APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Jian-Wei Luo,Jian-Dong Song,Wen-Zhi Jia,Zhi-Ying Pu,Ji-Qing Lu,Meng-Fei Luo
Catalytic dehydrofluorination of 1,1,1,3,3-pentafluoropropane to 1,3,3,3-tetrafluoropropene was performed on a series of fluorinated NiO/Cr 2 O 3 catalysts. The NiO/Cr 2 O 3 catalysts were more active than the Cr 2 O 3 because the new acid sites provided by NiF 2 had higher turnover frequencies (9.43 × 10 −3 − 12.08 × 10 −3 s −1 ) than those on the Cr 2 O 3 (4.55 × 10 −3 s −1 ). Also, the NiO/Cr 2 O 3 was more stable than the Cr 2 O 3 due to its lower density of surface acid sites, which alleviated the coke deposition on the catalyst as evidenced by the Raman spectroscopic results. The kinetic results revealed that the15NiO/Cr 2 O 3 had much lower activation energy (63.6 ± 4.5 kJ mol −1 ) than the Cr 2 O 3 (127.6 ± 3.8 kJ mol −1 ). Accordingly, different reaction pathways on the two catalysts were proposed, which involved the cleavage of the C F and C H bonds on the surface acid and base sites, respectively.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2025
·
IF 7.7
Yujun Guo,Jiayi Qu,Zhenkai Zhang,Zhenyue Liu,Chen Yue,Qiuying Chen,Zhiguo Yang,Yang Mu,Xiaoning Wang,Davoud Dastan,Xi-Tao Yin,Xiaoguang Ma
In this paper, ZnS/NiO p-n heterojunction microspheres were fabricated via a two-step hydrothermal approach. The sensing properties of composites with different ZnS contents were investigated by regulating the ratio of Zn. When containing 25 mol% ZnS, the ZnS/NiO nanosphere sensor achieved a response of 125. The response was improved by a factor of about 83.3 compared to pure NiO. The sensor functions optimally at a temperature of 225 ℃, and it possesses excellent selectivity, a rapid response/recovery time (49/44 s), and long-term stability. Therefore, this paper provides a hydrothermal method to prepare ZnS/NiO nanocomposites with heterojunction, specifically designed to detect n-butanol. After performing a series of characterizations, it was determined that the enhancement of the gas-sensitive properties could be related to the construction of ZnS/NiO heterojunctions and the increase in oxygen vacancies.
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MATERIALS RESEARCH BULLETIN
·
2011
·
IF 2.146
Jinbo Zhao,Lili Wu,Ke Zou
The novel NiO hexagonal hollow microspheres have been successfully prepared by annealing Ni(OH) 2 , which was synthesized via an ionic liquid-assisted hydrothermal method. The samples were characterized by X-ray diffraction (XRD), field emission scanning electron microscope (FE-SEM), transmission electron microscopy (TEM), N 2 adsorption–desorption and Fourier transform infrared spectrometer (FTIR). The results show that the hollow NiO microstructures are self-organized by mesoporous cubic and hexagonal nanocrystals. The mesoporous structure possessed good thermal stability and high specific surface area ( ca. 83 m 2 /g). The ionic liquid 1-butyl-3methylimidazolium tetrafluoroborate ([Bmim][BF 4 ]) was found to play a key role in controlling the morphology of NiO microstructures during the hydrothermal process. The special hollow mesoporous architectures will have potential applications in many fields, such as catalysts, absorbents, sensors, drug-delivery carriers, acoustic insulators and supercapacitors.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Dongya Liu,Jinyue Wang,Yue Dong,Shaohan Xing,Xianchuang Liu,Xiuping Chen
Heterostructure engineering via the construction of Mott–Schottky (M–S) interfaces is a powerful strategy for designing advanced electrocatalysts. This study designs and synthesizes a NiO-Cr 2 O 3 M–S heterojunction for the efficient benzyl alcohol oxidation reaction (BAOR), which achieves a current density of 100 mA cm −2 at a low potential of 1.46 V (vs. RHE). Spectroscopic characterizations and theoretical calculations confirm the formation of an M–S junction, where a significant work function difference drives spontaneous electron transfer from NiO to Cr 2 O 3 , establishing a strong built-in electric field at the interface. This interfacial charge rearrangement fundamentally