Microstructures
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2026
·Vol. 6
·期 4
·N
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IF 8.5
Ding Zhou\u003Csup\u003E1,2\u003C\u002Fsup\u003E,Ruimin Shi\u003Csup\u003E3\u003C\u002Fsup\u003E,Chen Li\u003Csup\u003E2\u003C\u002Fsup\u003E,Anping Wang\u003Csup\u003E2\u003C\u002Fsup\u003E,Yu Gao\u003Csup\u003E2\u003C\u002Fsup\u003E,Qiang Wu\u003Csup\u003E4\u003C\u002Fsup\u003E,Qikui Man\u003Csup\u003E2\u003C\u002Fsup\u003E,Baogen Shen\u003Csup\u003E2\u003C\u002Fsup\u003E
The development of highly efficient microwave absorbers presents a significant challenge, driven by the growing issue of severe electromagnetic pollution. In this context, precise structural design emerges as a decisive factor for enhancing the microwave absorption capabilities. In this work, the hollow Ni0.5Zn0.5Fe2O4/C/Ni microspheres were fabricated through hydrothermal method, calcination treatment and further annealing. The results of the morphology observation demonstrate that the heterogeneous Ni0.5Zn0.5Fe2O4/C/Ni composites are hollow microspheres, consisting of many nanoparticles. Strikingly, the appearance of metallic Ni alongside increased carbon graphitization results from the partial reduction of Ni2+ by carbon during high-temperature annealing in the Ar atmosphere, which can be beneficial to the dielectric loss. The hollow Ni0.5Zn0.5Fe2O4/C/Ni microspheres possess outstanding microwave absorption capabilities, mainly owning to the better interface and dipole polarization, eddy current loss, conduction loss and natural resonance loss, multiply reflection and scattering between the microspheres. The hollow Ni0.5Zn0.5Fe2O4/C/Ni microspheres annealed at 700 °C exhibited an optimal reflection loss (RL) value of -35.79 dB at 2.5 mm and an effective absorption bandwidth (EAB) of 5.29 GHz at 2.0 mm. The present study reveals a design approach for heterostructures, which offers novel insights into the fabrication of high-performance microwave absorbing materials.
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INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
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2026
·Vol. 27
·期 7
·3193
·
IF 5.6
Da Zhang,Haiyu Qi,Bowen Lei,Xuan Guo,Feiyan Fu
Low-temperature methanation technology offers a promising pathway for carbon recycling and sustainable energy storage by enabling near-equilibrium CO 2 conversion under atmospheric pressure. However, efficiently activating CO 2 at low temperatures remains a significant challenge due to the kinetic limitations of hydrogenation intermediates. We construct a composite oxide–metal interface structure by anchoring highly dispersed CeCrO x nanoclusters onto metallic nickel via an ion-exchange method. This catalyst exhibits superior activity compared to conventional Ni/oxide catalysts with identical composition. Under atmospheric pressure at 220 °C, it achieves nearly 80% CO 2 conversion with over 99% methane selectivity and maintains excellent catalytic performance and structural stability during a 240-h continuous test. Systematic characterizations, including high-resolution transmission electron microscopy, X-ray photoelectron spectroscopy, CO 2 temperature-programmed desorption, and in situ DRIFTS reflectance infrared Fourier-transform spectroscopy, reveal that the synergistic modification by CeO 2 and Cr 2 O 3 not only optimizes the electronic structure of Ni to promote CO 2 adsorption and activation, but also enhances H 2 dissociation and intermediate conversion by regulating oxygen vacancy concentration and alkaline site distribution. Mechanistic studies indicate that the reaction follows a synergistic mechanism dominated by the formate pathway and assisted by the CO pathway. Moreover, the interfacial structure effectively stabilizes active sites and inhibits carbon deposition from CH 4 decomposition. This study provides a universal and effective strategy for designing Ni-based CO 2 conversion catalysts suited for mild reaction conditions and characterized by high energy efficiency.
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PubMed
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2025
·
IF 3.9
Rui Xing,Yanan Jiang,Jia Li,Pengxiang Liu,Yuan Liu,Cuijuan Zhang
Despite significant advances in catalytic activity for CO2 methanation, the catalyst stability has received less attention, limiting its application. This work prepared Ni-supported on MgO-Al2O3 with varying Mg/Al ratio (x) and studied their deactivation mechanism. The deactivation was accelerated by a stability test at 600 °C for 200 h. The activity comparison before and after the stability test reveals that the sample with x = 0.4 shows the best stability without obvious activity decline. While the sample with x = 0.3 is deactivated due to Ni sintering, samples with x = 0.5 and 0.6 are deactivated by the oxidation of Ni, which easily forms a solid solution with excess MgO but is difficult to reduce. That assertion is supported by various characterizations. Such an oxidative deactivation is first-time reported for Ni-based catalysts for CO2 methanation, which could shed light on their rational design and industrial application.
