ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
You-Zhou Yang,Yun Rong,Yuan-Yuan Li,Mengmeng Ma,Dan Chen,Hang Lu,Chang Wu,Boyuan Shen,Jin-Ping Guan,Ming-Peng Zhuo
Smart materials demonstrate fascinating responses to environmental physical/chemical stimuli, including thermal, photonic, electronic, humidity, or magnetic stimuli, which have attracted intensive interest in material chemistry. However, their limited/harsh stimuli-responsive behavior or sophisticated postprocessing leads to enormous challenges for practical applications. Herein, we rationally designed and synthesized thermochromic Ni(II) organometallic [(C2H5)2NH2]2NiCl4–xBrx via a facile mechanochemical strategy, which demonstrated a reversible switch from yellow to blue color with a tunable phase-transition temperature from 75.6 to 61.7 °C. The simple electrospinning technology was applied to fabricate thermochromic Ni(II) organometallic-based nanofiber membranes for temperature monitoring. Furthermore, the organic charge-transfer cocrystal with a wide spectral absorption of 300–1950 nm and a high-efficiency photothermal conversion was combined with thermochromic Ni(II) organometallics for the desired dual-stimuli photo/thermochromism. This work supplies a new strategy for realizing multiple stimuli-responsive applications, such as thermal/light sensor displays and information storage.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Shitong Yu,Leilei Bie,Zhicheng Luo
Lignin is mainly composed of three basic C9 phenolic monomers, which makes it a formidable challenge to selectively produce C8 phenolic monomers, precursors for the ethylbenzene and styrene, due to intricate C–O and C–C cleavages. Here, we introduce a Ni 0.5% /AlN catalyst, featuring atomically dispersed Ni on a basic AlN support. The catalyst yields 52.7 % relative phenolic monomers with an unparalleled selectivity of 58.7 % for C8 phenolic species (Phenol, 4-ethyl, and Phenol, 4-ethyl-2-methoxy). The inherent basic sites within the AlN support crucially facilitate the formation of quinone intermediates, subsequently directed by single-atom Ni into C8 phenolic monomers. The catalyst showcases robust recyclability over five cycles, because of the strong interactions between Ni and AlN support. This study reveals a synergistic interplay between single-atom Ni and the basic support, paving a transformative pathway for the selective valorization of lignin.
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Molecular Catalysis
·
2024
·
IF 3.9
Guili Luan,Guihua Yang,Hongyu Wang,Jiaxuan Li,Haojie Sun,Mengyao Sun,Changfei Shi,Shitao Yu,Ji-Jun Zou,Genkuo Nie
(Alkyl-)cyclohexane diols are of high value as industrial reagents and resources, but current producing methods are still unsustainable. Herein, a new method of producing (alkyl-)cyclohexane diols using lignin derived phenols with yield as high as 91.2 % by selective hydrogenolysis is firstly achieved over Nb 2 O 5 and Ni/MCM-41. The hydrogenolysis is completed by designing two-step reactions compositing of selective crack of C(sp 3 )-O bond and selective hydrogenation of benzene ring of lignin derived phenols to achieve a high selectivity. Nb 2 O 5 demonstrates superior activity and long-life time in C(sp 3 )-O bond cleavage compared to commercial solid acids. The robust catalytic performance was thoroughly analyzed through detailed characterization and attributed to the abundant oxygen vacancies produced, which lead more strong L acids and adsorb the methoxy group in lignin derived phenols and at the same time interact with the acid sites to facilitate the cleavage of the C(sp 3 )-O bond. The consequent selective hydrogenation of benzene ring is completed by Ni/MCM-41 easily. More lignin derived phenols are explored in this reaction with (alkyl-)cyclohexane diols universally synthesized. This work provides a new application of lignin derived phenols to synthesize value-added chemicals and makes contribution to sustainable development by biorefineries.