reshapes the electronic environment of the Ni active sites, enhancing the initial adsorption of reactants and upshifting the Ni d-band center. Such electronic modulation optimizes the binding strength of key intermediates and ultimately lowers the energy barrier for the rate-determining step (*Ph-CH 2 O→*Ph-CHO). The practical utility of the NiO-Cr 2 O 3 is demonstrated in a hybrid water electrolyzer, where it enabled substantial energy savings for H 2 production and the generation of benzoic acid. This work provides a clear validation of M–S heterojunction engineering as a powerful design principle for creating next-generation catalysts that synergize energy-efficient processes with value-added chemical synthesis.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Yiming Zhang,Yunpeng Zhang,Hongzhi Liu,Zhenggang An,Jiakai Hu,Xiaogang Hou,Peisen Li,Xusheng Wang
Suppressing photoinduced charge recombination represents a critical challenge in photocatalytic ammonia (NH 3 ) decomposition for hydrogen (H 2 ) production. Herein, we propose a dual-cocatalyst system comprising plasmonic silver (Ag) and nickel oxide (NiO), which synergistically construct an Ag → titanium dioxide (TiO 2 ) → NiO directional electron cascade on TiO 2 surfaces through work-function-induced interfacial charge transfer. The optimized 3 %Ag-1 %NiO-TiO 2 reaches a significantly photocatalytic H 2 production rate of 2366.9 μmol/h/g from NH 3 splitting, which is 20.7, 2.1 and 1.5 folds higher than that of pristine TiO 2 (114.4 μmol/h/g), 1 %NiO-TiO 2 (1146.7 μmol/h/g) and 3 %Ag-TiO 2 (1534.1 μmol/h/g), respectively. Photoelectric characterizations confirm accelerated charge separation and transfer dynamics through synergistic interplay of NiO and Ag cocatalysts on TiO 2 . Density functional theory (DFT) calculations reveal that work function gradient among TiO 2 , NiO and Ag facilitates unidirectional electron flow from Ag to NiO through the TiO 2 bridge. The optimal nickel (Ni) d-band center position and the reduced potential-determining step energy barrier for NH 3 splitting on 3 %Ag-1 %NiO-TiO 2 are further identified as key factors governing its outstanding H 2 evolution performance. This work establishes a rational dual-cocatalyst design with unidirectional electron flow to enable efficient photocatalytic H 2 production from NH 3 splitting.
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PubMed
高影响因子
Journal of Energy Storage
·
2025
·
IF 9.8
Chenglin Wei,Mengdi Sun,Baoguo Zhang,Zhangyong Yan,Zihao Dang,Yongkang Xu,Lin Wu,Ya Hu
Benefiting from the low cost and natural abundance of sulfur, as well as its excellent theoretical performance metrics - including a capacity of 1675 mAh g −1 and an energy density of 2600 Wh kg −1 - lithium-sulfur (Li-S) batteries have attracted considerable attention for next-generation energy storage. However, their practical deployment is severely hindered by the intrinsic shuttle effect of lithium polysulfides (LiPSs), which leads to the loss of active materials and poor cycling stability. In this work, we report a facile hydrothermal-calcination strategy to synthesize porous nanosheet-structured Fe-doped nickel oxide (Fe-NiO) as a functional separator modifier for Li-S batteries. The polar nature of NiO enables strong chemical interactions with LiPSs, effectively anchoring polysulfides on the cathode side and suppressing the shuttle effect. Furthermore, Fe doping significantly increases the density of surface active sites, thereby enhancing the adsorption and catalytic conversion of LiPSs into insoluble Li 2 S 2 /Li 2 S species, which promotes redox kinetics and mitigates capacity fading. When applied to Li-S cells, the Fe-NiO-modified separator markedly improves the electrochemical performance, delivering a high reversible capacity of 1150 mAh g −1 at 0.2C, an excellent rate capability of 505 mAh g −1 at 5C, and outstanding long-term stability with a minimal capacity decay of 0.091 % per cycle over 500 cycles at 1C. This study presents a simple and scalable strategy for separator engineering, providing a promising pathway toward high-performance Li-S batteries.
