Batteries-Basel
·
2023
·Vol. 9
·期 1
·46
·
IF 4
Yingping Bu,Yawen Zhang,Yingying Liu,Simin Li,Yanlin Zhou,Xuefen Lin,Zicong Dong,Renchun Zhang,Jingchao Zhang,Daojun Zhang
Effective and inexpensive electrocatalysts are significant to improve the performance of oxygen evolution reaction. Facing the bottleneck of slow kinetics of oxygen evolution reaction, it is highly desirable to design the electrocatalyst with high activity, good conductivity, and satisfactory stability. In this work, nickel foam supported hierarchical Co9S8–Ni3S2composite hollow microspheres were derived from in situ-generative MOF precursors and the subsequent sulfurization process by a simple two-step solvothermal method. The composite microspheres were directly grown on nickel foam without any binder, and nickel foam was used as the nickel source and support material. The morphology and constitution of the series self-supported electrodes were characterized by SEM, TEM, XRD, XPS, and Raman, respectively. The unique porous architecture enriched the electrode with sufficient active surface and helped to reactants and bubble evolved during electrochemical water oxidation. Through tuning the concentration of cobalt source and ligand, the content ratio of Co9S8and Ni3S2can be modulated. The heterostructures not only afford active interfaces between the phases but also allow electronic transfer between Co9S8and Ni3S2. The optimized Co9S8-Ni3S2/NF-0.6 electrode with the highest electrochemical surface area and conductivity shows the best OER performance among the series electrodes in 1 M KOH solution. The overpotential of Co9S8-Ni3S2/NF-0.6 is only 233 mV when the current density is 10 mA cm−2, and corresponding Tafel slope is 116.75 mV dec−1. In addition, the current density of Co9S8-Ni3S2/NF-0.6 electrocatalyst hardly decreased during the 12 h stability measurement. Our approach in this work may provide the future rational design and synthesis of satisfactory OER electrocatalysts.
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Gang Li,Ruiyang Tan,Xiangcheng Lu,Xinyu Zhang,Chengcheng Zhang,Bohong Gao,Yuting Zhou,Ke Chen,Ping Chen,Xinyi Wang
Chemical composition and morphological optimization are both effective strategies for constructing excellent electromagnetic wave absorption (EMWA) materials. While efficient EMWA materials derived from both metal-organic frameworks (MOFs) and MXenes have been extensively studied, composites derived from the Hofmann framework with MXene have not been reported. In this study, we employed a Hofmann framework ([Fe(pz)Ni(CN) 4 ], pz = pyrazine) and MXene (Ti 3 C 2 T x ) to create new MXene@Hofmann (MH1 and MH2) composites, using a simple co-precipitation method with two different contents of [Fe(pz)Ni(CN) 4 ]. The FeNi/C/TiO 2 composites with a multi-layered structure inherited from MXene were prepared by annealing the MXene@Hofmann composites at 500, 600, and 700 °C, resulting in the formation of MH1-500/600/700 and MH2-500/600/700 composites. Their compositions, morphologies, electromagnetic parameters, and EMWA performances were characterized. For the composites with a high [Fe(pz)Ni(CN) 4 ] content, MH2-600 has a minimum reflection loss ( RL min ) value of −30.63 dB at a thickness of only 1.8 mm and the broadest effective absorption bandwidth (EAB) of 3.90 GHz at 2.0 mm, while MH2-700 exhibits superior EMWA performance with an RL min value of −34.34 dB at 1.9 mm and an EAB value of 4.96 GHz at 2.1 mm. Their impressive EMWA performance might be attributed to the synergistic dielectric loss and magnetic loss and also the impedance matching from the reasonable ratio of the magnetic and dielectric components. This work demonstrates an effective strategy for constructing EMWA materials from the Hofmann framework and MXene.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Research and Technology-JMR&T
·
2023
·
IF 6.4
Yang Yu,Baojing Zhang,Xiaoping Cai,Zhejian Cao,Farid Akhtar,Xinyang Jiao,Xueding Chai,Peizhong Feng
Ni–Al–Cr alloys in the β phase (B2–NiAl) region exhibit remarkable stability and mechanical property. Through thermal explosion (TE) reaction, Ni–Al–Cr intermetallic compounds with high porosity can be obtained. In this study, the focus lies on analyzing the macroscopic morphology, microstructure, phase distribution, TE behaviour, and the mechanical property of porous Ni–Al–Cr in the β phase region. Following the TE reaction, the Al-rich sintered product demonstrates a uniform phase composition and high porosity, reaching 44.39%. The vigorous TE reaction promotes the formation of interconnected pores, while the high porosity structure compromises the mechanical properties of the sample. Conversely, the Al-poor sintered product, due to a moderate TE reaction and low porosity structure, maintains its complete morphology and exhibits excellent compression resistance (yield stress reaching 538 MPa). This study offers valuable insights for the fabrication of porous Ni–Al–Cr materials with exceptional structure and performance.
