CATALYSIS LETTERS
·
2024
·Vol. 154
·期 8
·4088-4095
·
IF 2.3
Li Ling,Yan Shasha,Wang Hui,Ge Xingbo
The oxygen evolution reaction (OER) plays a vital role in electrolytic water splitting. It is urgent to explore highly active non-precious metal OER catalysts. Herein, the etching combined with the electrodeposition was used to synthesize the efficient Ni–Fe/p-CoAl catalyst, which exhibits ideal OER performance. A low overpotential of 282 mV and 296 mV are needed to achieve the current density of 50 mA/cm 2 and 100 mA/cm 2 in 1 M KOH, respectively. Moreover, the as-prepared catalyst shows good durability with no detectable degradation during long-term operation. The enhanced OER performance can be attributed to the large electrochemical surface area and the strong interaction between Ni–Fe nanosheets and active substrate. Graphical Abstract Etching combined with the electrodeposition method was used to synthesize an efficient Ni–Fe/p-CoAl catalyst for OER.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Song Cheng,Yutao Liu,Xinyi Liu,Changqing Zhu,Jingyang Luo,Jiashun Cao,Fuqiang Liu
Electro-assisted activation of peroxymonosulfate (EA-PMS) by transition metals oxides (TMOs) has been extensively studied for the removal of organic pollutants. Despite TMOs possess considerable activity and affinity to PMS, their poor bulk conductivity still limits the electron exchange during the TM δ/δ+1 redox cycle, especially the efficient reduction of TM δ+1 via cathodic process. In this study, carbon felt loaded with modified Co 3 O 4 nanosheets (Co@FCF) was fabricated and applied as the flow-through electrode of EA-PMS process, where the Co 3 O 4 nanosheets were embedded with numerous metallic Ni particles encapsulated within carbon layers (Ni@C). Driven by weak electric current, continuous electrons can be supplied to the bulk Co 3 O 4 from the electron-rich Ni@C nanoparticles, resulting in accelerated Co 3+ /Co 2+ cycle, enhanced production of SO 4 ·− and improved energy utilization efficiency. Electrochemical tests along with density functional theory calculations indicate that the unique structure of Co@FCF played essential role in the enhanced performance.
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RENEWABLE ENERGY
·
2020
·
IF 6.274
Yunwu Zheng,Jida Wang,Can Liu,Yi Lu,Xu Lin,Wenbin Li,Zhifeng Zheng
To eliminate the problematic need for liquid phase, high temperature, and high pressure, as well as the excessive consumption of hydrogen and production of aromatic hydrocarbons, associated with traditional aviation oil preparation processes, Ni–Cu bimetallic catalysts were synthesized and evaluated for ex situ catalytic pyrolysis vapor upgrading of oleic acid under a N 2 atmosphere. The effects of catalyst support (AC, Al 2 O 3 , ZrO 2 , HZSM-5, HUSY, Hβ and MCM-41), pyrolysis process parameters (pyrolysis temperature, catalytic temperature and amount of oleic acid injected), and the mixing ratio of modified metals (Ni:Cu = 0:1,2,1:1,1:2,1:0) on the catalytic conversion of oleic acid to high-quality chemicals were studied. The catalysts were characterized by XRD , BET and NH 3 -TPD. Modified bimetallic catalysts show great potential for green diesel production without the use of H 2 feed. The abundance of Brønsted acid sites favors HDO routes (such as HZSM-5, HUSY, Hβ and MCM-41), while Lewis acid sites (such as ZrO 2 and Al 2 O 3 ) favor hydrogenation and decarbonylation reactions. The addition of Cu enhances the reducibility of Ni and inhibits the cracking reaction and deactivation caused by coke. The addition of Ni effectively promotes the conversion of oleic acid, accelerates the fracture of C–C and effectively improves the production of hydrocarbons. The highest conversion was 100% with 85.68% selectivity towards hydrocarbons under pyrolysis at 450 °C, a catalytic temperature of 500 °C, and a feed quantity of oleic acid of 0.25 ml/min using Ni–2Cu/MCM-41 catalysts, and the oxygen removal efficiency and selectivity of C17 hydrocarbon were the highest (85.68% and 26.77%, respectively). The main products were olefins . In addition, the regenerated catalyst had good stability and could be used for at least 3 reaction cycles without observation of significant deactivation.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
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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