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.
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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.
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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.
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Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 28
·9527-9538
·
IF 6.4
Shuaizhen Li,Zhibo Zheng,Siwei Liu,Zhenguo Chi,Yi Zhang,Jiarui Xu
Graphite films are widely used in microelectronic devices as heat-dissipation materials due to their high thermal conductivity, low thermal expansion coefficient and lightweight. In the 5G era, the miniaturization and integration of microelectronic devices are continuously improving, so there are higher requirements for heat-dissipation materials. Therefore, flexible graphite films with high thermal conductivity are urgently needed. In this work, nickel-coated CNTs (Ni@CNTs) were prepared first as additives to be incorporated into the PI matrix via in situ polymerization, and then the Ni@CNTs/PI composite films were carbonized and graphitized at high temperature to form graphite films. In this composite system, nickel particles can effectively improve the graphitization degree of the obtained graphite films, which is beneficial to the improvement of their thermal conductivity, as well as the CNTs can effectively enhance the cross-plane thermal conductivity and mechanical strength of the graphite films. The graphite films obtained from the graphitization of PI/Ni@CNTs (0.4 wt%) have a perfect graphene structure and optimal properties. The optimal layer thickness of graphene is 0.3354 nm, while the d-spacing of the graphite layers is around 0.3358 nm. The in-plane thermal conductivity is 1.13 times greater than that of the graphite film made from the pure PI film (G0 film), which has a value of 1198.5 W m−1 K−1. The cross-plane thermal conductivity is 6.26 W m−1 K−1, which is 2.96 times that of the G0 film (2.11 W m−1 K−1). The bending strength is 72.3 Mpa, which is 2.28 times that of the G0 film (31.7 Mpa). The introduction of Ni@CNTs greatly improves the comprehensive properties of graphite films, and the preparation technology has an important guiding significance for the preparation of high thermal conductivity flexible graphite films and important industrial application value.
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Advanced Science
·
2023
·Vol. 10
·期 22
·2301869
·
IF 15.1
Zhiyong Jiang,Xiaodi Zhu,Zhiyu Wang,Wei Liu,Wensheng Yan,Kevin Sivula,Jun Bao
The structural properties of octahedral sites (B Oh ) in spinel oxides (AB 2 O 4 ) play vital roles in the electrochemical performance of oxygen-related reactions. However, the precise manipulation of AB 2 O 4 remains challenging due to the complexity of their crystal structure. Here, a simple and versatile molten-salt-mediated strategy is reported to introduce Ni 2+ in B oh sites intentionally on the surface of zinc ferrite (ZnFe 2 O 4 , ZFO) to promote the active sites for photoelectrochemical (PEC) water splitting. The as-created photoanode (ZFO-MSNi) shows a remarkable cathodic shift of ≈ 450 mV (turn-on voltage of ≈ 0.6 V RHE ) as well as three times the 1-sun photocurrent density at 1.23 V RHE for PEC water oxidation in comparison with bare ZFO. A comprehensive structural characterization clearly reveals the local structure of the introduced Ni 2+ in ZFO-MSNi. Fewer surface trapping states are observed while the precisely introduced Ni 2+ and associated neighboring Fe (3- σ )+ (0< σ <1) sites unite in an edge-sharing octahedral configuration to function as Ni Fe dual active sites for PEC water oxidation. Moreover, open circuit potential measurements and rapid-scan voltammetry investigation give further insight into the enhanced PEC performance. Overall, this work displays a versatile strategy to regulate the surface active sites of photoelectrodes for increasing performance in PEC solar energy conversion systems.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Jiayi Wu,Yuhang Zheng,Jiali Fu,Yafei Guo,Jun Yu,Jie Chu,Pu Huang,Chuanwen Zhao
Integrated CO 2 capture with reverse water gas shift (RWGS) reaction to produce syngas represents a promising technology to realize C1 recycling and utilization. Designing highly efficient Ni–CaO dual function materials (DFMs) is the key to achieve integrated CO 2 capture and utilization (ICCU). In this work, Ni–CaO–CeO 2 DFMs powders and pellets are prepared by the wet mixing, coprecipitation and sol–gel methods using acetate and nitrate precursors. Physicochemical properties and ICCU performance of the Ni–CaO–CeO 2 DFMs depend on synthetic mode, precursor, and granulation process. NiCaCe-SG (A) and NiCaCe-SG (N) prepared by sol–gel method show excellent ICCU-RWGS performance due to the developed pore structures, enhanced surface basicity, uniform Ni dispersion, minimized Ni grain size, abundant oxygen vacancies and reinforced reducibility. The NiCaCe-SG (A) sample prepared using acetate salts as precursors exhibits better ICCU-RWGS performance than the nitrate precursors-derived NiCaCe–SG (N) DFMs. Granulation adversely affects the CO 2 capture capacity, CO yield and working stability of the NiCaCe–SG (N) sample due to declined textural properties, weakened surface basicity and reducibility. NiCaCe–SG (A) represents an excellent DFMs candidate for ICCU-RWGS with high CO 2 uptake and conversion rate of 15.34 mmol CO 2 /g and 92.4 %, great CO yield and CO selectivity of 5.97 mmol CO/g and 89.1 %, and good working stability (a low decay rate of 11.6 % in 10 cycles). These results have provided new insights into the rational design of high-performance DFMs for ICCU applications.
