JOURNAL OF ALLOYS AND COMPOUNDS
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2026
·
IF 6.7
Hao Fu,Yishan Yao,Yang Xu,Yufeng Zhang,Qinghua Zhao,Xichao Dong,Laifei Cheng,Xingang Luan
High-temperature multi-film layer sensors provide important technical support for monitoring key parameters in extreme environments. However, the lack of sensitive layer electrode materials with excellent high-temperature conductivity and structural stability limits their application in harsh working conditions. In this study, SiHfBCN(Ni) ceramic thin films with excellent electrical conductivity were prepared at a relatively low pyrolysis temperature by introducing Ni to chemically modify the SiHfBCN precursor. The conductive mechanism of the films was clarified through microstructural analysis. By regulating the Ni content, a smooth and uniform film morphology was obtained. By regulating the pyrolysis temperature, the catalytic effect of Ni was significantly enhanced, generating abundant various nanoparticles including graphitized carbon, core-shell structured Ni@C and HfC x N 1-x nanoparticles within the amorphous matrix, forming multiple nanocomposite ceramic structures, and constructing an efficient three-dimensional conductive network. The minimum room-temperature resistivity decreased from 1494 Ω·cm before modification to 2.854 Ω·cm after modification. At temperatures up to 1200 °C, the films deliver enhanced electrical conductivity relative to room temperature and maintain stable morphological structure. These findings highlight the great application potential of SiHfBCN(Ni) thin films in the field of high-temperature thin-film electrodes.
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PHYSICAL REVIEW B
·
2026
·Vol. 114
·期 1
·014409
·
IF 3.9
Luozhao Zhang,Liqiang Zeng,Jinbo Yang,Yongfeng Mei,Zhongchong Lin,Zhigao Huang,Jizhai Cui
The regulation of magnetic anisotropy in two-dimensional (2D) van der Waals (vdW) ferromagnets is critical for enabling spintronic and solid-state cooling applications, yet the microscopic doping mechanism remains poorly understood, as conventional ideal-lattice models fail to reconcile the moderate structural and magnetic evolution observed in experiments. In this work, we investigate Ni-doped ${\mathrm{Fe}}_{3}{\mathrm{GaTe}}_{2}$, a room-temperature 2D ferromagnet, combining systematic magnetization measurements and first-principles calculations based on the realistic defective lattice structure of ${\mathrm{Fe}}_{3}{\mathrm{GaTe}}_{2}$. We demonstrate an intrinsic defect-assisted occupation mechanism: Ni dopants preferentially substitute the preexisting interstitial Fe atoms in the vdW gap rather than inserting into empty interlayer sites. This mechanism accounts well for all our experimental observations, including the minor $c$-axis contraction, the 80% reduction of magnetocrystalline anisotropy energy with preserved out-of-plane easy axis, and the monotonic decrease of Curie temperature (${T}_{\text{C}}$) and saturation magnetization. Furthermore, we demonstrate that Ni doping effectively tunes the anisotropic magnetocaloric effect: The anisotropy of magnetic entropy change decreases from 0.68 to $0.29\phantom{\rule{0.28em}{0ex}}\text{J}\phantom{\rule{0.16em}{0ex}}{\text{kg}}^{\ensuremath{-}1}\phantom{\rule{0.16em}{0ex}}{\text{K}}^{\ensuremath{-}1}$, while the relative cooling power exhibits a nonmonotonic evolution, reaching an optimal value of $156\phantom{\rule{0.28em}{0ex}}\text{J}\phantom{\rule{0.16em}{0ex}}{\text{kg}}^{\ensuremath{-}1}$ at 4.6% Ni doping. The evolution of critical exponents $n$ and $m$ confirms that Ni doping introduces magnetic disorder, broadening the magnetic phase transition. Our results resolve the discrepancy between ideal-lattice theoretical predictions and experimental observations, providing a clear microscopic picture for anisotropy engineering in 2D magnets.