✓ 已验证
产品关联
DOI
高影响因子
iScience
·
2023
·
IF 5.8
Yuan Fan,Yuanao Zhang,Jiajun Wu,Song Zhao,Jiabin Guo,Zhimin Wang,Ming Chen,Qichong Zhang,Qingwen Li
Summary Free-standing metal-organic frameworks (MOFs) with controllable structure and good stability are emerging as promising materials for applications in flexible pressure sensors and energy-storage devices. However, the inherent low electrical conductivity of MOF-based materials requires complex preparation processes that involve high-temperature carbonization. This work presents a simple method to grow conductive nickel MOF nanowire arrays on carbon cloth (Ni-CAT@CC) and use Ni-CAT@CC as the functional electrodes for flexible piezoresistive sensor. The resulting sensor is able to monitor human activity, including elbow bending, knee bending, and wrist bending. Besides, the soft-packaged aqueous Ni-Zn battery is assembled with Ni-CAT@CC, a piece of glass microfiber filters, and Zn foil acting as cathode, separator, and anode, respectively. The Ni-Zn battery can be used as a power source for finger pressure monitoring. This work demonstrates free-standing MOF-based nanowires as bifunctional fabric electrodes for wearable electronics.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ADVANCED ENGINEERING MATERIALS
·
2023
·Vol. 25
·期 19
·2300474
·
IF 3.6
Qiu Hong,Siyuan Wang,Shaohui Yin
This study fabricates certain Ni/diamond composite coatings using a coelectrodeposition method and then evaluates the effect of diamond content on the morphology, phase structure, microhardness, wear, and corrosion resistance of such coatings, while exploring their tribological and anticorrosion mechanisms. It is demonstrated that the addition of diamond can change the preferred orientation of Ni from (200) to (111), and its texture coefficient value can be boosted from 23.3% to 64.4% with the increase of diamond content. In the experiment, at a diamond content of 3 g L −1 , the deposited diamond particles are more and evenly dispersed across the composite, with the microhardness of nickel-based coatings reaching an optimum value of 613 HV. In addition, the coefficient of friction is reduced to a minimum value of 0.627, while the wear rate is kept at only 1.79 × 10 −5 mm 3 Nm −1 , indicating a high wear resistance. Electrochemical test results demonstrate that the Ni/diamond composite coatings produced at 3 g L −1 create the maximum charge transfer resistance (5429.3 Ω cm 2 ) and the minimum corrosion current density (2.19 μA cm −2 ), features that can deliver the best corrosion resistance.
✓ 已验证
产品关联
DOI
高影响因子
ChemCatChem
·
2023
·Vol. 15
·期 15
·e202300300
·
IF 4.5
Yanxin Bai,Hui Xiong,Zhao Jiang,Riguang Zhang,Tao Fang.
Graphical The TNNs-modified Ni/C catalysts (TM=V, Mo, Nb, Ta) exhibited higher activity, kinetics, charge transfer and stability for alkaline MOR. Ni/VN−C showed the highest catalytic activity, nearly three times higher than that of Ni/C due to the highest coverage of the surface component NiOOH. A volcano plot existed between the d-band center and activity of the corresponding catalysts. Transition metal nitrides are considered as the promising materials in the energy conversion processes due to the similar electronic structures to Pt. In this work, a series of Ni/TMN−C (TM=V, Mo, Nb, Ta) catalysts were synthesized and investigated the catalytic performance for methanol oxidation reaction in alkaline media. The electrochemical measurements indicated that the TNNs-modified Ni/C catalysts exhibited higher activity, kinetics, charge transfer and stability for alkaline MOR compared with Ni/C. It was found that the incorporation of TMNs improved the activity and stability for MOR in various degree. Specially, Ni/VN−C showed the highest catalytic activity, nearly three times higher than that of Ni/C due to the highest coverage of the surface component NiOOH, consistent with the Tafel and EIS results that it exhibited the fastest charge transfer kinetics and reaction rate. XPS characterization indicated that the obvious electron interaction occurred between the TMNs and Ni species and Ni would transfer electrons to the transition metal nitrides, resulting in the electron-rich states of TMNs. Interestingly, combining the d-band center and activity of the corresponding catalysts, it could be found that a volcano plot existed between them, suggesting that the introduction of appropriate nitrides would change the electronic structure of Ni and enhance the catalytic performance for MOR in alkaline media.
