Energy Storage Materials
·
2023
·
IF 20.4
Qingyu Dong,Jianghua Wu,Yueqi Wang,Jizhen Qi,Jian Wang,Jing Li,Liyi Zhao,Shoulei Hu,Hui Shao,Yanbin Shen,Liwei Chen
Ni-rich layered oxides (LiNi x Co y Mn z O 2 , x ≥ 0.8, x + y + z = 1) are attractive cathode material candidates for building high-energy-density batteries owing to their higher specific capacity compared to their lower-Ni-content analogues. However, the high nickel content also brings challenges, such as storage instability in ambient conditions and poor cycle life. In this work, we propose a surface chemistry regulation strategy to simultaneously enhance the air storage stability and electrochemical stability of high-nickel cathode materials. A bifunctional ultrathin layer composed of trimethoxy(1H,1H,2H,2H-perfluorodecyl)silane (PFDTMS) was constructed on the surface of single-crystal LiNi 0.83 Co 0.12 Mn 0.05 O 2 (NMC811) particles via molecular self-assembly. The passivating PFDTMS layer forms a superhydrophobic surface on the modified NMC811 particles, effectively mitigating deactivation reactions of NMC811 in air, and ensuring an uncompromised electrochemical performance of NMC811-based electrode after storing in air for two weeks. Furthermore, the self-assembled PFDTMS layer contributes to the formation of an electrochemical stable cathode–electrolyte interphase (CEI) on the NMC811 surface, improving the cycling stability of NMC811 at high cut-off voltages. The PFDTMS-based CEI also alleviates the chemical corrosion of NMC811 by the electrolyte, slows down the dissolution of transition metal ions during long term cycling. These findings present a straightforward, effective, eco-friendly, and cost-efficient approach to tackle the stability challenges inherent to Ni-rich layered cathode materials.
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EUROPEAN POLYMER JOURNAL
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2023
·
IF 6
Kaizhen Wan,Yue Cai,Qihui Chen,Maochun Hong,Zhao-Xi Zhou,Heqing Fu
Widely employed as polymers, polyurethanes also struggle to strike a balance between mechanical and self-healing qualities. Extrinsic self-healing can readily result in the production of material defects and stress concentration, which can result in the loss of mechanical property. In this study, self-healing and mechanical properties were combined to create a self-healing polyurethane nanocomposite film (PUHN) with good fatigue resistance. Reversible hydrogen and disulfide bonds were introduced to the polyurethane film, meanwhile, carbon-coated nickel nanoparticles were dispersed into the matrix as fillers during the early stage of polymerization. The results showed that PUHN combines outstanding mechanical properties with excellent self-healing properties, while the tensile strength of PUHN was increased by 38 % to 2.32 MPa due to the small-size effect caused by the introduction of nanoparticles. The introduction of reversible disulfide bonding and the presence of abundant hydrogen bonding give PUHN excellent self-healing properties, which can reach 91.2 % self-healing efficiency after 3 h in an oven at 80℃. Meanwhile, the fatigue resistance of the composite material also shows considerable application potential for use in packaging.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2023
·
IF 22.1
Jiangyong Yuan,Chunqiang Lu,Zhenhua Gu,Jun Cai,Han Zhao,Danyang Li,Lei Jiang,Haiwen Xu,Zhi qiang Li,Kongzhai Li
Carbon cycling, instead of conventional oxygen cycling in chemical looping, overcomes the limitations of oxygen storage capacity of oxygen carriers and enables the reaction to proceed under relatively mild conditions. In this study, we designed a high-performance carbon-storage catalyst (Ni-Co/Al 2 O 3 ) for chemical looping conversion of CH 4 and CO 2 to H 2 and CO. The physico-chemical characterizations suggested that the Co alloyed with Ni could result in larger active metal particles and simultaneously benefit the bending of carbon deposits toward the periphery of the active sites, avoiding the quick deactivation of catalysts due to the encapsulation of the active sites by carbon deposits and generating a higher carbon capacity (23.59 vs. 14.08 mol/kg). In addition, the alloying of Co with Ni could weaken the graphitization of carbon deposits, thus facilitating the carbon elimination and catalyst regeneration in the CO 2 conversion step, strongly improving the cycling stability during long-term testing.