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ELECTROANALYSIS
·
2026
·Vol. 38
·期 8
·e70197
·
IF 2.6
He Lu,Ling Wang,Zhiyuan Chen,Haoyong Yin,Hui Wang,Shengji Wu
A heterostructured Ni@Ni 3 N/NCNTs electrocatalyst was rationally designed via a MOF-derived strategy combined with controlled surface nitridation to achieve highly efficient nonenzymatic glucose sensing. In this architecture, metallic Ni nanoparticles anchored on a three-dimensional N-doped carbon nanotube framework were selectively converted into a thin Ni 3 N surface layer, forming abundant Ni/Ni 3 N heterointerfaces while preserving a conductive Ni core. Electrochemical studies reveal that the engineered heterointerfaces significantly reduce charge-transfer resistance and increase electrochemically active surface area, thereby promoting the generation of NiOOH species and facilitating glucose oxidation. As a result, the Ni@Ni 3 N/NCNTs electrode exhibits a high sensitivity of 685.07 μA mM −1 cm −2 , a low detection limit of 0.34 μM, and a wide linear range of 1–7000 μM for nonenzymatic glucose detection. Furthermore, integration with a smartphone-enabled electrochemical platform enables portable and real-time glucose analysis, demonstrating the strong potential of this surface-engineered heterostructure for practical portable sensing applications.
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ELECTROCHIMICA ACTA
·
2026
·
IF 5.8
Ruipeng Hao,Fangyuan He,Xuwen Gao,Wenbo Lu,Sumin Bian,Hugo Vankelecom,Chenzhong Li
Myricetin is a naturally occurring flavonoid found in various fruits and medicinal plants, possessing significant antioxidant and pharmacological activities. Accurate determination of myricetin is crucial for food quality control and pharmaceutical analysis. In this work, we synthesized a hierarchical composite consisting of cobalt-based Prussian blue analogue grown on Ni-MOF nanosheets supported on nickel foam (Co-PBA@Ni-MOF/NF) and employed it as a sensitive electrochemical sensor for myricetin detection. The composite combines the high conductivity and large surface area of Ni-MOF with the uniform catalytic sites of Co-PBA, significantly enhancing the electrocatalytic oxidation of myricetin. The as-prepared myricetin electrochemical sensor exhibited a wide linear range of 0–500 μM, a low detection limit of 0.168 μM, and high sensitivity of 1126 μA·mM⁻ 1 ·cm⁻ 2 . Furthermore, this sensor demonstrated excellent selectivity, stability, and reproducibility. Importantly, the sensor was successfully applied for the quantitative detection of myricetin in juice samples, achieving a satisfactory recovery rate of 98.15%–101.37%, demonstrating its practical utility for myricetin detection in real food samples.
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FUEL
·
2026
·
IF 7.8
Yunfeng Lei,Huilin Liu,Shunxiang Wang,Fu Ze Ho,Wen Da Oh,Yong Foo Wong,Yongjin Zou,Yong Shen Chua
Hydrazine borane (N 2 H 4 BH 3 ) has been recognized as an attractive hydrogen storage material owing to its high hydrogen capacity of 15.4 wt%. However, the methanolysis of N 2 H 4 BH 3 remains a challenge, as only BH 3 moiety of N 2 H 4 BH 3 can be utilized to produce H 2 . In the present work, we reported an efficient Cu@Ni/MoO 3 core–shell catalyst that is capable of fully utilizing the H atoms on both BH 3 and N 2 H 4 moieties of N 2 H 4 BH 3 via methanolysis, releasing 5.5 equivalents of gas at 50 °C. This study represents the most efficient catalyst for methanolysis of N 2 H 4 BH 3 reported to date. The improved catalytic activity of Cu@Ni/MoO 3 catalyst may be attributed to the collective improvement on the catalyst, which includes increased specific surface area of the catalyst, formation of an electron deficient Cu@Ni catalyst surface induced by MoO 3 and favorable reacting environment involving KOH as a catalyst promoter. The development of low-cost and highly efficient catalysts may encourage the application of N 2 H 4 BH 3 as a promising hydrogen storage material.
