JOURNAL OF MATERIALS SCIENCE
·
2025
·
IF 3.9
Chen Boyang,Liu Xinyu,Liu Yiyuan,Gao Zeliang,Zhang Kun,Mu Wenxiang
Semiconductor X-ray detectors have attracted considerable attention recently owing to their high sensitivity and excellent stability. Among them, semi-insulating β-Ga 2 O 3 stands out due to its superior thermal stability, high breakdown electric field, and high crystal quality, enabling the fabrication of high-performance detectors suitable for various working environments. In this study, Ni 2+ was introduced into β-Ga 2 O 3 as a deep-level acceptor via doping engineering. A high-resistivity Ni-doped β-Ga 2 O 3 crystal was grown using the edge-defined film-fed growth (EFG) method. X-ray fluorescence spectrometer (XRF) confirmed a Ni doping concentration of 0.544 at%. The crystal exhibited a rocking curve with a full width at half maximum (FWHM) of 65.13 arcsec and clear, symmetric Laue patterns. The ultraviolet–visible (UV–Vis) transmission spectrum showed a cutoff edge at 265.5 nm, yielding a bandgap of 4.67 eV. Moreover, the semi-insulating behavior of Ni: β-Ga 2 O 3 was indicated by the infrared absorption edge extended beyond 10 μm. Raman spectroscopy revealed lattice distortion due to Ni 2+ incorporation, causing shifts in peak positions and intensities without phase change. A metal–semiconductor–metal (MSM)-structured X-ray detector based on Ni: β-Ga 2 O 3 was fabricated and characterized under various biases and dose rates. The device exhibited excellent stability at 1000 V with a high sensitivity of 663.36 μC/Gy·cm 2 , outperforming detectors from other semi-insulating β-Ga 2 O 3 crystals due to its superior crystal quality and high breakdown strength. Furthermore, low oxygen vacancy concentration contributed to fast response times of 0.20 s (rise) and 0.23 s (fall). The detection limit was estimated to be 12.04 nGy/s, highlighting its potential for low-dose X-ray detection.
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高影响因子
Small
·
2025
·Vol. 21
·期 11
·2411320
·
IF 12.1
Yunbo Li,Yan Jin,Lingyi Ding,Yucheng Zhu,Hongyan Zhou,Qinghua Fan,Youzhong Dong,Quan Kuang,Yanming Zhao
Mn metal has become a highly promising candidate anode of aqueous batteries due to its high abundance, non-toxicity, relatively low redox potential, and large theoretical capacity. However, the development of Mn ion batteries (MIBs) is hindered by controversies over reaction mechanisms, metal hydrogen evolution reactions, and poor conversion efficiency. Therefore, a further comprehensive study is urgently desired for its research and application. In this work, a V 2 O 5 bilayer structure is innovatively constructed by introducing stripping agents (H 2 O and Ni 2+ ) to form stable “Ni─O” columns, which not only enhances the stability of the structure but also effectively blocks interlayer corrosion. The preferential orientation and the excellent interlayer spacing d (001) = 10.28 Å broads Mn 2+ diffusion channels. In this way, the sites for ion storage are also increased by creating abundant vacancies, accelerating the diffusion rate of ions in the modified V 2 O 5 (Ni 0.48 V 2 O 5 •0.90H 2 O, NiVO) lattice. The co-storage mechanism of Mn 2+ /H + ions effectively alleviates the limitations of high charge density and large solvation ion radius. Furthermore, the storage mechanism and structural evolution process are investigated via analytical chemistry. These findings provide new ideas for designing new positive electrode materials and effectively promote the progress of the MIB research and application.