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Journal of Energy Chemistry
·
2025
·
IF 14.9
Zhengwen Li,Jiajun Zhang,Wei Pan,Shuairen Qian,Yuhan Wang,Dong Su,Liguo Wang,Binhang Yan
Single-atom catalysts for alkyne semi-hydrogenation have been extensively investigated due to their high metal utilization and improved olefin selectivity. However, their reactivity is hindered by the sluggish activation of reactants on isolated sites. Herein, a non-precise metal catalyst consisting of Ni-Cu hetero-diatomic pairs was prepared using a sequential deposition method. The diatomic sites catalyst exhibited an unprecedented activity among non-precious catalysts with over 98% conversion and 77 mol C2H2 mol metal −1 h −1 at 180 °C, whereas the single-atom catalysts of Cu/C and Ni/C were almost inert under the same conditions. Experimental and theoretical results revealed the crucial diatomic synergy between the Ni-Cu pairs, wherein acetylene was adsorbed on Ni sites and hydrogen was adsorbed on Cu sites, and the diatomic site enabled spontaneous desorption of ethylene. The superior activity of the diatomic catalyst was observed, resulting from the enhanced dominance of d -electrons of Ni near the Fermi level. The research demonstrates an approach to designing non-precise metal catalysts with extraordinary catalytic performance for alkyne hydrogenation.
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ACTA MATERIALIA
·
2026
·
IF 9.3
Yinghui Pu,Yiming Niu,Tongtong Gao,Junnan Chen,Bingsen Zhang
Atomically precise engineering of nanocatalyst surfaces is critical for advancing heterogeneous catalysis, yet achieving both structural uniformity and electronic tunability remains challenging. Here, we report an interstitial atom-mediated strategy for constructing anti-perovskite Ni 3 CuN nanocatalysts featuring square-planar Ni surfaces coordinated by nitrogen. The resulting nanoparticles adopt cubic morphologies, undergoing nitrogen-driven facet reconstruction from high-index {210}/{110} planes to thermodynamically favored {100} facets. Atomic-resolution imaging and simulations reveal that these surfaces preferentially expose Ni-N arrangements on ( 1 ¯ 00) terminations, in contrast to Ni-Cu configurations on (100) facets. This well-defined surface architecture, characterized by expanded Ni-Ni distances and electron-deficient Ni sites, leads to a substantial enhancement in acetylene hydrogenation selectivity (from 25.5% to 80.1%), while maintaining or surpassing the intrinsic activity of pure Ni and exhibiting excellent stability over 110 hours of testing. These findings establish an interstitial atom-based strategy for tailoring catalytic nanostructures with precise control over surface geometry and electronic structure.
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Energy Sources Part A-Recovery Utilization and Environmental Effects
·
2019
·
IF 0.894
X. Zhou,X. -Y. Wei,Y. -M. Ma,Z. -M. Zong
An active bifunctional Ni/Hβ was prepared by decomposing Ni(CO)4 to dispersive metallic Ni onto Hβ and applied in hydroconversion of oxydibenzene (ODB), which was used as a model reaction for the catalytic hydroconversion (CHC) of lignin or lignin oligomers to hydrocarbon fuels. The effects of reaction temperature, initial H2 pressure (IHP), and reaction time on the CHC of ODB was studied. Ni/Hβ was found to be effective for converting ODB into cyclohexane at 200°C under higher IHP. The mechanism for the CHC of ODB was discussed and the difference in mechanism under lower and higher IHP can be ascribed to the hydrogen-accepting abilities of unsaturated hydrocarbon products.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2022
·Vol. 47
·期 83
·35352-35364
·
IF 7.139
Zhichao Yu,Wei Zhang,Yongxi Zhang,Yaokun Fu,Ying Cheng,Sanyang Guo,Yuan Li,Shumin Han
Magnesium hydroxide (MgH 2 ) has excellent reversibility and high capacity, and is one of the most promising materials for hydrogen storage in practical applications. However, it suffers from high dehydrogenation temperature and slow sorption kinetics. Rare earth hydrides and transition metals can both significantly improve the de/hydrogenation kinetics of MgH 2 . In this work, MgH 2 –Mg 2 NiH 4 –CeH 2.73 is in-situ synthesized by introducing Ni@CeO 2 into MgH 2 . The unique coating structure of Ni@CeO 2 facilitates homogeneous distribution of synergetic CeH 2.73 and Mg 2 NiH 4 catalytic sites in subsequent ball milling process. The as-fabricated composite MgH 2 -10 wt% Ni@CeO 2 powders possess superior hydrogenation/dehydrogenation characteristics, absorbing 4.1 wt% hydrogen within 60 min at 100 °C and releasing 5.44 wt% H 2 within 10 min at 350 °C. The apparent activation energy of MgH 2 -10 wt% Ni@CeO 2 is determined to be 84.8 kJ/mol and it has favorable hydrogen cycling stability with almost no decay in capacity after 10 cycles.