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Molecular Catalysis
·
2025
·
IF 4.9
Zhen Zhang,Minghui Yu,Meiqing Shen,Wei Li,Gurong Shen
Ni-based catalysts, as non-noble metal alternatives, are widely regarded for their potential in ammonia decomposition for hydrogen production. However, their performance at low temperatures is suboptimal, necessitating the addition of promoters and a clear understanding of their mechanisms to enhance catalytic activity. In this study, we have successfully improved the low-temperature ammonia decomposition performance of Ni/CeO 2 by incorporating alkaline earth metals and conducted a comprehensive analysis of the underlying structural and electronic effects. The findings reveal that alkaline earth metals can enhance the basicity of the catalyst and increase electron density around the active metal sites, thereby facilitating the rate-determining step of recombination and desorption of N atom. Moreover, the presence of alkaline earth metals disrupts hydrogen adsorption stability on the catalysts, effectively mitigating the impact of hydrogen inhibition. Based on systematic kinetic experiments, a kinetic model was developed that accurately captures the hydrogen inhibition effect for Ni/CeO 2 catalysts. The insights into the promotional mechanisms of alkaline earth metals offer theoretical guidance for the development of highly active and cost-effective catalysts for ammonia decomposition.
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Nanomaterials
·
2024
·Vol. 14
·期 10
·853
·
IF 4.4
Xiaohan Wang,Han Tian,Libo Zhu,Shujing Li,Xiangzhi Cui
The application of electrochemical hydrogen evolution reaction (HER) for renewable energy conversion contributes to the ultimate goal of a zero-carbon emission society. Metal phosphides have been considered as promising HER catalysts in the alkaline environment, which, unfortunately, is still limited owing to the weak adsorption of H* and easy dissolution during operation. Herein, a bimetallic NiCoP-2/NF phosphide is constructed on nickel foam (NF), requiring rather low overpotentials of 150 mV and 169 mV to meet the current densities of 500 and 1000 mA cm−2, respectively, and able to operate stably for 100 h without detectable activity decay. The excellent HER performance is obtained thanks to the synergetic catalytic effect between Ni and Co, among which Ni is introduced to enhance the intrinsic activity and Co increases the electrochemically active area. Meanwhile, the protection of the externally generated amorphous phosphorus oxide layer improves the stability of NiCoP/NF. An electrolyser using NiCoP-2/NF as both cathode and anode catalysts in an alkaline solution can produce hydrogen with low electric consumption (overpotential of 270 mV at 500 mA cm−2).
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CATALYSIS LETTERS
·
2025
·Vol. 155
·期 3
·1-11
·
IF 2.4
Wen Chenglong,Liu Kang,Lu Yi,Wu Xintian,Li Shuning,Lu Mohong,Zhu Jie,Li Mingshi,Song Chunshan,Lu Xiaosong
Ni/SAPO-11 catalysts with highly dispersed Ni (TA-Ni/SA-11) were prepared using tartaric acid as a dispersant. The effect of the tartaric acid content on the physiochemical properties of the TA-Ni/SA-11 catalysts and their n-heptane hydroisomerization performance were investigated. TA-Ni/SA-11 exhibits smaller Ni particles and more Ni active sites in comparison to conventional Ni/SAPO-11 prepared via the impregnation method due to the interaction between tartaric acid and Ni 2+ . As the molar ratio of tartaric acid and Ni 2+ (n TA /n Ni ) increases, the number of Ni active sites in TA-Ni/SA-11 rises, while the surface area and relative crystallinity decrease because of the dealumination of SAPO-11. When n TA /n Ni is 0.75, 0.75TA-Ni/SA-11 presents the highest n-heptane conversion of 82.4% and isomer selectivity of 90.5%, as well as the lowest cracking selectivity of 9.0% at 380 °C, 1.5 MPa, 2 h − 1 , and a volume ratio of H 2 to n-heptane of 400 among these catalysts. Graphical
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Catalysts
·
2025
·Vol. 15
·期 9
·812
·
IF 4
Xinru Gao,Han Meng,Changan Wang,Jinzhang Tao,Hongyi Gao
The development of highly efficient catalysts for the hydrogenation of dicyclopentadiene (DCPD) remains a critical challenge. In this study, we designed a series of bimetallic Ce–Ni metal–organic framework (MOF)-derived nanocatalysts by precisely tuning the Ce/Ni ratio and calcination temperatures. The optimized catalyst, Ni–CeO2(7:3)@C–400 °C, featuring highly dispersed carbon-coated Ni nanoparticles, achieved complete hydrogenation of DCPD to tetrahydrodicyclopentadiene (THDCPD) with 100% conversion and nearly 100% selectivity within 2 h under 100 °C and 2 MPa. The porous carbon framework significantly facilitated the diffusion and accessibility of DCPD molecules, combined with Ce species reconstructing the electronic structure of Ni active centers through electronic interactions, synergistically enhancing the hydrogenation efficiency. Furthermore, the catalyst demonstrated good structural stability. This work not only provides a robust strategy for the rational design of bimetallic MOF-derived catalysts but also highlights their potential for practical applications in industrial hydrogenation processes.