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PubMed
高影响因子
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
·
2025
·
IF 2
Lu Shuai,Huang Kang,Sun Xiaowei,Xue Wei,Zhang Zequn,Zhang Bowei,Wu Junsheng
The stability of the gas film in the cathode plasma electrolytic deposition (CPED) process is essential for producing high-quality coatings. In this work, cationic cetyltrimethylammonium bromide (CTAB), anionic sodium dodecyl sulfate (SDS), and nonionic polyvinylpyrrolidone (PVP) surfactants were added to the electrolyte to regulate the gas film. Force balance analysis of individual bubbles demonstrated that surfactants effectively reduced surface tension, resulting in thinner gas films and lower energy consumption. With 3 g/L of CTAB, SDS, and PVP, energy consumption was reduced by 67.21%, 60.97%, and 73.58%, respectively. Based on the polarity and electrostatic interactions of the surfactants, the mechanisms by which the three surfactants affect gas film uniformity and the deposition process were revealed. CTAB reduced gas film uniformity due to the attraction of opposite charges, leading to cross-sectional defects. In contrast, SDS improved gas film uniformity through the repulsion of negative charges, reducing coating roughness and increased thickness. PVP exhibited intermediate effects, producing dense coatings with slightly lower thickness. This work provides a new perspective for regulating the CPED process and lays the groundwork for exploring alternative methods to stabilize CPED operations.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2025
·Vol. 60
·期 21
·8720-8733
·
IF 3.9
Zhang Wen-hua,Yi Bing,He Wen-xin,Ma Xiu-jia,Jia Yun-bo,Li Shi-qi,Guo Cai-wen,Wang Xue-wei
Industrial catalysts for the oxygen evolution reaction (OER) of water electrolysis are key to realizing green and clean hydrogen production. In this study, multivariate transition metal hydroxide catalysts with high-entropy structure were prepared, which exhibited optimized electrocatalytic performance and stability for water splitting in alkaline media. Using copper foam as the substrate, samples are obtained through the step-by-step combination and tuning of the multi-components. The electrochemical performance test results show that the optimized FeCoCuMoMnOOH catalyst exhibits an exceptional catalytic effect for the OER with an overpotential of 227 mV at a current density of 100 mA/cm 2 , much superior to the performance of FeCoCuOOH and FeCoCuMoOOH. In the 30-h timed current method test, the performance of the FeCoCuMoMnOOH catalyst is essentially non-decaying and shows good stability. The XPS results indicate that the metal components are stably combined to exist as a mixture of metal phases in the samples, which exerts a beneficial synergistic effect and offers more active sites. Meanwhile, Mn as an electron donor can increase the electron density and optimize the electron transport structure, which is conducive to the electrochemical reaction rate. This work sheds light on presenting an effective strategy for constructing multi-element high-entropy combinations with modulated component ratios, which provides a new idea for designing efficient and stable transition metal hydroxyl oxide catalysts. Graphical abstract
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高影响因子
FUEL
·
2025
·
IF 7.5
Yun Huang,Peipei Zhao,Kai Cui,Junwen Chen,Peng Wu,Xiaohong Li
The catalytic conversion of biomass-derived furfural and its derivatives such as furfuryl alcohol (FFA) into high value-added chemicals has been the subject of considerable attention within the field of biomass refining. Nevertheless, the selective hydrogenolysis of FFA represents a significant challenge to obtain the goal product such as 1,2-pentanediol (1,2-PeD) or 1,5-pentanediol (1,5-PeD) with satisfactory yield, due to complicated network involved in the FFA hydrogenolysis. Hence, selectivity control is the key to the hydrogenolysis of FFA. In this work, a 45Ni-Pr (45 wt% Ni/PrO x ) catalyst prepared using a facile sol–gel method behaved very well in the hydrogenolysis of FFA, resulting in up to 86.3 % yield of 1,5-PeD under mild reaction conditions. Introduction of PrO x enhanced Ni dispersion and promoted intimate contact between Ni species and PrO x . This created weak and medium-strong basicity and oxygen vacancies on the catalyst surface, which facilitated the adsorption of FFA via the C-O-C bond on the furan ring and C-OH at the side chain. Moreover, the 45Ni-Pr catalyst had the balanced Ni 0 and Ni 2+ sites, which guarantee not only the saturation of the C=C bond on the furan ring in the presence of Ni 0 sites to yield the intermediate tetrahydrofurfuryl alcohol (THFA), but also the subsequent ring-opening hydrogenolysis of THFA at the Ni 0 -O V -Ni 2+ -PrO x interfacial sites to produce 1,5-PeD selectively. This work establishes a viable and environmental benign approach for producing 1,5-PeD from the bio-based furfural derivatives, as well as a reference for the selective ring-opening hydrogenolysis of furan compounds.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Di Wang,Yingying Zhu,Jinze Li,Wensheng Yang,Yulin Zhao,Geng Chen
Carbon nitride (g-C 3 N 4 ) photocatalysts face significant challenges in environmental water remediation, including limited visible light absorption, severe charge recombination, and slow charge transfer. To address these limitations, we developed a Z-scheme Ni-C 3 N 4 /P-C 3 N 4 heterojunction using an efficient and environmentally friendly ball milling method. Compared to g-C 3 N 4 , P-C 3 N 4 , and Ni-C 3 N 4 , the Ni-C 3 N 4 /P-C 3 N 4 heterojunction demonstrated significantly enhanced photocatalytic activity, achieving 99.1% and 86.8% degradation of tetracycline (TC) and rhodamine B (RhB) within 60 minutes, respectively. The total organic carbon (TOC) removal efficiencies were 78.2% for TC and 71.8% for RhB. This enhanced activity is attributed to the optimized heterojunction components and the tightly coupled heterojunction interface, which improve charge transfer and promote efficient separation of photogenerated carriers. Radical scavenging experiments and electron spin resonance (ESR) analysis revealed that holes (h⁺), hydroxyl radicals (·OH), and superoxide radicals (·O 2 − ) all synergistically contribute to the degradation process, with ·O 2 − being the dominant active species. Additionally, toxicity assessment of the degradation products confirmed the environmental safety of the photocatalytic process. This study provides a promising strategy for photocatalytic water purification and offers valuable insights into the design of heterojunction materials.
