Friction
·
2024
·Vol. 12
·期 9
·1991-2003
·
IF 6.3
Ao Dong,Fan Xiaoqiang,Zhu Minhao
Efficient cooperative lubrication can be achieved via the introduction of core-shell structure lubricant additives with hard core and soft shell, for obtaining the expected anti-wear performance from the structural changes in the friction process. In this study, C@Ag microspheres with a core-shell structure were prepared by the redox method with carbon spheres as the core and Ag nanoparticles as the shell. Their tribological behaviors as base oil (G1830) additive with different concentrations were investigated in detail. Compared with base oil, the addition of C@Ag particles at 0.5 wt% can reduce the coefficient of friction (COF) and wear volume (Wv) up to 15.5% and 88%, respectively. More importantly, C@Ag particles provide superior lubrication performance to single additive (like carbon sphere (CS) and Ag nanoparticle). C@Ag core-shell particles contribute to the formation of tribo-film by melt bonding of flexible Ag and carbon sphere (CS) toward excellent self-repair performance and high-efficiency lubrication. Hence, core-shell structural nanoparticles with hard-core and soft-shell hold bright future for high-performance lubrication application.
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JOURNAL OF APPLIED PHYSICS
·
2024
·Vol. 135
·期 16
·
IF 2.7
Zhao Dongpeng,Li Jun,Bai Han,Wu Huantong,Chen Xiping,Sun Guangai,Zhou Zhongxiang
Consistent c -axis orientation characteristics toward the direction of applied pressure of Y -type BaSrCo 2 Fe 11 AlO 22 (BSCFAO- θ ) were successfully prepared by the strategy of hot pressing. The samples’ magnetoelectric coupling performance was greatly enhanced by the strategy of hot pressing than that of the traditional solid reaction method. The magnetoelectric current of BSCFAO- θ ( θ = 0°) (12.06 μ A/m 2 ) was nearly 5 times higher than BSCFAO- SS (2.24 μ A/m 2 ). The magnetoelectric polarization of BSCFAO- θ ( θ = 0°) (32.82 μ C/m 2 ) was nearly 4 times higher than that of BSCFAO- SS (8.31 μ C/m 2 ). The magnetoelectric coupling coefficients of BSCFAO- θ ( θ = 0°) (1880 ps/m) were nearly 4 times higher than those of BSCFAO- SS (404 ps/m). The enhancement of magnetoelectric polarization of BSCFAO- θ ( θ = 0°) can be attributed to the uniform c -axis orientation, which reinforced magnetoelectric polarization compared with none orientation that eliminated the magnetoelectric polarization on grain boundaries. The magnetoelectric coupling performance of BSCFAO- θ presented a gradually decreasing trend with the angle changing from 0° to 90° for the changing of orientation. Compared with traditional solid reaction methods, the strategy of hot pressing inhibits grain growth and increases grain boundaries, thus facilitating the enhancement of grain boundaries’ resistivity, and the electrical resistivity of BSCFAO- θ (3.08 × 10 10 Ω cm) was nearly 10 000 times higher than that of BSCFAO- SS (2.5 × 10 6 Ω cm), which also benefits the magnetoelectric polarization performance of BSCFAO- θ . Therefore, the hot-pressing strategy can contribute to the forming of oriented ceramics and enhance the grain boundaries’ resistivity to improve magnetoelectric coupling performance.
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JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2017
·Vol. 164
·期 13
·A3303
·
IF 3.259
Qianqing Zhao,Mingqi Li
To develop high-capacity and low-cost carbon material, a novel high-content N, O-codoped C anode material is synthesized using melamine and glucose as starting materials. The as-prepared sample is composed of hierarchical meso-macroporous carbon bulks and graphene-like carbon sheets with 23.5 wt% N and 13.8 wt% O. The high-content N, O-codoped C exhibits high lithium storage capacity, long cycle life and excellent rate capability. At 200 mA g−1 over a voltage window of 0–3.0 V at 25°C, a discharge of about 670 mAh g−1 can be obtained after 500 cycles. Even at 1600 mA g−1, the high-content N, O-codoped C still exhibits a stable discharge capacity of 330 mAh g−1. Compared with the O-doped C and non-doped C materials, the high-content N, O-codoped C shows significant advantages in lithium storage performance, which are attributed to its high surface area, abundant porosity, graphene-like structure and rich heteroatom doping. With the rise of temperature, the lithium storage capacity of the high-content N, O-codoped C increases. With the decrease of delithation cutoff voltage, the reversible capacity of the high-content N, O-codoped C decreases. When assembled a full cell with the LiNi0.5Co0.2Mn0.3O2 cathode, a relatively stable cycling performance can be obtained.