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CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Junhua Chen,Guo Feng,Feng Jiang,Li Yin,Qianqian Zhao,Shanfang Lan,XiaoJun Zhang,Jianmin Liu,Qing Hu,Weihui Jiang
Novel Ni-doped Al 2 TiO 5 emerald green ceramic pigments were successfully synthesized for the first time. Several characterization techniques (XRD, XPS , SEM, TEM, UV–Vis, and automatic colorimeters) were used to determine the phase composition and stability of the pigments, as well as the valence state of the doped nickel ion . The results show that nickel ion replaces the Al 3+ in the aluminum titanate lattice in the form of Ni 2+ , which reduces the distortion of the octahedral structure. Ni-doping of the aluminum titanate lattice produces an excellent coloring effect and significantly promotes the synthesis and stabilization of aluminum titanate. The novel pigments have excellent color stability while maintaining exceptional coloring performance and thermal stability in a base glaze synthesized at 1200 °C. These pigments show considerable potential for high-temperature applications.
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CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Qiuyu Cheng,Xin Chen,Lin Liu,Peng Jiang,Deshi Song,M.A. Subramanian
Novel green and blue chromophores based on Ni/Co/Cr doped BaMg 6 Ti 6 O 19 solid solutions are successfully synthesized through a solid-state reaction. The crystal structure of all the samples belongs to the magnetoplumbite structure with the space group of P 6 3 / mmc . The BaMg 6- x /2 Ti 6- x /2 Ni x O 19 (0 ≤ x ≤ 0.3) compounds exhibit a light green ( x = 0.1) to yellow-green ( x = 0.3) color. The oxidation state of Ni is confirmed to be +2 valence and the d-d transition of Ni 2+ in octahedral sites is responsible for color. BaMg 6- x /2 Ti 6- x /2 Co x O 19 (0 ≤ x ≤ 0.3) series show a blue color and the intensity of blueness is increasing with the increase of Co content. The blue color is due to d-d transitions within Co 2+ present in the tetrahedral sites. For BaMg 6- x /2 Ti 6- x /2 Cr x O 19 (0 ≤ x ≤ 2) phases the color varies from light green ( x = 0.2) to green ( x = 2). Chromium exists in +3 and + 6 oxidation states and the observed color is due to charge transfer transition between Cr 3+ –Ti 4+ and d-d transitions within octahedral Cr 3+ sites resulting in strong absorption in the visible region. The synthesized colored oxides are mixed with PMMA to prepare novel green and blue PMMA polymer composites to evaluate their compatibility in plastics.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2019
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IF 4.175
Run Yang,Jiaqing Yuan,Cuihong Yu,Kun Yan,Yao Fu,Hangqing Xie,Jian Chen,Paul K. Chu,Xinglong Wu
Multi-component composites consisting of SiC, Ni, NiO, and C nanoparticles (NPs) are fabricated by annealing SiC NPs and the Ni-based metal organic framework (Ni-MOF) in argon. The SiC/Ni/NiO/C nanocomposites exhibit efficient electromagnetic wave absorption (EWA) in comparison with the individual SiC NPs and Ni-MOF component. The minimal reflection loss (RL) is −50.52 dB at 13 GHz for a film thickness of 4.0 mm and the maximum bandwidth is 2.96 dB for RL < −10 dB and thickness of 2.5 mm. The outstanding absorption ability is attributed to the improved conductive paths rendered by the SiC NPs and multiple interfaces rendered by the SiC, Ni, NiO, and C NPs. As a result, interfacial polarization and multiple reflections are enhanced subsequently. This work reveals a new strategy to design and fabricate high-performance EWA materials by incorporating SiC NPs into magnetic materials.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2020
·
IF 4.939
Zhang Haocui,Xiao Zhourong,Yang Mei,Tian Yajie,Li Guozhu,Zhang Xiangwen,Liu Guozhu