✓ 已验证
产品关联
DOI
高影响因子
ChemSusChem
·
2023
·Vol. 16
·期 21
·e202300754
·
IF 8.4
Jing Guo,Feng Li,Yuting Chu,Peng Zou,Chuang Li
Graphical The 10 % Ni@CeOx catalyst exhibits excellent catalytic efficiency in the reduction amination of levulinic acid to prepare 1,5-dimethyl-2-pyrrolidone. 1,5-dimethyl-2-pyrrolidone (MNMP), as a highly efficient green solvent, can be obtained from biomass-derived levulinic acid and its esters with 100 % conversion and 96.8 % yield over a 10 % Ni@CeOx catalyst at 140 °C, 2 MPa H 2 , 8 h, and with water as the solvent. Structure-property correlation investigations were performed with diverse characterization methods, including BET, XRD, XPS, TEM, HAADF-STEM, H 2 -TPR, NH 3 -TPD, CO 2 -TPD and FT-IR, and the results revealed that the excellent catalytic performance of the 10 % Ni@CeOx catalyst was mainly resulted from the strong interaction between Ni and CeOx, which formed more catalytic active sites and contributed to higher reductive amination efficiency. Besides, the 10 % Ni@CeOx catalyst had a chemisorption effect on LA. This was also the key to the excellent catalytic activity of the 10 % Ni@CeOx catalyst. The 10 % Ni@CeOx catalyst exhibited great stability throughout 6 reaction runs and excellent catalytic efficiency in the kilogram scale preparation of MNMP. This work provides a low-cost, efficient, and environmentally friendly heterogeneous catalytic system for the production of MNMP.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 30
·14289-14296
·
IF 3.3
Xin-Xin Chen,Yu-Ping Zhang,Hong-Li Du,Li Wan,Cheng-Gang Zuo,Ling-Bo Qu
Membrane separation is a very promising and economical method for gravitational oil/water separation and the collection of oil spills. Both superhydrophilicity/underwater superhydrophobicity (SHL&UWSOB) and superhydrophobicity/superlipophilicity (SHB&SOL) are suitable materials for the solution. In this work, an ingenious design strategy of “two birds with one stone” to modify Ni foams (NFs) was developed, in which SHL&UWSOB was initially fabricated by the in situ growth of a bimetallic Fe/Ni-MOF on an NF surface by solvothermal synthesis. Further modification based on the resultant SHL&UWSOB-NF led to the construction of a SHB&SOL surface by simple immersion of stearic acid. The micro/nano structure beneficial to underwater superoleophobicity was tailored by optimizing the solvothermal reaction time in the range of 10–24 h. The results showed that SHL&UWSOB-NF was obtained with a high oil contact angle (OCA) of 165.9° under water when the time of the solvothermal reaction was kept at about 18 h. Likewise, the further modified NF exhibited an obvious SHB&SOL property with a water contact angle (WCA) of 156.3° and a water rolling angle (SCA) of 9°. The light oil (n-hexane) floating on the water's surface and heavy oil of carbon tetrachloride (CCl4) at the bottom of the water, as well as the mini-separation of oil/water, demonstrated its facile and versatile application as a separation medium. The strategy may offer new approaches for the fabrication of superwetting/superantiwetting separation materials for oil/water separation and oil collection.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
·
2023
·Vol. 98
·期 10
·2577-2586
·
IF 3.4
Shili Yan,Jiamei Zhu,Hongmin Wang,Bingqian Liu,Qinling Bi
BACKGROUND Heavy oil has the characteristics of high viscosity and low American Petroleum Institute gravity, which makes it difficult to transport and produce. The key to efficiently utilizing heavy oil is reducing viscosity and improving quality. Hydroconversion has the advantages of viscosity reduction and decreased coke production, but it is difficult to separate nonmagnetic catalysts from the reaction system, which affects the industrial application. RESULTS A spherical Fe 3 O 4 (74.71 emu g −1 ) and a chain Fe Fe 2 O 3 (110 emu g −1 ) were prepared as magnetic cores, and coated with SiO 2 and Al 2 O 3 layers, respectively. The metal-supported catalyst modified with Co and Ni show irregular and honeycomb-shaped surfaces, and the magnetic saturation strength decreases to 24.91 and 14.63 emu g −1 , but still possessing superparamagnetic properties, enabling the catalysts to be separated from the reaction mixture. Fe-Fe 2 O 3 @SiO 2 @Al 2 O 3 @CoNi catalyst has the best viscosity reduction effect for Canadian oil sands asphalt residue at about 410 °C and 10 MPa hydrogen pressure. The viscosity of the liquid product decreased significantly from 56 600 to 135 mPa s at 50 °C, with a viscosity reduction of 99.8%. CONCLUSION Magnetic catalyst prepared from chain-like Fe-Fe 2 O 3 has an excellent honeycomb structure, which can provide increased active surfaces and exhibit improved viscosity reduction performance. This work provides a strategy for the recovery of heavy oil hydrogenation catalysts and is expected to play a key role in the practical application of heavy oil hydrogenation catalytic viscosity reduction. © 2023 Society of Chemical Industry.
