Advanced Sustainable Systems
·
2023
·
IF 7.1
Jingyun Wang,Wei Li,Yanhong Li,Aisheng Huang
Fine regulation of the physicochemical structure of carbon-based electrocatalysts to optimize the adsorption energies of oxygen intermediates is critically important to enhance the reaction kinetics of the oxygen evolution/reduction reaction (OER/ORR) but remains a huge challenge. Herein, nano-space confined growth of Co 9 S 8 nanoparticles (NPs) in porous carbon is realized through an in situ confined growth strategy by using thiol-chains functionalized COF (COF-S-SH) as a confined template. COF-S-SH is used as binding sites to immobilize Co ions to improve the interaction between metal nanoparticles (NPs) and carbon skeletons, and simultaneously serves as a confined void to avoid the aggregation metal NPs. Impressively, as an efficient bifunctional catalyst, the resulting Co 9 S 8 /COF-S 800 shows significantly enhanced oxygen electrocatalysis with a small OER-ORR voltage gap of 0.76 V, vastly superior to that of pristine COF-S 800 . Furthermore, the assembled Zn–air battery with Co 9 S 8 /COF-S 800 catalyst displays a high peak power density of 181.5 mW cm −2 and great durability over 60 h charge–discharge cycles.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2023
·
IF 9.9
Yong Xu,Ping Wang,Di Tian,Man Zhang,Weili Dai,Jianping Zou,Shenglian Luo,Xubiao Luo
Photocatalytic CO 2 reduction has been regarded as an ideal method to simulate photosynthesis for achieving carbon neutralization. However, poor charge transfer efficiency limits its development. Herein, an efficient Co/CoP@C catalyst was prepared with compact contact of Co and CoP layer by using MOF as precursor. At the interface of Co/CoP, the difference in functionality between the two phases may result in uneven distribution of electrons, thus forming a self-driven space-chare region. In this region, spontaneous electron transfer is guaranteed, thus facilitating the effective separation of photogenerated carriers as well as boosting the utilization of solar energy. Furthermore, the electron density of active site Co in CoP is increased and more active sites are exposed, which promotes the adsorption and activation of CO 2 molecules. Together with suitable redox potential, low energy barrier for *COOH formation and easy desorption of CO, the reduction rate of CO 2 catalyzed by Co/CoP@C is 4 times higher than that of CoP@C.
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DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2018
·
IF 3.057
Yiwei Zhu,Songliu Yuan,Chengliang Lu,Bing Xie,Pengyuan Fan,Mohsin Ali Marwat,Weigang Ma,Kai Liu,Hongming Liu,Haibo Zhang
Polymer-based nanocomposite capacitors for energy storage with high discharged energy density and charge-discharge efficiency are of great importance to modern electronic devices and electrical systems. Herein, the energy storage properties are improved by applying double-layered core-shell nanoparticles as fillers. The dopamine was adopted as the outermost layer to improve the dispersibility and compatibility between the fillers and matrix. The high resistance of SiO 2 works as a barrier to limit the movement of space charge over the BaTiO 3 (BT) surface when a high electric field is applied, leading to an enhancement of breakdown strength as well as a decreased space charge polarization, so that an enhancement of discharged energy density and charge-discharge efficiency are achieved. The SiO 2 @BT/P(VDF-CTFE) also shows weaker frequency dependence, indicating the reduction of space charge polarization. A possible mechanism of reduced space charge polarization was proposed to explain the effects of SiO 2 . This work demonstrates that constructing a core-shell structure with high resistance is an effective way to improve the energy properties of nanocomposite capacitors.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2024
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IF 5.8
Hui Li,Rui Da,Li-Quan Yao,Hu Li,Peng Tang,Jin-Rui Cai,Li-Mei Lin,Shui-Yuan Chen,Dong Wei,Li-Ping Cai,Gui-Lin Chen
Sulfoselenide Sb 2 (S,Se) 3 , as a potential light-harvester, possesses a flexibly tunable bandgap of 1.1–1.7 eV to match solar radiation spectrum. However, the preparation of a homogenous Sb 2 (S,Se) 3 film is still challenging due to the different growth kinetics in sulfide and selenide compound, which consequentially leads to phase separation, lattice disorder and unfavored band level. This dilemma also occurs in the simple and well-established close space sublimation (CSS) method, and poses a devastating carrier recombination in Sb 2 (S,Se) 3 solar cells. Herein, alloyed powders of Sb 2 (S,Se) 3 are exquisitely synthesized by a thorough gas-solid reaction, delivering a uniform and single phase composition distribution as well as finely-tunable S/Se ratio. Compared with a physically mixed powder source (Sb 2 S 3 /Sb 2 Se 3 ), this alloyed Sb 2 (S,Se) 3 source allows for the fabrication of a homogeneous Sb 2 (S,Se) 3 thin film by CSS, rendering improved ( hk1 ) orientation, dense morphology, a more consistent longitudinal S/Se ratio, and enhanced energy level arrangement. These advancements contribute to enhance carrier transport and reduce carrier recombination. As a result, the efficiency of the solar cell is remarkably boosted from 2.59% to 5.46%, which is among of the highest PCE of full-inorganic Sb 2 (S,Se) 3 devices fabricated through the CSS method.