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高影响因子
ACS Catalysis
·
2024
·
IF 11.3
Xing Li,Lei Xing,Guoxiong Zhan,Zhoulan Huang,Zhen Chen,Huazhen Chang,Junhua Li
Catalytic carbamate decomposition is a feasible option for reducing the heat duty of amine solvent regeneration during the chemisorption of CO2 capture; advanced material with excellent proton transfer and exchange performance is crucial to boost the decomposition kinetics in an alkaline environment. Here, we prepared magnetic heterostructure Ni/NiO nanocatalysts with tunable Ni(0) nanoparticles and NiO support. The heterointerface of the proposed materials creates abundant surface oxygen vacancies (OVs) and offers abundant reactive active sites ascribed to the special electron transfer scheme of Ni0–NiO. The generated surface hydroxyls and unsaturated coordinated Ni, respectively, provide transferable protons and electrons, involved in the deprotonation of RNH3+ and C–N break of RNHCOO–. Thus, the obtained nanomaterials achieved considerably improved CO2 desorption of up to 3 mmol/min for a CO2-saturated monoethanolamine solvent, representing a substantial (approximately 50%) increase over the catalyst-free case. The reinforcement mechanism of OV generation by the Ni/NiO heterostructure and the induced proton transfer were revealed through in situ spectroscopic measurement and theoretical calculations. The results verified that the OVs stimulate the production of surface hydroxyls and water-assisted proton hopping, providing an advantageous condition for carbamate decomposition.
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Surfaces and Interfaces
·
2025
·
IF 6.3
Jiangang Kang,Haihong Zhang,Yuehui He,Liang Wu,Hengdi Ye,Jinchao Wei
The novel Ni-Si intermetallic compounds are fabricated by elemental powder metallurgy. This study explores the synthesis of a series of catalysts (Ni-Si-M, M=Co, Fe, Mn) by alloying to augment the low-temperature efficiency of CO oxidation using Ni-Si intermetallic compounds. It is found the low-temperature catalytic activity of Ni-Si-Co, Ni-Si-Fe, and Ni-Si-Mn catalysts are significantly enhanced compared to the original Ni-Si. The catalytic activity among the catalysts ranks as follows: Ni-Si-Co > Ni-Si-Fe > Ni-Si-Mn > Ni-Si. The apparent activation energy (Ea) for Ni-Si-Co was the lowest at 57.3 kJ/mol, suggesting its efficient catalytic oxidation of CO. Additionally, the addition of Co, Fe and Mn elements actually promotes the generation of Ni 2+ as the CO adsorption site in the original Ni-Si. The addition of Co element also leads to the formation of Co 2+ as the adsorption site of O 2 in the process of CO oxidation reaction. The synergistic adsorption of Ni 2+ and Co 2+ to CO and O 2 promotes the CO oxidation reaction. Additionally, the catalysts demonstrate robust long-term stability in atmospheres containing H 2 O and SO 2 , with CO conversion initially suppressed but subsequently recovering and stabilizing at over 90%. This investigation offers novel insights into enhancing the low-temperature activity and stability of catalysts.
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高影响因子
LANGMUIR
·
2025
·
IF 3.9
Zhigao Ma,Ziwen Wei,Bingyan Jiang,Lu Zhang
The electrodeposition of Ni–P–PTFE nanocomposites offers an effective approach to reduce mold–polymer interface adhesion and improve the replication of polymer micro features in injection molding. However, it is still challenging to fabricate Ni–P–PTFE nanocomposites with low internal stress and nanoscale surface roughness in electrolytes containing high PTFE concentrations. In this study, cetyltrimethylammonium bromide was introduced into the electrolytes to achieve a good dispersion of PTFE nanoparticles. Ni–P–PTFE nanocomposites with various compositions were successfully electrodeposited, and their tribological properties were analyzed. The electroformed Ni–P–PTFE nanocomposites with high PTFE and phosphorus contents showed a low surface roughness and surface energy compared to nickel electrodeposits. Ni–P–PTFE nanocomposites also exhibited a low coefficient of friction (COF) and wear loss when electroformed from an electrolyte containing 32 g/L phosphorus acid and 5 g/L PTFE nanoparticle. The COF of Ni–P–PTFE against stainless steel and poly(methyl methacrylate) was 0.2 and 0.12, respectively, representing a decrease of 80% and 85% compared to nickel electrodeposits. These enhancements in self-lubricating performances were primarily attributed to the low surface roughness and a shift in wear modes from adhesive wear to predominantly mild abrasive wear.
