible surface is desired to boost the HER performance, but it remains a challenge. Herein, we showed the design of 2D Ni/Ni 0.2 Mo 0.8 N porous heterojunction nanobelts as effective catalyst for the HER. The intimate combination of Ni and Ni 0.2 Mo 0.8 N can make the formation of the heterojuctional interface with plentiful active sites. The 2D porous structure can provide large accessible surface with less resistance for the transmission of the electrolytes, thus promoting the mass/charge transfer. The ratio of Ni and Ni 0.2 Mo 0.8 N can be easily tuned by regulating the precursor composition, which is important to give catalysts with optimized interface and suitable pores. Density functional theory calculations reveal that the interaction between Ni and Ni 0.2 Mo 0.8 N at the heterointerface can largely improve the intermediate H* adsorption kinetics (ΔG H* = -0.07 eV). Due to the above advantages, the optimized catalysts exhibited excellent HER activity with a low overpotential of 48 mV in 1 M KOH at 10 mA cm −2 (without iR correction), which is superior to the most reported non-noble metal-based catalysts, and the long-term durability with no obvious degradation after continual operation of 48 h Notably, an electrolyzer assembled by the optimized Ni/Ni 0.2 Mo 0.8 N cathode with NiFe-LDH anode only requires a low operating voltage of 1.47 V to deliver 10 mA cm −2 in 1 M KOH, surpassing the corresponding Pt/NF||RuO 2 /NF electrolyzer (1.61 V) and most of reported electrolyzers.
研究领域:
材料科学
·
电催化
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Teng Zhang,Hongbin Shi,Yabing Zhang,Qing Liu,Weiyang Fei,Tao Wang
Hollow flower-like nickel particles were prepared by a facile polyol method, and applied to solid propellant as combustion promoter. Ni[C 2 H 4 (NH 2 ) 2 ] 3 (COOH) 2 complex was used to fabricate hollow flower-like intermediate in ethylene glycol (EG), and then the intermediate was calcined and auto-reduced in nitrogen to obtain the hollow flower-like nickel particles. The hollow particles' shell thickness is about 120 nm, and the petals' thickness of the flower structure is about 10 nm. Importantly, the hollow spheres' diameter can be accurately controlled from 200 nm to 2 μm by adjusting the concentration of complex Ni[C 2 H 4 (NH 2 ) 2 ] 3 (COOH) 2 in the reaction solution. The growth of the hollow flower-like particles was illustrated as an extraordinary growth-shrink-collapse process by analyzing the intermediate's morphologies as reaction going on. By adding a certain amount (typically 5 wt%) of the prepared nickel powders, the exothermic decomposition of ammonium perchlorate, which is the main component of solid propellant, was well promoted. The decomposition temperature was decreased by about 140 °C, and the exothermic peak at higher temperature shifted to the lower temperature range, heat released of AP's decomposition also increased by about 150%.
研究领域:
材料科学
·
燃烧与推进
✓ 已验证
产品关联
DOI
高影响因子
Energy Advances
·
2024
·Vol. 3
·期 5
·1111-1120
·
IF 3.2
Pengwei Liu,Shouyan Sun,Tongfei Wang,Xiaojuan Shen,Maiyong Zhu
Considering its integration with other electronics, three-dimensional (3D) silicon with a large surface area is an attractive electrode substrate for supercapacitors (SCs). However, the poor silicon surface stability as well as the corresponding complicated and expensive protective fabrication process impede the practical applications of silicon-based SCs. In this work, a novel electrode was developed with a simple and facile solution method, where electrodeposited Ni particles served as the current collector layer (CC-layer) and the composite of poly(3,4-ethylenedioxythiophene) (PEDOT) and manganese dioxide (MnOx) prepared via the one-step co-electrodeposition method worked as active materials. The compact layer generated from Ni particles and PM was tightly wrapped around SiNWs, protecting the silicon surface from oxidation/corrosion. The deposition time of the Ni particles and PM was investigated. To further improve the electrochemical performance of the electrode, Pt nanoparticles (NPs) were introduced into the PM layer. The NP introduction not only enhanced the conductivity of the electrode but also made the surface become more hydrophilic, favoring the ion/charge transport. Benefiting from the large surface areas of SiNWs, the high conductivity of the CC-layer generated from the Ni particles, the high-capacity of PM and the hydrophilic surface resulting from Pt decoration, the synthesized NSi@PM–Pt electrode demonstrates a high areal specific capacitance of 207.43 mF cm−2 at 1 mA cm−2. The symmetric device delivers a maximum energy density of 0.006 mW cm−2 with a good stability retention up to 94.6% over 5000 cycles. The results afford a promising solution strategy to prepare high-performance silicon-based SCs with a simple, facile and cost-effective method.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Junwei Xu,Ya Chen,Lida Shen,Jiantao Zhao,Guibin Lou,Dazhi Huang,Youwen Yang
A method for fabricating superhydrophobic stainless-steel meshes based on magnetic field-assisted jet electrodeposition is proposed. Ferromagnetic nickel particles (Nip) were added to the electroplating solution to prepare Ni/Nip coatings with mountain-like rough structure on stainless-steel meshes, followed by application of a parallel magnetic field in the cathode region. Magnetic fields play an indispensable role in the preparation of coatings. Exposure to air for 6 days resulted in a spontaneous switch of the coating from superhydrophilicity to superhydrophobicity and exhibited superoleophilicity. X-ray photoelectron spectroscopy revealed that this transition in wettability was related to spontaneous adsorption of hydrocarbons in the air induced by the coating. Based on the superhydrophobicity and superoleophilicity of the as-prepared Ni/Nip-coated meshes, high-efficiency, high-throughput, and high-purity separation of oil-water mixtures was achieved with a 300-mesh mesh. Furthermore, the as-prepared meshes continue to exhibit a separation efficiency greater than 97.0% and stable reusability even after 50 repeated separations.