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MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Ying-ying Hu,Caiyue Gao,Xiao-qin Wu
Environmental pollution is a hot topic of concern for countries around the world. Therefore, {[Ni(NDC)(phen)(H 2 O)]• n ( Ni-1 , NDC = 2,6-naphthalenedicarboxylic acid, phen = o-phenanthroline), a 1D Ni-MOF, was synthesized using the solvothermal method as an electrochemical-fluorescence dual sensor for detecting phenylenediamine isomers. By the difference in the position of the reduction peaks, it is possible to distinguish between isomers while detecting them. The electrochemical behavior of the Ni-1 /GCE sensing phenylenediamine isomers was analyzed by cyclic voltammetry (CV) and differential pulse voltammetry (DPV). The LODs of o-PDA, m-PDA and p-PDA were 2.567 μM, 1.984 μM and 0.4003 μM in the detection range of 5–50 μM, respectively. Ni-1 was highly stable in aqueous solution (H 2 O), so it was dissolved in H 2 O to fabricate the Ni-1 /H 2 O fluorescence sensor. Ni-1 /H 2 O exhibited Stern-Volmer quenching constants of 6.080 × 10 4 M −1 , 2.086 × 10 3 M −1 , and 6.417 × 10 3 M −1 for o-PDA, m-PDA, and p-PDA, respectively. In addition, this dual sensor still shown excellent immunity to interference under the organic interferents. This work provides an efficient, convenient, and sensitive dual sensing method for the detection and differentiation of phenylenediamine isomers, which is of great significance for the detection of aromatic amines in the fields of wastewater discharge, environmental protection, and food safety.
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APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Yingying Jin,Kaihao Fan,Miao Feng,Yaoguang Wang,Hongfeng Chen,Xuesong Liu
This study investigates synergistic effects in Ni/CeO 2 catalysts for ammonia decomposition, comparing impregnation and mechanical mixing preparation methods. The impregnated catalyst achieved >90 % NH 3 conversion above 500 °C, outperforming Ni/SiO 2 and mixed counterparts. Strong interactions at the Ni-CeO 2 interface facilitated the formation of Ni-O-Ce bonds, lattice distortion, and oxygen vacancies (O v )/Ce 3+ species, enhancing Ni dispersion (34.7 nm vs. 73.1 nm) and electron transfer. Optimal NH 3 pretreatment (550 °C, 1.5 h) generated metallic Ni 0 as the primary active species, with higher Ni 0 content (XPS) and reducibility (H 2 -TPR). The novelty lies in establishing how NH 3 pretreatment dynamically assembles contiguous Ce 3+ -O v -Ni 0 triads. These sites facilitate rate-limiting N 2 desorption through localized electron donation from O v and Ce 3+ to Ni 0 , which weakens N-N bonds (NH 3 -TPD). Impregnation-derived synergy: (i) enhances Ni dispersion/reduction, (ii) promotes O v formation, and (iii) enables NH 3 -pretreatment-induced assembly of contiguous Ce 3+ -O v -Ni 0 triads that create electron-rich sites, lowering the activation barrier. This work provides a foundation for designing cost-effective catalysts via atomic-scale control of metal-support interactions.