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Catalysis Science & Technology
·
2023
·Vol. 13
·期 8
·2385-2392
·
IF 5
Huafan Li,Nan Zhou,Tianli Zhu,Hailian Tang,Guoyi Bai
The selection and pretreatment of supports generally have a significant effect on the catalytic performance of supported catalysts, since the dispersity and chemical state of the supported metal species can be remarkably altered by the support. Here, we reported a Ni-catalyst supported on H2O2 modified nanodiamonds (NDs) which showed much improved catalytic activity and stability for the phenol hydrogenation reaction than the other two catalysts with untreated NDs and high temperature N2 treated NDs as supports, respectively. It was found that the interaction between the ND support and nickel species was enhanced by simple H2O2 pretreatment while retaining the excellent structural stability of the ND. Under the effect of these factors, the nickel species are stabilized on the support surface with a small particle size even after high temperature treatment, accounting for the improved catalytic performance of the catalyst. This study highlights the importance of support selection and pretreatment, and provides new ideas for the design and development of supported catalysts.
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APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Yanmeng Cai,Wen Zhang,Jinsheng Zhao,Yue Wang
Prussian blue analogues (PBAs), as the representative of Faradaic materials, has drawn extensive attention in capacitive deionization (CDI) for unique redox activity, open framework structure, and low-cost synthesis. However, the serious aggregation, low conductivity, and easy structural collapse of PBAs nanoparticles limit the practical application in CDI. Herein, the ternary composite Ni,Co-PBA@MXene/PPy is flexibly constructed by integrating the collective advantages of Ni,Co-PBA, MXene, and PPy. In this configuration, MXene not only provides high conductivity but also acts as the good substrate for the in-situ homogeneous growth of Ni,Co-PBA nanoparticles. Furthermore, Ni,Co-PBA nanoparticles could effectively inhibit the self-stacking of MXene and facilitate fast ion intercalation. And the doping of Co in Ni,Co-PBA promotes the redox process by the pseudocapacitive contribution. Meanwhile, PPy contributes to accelerating ions transport rate and promoting the structural stability of MXene and Ni,Co-PBA. Consequently, the hybrid CDI cell AC//Ni,Co-PBA@MXene/PPy delivers prominent desalination performance with the high salt adsorption capacity (38.7 mg g −1 ), rapid salt adsorption rate (10 mg g −1 min −1 ), low energy consumption (0.283 kWh kg −1 -NaCl), and outstanding cyclic stability. Most importantly, the Ni,Co-PBA@MXene/PPy electrode can reserve favorable structural integrity by the significant shielding effect of PPy to prevent Ni,Co-PBA from collapse and MXene from being oxidized.