研究领域:
材料科学
·
表面工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2017
·
IF 3.133
Yuanfeng Wu,Xianghai Song,Fufeng Cai,Guomin Xiao
A series of Ce-NiO catalysts prepared by co-precipitation method were tested for glycerol transesterification with diethyl carbonate (DEC) to produce glycerol carbonate (GC). The microstructural and physicochemical properties of the catalysts were determined by XRD , XPS , SEM, EDX, CO 2 -TPD, N 2 -adsorption, FT-IR, and TG-DTG. The results showed that the particle size (100–350 nm) of the Ce-NiO was smaller than that of pure NiO (400–900 nm), suggesting addition of Ce in the catalyst synthesis could lessen the aggregation or facilitate the dispersion of NiO particles. The highest catalyst activity was observed over the Ce-NiO catalyst with Ce/Ni atomic ratio of 0.2 and calcined at 400 °C. 94.14% of glycerol conversion and 90.95% selectivity to GC were obtained over this catalyst under the optimum conditions (5 wt.% catalyst of glycerol, 85 °C, 8 h, glycerol/DEC ratio of 1:3). This catalyst can be reused up to three cycles with a slight decrease in its catalytic activity. It was found the well dispersed NiO particles and the strong basic sites derived from the substitution of Ce 4+ by Ni 2+ in the CeO 2 lattices synergistically promoted the glycerol conversion.
研究领域:
催化化学
·
材料科学
·
可再生能源
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2013
·
IF 3.548
Ying Wang,Jun Peng,Chen Zhou,Zi-Yian Lim,Chunzheng Wu,Shuang Ye,Wei Guo Wang
Ni/ x Pr-Al 2 O 3 ( x = 5, 10, 15, 20 wt%) catalysts with an application in autothermal reforming of methane were prepared by sequential impregnation synthesis; its catalytic performance was evaluated and compared with that of Ni/γ-Al 2 O 3 catalyst; the physicochemical properties of the catalysts were characterized by X-ray diffraction (XRD), Transmission electron microscope (TEM), X-Ray Photoelectron Spectrometer (XPS), Thermo Gravimetric Analyzer (TGA) and H 2 -temperature programmed reduction techniques (TPR). The results showed that Pr addition promoted the reduction of nickel particle size on the surface. TPR experiments suggested a heterogeneous distribution of nickel oxide particles over x Pr-Al 2 O 3 supports and the promotion of NiO reduction by Pr modification. The CH 4 conversion increased with elevating levels of Pr addition from 5% to 10%, then decreased with Pr content from 10% to 20%. For the stability catalytic tests, Ni/ x Pr-Al 2 O 3 catalysts maintained the high activity after 48 h while Ni/Al 2 O 3 had a significant deactivation.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Catalysis Science & Technology
·
2018
·Vol. 8
·期 19
·4877-4890
·
IF 5.365
Changzhen Wang,Yuan Qiu,Xiaoming Zhang,Yin Zhang,Nannan Sun,Yongxiang Zhao
Catalyst deactivation via severe carbon deposition and metal sintering is a significant obstacle to the industrialization of CO2 reforming of methane (CRM). Previous reports are mainly focused on metal oxide supported catalysts, which were proved to be less effective in eliminating the formation of carbon deposition completely. Here, we report a facile strategy for the preparation of a highly dispersed Ni@SiO2 nano-capsule catalyst, which features a monodisperse capsule and anchored Ni NPs in the inner porous shell. By virtue of this, carbon formation could be sterically hindered due to the sealed space for carbon formation and growth, and therefore excellent catalytic performance was achieved. Through comprehensive characterization and comparison of traditional supported catalysts as well as capsule catalysts with different architectures, the importance of a confined capsule structure in preventing carbon formation was convincingly demonstrated. Our work disclosed a morphological approach that is much more effective in preventing sintering of Ni NPs and suppressing carbon formation simultaneously, therefore shedding new light on the design and preparation of highly stable Ni-based catalysts for reforming reactions.
研究领域:
催化化学
·
材料科学
·
能源化学
✓ 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）