As the only H 2 resource on aircraft from the steam reforming of the jet fuels on board, catalytic steam reforming of JP-10 (one of Jet fuels) over nickel-based catalyst Ni/SBA-15 were first carried out in a fixed bed tube reactor to produce hydrogen on-site or on board. A series of Ni/SBA-15 catalysts with different Ni content (3, 5, 8 and 10.8 wt%) were prepared by a modified incipient wetness impregnation method with addition of sucrose as ligand. And the effect of operation conditions of temperature (630–700 °C), nickel loading, liquid hour space velocity (LHSV = 5, 10, 15 ml/g cat ·h), steam to carbon molar ratio (S/C = 3, 5) on the catalytic activity and selectivity was investigated. It was found that 8Ni/SBA-15 was the optimal catalyst for steam reforming of JP-10 even with a higher LHSV and fuel gas concentration, and approximately 100% conversion of JP-10 with over 80% selectivity to hydrogen under the recommended experimental conditions of 680 °C, S/C of 5, LHSV of 10 ml/g cat ·h. The catalytic activity of 8Ni/SBA-15 dropped slowly to 84% after 6.5 h in the stability test and the carbon deposited was less with just 6% mass loss from TGA measurement (coke deposition rate 0.01g C /g cat h), which ascribed to possible reasons including confine effect of mesochannel of SBA-15, strengthened structure of mesochannels due to embeded Ni particles, and higher temperature to suppress the main carbon producing reaction.
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RARE METALS
·
2017
·Vol. 37
·期 2
·148-153
·
IF 1.189
Jin Hui,Wang Yi-Yong,Wang Yu-Ting,Yang Hong-Bing
Current machinery requires metallic materials to have better surface properties. Based on an orthogonal experimental design and analysis method, the CeO 2 -reinforced nickel nano-composite coatings were prepared by direct current electrodeposition in a nickel sulfate bath containing CeO 2 nanoparticles. Statistical results indicate that current density is the most significant variable in the electrodeposition processing, while temperature is the least important factor. The microstructure of Ni and Ni–CeO 2 nano-composite coatings was characterized by scanning electron microscopy (SEM) equipped with energy-dispersive spectroscopy (EDS), and X-ray diffraction (XRD). The microhardness of the Ni coating is enhanced by the incorporation of CeO 2 nanoparticles. Potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) were used to characterize the corrosion behavior of Ni and Ni–CeO 2 coatings. These studies show that Ni–CeO 2 coating has better corrosion resistance compared to Ni coating.
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CHEMICAL ENGINEERING JOURNAL
·
2016
·
IF 5.31
Sobia Aslam,Fazle Subhan,Zifeng Yan,Peng Peng,Ke Qiao,Wei Xing,Peng Bai,Rooh Ullah,U.J. Etim,Jingbin Zeng,Muhammad Ikram
In the present contribution, a single step H 2 -reduction strategy was developed for the first time to fabricate nickel-based KIT-6 (Ni-KIT-6) for adsorptive desulfurization of fuels . As-synthesized KIT-6 was used as a support and nickel nitrate, nickel chloride and nickel acetate as a nickel precursor was directly introduced into as-synthesized KIT-6. Ni 0 -based KIT-6 was obtained by single-step H 2 -reduction strategy which not only remove template and decompose nickel precursors to NiO but also reduce NiO to Ni 0 . This strategy is much more convenient and facile than reported strategies for Ni-based mesoporous silica KIT-6. Characterization results show that Ni-KIT-6 with nickel content up to 30 wt.% was highly dispersed due to silanols and confined space in as-synthesized KIT-6. The percentage content (54%) of Ni 0 in the as-synthesized KIT-6 is higher than Ni-based calcined KIT-6 (38%). Interestingly, Ni-based as-synthesized KIT-6 prepared using nickel nitrate as a precursor exhibited stronger nickel-KIT-6 interaction, higher Ni 0 content and dispersion than those prepared with nickel chloride and nickel acetate precursors. We also demonstrate here that the shielding effect of capping anions and hydration degree of different nickel precursors significantly affect the dispersion of nickel species even using as-prepared KIT-6 as a support. As a result, Ni-KIT-6(NO 3 − ) captured 0.195 and 0.12 mmol g −1 of sulfur from model fuel and FCC gasoline, respectively. Thus, single step H 2 -reduction strategy may have potential applications to be applied for fabrication of other nickel based mesoporous silicas for adsorptive desulfurization technology .