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CHINESE JOURNAL OF CATALYSIS
·
2026
·
IF 17.2
Haonan Li,Wa Gao,Kangli Ma,Jian Lei,Olim Ruzimuradov,Akhtam Samiev,Ya Chen,Jingxiang Low,Yue Li
Cocatalyst loading has been extensively adopted in photocatalysis for enhancing photocatalytic performance. However, the sluggish interfacial charge dynamics between cocatalyst and photocatalyst has restricted the wide applications of such a strategy. Herein, we introduce the Ni–N interfacial bonds between lamellar nitrogen-vacancy-rich g-C 3 N 4 /CoNi 2 S 4 nanoparticles (CN-V N /CoNi 2 S 4 ) composite material to bridge the photogenerated charge carrier separation at their interface. Specifically, extended X-ray absorption fine structure analysis reveals that these Ni–N interfacial bonds are originated from the bonding of CoNi 2 S 4 with the nitrogen atoms adjacent to the nitrogen vacancies (V N ) in g-C 3 N 4 . Experimental evidence and theoretical calculations reveal that Ni–N interfacial bonds cannot only cause an intimate contact interface between CN-V N /CoNi 2 S 4 , but also modulate the charge distribution on the CN-V N and CoNi 2 S 4 , further boosting the photogenerated charge carrier separation. More interestingly, this tailored interfacial microenvironment significantly reduces the energy barrier for key intermediates formation while modulates the rate-determining step from *COOH generation to CO desorption, enabling efficient and controllable CO production. This work establishes a methodological framework for engineering advanced photocatalysts, enabling high-efficiency conversion of solar energy into clean fuels.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2026
·
IF 5.4
Liubin Shi,Wanjie Xu,Laisen Wang,Dong-Liang Peng,Yuanzhi Chen
Nickel (Ni) ultrafine particles are widely used for the fabrication of inner film electrodes of multilayer ceramic capacitors (MLCCs). In this study, we report an approach to prepare Ni@NiO core-shell ultrafine particles with a size of about 120 nm. Instead of using commonly commercial Ni particles as Ni cores, we prepare Ni ultrafine particles via an aqueous solution reduction, and then conduct a crystallization optimization, followed by a controlled oxidation. NiO shells with a tunable shell thickness ranging from 4 to 7 nm are formed on Ni cores. The Ni@NiO core-shell ultrafine particles exhibit significantly improved oxidation resistance and thermal shrinkage resistance. The corresponding sintered film shows enhanced film integrity and continuity with a low resistivity of 10.6 μΩ cm. The prepared Ni@NiO core-shell ultrafine particles may find potential applications in the field of high-capacity MLCC with thinner Ni electrode layers.
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ChemCatChem
·
2026
·Vol. 18
·期 6
·e01859
·
IF 4.1
Jiahao Qi,Shangmeng Ning,Yuan Liu,Yongdan Li,Cuijuan Zhang
Developing high-performance Ni-based catalysts is critical for the practical application of dry reforming of methane (DRM). Herein, the 10wt%Ni/CeO 2 catalyst was mediated by CeAlO 3 formed by interfacial reaction between impregnated Al species and the CeO 2 support. The resultant CeAlO 3 has a significant influence on the structural properties and the catalytic performance. CeAlO 3 can enhance the dispersion of Ni, introduce more oxygen ion vacancies and medium basic sites, which contribute to the high activity and high coking resistance. Furthermore, the enhanced interaction between Ni and the support impedes the sintering of Ni nanoparticles, leading to improved stability. The sample with Al:Ce molar ratio of 0.1 demonstrates impressive performance, at 800°C and 120,000 mL/(h·g cat ), the CH 4 , CO 2 conversion and H 2 /CO ratio are 94.3%, 90.7%, and 0.92, respectively. The activity decreases by <5% over 200 h test at 750°C with a carbon accumulation rate of only 0.54 mg C/(g cat ·h).
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FUEL
·
2026
·
IF 7.8
Jian Wang,Yu Zhao,Tianhua Yang,Xinyong Diao,Yao Tong,Shuang Cui,Bingshuo Li,Rundong Li
Guaiacol, an important lignin-derived compound, presents a central challenge in the efficient upgrading of biomass into sustainable biofuels. Conventional conversion processes are often limited by dependence on corrosive acids, noble metals, or external hydrogen sources, leading to increased costs and safety concerns. In this study, we developed a hydrothermal conversion method that enables guaiacol to catechol transformation without the need for external hydrogen or inorganic acids. This was accomplished using transition-metal-based n Ni– y MoO x /Nb 2 O 5 catalysts capable of cleaving C–O bonds. The results showed that the Ni/MoO x ratio was critical in governing the formation of the NiMoO 4 spinel phase while inducing a strong metal–support interaction (SMSI) that directly affected the surface acidity and oxygen vacancy concentration. Using the 5Ni-5MoO x /Nb 2 O 5 catalyst (Ni/Mo = 1:1) at 300 °C for 2 h, 26.15% guaiacol conversion was achieved, with catechol selectivity 12.9-fold higher than in the noncatalytic system. This superior performance originated from a synergistic effect between the moderate acid strength and the high concentration of defective oxygen vacancies, which collectively drove the selective cleavage of the O–CH 3 bond. The produced catechol serves as a pivotal platform intermediate for synthesizing renewable fuel additives and advanced biofuel components. This study presents a sustainable catalyst design strategy for converting lignin resources into valuable biofuel precursors.