研究领域:
材料科学
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无机化学
·
能源化学
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纳米催化
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氢能源存储
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Catalysts
·
2026
·Vol. 16
·期 1
·
IF 4
Xiaolong Chen,Hongli Wu,Peipei Zhang,Weina Zhang,Wei Jia,Pengfei Gao,Guo Tang,Fengyun Ma,Qinglong Xian,Noritatsu Tsubaki
Ni-based catalysts have been extensively investigated for lignin hydrogenation; however, they often exhibit limited phenol selectivity and poor catalytic stability. To address these challenges, we introduced Cu as a promoter, resulting in the development of NiCu/ZSM-5 catalysts with significantly enhanced phenol selectivity and durability. Characterization studies revealed that Cu species form an alloy structure with Ni, which effectively suppresses the sintering of Ni nanoparticles during the catalytic process, thereby maintaining consistent performance over multiple reaction cycles. Furthermore, the Cu-Ni alloy demonstrated improved hydrogen activation capability while reducing overall H2uptake, leading to a marked increase in phenol selectivity compared to the Cu-free Ni/ZSM-5 catalyst. As a result, the Ni1Cu1/ZSM-5 (Ni/Cu molar ratio = 1:1) catalyst achieved a lignin conversion of 69.8% and a phenol selectivity of 84.4%, with negligible performance degradation over 8 cycles. The strategy presented in this work may offer an effective approach for enhancing the performance of industrial catalysts in lignin upgrading processes.
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Frontiers of Chemical Science and Engineering
·
2025
·Vol. 19
·期 8
·1-13
·
IF 4.5
Han Meng,Guo Dan,Zhang Xuening,Yao Yitong,Zhang Haozhe,Lu Yifei,Fu Zelong,Lv Jing,Wang Yong,Cheah Joe Yeang,Wang Shengping,Ma Xinbin
The upgrading of underutilized methane in shale gas with anthropogenic CO 2 can produce the value-added syngas via dry reforming. Nickel-based catalysts, due to their efficiency and cost-effectiveness, have received widespread attention. However, Ni-catalyzed dry reforming of methane is usually subjected to sintering or coking-induced instability. To address these issues, a series of Al 2 O 3 -supported nickel nanoparticle catalysts with uniform sizes are synthesized by varying the calcination temperatures and applied in methane dry reforming (DRM). Ni/Al 2 O 3 -700 °C catalyst behaves better catalytic performance compared to the other catalysts, which can be attributed to its higher metal dispersion and stronger metal-support interaction. In addition, the abundant moderate-strength basic sites and optimal Al IV /Al VI ratio can promote the adsorption and activation of CO 2 and suppress the deep cracking of CH 4 for Ni/Al 2 O 3 -700 °C catalyst, respectively, causing the enhancement of anti-coking performance. Furthermore, combining CH 4 -temperature programmed surface reaction and in situ Fourier transform infrared spectroscopy demonstrates that the presence of CO 2 can promote the activation of CH 4 for Ni/Al 2 O 3 -700 °C catalyst, which is rate-determining step for DRM system. These findings provide valuable theoretical guidance for the rational design of Ni-based catalysts with enhanced catalytic performance.