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INORGANIC CHEMISTRY COMMUNICATIONS
·
2024
·
IF 4.4
Diwei Deng,Ping Ma,Xianliang Li,Xiaoyu Chen,Yan Xu
Metal oxide heterostructures have been demonstrated excellent candidates acting as novel gas sensors with outstanding sensitivity and selectivity . In this work, a hierarchical NiGa 2 O 4 @C@CeO 2 heterostructure with corn-like NiGa 2 O 4 microcrystals covered by a thin carbon layer and then anchored with numerous amounts of external CeO 2 nanoparticles was prepared through the combination of hydrothermal and a subsequent calcination method. The NiGa 2 O 4 @C@CeO 2 composite demonstrates an excellent selective triethylamine (TEA) detection performance with a response of 11.1 towards 20 ppm TEA and a fast response/recovery time of 81 s/38 s. It also shows terrific selectivity for TEA when mixed with else interfering substances, along with prolonged reusability for at least 15 days. The enhanced TEA sensing performance can be ascribed to the significant improvement of conductivity and effective carrier transfer at the interface. This work provides a feasible method to fabricate metal oxide sensors with improved gas sensing performance.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Liwen Wang,Guanghui Zhang,Nan An,Ruxin Li,Chang Zhou,Wenjuan Huang,Junyuan Duan,Xiangbai Chen
Hollow structure can provide more active sites and gas transmission channels for gas molecules due to their significant surface area and unique structure, showing significant performance in the field of gas sensing. Here, hollow single-shell porous C-doped Co 3 O 4 polyhedrons are successfully prepared by high temperature calcination using Co-MOF/g-C 3 N 4 precursors through a simple wet chemical method. The results show that the doping of carbon element promotes the formation of single-shell hollow porous structure. The performance test shows that the single-shell hollow porous C-doped Co 3 O 4 polyhedrons structure exhibits high sensitivity (42.41-100 ppm), low detection limit (1 ppm) and excellent selectivity to xylene at 140 ℃. The improved detection performance of the C-doped Co 3 O 4 sensor for xylene is attributed to the hollow single-shell porous structure that increases the gas adsorption area, and the incorporation of carbon atoms regulates the electronic and chemical properties of the material. This process enhances the specific surface area of material, providing more active sites for the reaction process and exhibiting stronger catalytic activity towards xylene. This study proposes a unique method to construct hollow single-shell porous structure.
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Nano Research
·
2024
·
IF 9.5
Zhao Yuan,Wang Qingshuang,Yin Dongming,Wang Xiaoli,Li Shouliang,Wang Chunli,Liang Long,Zhao Shaolei,Wang Limin,Cheng Yong
α-AlH 3 is regarded as one of the most promising hydrogen storage materials due to its high hydrogen storage capacity (10.1 wt.%, 148 kg·m −3 ). However, in practical applications, the associated hydrogen release temperature remains relatively high. To effectively address this issue, hollow structured Fe@C nanorods derived from Fe-MOF are introduced as highly efficient catalyst to optimize the dehydrogenation properties of α-AlH 3 . Comparatively, the initial hydrogen release temperature of α-AlH 3 + 3 wt.% Fe@C is reduced to 94.2 °C, which is significantly lower than that of pure α-AlH 3 (137.8 °C). At 100 and 120 °C, it exhibits hydrogen capacities of 5.38 wt.% and 7.47 wt.%, respectively, whereas pure α-AlH 3 only delivers hydrogen capacities of 0.24 wt.% and 5.94 wt.% under the same temperatures. The density functional theory (DFT) calculations further indicate that the existence of Fe@C catalyst can make the length of Al–H bond increase, which is more conducive to the release of hydrogen. The results show that the synergistic effect of Fe and porous carbon in Fe@C nanorods can improve the hydrogen desorption kinetics of α-AlH 3 , providing a good prospect for the application of α-AlH 3 in hydrogen storage fields.