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MATERIALS & DESIGN
·
2016
·
IF 3.997
Yuhua Yan,Yanping Tian,Meifeng Hao,Yuqing Miao
The cross-like crystallines of Ni-Co-P microcomposites were synthesized via a simple hydrothermal method under high pressure and temperature which is adapted from the classical electroless deposition technique for surface modification. Here hypophosphite was employed as reductant and phosphorus resource to prepare the composites of Ni, Co and P elements. The obtain Ni-Co-P microcomposites were characterized in morphology, composition and properties. They show the perfect cross-like shape with an approximate stoichiometry of Ni 12 -Co 6 -P 12 -O 70 . The high absorbance in UV area and wide absorbance in vis area are observed. They also exhibit superparamagnetic behavior and hydrogen evolution property.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Junzheng Jiang,Yunfan Qiu,Hao Dong,Lei Yang,Yaping Miao,Liwei Xiong,Biao Gao,Xuming Zhang,Paul K. Chu,Xiang Peng
Molybdenum nitrides have garnered significant attention for their potential in the hydrogen evolution reaction (HER) due to their metallic behavior, abundant reserves, and pH-universal stability. However, their unsatisfactory hydrogen adsorption limits industrial applications. Heterostructures can be designed to introduce defects and modulate the electronic structure of catalysts to optimize hydrogen adsorption to enhance HER. Nevertheless, the exact active sites at the heterointerface and the fundamental mechanisms underlying the HER process remain inadequately understood. Herein, a composite electrocatalyst in which metallic Ni and MoN phases (Ni/MoN) form the heterointerface between them is fabricated. The heterointerface produces strong electronic interactions between Ni and MoN to facilitate electron transfer from MoN to Ni, and the built-in electric field facilitates charge transfer during electrocatalysis. This optimized electronic configuration with abundant active sites delivers excellent performance in alkaline HER. Density-functional theory calculations demonstrate that H 2 O dissociates at the Ni site, whereas H 2 desorption occurs at the Mo site. As a result, Ni/MoN/CC requires an overpotential of only 95 mV to achieve a current density of 10 mA cm −2 and a Tafel slope of 104 mV dec −1 . Moreover, it maintains a high current density of 100 mA cm −2 for 100 h with negligible morphological or compositional changes. The strategy of modulating the electronic structure of low-cost, transition metal-based heterostructured electrocatalysts is an effective and commercially viable means to design and develop high-performance electrocatalysts for water splitting.
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PubMed
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2024
·Vol. 171
·期 5
·053507
·
IF 3.1
Wenzheng Wu,Xiaojie Tang,Jing Wang,Chenghan Zhao
With the rapid development of electronics, additive manufacturing of complex three-dimensional microscale metal and alloy structures has emerged as one of the future directions for advanced technologies. In this study, a localized electrochemical deposition technique was developed which enables the fabrication of microscale three-dimensional metal structures in an ambient environment. Notably, we investigated the effects of voltage, initial electrode gap, and electrolyte composition on the deposition of Cu-Ni alloy. Furthermore, we successfully fabricated Cu-Ni equiatomic micro-columns, providing possibilities for the micro/nanoscale fabrication of commercial K-Monel copper. Finally, based on these foundations, we successfully shaped overhanging structures with various angles as well as an "H" structure using a rotating cathode substrate, demonstrating their potential in the fabrication of Cu-Ni alloy micro components.
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危险品化学品经营许可证（带存储）