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Optics Continuum
·
2023
·Vol. 2
·期 3
·554-563
·
IF 0
Shiqing Zhao,Wenwen Xu,Yanhua Liu
Flexible electrochromic devices (ECDs) are a future technology with huge impact on wearable displays, energy saving, and adaptive camouflage. In this work, we used embedded nickel (Ni) mesh transparent electrodes combined with a thin polymer film of poly(3,4-ethylenedioxythiophene): polystyrene sulfonate (PEDOT:PSS) to build a multifunctional flexible electrochemical device that integrates the functions of electrochromic and supercapacitor devices. The multi-layer architecture improves the device performance in terms of optical contrast and mechanical strength. Ni-mesh electrodes have a high optical transparency (84.8%), good mechanical flexibility, and low resistance (0.5 Ω/sq), which is conducive to efficient electron injection, benefiting to the response time of the constructed device. The thin polymer film of PEDOT:PSS is an electrochromic (EC) material that also uniformly distributes electrons for a uniform coloration. The fabricated device shows fast response to coloring and bleaching (1.2 and 0.8 s, respectively), an absolute transmittance contrast ratio of 40%, and area capacitance of up to 2.48 mF/cm2. Furthermore, the device exhibits excellent flexibility, and the electrochromic and electrochemical properties of the device are only partially diminished upon folding, which is beneficial for the construction of multifunctional flexible electrochromic devices. With its response time, working stability, and bending ability, our multifunctional device paves the way for the next generation of flexible electronics.
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JOURNAL OF ETHNOPHARMACOLOGY
·
2022
·
IF 5.195
Yajie Cai,Xiaojiaoyang Li,Qi Han,Jinzhao Bai,Qi Zheng,Rong Sun,Runping Liu
Ethnopharmacological relevance Ulcerative colitis (UC) is widely believed to be a leading risk factor of colorectal cancer . Gut microbiota is a known vital player in the progression of UC. Si–Ni-San (SNS) has been considered to effectively treat colitis in clinical practice during thousands of years, yet whether SNS ameliorated acute colitis mouse model by modulating intestinal flora has not been distinctly elucidated. Aim of the study Our study aimed to elucidate the effect of SNS against acute murine colitis and focused on the underlying mechanisms of SNS targeting gut microbiota . Materials and methods 16S RNA sequencing, molecular biological analysis, and fecal microbiota transplants (FMT) were conducted to reveal the mechanisms of SNS in regulating gut microbiota. Results In our study, SNS dramatically inhibited DSS-induced acute inflammatory responses by improving gut microbiota dysbiosis , as evidenced by decreased abundance proinflammatory species, upregulated abundance of anti-inflammatory species and potentially altered microbiota metabolite metabolism. Additionally, intestinal flora knockout and FMT experiments confirmed that the therapeutic effect of SNS on colitis was dependent on gut microbiota, and specifically on favoring the growth of potential probiotics , Akkermansia genus. Furthermore, we found that SNS alone and SNS combined with Akkermansia muciniphila ( A. muciniphila ) increased Mucin 2 (MUC2) production, thus enhancing the competitive edge of A. muciniphila among pathogenic gut microbiota. Conclusion Our study shed lights on the underlying mechanism of SNS in attenuating acute murine colitis from the perspective of intestinal flora and provides novel insights into the discovery of adjacent therapeutic strategy against colitis based on SNS and probiotics. Classification Gastro-intestinal system
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PubMed
高影响因子
AICHE JOURNAL
·
2023
·Vol. 69
·期 10
·e18161
·
IF 3.7
Zhanshuai Ma,Tianyu Zhang,Lili Lin,Aijuan Han,Junfeng Liu
Developing highly active, selective, and stable electrocatalysts for the CO 2 reduction reaction (CO 2 RR) is essential to relieve the greenhouse effect and the energy crisis. Traditional catalytic electrodes require ionomer binders, which inevitably impose undesired high CO 2 transport resistance and block the active sites. Herein, Ni single atoms anchored on nitrogen-doped carbon nanoarrays (denoted as Ni-SAC-NA) were developed as the electrode without additional ionomers for efficient CO 2 RR. The unique nanoarray structure provided a higher specific surface area, more exposed active sites, and enhanced electron/mass transport due to its short diffusion pathway and ionomer-free nature. As a result, the Ni-SAC-NA electrode exhibited enhanced activity of CO 2 RR and selectivity towards CO with Faradaic efficiency of 96.7%, turnover frequency of 27,504 h −1 , and cathodic energy efficiencies of 54.9% at −0.88 V (vs. RHE). Our findings provide a rational design strategy for CO 2 RR electrocatalysts by constructing ionomer-free electrodes.
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