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ENERGY & FUELS
·
2024
·
IF 5.2
Dandan Jia,Jie Zhao,Rui Yan,Hongyi Gao,Zhaolin Fu,Zhongpeng Zhu,Zhiping Tao
The catalytic stability has always been a bottleneck of many reactions in industrial production. The preparation of long-life hydrogenation catalysts has been a hot research topic. Herein, Ni-ZIF was first grown in situ on the surface of SiO2. N-doped Ni/C nanoparticles were uniformly distributed on the SiO2 support after the subsequent annealing process. The uniform dispersion of Ni-ZIF contributed to the high dispersion of the active metal, and the highly dispersed Ni nanoparticles were free from thick carbon layers. The highly dispersed and fully exposed Ni determined its excellent low-temperature hydrogenation activity, which was critical for the extension of the catalyst lifetime. The presence of carbon and nitrogen was also beneficial to improve the stability of the catalyst. The N-doped SiO2@Ni/C catalyst exhibited excellent stability toward the hydrogenation of DCPD under mild condition. 100% DCPD conversion and >90% THDCPD selectivity were maintained after 144 h of continuous fixed-bed operation under GHSV of 2 h–1 at 60–90 °C.
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CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Qinwen Deng,Teng Li,Jun Wang,Shu Zhang,Hongcheng Yang,Caili Xu,Mengqiang Wu
Doping and particle size controlling are two important approaches to improve the electrochemical performance of LiMn x Fe 1−x PO 4 cathode materials . By employing a straightforward hydrothermal method and utilizing cost-effective lithium phosphate (Li 3 PO 4 ) as the precursor, we successfully synthesized high Mn-content LiMn 0.79 Fe 0.2 Mg 0.01 PO 4 /C composites. The results reveal that the minute amount of Mg substantially enhances the electrochemical performance. In the subsequent mechanism study using Li 3 PO 4 precursors with different particle size, we found that the nucleation process, dependent on specific surface area and diffusion rate, is likely to play a critical role for the size and morphology of formed LiMn 0.79 Fe 0.2 Mg 0.01 PO 4 . LiMn 0.79 Fe 0.2 Mg 0.01 PO 4 /C (LMFP-1), synthesized from initially smaller-sized and less agglomerated Li 3 PO 4 (LPO-1), exhibited the most diminutive average particle size coupled with the highest specific surface area, which further facilitated electrolyte interfacial interaction and promoted Li + diffusion kinetics. At 1C, LMFP-1 displayed a specific capacity of 110.7 mAh g −1 , with 97.07% capacity retention after 200 cycles. This study provides pivotal insights for the synthesis of high-performance LiMn x Fe 1−x PO 4 materials.
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CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Dongwei Xu,Zhihao Shen,Mingju Zhang,Xinyuan Li,Lu Deng,Yeqi Ren,Biao Zhao,Xiaoqin Guo,Ping Chen
The rational structural design and compositional merits as well as the synergistic coupling effect can break the properties of single material and broaden the microwave absorption band. Herein, the unique lightweight Fe-doped MnO 2 @C hollow nanocubes are rationally designed and successfully synthesized via a scalable wet chemical process and polydopamine coating followed by high-temperature calcination . By virtue of the unique structure and compositional merits, the as-obtained Fe-doped MnO 2 @C hollow nanocubes (Fe–MnO 2 @C-HNBs) displayed notable microwave absorption performance (MAP), simultaneously achieving ultra-broad absorption bandwidth and strong absorption characteristics at a low thickness of 2.3 mm (the reflection loss of −41.02 dB and the effective absorption bandwidth of 5.86 GHz). Surprisingly, the effective absorption bandwidth (RL < −10 dB) could reach up to 8.08 GHz and the minimum reflection loss (RLmin) was −38.20 dB at the thickness of 2.7 mm. The results further confirmed that the excellent microwave attenuation ability of the as-prepared Fe–MnO 2 @C-HNBs composites benefitted from the special “air@core-shell” structure and multiple heterointerfaces as well as multi-component recombination. These results demonstrated that the as-obtained Fe–MnO 2 @C-HNBs composites could be attractive candidates for broadband microwave absorption materials .