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高影响因子
CERAMICS INTERNATIONAL
·
2025
·Vol. 51
·期 25
·45661-45668
·
IF 5.6
Yuyu Liu,Fan Zhang,Rui Zhu,Weijin Chen,Yue Zheng
It is well known that doping can significantly affect the dielectric and eletromechanical properties of perovskite ferroelectrics like BaTiO 3 . However, the influence of transition group element doping on the flexoelectric property of BaTiO 3 -based ceramics remains poorly studied. Here, we made a comparative investigation on the flexoelectric property of BaTiO 3 -based ceramics doped by transition group elements V, Mn and Ni. The phase composition, crystal structure, and average grain size of the ceramics were determined using X-ray diffraction refinement and scanning electron microscopy. It shows that the samples all exhibit dense and uniform microstructures with clear grain boundaries, but they have different average grain sizes ranging from 15 to 59 μm. Ceramics with larger average grain sizes exhibit higher dielectric constants and Curie temperatures. While the flexoelectric coefficient of Ni-doped, V-doped and pure BaTiO 3 ceramics varies from 15.36 μC/m to 60.37 μC/m, showing positive correlation with average grain sizes, that of the Mn doped BaTiO 3 ceramic which has the largest average grain size (59 μm) is rather small (19.01 μC/m). We suggest that the increased conductivity of ceramics suppresses the flexoelectric effect. The factors determining the flexoelectric coefficient of BaTiO 3 based ceramics doped by transition group elements should include electrical conductivity in addition to dielectric constant which is further affected by grain size. Our work gains new insight into the flexoelectric effect in perovskite oxide ceramics.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2025
·
IF 8.3
Jianwei Gao,Xiaoqing Si,Mingshen Li,Pengpeng Xue,Bo Yang,Chun Li,Junlei Qi,Jian Cao
Microwave-sintered Ni-doped Mn–Co spinel coatings were developed as advanced protective layers for solid oxide fuel cell (SOFC) interconnects. By systematically varying the Ni content (in MnCo 2-x Ni x O 4 , x = 0–0.5), we demonstrate that Ni incorporation significantly alters cation valence distributions and oxygen vacancy concentrations, leading to a substantial reduction in the thickness of Cr-containing oxide layers compared to undoped coatings. Among the compositions studied, the MnCo 1.7 Ni 0.3 O 4 coating exhibited the best performance, maintaining an area-specific resistance (ASR) below 20 mΩ cm 2 after 500 h at 800 °C, indicating excellent electrical conductivity and long-term stability. Crystal field analysis revealed that Ni doping not only suppresses the Jahn-Teller distortion of Mn 3+ but also enhances configurational entropy, thereby stabilizing the spinel structure against Cr diffusion. These findings establish entropy engineering via Ni substitution as a viable strategy for designing thermodynamically robust, electrically conductive, and Cr-resistant coatings, offering a promising pathway for durable SOFC interconnect applications.
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高影响因子
FUEL
·
2023
·
IF 7.4
Zhichao Yu,Xin Liu,Yang Liu,Yuan Li,Zhuohan Zhang,Kangli Chen,Shumin Han
Multiple catalysts have exhibited high activity on improving the hydrogen storage performance of MgH 2 . Herein, the hydrogen ab/desorption kinetics of MgH 2 is significantly improved by using Ni@C@CeO 2 as the catalyst. The results show that 10 wt%-Ni@C@CeO 2 doped MgH 2 can absorb 4.51 wt% hydrogen within 60 min under low temperature 75 °C. Furthermore, the MgH 2 -Ni@C@CeO 2 composites release approximately 4.88 wt% H 2 within 10 min at 325 °C. Moreover, the composites show excellent cycling performance, with negligible decrease in hydrogen storage capacity, hydrogen uptake rate and hydrogen release rate after ten cycles at 350 °C. The Rietveld refinement of X-ray diffraction and transmittance electron microscopy measurements reveal that Mg 2 NiH 4 /Mg 2 Ni and CeH 2.73 phases are in-situ formed. The mutual conversion of “Mg 2 Ni/Mg 2 NiH 4 ” during hydrogen ab/desorption is a well-known “hydrogen pump” effect, which improvs the hydrogen storage performance of MgH 2 . The presence of CeH 2.73 accelerate the conversion of Mg 2 Ni/Mg 2 NiH 4 , which we call ‘facilitated hydrogen pump’ effect. This attempt paves a potential way to achieve high performance Mg-based composites hydrogen storage materials via collaborative action between Ni and Ce species.
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