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COMPOSITES PART B-ENGINEERING
·
2025
·
IF 14.2
Chunmiao Liu,Yurun Feng,Haibin Sun,Qiangqiang Hu,Hui Xiao,Xue Guo,Huaiqing Zhang
The increasingly complex electromagnetic environment and escalating stealth technology requirements pose unprecedented challenges to multifunctional electromagnetic wave (EMW) absorbing materials. While significant progress has been made, existing SiBCN material systems still struggle to simultaneously achieve broadband absorption and strong attenuation. In response to this demand, we propose a Fe-Co-Ni ternary co-doping strategy from the perspective of multiple doping and magnetic medium coupling. By precisely controlling the content of magnetic elements, the synergistic effect between magnetic loss and dielectric loss is realized. The experimental results show that the minimum reflection loss (RL min ) of the optimized SiBCN/Fe-Co-Ni fibers reach -53.19 dB, and a broadband absorption of 5.36 GHz is achieved at a thickness of 1.98 mm. More importantly, the material maintains excellent stealth performance across a wide range of incident angles. Capitalizing on these outstanding properties, we have successfully designed a low radar cross-section (RCS) stealth antenna. The antenna exhibits a 27.5 dBsm RCS reduction at 9.24 GHz. This work not only clarifies the synergistic mechanism of multiple magnetic doping to regulate electromagnetic parameters, but also provides new ideas for the development of new generation of smart stealth materials and devices.
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Journal of Magnesium and Alloys
·
2025
·
IF 13.8
Zexuan Yang,Zhendong Ma,Yongjin Zou,Cuili Xiang,Lixian Sun,Yongpeng Xia,Yong Shen Chua
Magnesium hydride serves as a promising solid-state hydrogen storage material owing to its high potential. However, its practical applications are constrained by the high enthalpy of hydrogen absorption and slow kinetics. In this study, we prepared a Ni/Ti 3 O 5 @graphene oxide (GO) dual-heterojunction composite material via solvent heating, electrostatic adsorption, and calcination to improve the hydrogen storage capabilities of MgH 2 . Adding Ni/Ti 3 O 5 @GO to MgH 2 lowered the initial dehydrogenation temperature of MgH 2 to 183 °C; at a dehydrogenation temperature of 275 °C, 6.4 wt.% of H 2 escaped from the MgH 2 bulk. In addition, the hydrogen storage material absorbed 1.8 wt.% H 2 at 30 °C for 30 min. The calculated activation energy of dehydrogenation was 48.221 ± 0.141 kJ·mol −1 , which was significantly lower than that of the ball-milled MgH 2 (112.63 ± 1.44 kJ·mol −1 ). Mechanistic analysis results revealed that the heterojunction constructed from the multiphase compound system provided a large number of active sites and hydrogen diffusion routes, resulting in a synergistic catalytic effect that enhanced the hydrogen storage capacity of MgH 2 . In this work, we clarified the compositions of fuzzy interfaces in heterostructured materials by conducting ultraviolet photoelectron spectroscopy tests and identified key composite materials for the formation of heterojunctions.
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Chinese Journal of Mechanical Engineering
·
2025
·
IF 4.5
Daosen Song,Guangming Zhang,Mingli Ai,Peikai Duan,Chuanlong Liu,Quan Xu,Dandan Qu,Hongbo Lan
Ceramic/metal functional gradient materials (FGMs) are used in a wide range of applications in energy, machinery, aerospace and other fields due to the advantages of both ceramic and metal materials. However, conventional laser additive manufacturing faces significant challenges, such as consequential residual thermal stresses due to the large physical differences between ceramics and metals, which lead to warpage deformation and interlayer cracking of the material. Therefore, this paper introduces a new strategy to prepare ZrO 2 /Ni FGMs based on shrinkage-matched materials extrusion 3D printing. Firstly, the consistency of shrinkage of ZrO 2 and Ni was achieved with a minor volumetric shrinkage different of 0.6% by adjusting the solid content of the slurry and the sintering temperature. Then, the microstructure and mechanical properties of FGMs with different numbers of gradient layers (2, 3, 5) and thicknesses (100 µm, 150 µm, 200 µm) were investigated, demonstrating a gradual elemental and mechanical gradient. Through the analysis of fracture cracks and fracture surface morphology, the fracture process and mechanisms of the samples were elucidated. Finally, several typical structures FGMs were prepared from pure metal to pure ceramic in both XY and Z directional gradient. Overall, it addresses the challenges associated with fabricating deformation-free ceramic/metal FGMs and developing strong bonds between ceramics and metals.
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