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Xutao Ning,Yongwei Zhong,Bin Zeng,Xiaohai Deng,Linfang Li
Solar-light-driven photocatalysis is a promising solution to remove various pollution and antibiotic. However, its performance is greatly limited by the fast recombination of photogenerated charge carriers. Here, we prepared carbon-encapsulated cerium phosphate nanocomposites (CePO 4 @C) by an in situ one-step hydrothermal synthesis strategy. The carbon layer not only receives electrons from CePO 4 facilitated by an internal electric field over Mott-Schottky heterostructures but also promotes further electron diffusion along a conductive carbon layer, resulting in fast charge transfer and a low charge recombination rate of photogenerated charge carriers. Due to its suitable characteristics, the nanocomposites demonstrated high photocatalytic efficiency (98.8 % for methyl orange and 81.2 % for tetracycline hydrochloride within 40 min). This work provides an in situ one-step synthesis approach for carbon-encapsulated semiconducting oxide nanocomposites that are promising for use as highly efficient photocatalysts in future applications.
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JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY
·
2024
·
IF 3.1
Guanru Chen,Fengjian Chu,Shuheng Zhang,Wangyu Li,Shiwen Zhou,Wei Wei,Weiwei Chen,Xiaozhi Wang,Lei Yue,Hongru Feng,Yanli Cui,Yuanjiang Pan
C–H bond ortho-substitution reaction has always been a significant and challenging topic in organic chemistry. We proposed a synthesis method based on microwave plasma torches. High-resolution mass spectrometry was used to monitor rapid reaction products. 2-Alkylbenzimidazole can be formed through the reaction of phenylnitrenium ion and nitriles on a millisecond scale. This reaction can achieve the one-step formation of benzimidazoles from benzene ring single-substituted compounds without the addition of external oxidants or catalysts. A similar C–H bond activation reaction can be accomplished with ketones. Meanwhile, the microwave plasma reactor was modified, and the resulting 2-methylbenzimidazole was successfully collected, indicating the device has good application potential in organic reactions such as C–H bond activation reaction.
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PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Hong-Li Yue,Hong-Yan Zeng,Jin-Feng Peng,Wei Yan,Kai Zhang,Chao-Wei Luo,Zi-Feng Tian
Constructing amorphous/crystalline heterophase structure with high porosity is a promising strategy to effectively tailor the physicochemical properties of electrode materials and further improve the electrochemical performance of supercapacitors. Here, the porous C-doped NiO (C-NiO) with amorphous/crystalline heterophase grown on NF was prepared using NF as Ni source via a self-sacrificial template method. Calcining the self-sacrificial NiC 2 O 4 template at a suitable temperature (400 °C) was beneficial to the formation of porous heterophase structure with abundant cavities and cracks, resulting in high electrical conductivity and rich ion/electron-transport channels. The density functional theory (DFT) calculations further verified that in-situ C-doping could modulate the electronic structure and enhance the OH − adsorption capability. The unique porous amorphous/crystalline heterophase structure greatly accelerated electrons/ions transfer and Faradaic reaction kinetic, which effectively improved the charge storage. The C-NiO calcined at 400 °C (C-NiO (4 0 0) ) displayed a markedly enhanced specific charge, outstanding rate property and excellent cycling stability. Furthermore, the hybrid supercapacitor assembled by C-NiO (4 0 0) and active carbon achieved a high energy density of 49.0 Wh kg −1 at 800 W kg −1 and excellent cycle stability (90.9 % retention at 5 A/g after 10 000 cycles). This work provided a new strategy for designing amorphous/crystalline heterophase electrode materials in high-performance energy storage.
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