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Physica Status Solidi-Rapid Research Letters
·
2025
·
IF 2
Yi Chen,Cong Liu,Ruixue Sun,Guojie Yin,MR. Manikandan,Yifan Lv,Jingyu Shi,Yu Hao,Rui Liu,Yanchun Hu,Shaoqian Yin,Xianwei Wang
In this study, we investigate the effect of varying tannic acid (TA) concentrations on the electrochemicalperformance of NiCo-MOF-derived nanocomposite electrode materials. The TA@NiO@NiCo 2 O 4 nanocomposites were synthesized using a straightforward metal–organic framework (MOF) templating strategy, which involved a simple hydrothermal method followed by a two-step annealing process. Electrochemical characterization reveals that the resulting nanocomposites exhibit excellent cycling stability. Among them, the sample treated with 0.02 mol L −1 TA achieves the highest specific capacitance, reaching 773 F g −1 at a current density of 1 A g −1 . Furthermore, the nanocomposites display reduced electrical impedance, with the 0.02 mol L −1 TA sample recording a series resistance (Rs) as low as 0.60 Ω. After 5000 galvanostatic charge–discharge cycles, the capacity retention of samples treated with TA concentrations of 0, 0.01, and 0.02 mol L −1 all exceed 100%, indicating remarkable electrochemical durability.
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ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Shuyan Guan,Lulu An,Yumei Chen,Xianyun Liu,Jianchao Shi,Yulong Sun,Yanping Fan,Baozhong Liu
Highly active and stable non-noble metal catalysts are expected to play a critical role in future hydrogen storage and conversion applications. The design of active sites with composite oxides provides a new approach for developing high-performance catalysts. In this study, an Fe-doped Ni/NiO nanocomposite film was constructed on an ionic liquid/water interface to promote hydrogen generation. The optimized Ni/FeNiOx-25 catalyst showed excellent catalytic activity toward ammonia borane hydrolysis, with a turnover frequency of 72.3 min–1. The enhancing effect of Fe2+ doping on Ni/NiO films was confirmed by the improved intrinsic activity and theoretical simulations. Fe ion doping stabilized NiO and prevented NiO from becoming Ni. The interfacial Ni–Fe2+ dual active sites on the FeNiOx and Ni interfaces participated in the targeted adsorption and effective activation of water and NH3BH3 molecules, respectively. The sufficiently exposed plane surface of the nanofilms provided abundant active sites for catalytic reactions. This significant advance will inspire development in the ambient liquid hydrogen storage field.
研究领域:
材料科学
·
催化化学
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2026
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IF 6.7
Liru Zeng,Zeyulin Zhang,Dinghe Liu,Zhuangjie Xu,Dazheng Chen,Yue Peng,Qian Feng,Yachao Zhang,Jincheng Zhang,Chunfu Zhang,Yue Hao
The interfacial configuration in oxide heteroepitaxy plays a critical role in determining the structural integrity and reliable performance of wide-bandgap heterostructures. Herein, we investigate the orientation-dependent epitaxial growth of high-quality NiO films on β-Ga 2 O 3 via mist chemical vapor deposition (Mist-CVD), exhibiting distinct epitaxial domain configurations depending on the substrate orientation. Combined experimental and density functional theory (DFT) analyses reveal that the synergistic interplay among surface energy, lattice mismatch, and crystal symmetry governs the epitaxial mode and crystalline quality across different substrate orientations. Benefiting from the high-quality epitaxy, the NiO films demonstrate good environmental stability, retaining 94% of their initial current after 30 days of ambient exposure. As a functional demonstration, the NiO/(001) β-Ga 2 O 3 p-n diode exhibits a low leakage current density (2.08 ×10 −8 A·cm −2 @-100 V) and a high breakdown voltage of 885 V, highlighting the critical role of epitaxial interface quality. This study provides mechanistic insight into orientation-regulated oxide heteroepitaxy and offers a viable materials strategy for constructing stable wide-bandgap oxide heterostructures.