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NEW JOURNAL OF CHEMISTRY
·
2026
·
IF 2.6
Tao Zhou,Kun-Lang Lu,Tao Li,Rui Xiao
Decoupled water splitting offers a safe and efficient route for hydrogen production. However, its practical application remains constrained by issues such as low electrode discharge capacity and poor structural stability. In this study, framework-integrated Ni(OH)2 anodes for membrane-free decoupled water splitting are fabricated. The framework-integrated electrode structure with a carboxymethyl cellulose-based binder affords a well-developed conductive network and robust interfacial contact. This architecture delivers higher discharge capacity and enhanced cycling stability relative to conventional coated electrodes. In addition, the use of nickel powder as the conductive additive improves electronic conductivity, resulting in higher discharge capacity and excellent hydrogen-production performance. The framework-integrated Ni(OH)2 anode maintains a stable structure and electrochemical performance over 100 decoupled cycles, achieving a Faradaic efficiency of 97.3%. The electrical energy consumption for hydrogen production is 3.40 kWh m-3 H2 at 50 mA cm-2.
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ACS Catalysis
·
2026
·
IF 13.6
Chufei Wang,Jianing Li,Tao Zhang,Zemin Chen,Aohua Cheng,Ziyi Zhang,Ying Zhang,Aiqin Wang
Abstract Efficient low-temperature hydrogenation of both heteroaromatic and benzenoid compounds using nonprecious metals remains challenging. Here, we report a nitrogen-doped carbon interfacial modification that creates a local hydrogen field (LHF) at the Ni/NC/HAP interface. In situ spectroscopy, kinetic isotope measurements, and molecular dynamics simulations elucidate the origin and kinetic basis of this interfacial microenvironment. Initially, H2 dissociates at Ni sites, and H atoms rapidly migrate across the NC layer via N-functional groups to the HAP surface, where they bind to surface phosphate oxygens to form hydroxyls. As hydrogen supply outruns the slow furan ring saturation, these terminal hydroxyls accumulate to form the LHF. Electronic feedback from this localized field shifts the d-band center and lowers the work function of adjacent Ni sites. This electronic modulation drives substrate molecules into a parallel adsorption geometry at the interfacial active sites, strengthening reactant binding and facilitating activation. The optimized Ni/NC/HAP-0.25 catalyst achieves 99.9% furfural conversion at 40 °C with an apparent tetrahydrofurfuryl alcohol formation rate of 1936.3 mmol molmetal–1 h–1, outperforming Raney Ni by 21.3-fold, and works for diverse aromatic substrates. This study demonstrates that coupling rapid hydrogen supply to interfacial electronic modulation advances low-temperature hydrogenation on nonprecious metals.
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Nature Synthesis
·
2026
·
IF 22.6
Guan Siqi,Yu Tong,Tang Pei,Wu Huize,Wei Qian,Piao Nan,Li Lixiang,Zhu Jianqiu,Zhang Linjuan,An Baigang,Niu Yutao,Hu Guangjian,Sun Zhenhua,Wang Chunyang,Cheng Hui-Ming,Li Feng
Co-free Ni-rich layered oxide cathodes hold great promise for cost-effective, high-energy lithium-ion batteries, but their practical application remains limited by sluggish Li + kinetics and rapid capacity fading. Although doping has been widely used to mitigate these issues, conventional trial-and-error dopant selection remains inefficient for guiding rational materials development. Here we move beyond empirical dopant screening by developing a descriptor-informed multi-component dopant selection strategy based on dopant charge density and metal–oxygen bond strength. Low-charge-density dopants reduce electrostatic barriers to Li + migration, while high-bond-energy dopants reinforce the oxygen sublattice and stabilize the metal–oxygen framework. This doping strategy simultaneously accelerates Li + kinetics, suppresses cycling-induced phase transitions and mitigates chemomechanical fatigue, thereby delivering exceptional electrochemical performance in Co-free Ni-rich cathodes. The enhanced apparent Li + transport and structural stability enable an ultrahigh-rate capability of 130.9 mAh g −1 at 25 C and at 25 °C, excellent cycling retention of 82.4% after 350 cycles at 10 C and robust low-temperature operation delivering 112.2 mAh g −1 at 1 C under −20 °C. These findings, transitioning the design principle from empirical or trial-based selection to a targeted selection regime, present a promising route for developing high-performance cathode materials for lithium-ion batteries.
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