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Gels
·
2023
·Vol. 9
·期 3
·190
·
IF 4.6
Jiaxin Lu,Wenke Hao,Xiaodong Wu,Xiaodong Shen,Sheng Cui,Wenyan Shi
It remains a big challenge to develop non-precious metal catalysts for oxygen evolution reaction (OER) in energy storage and conversion systems. Herein, a facile and cost-effective strategy is employed to in situ prepare the Ni/Fe oxyhydroxide anchored on nitrogen-doped carbon aerogel (NiFeOx(OH)y@NCA) for OER electrocatalysis. The as-prepared electrocatalyst displays a typical aerogel porous structure composed of interconnected nanoparticles with a large BET specific surface area of 231.16 m2·g−1. In addition, the resulting NiFeOx(OH)y@NCA exhibits excellent OER performance with a low overpotential of 304 mV at 10 mA·cm−2, a small Tafel slope of 72 mV·dec−1, and excellent stability after 2000 CV cycles, which is superior to the commercial RuO2catalyst. The much enhanced OER performance is mainly derived from the abundant active sites, the high electrical conductivity of the Ni/Fe oxyhydroxide, and the efficient electronic transfer of the NCA structure. Density functional theory (DFT) calculations reveal that the introduction of the NCA regulates the surface electronic structure of Ni/Fe oxyhydroxide and increases the binding energy of intermediates as indicated by the d-band center theory. This work provides a new method for the construction of advanced aerogel-based materials for energy conversion and storage.Keywords:carbon aerogel;Ni/Fe oxyhydroxide;nitrogen doping;OER;DFT calculations
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高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Jie Mei,Guangya Hou,Huibin Zhang,Qiang Chen,Huazhen Cao,Yiping Tang,Jianli Zhang,Guoqu Zheng
In multifunctional catalysts, Ni-based alloys and compounds can be used for methanol oxidation reaction (MOR) and urea oxidation reaction (UOR). Herein, the porous dendritic NiCu@PPy/316L stainless steel mesh (SSM) electrode is prepared by dynamic hydrogen bubble template electrodeposition, followed by cyclic voltammetry electrodeposition of polypyrrole (PPy) conductive polymer on the electrode surface. Among them, dynamic hydrogen bubbles successfully assisted the formation of porous structures in the Ni-based deposition layer. In addition, the morphology of the resulting Ni-based layer further evolves from particle stacking to dendritic with high specific surface area with Cu doping. Eventually, 2-NiCu/SSM achieves current densities of 294.5 mA·cm −2 (MOR) and 278.6 mA·cm −2 (UOR) at 0.8 V, respectively. The PPy coating prevents the agglomeration of NiCu particles in the catalytic layer and further improves the persistence of the electrochemical performance. After 2000 cycles, the current densities of 2-NiCu @PPy/SSM in the new electrolyte are maintained at 89.1% (MOR) and 94.8% (UOR) of the original value, with a 10% increase for MOR and a 7% increase for UOR compared to the sample without PPy coating (2-NiCu /SSM).
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Micromachines
·
2023
·Vol. 14
·期 4
·870
·
IF 3.4
Huan Wang,Mingxuan Dong,Baorui Shao,Yaodan Chi,Chao Wang,Sa Lv,Ran Duan,Boqi Wu,Xiaotian Yang
N-TiO2/Ni(OH)2nanofiber was successfully prepared by combining the electrospinning and solvothermal method. It has been found that under visible light irradiation, the as-obtained nanofiber exhibits excellent activity for the photodegradation of rhodamine B, and the average degradation rate reaches 3.1%/min−1. Further insight investigations reveal that such a high activity was mainly due to the heterostructure-induced increase in the charge transfer rate and separation efficiency.
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ACS Omega
·
2023
·
IF 4.1
Yanghao Meng,Hongbiao Du,Shuai Lu,Yanwei Liu,Jinglai Zhang,Hualong Li
Hydrothermal liquefaction (HTL) is one of the most promising technologies for biofuel production. The preparation and application of catalysts for HTL have been the research focus in recent years. In this study, a new synergistic catalytic process strategy is proposed. CuO–CeO2/γ-Al2O3 was used as an in situ hydrogen donor catalyst and Ni–Co/SAPO-34 was synthesized for hydroprocessing to improve bio-oil production process. The results of XRD and XPS demonstrated that the metal components were well supported on the catalyst. When the two catalysts were mixed, the yield of bio-oil increased from 51.00% to 64.51%, the carbon recovery rate raised from 69.53% to 88.18%, the energy recovery rate grew from 63.42% to 80.22%, and the S content is relatively reduced by 83.3%. Also, TG analysis showed that the content of light components in bio-oil increased. Moreover, the hydrocarbons and alcohols were observed to a higher proportion from the GC-MS analysis. This new method still has high catalytic activity after repeated use for five times. This study provides a new idea for preparing higher yield and superior quality bio-oil.
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