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2023
·
IF 16.5
Shiyao Liu,Yutong Gong,Xiao Yang,Nannan Zhang,Huibin Liu,Changhai Liang,Xiao Chen
The study of the aqueous-phase selective hydrogenation of maleic anhydride to succinic acid is important for expanding the coal chemical industry chain and promoting biomass conversion . The key lies in the development of highly efficient and stable non-noble metal catalysts. Herein, we report a novel intermetallic CaNi 2 Si 2 catalyst with high activity and stability for the aqueous-phase selective hydrogenation of maleic anhydride. The results from the experiments and theoretical calculations demonstrated that the high catalytic performance was due to the synergy of the electron-rich Ni active sites, enhanced adsorption of C=C bonds, and favorable activation of H 2 . The yield of succinic acid can be 100% over the CaNi 2 Si 2 catalyst at the contact time of 5.4 g cat /(mmol reactant ·min −1 ) under 3 MPa and 120 °C in the continuous flow reactor. Furthermore, the special coordination environment and electronic structure of Ni in CaNi 2 Si 2 inhibit the formation of carboxylates, thus enhancing the acid resistance in the reaction environment. The fine design and regulation of the structure of intermetallic silicides will be important references for the controllable optimization of maleic anhydride hydrogenation catalysts and provide new insights into the development of efficient and stable selective hydrogenation catalysts in harsh reaction environments.
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Yuxiao Yang,Xiaolei Liu,Jianyun Zhao,Xin Jia,Zhiwei Li,Chunhui Xiao,Jiuhong Wang,Yinhuan Li,Jin Liang,Shujiang Ding,Wei Yu
Ti 3 C 2 T x can dissipate energy well due to its high conductivity, but at the expense of severe electromagnetic (EM) wave reflection, which is exacerbated by self-stacking. Despite various attempts to tackle this problem, the excessive isolation of Ti 3 C 2 T x and massive high-density inorganic components render these designs unfavorable for lightweight and broadband absorption. Meanwhile, improvements in absorption performance are related to active surface and polarization interface expansion, as well as conductive path reconstruction, but the main contributing factor remains unknown. In this work, the dual-shell structured Ti 3 C 2 T x @CNTs/Ni-HS (hollow sphere) composites are fabricated. This structure creates a confined dissipation cage, where the CNTs/Ni shell confines the electron transfer among spheres and prevents self-restacking and the tightly contacted Ti 3 C 2 T x shell forms an uninterrupted conductive path for effective dissipation. Therefore, Ti 3 C 2 T x @CNTs/Ni-HS-1 exhibits a broad effective absorption band of 6.1 GHz and a minimum reflection loss of −64.6 dB at a mass ratio of only 15 wt%. Importantly, when hollow structure cracks, although large active surface and polarizable interface remain, the absorption capacity of fragmented Ti 3 C 2 T x @CNTs/Ni-HS-1 deteriorates, indicating rational conductive path in confined dissipation cage is the main factor in achieving excellent performance. This work provides new insight for the rational design of high-performance absorbers.
✓ 已验证
产品关联
DOI
高影响因子
TALANTA
·
2023
·
IF 6.1
Xiaojun Wen,Huan Cheng,Weilong Zhang,Lijun You,Jumei Li
To enable the widespread application of surface-enhanced Raman scattering (SERS) technique in practical sensing of organic pollutants, it is essential to develop a reliable SERS substrate that offers both high sensitivity and reusability. In this study, we employed a simple and rapid in-situ deposition method to coat Ag nanoparticles onto flower-like Ni(OH) 2 spheres, resulting in the formation of Ni(OH) 2 /Ag composites with excellent photocatalytic performance and SERS activity. These composites were used as a promising SERS analysis tool for effective detection of organic pollutants, including ciprofloxacin hydrochloride (CIP) and methylene blue (MB). Notably, the composites exhibited outstanding detection limits of 10 −8 M for MB and 10 −7 M for CIP, respectively, and showed a strong linear relationship between SERS intensities and the logarithmic concentration (R 2 ≥ 0.97). Moreover, under simulated sunlight irradiation, the Ni(OH) 2 /Ag composites efficiently degraded MB and CIP molecules within a short period of 120 min for MB and 130 min for CIP. This demonstrated their practical reusability, as evidenced by their consistent performance over five cycles of SERS sensing. These findings underscore the significant potential of these composites for SERS-based detection of trace pollutants and ecological restoration through photocatalytic reactions in the future.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）