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Inorganic Chemistry Frontiers
·
2026
·
IF 6.2
Xiaowen Zhang,Qi Lei,Lixiang Wang,Qingge Feng,Qihua Liang
Xylene poses a threat to environmental and public health due to its neurotoxicity and strong irritancy, necessitating the development of efficient trace detection technologies. However, existing metal oxide semiconductor-based xylene sensors tend to have drawbacks such as high detection limits, insufficient response, poor humidity resistance, and susceptibility to cross-interference from aromatic compounds. In this study, Mo-doped nickel oxide nanofibers with varying doping ratios were fabricated by combining a facile electrospinning process with thermal treatment, and their gas-sensing properties were systematically evaluated. The results demonstrate that the sensor with a Mo doping concentration of 12.5 at% exhibited the maximum response to 20 ppm xylene at 265 °C (S ≈ 120.9), an ultra-low detection limit of 20 ppb, excellent selectivity, outstanding humidity resistance, and long-term stability. The improvement in sensing performance primarily stems from the modulation of valence state distribution in nickel oxide by aliovalent molybdenum doping. This process improves charge transfer efficiency and increases oxygen vacancy concentration. Additionally, the incorporation of Mo significantly enlarges the specific surface area and increases the quantity of micropores and mesopores. These factors collectively optimize the activity of surface chemisorbed oxygen, thereby markedly improving gas-sensing reaction efficiency. In situ Fourier transform infrared analysis reveals the surface oxidation reaction process and final reaction products of xylene. This work provides a feasible material strategy for developing high-performance xylene gas sensors, demonstrating promising potential for applications in trace xylene detection.
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Chemical Engineering and Processing-Process Intensification
·
2026
·
IF 3.9
JIANG Xi,PANG Yunji,ZHANG Tiejun
This study prepared a biochar-supported nickel oxide (NiO/BC) catalyst for the microwave-catalyzed degradation of gaseous phenol, aiming to investigate the degradation mechanism and pathway regulation. By optimizing preparation and reaction parameters, it was found that at a Ni loading of 6 wt% and a microwave power of 480 W, the gas-phase products accounted for 98.6% of the total products, with optimal selectivity for H₂ and CO in the syngas. Characterization results indicated that NiO was in-situ reduced to metallic Ni nanoparticles during the reaction, forming the key catalytically active centers that synergistically catalyzed cracking and hydrogenation reactions. This process primarily converted phenol into syngas (H₂ + CO) and long-chain alkanes (tetradecane). The study further revealed that excessively high microwave power caused the sintering of Ni particles, resulting in catalyst deactivation. This research elucidates the dynamic evolution of the catalyst under microwave irradiation and the directed conversion mechanism of phenol, providing a scientific basis for developing efficient and stable microwave-catalyzed technologies for the resource treatment of organic pollutants.
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RSC Advances
·
2015
·Vol. 5
·期 112
·92128-92133
·
IF 3.84
Chaoxin Yuan,Hairong Li,Longzhen Xie,Fang Wang,Heng Deng,Fangzhi Chang,Yongzhe Sun
Nickel oxide (NiO) flower-like hierarchical nanostructures were obtained by electrodeposition and oxidation methods. The surface morphology and structure of the fabricated NiO were examined by scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray diffraction (XRD). The gas sensing characteristics toward toluene gas are investigated. The sensors based on this nanostructures exhibit a high response to 5 parts-per-million (ppm) of toluene (ratio of resistance to gas and air = 2.63) under an operating temperature of 250 °C. Furthermore, the response and recovery time to 2 ppm can reach 13.6 s and 24.5 s, respectively. The results indicate that the flower-like nanostructure is a potential candidate for gas sensors with good performances for practical applications.
研究领域:
材料科学
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纳米技术
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气体传感器
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环境监测
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