研究领域:
材料科学
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能源技术
·
半导体物理
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高影响因子
Nature Communications
·
2020
·Vol. 11
·期 1
·1-9
·
IF 12.121
Wang Longlong,Xie Ruicong,Chen Bingbing,Yu Xinrun,Ma Jun,Li Chao,Hu Zhiwei,Sun Xingwei,Xu Chengjun,Dong Shanmu,Chan Ting-Shan,Luo Jun,Cui Guanglei,Chen Liquan
The space charge layer (SCL) is generally considered one of the origins of the sluggish interfacial lithium-ion transport in all-solid-state lithium-ion batteries (ASSLIBs). However, in-situ visualization of the SCL effect on the interfacial lithium-ion transport in sulfide-based ASSLIBs is still a great challenge. Here, we directly observe the electrode/electrolyte interface lithium-ion accumulation resulting from the SCL by investigating the net-charge-density distribution across the high-voltage LiCoO 2 /argyrodite Li 6 PS 5 Cl interface using the in-situ differential phase contrast scanning transmission electron microscopy (DPC-STEM) technique. Moreover, we further demonstrate a built-in electric field and chemical potential coupling strategy to reduce the SCL formation and boost lithium-ion transport across the electrode/electrolyte interface by the in-situ DPC-STEM technique and finite element method simulations. Our findings will strikingly advance the fundamental scientific understanding of the SCL mechanism in ASSLIBs and shed light on rational electrode/electrolyte interface design for high-rate performance ASSLIBs.
研究领域:
材料科学
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电化学
·
显微学
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Polymers
·
2024
·Vol. 16
·期 18
·2563
·
IF 4.7
Ningbo Yi,Xue Guan,Xiaoting Chen,Luojia Xie,Nan Zhang,Jinfeng Liao,Long Su,Yancheng Wu,Feng Gan,Guoqiang Chang,Liyong Tian,Yangfan Zhang
Perovskite is an advanced optoelectronic semiconductor material that has garnered significant attention in recent years. However, its drawback lies in its environmental instability, limiting its practical applications. To tackle this issue, this research delved into the idea of creating a space-confined structure and used electrospinning to produce a film of perovskite nanocomposite fibers. By effectively encapsulating perovskite nanocrystals into a polymer matrix, the perovskite could be shielded from water and oxygen in the environment, thereby reducing the likelihood of perovskite decomposition and enhancing the stability of its structure and properties. This study examined the influence of material composition and the spinning process on the nanofiber structure to create good spatial confinement. This strategy resulted in a high photoluminescence quantum yield of over 80% and a long-term environmental stability of as long as 1000 h over 90% of the original PLQY. By harnessing the flexibility of the composite fibers, this study demonstrated the potential applications and performance of this nanocomposite film in flexible quantum fluorescence conversion for LED applications.
研究领域:
材料科学
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光学工程
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Materials Today Nano
·
2025
·
IF 8.2
Ziqi Zhang,Beibei Zhan,Yuhao Yang,Xiaosi Qi,Junfei Ding,Xiu Gong,Yunpeng Qu,Lei Wang
Metal organic frameworks are broadly used as promising precursors or templates for the fabrication of carbon-based derivatives owing to their exceptional porosities, structural diversities, and large specific surface areas. In this study, a facile method was reported to construct yolk-shell FeCo@air@C nanocomposites via annealing FeCo-prussian blue analogues (PBA)@phenolic resin (PR) precursor at different temperatures under Ar atmosphere. The introduction of PR effectively reinforced the stability of FeCo-PBA microstructure during carbonization process and played a confining role in preventing the serious agglomeration of FeCo nanoparticles. By adjusting the pyrolysis temperature, different categories of yolk-shell FeCo@air@C nanocomposites had been selectively established. Amongst, the FeCo@air@C obtained at 600 °C exhibited the superior electromagnetic wave absorption performances with a minimum reflection loss of -68.3 dB at the thickness of 2.44 mm and an ultrabroad effective absorption bandwidth of 8.2 GHz at 3.20 mm. Interestingly, its corresponding radar cross section value exhibited excellent radar stealth property in the practical applications. Therefore, the results elucidate that the combination of space confinement engineering and temperature optimization strategy is an indeed advanced method to regulate the electromagnetic wave absorption performances of magnetic carbon-based materials derived from FeCo-PBA.
研究领域:
材料科学
·
化学工程
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高影响因子
POLYMER
·
2025
·
IF 4.5
Lili Li,Yuzhe Li,Yulong Wang,Shuang Han,Jiangxu Li,Junguo Gao
As a new-generation cable insulation material, polypropylene (PP) has received much attention and replaced crosslinked polyethylene. However, the space charge accumulation under high fields still needs to be improved to ensure the safe operation of high-voltage direct current (HVDC) cables. Here, PP was chemically grafted with propenoxy-2-hydroxybenzophenone (AHB) to form PP-g-AHB, and ethylene tetrafluoroethylene copolymer (ETFE) was chemically grafted with glycerol (GL) to obtain ETFE-g-GL. Then PP/ETFE co-crystalline supramolecules were prepared via melt blending. The effect of hydrogen bonds on the space charge inhibition of PP/ETFE co-crystalline supramolecules was investigated using molecular dynamics simulation of differential charge density, energy band, and trap energy level combined with microstructure characterization. Simulations and experiments show that PP-g-AHB and ETFE-g-GL can form PP/ETFE co-crystalline supramolecules very well, owing to the existence of hydrogen bonds. When the mass fraction of PP-g-AHB is 80 %, the cocrystallization size of PP/ETFE supramolecules maximizes to 390 ± 10 μm. Under the action of direct current source, the carrier mobility of PP/ETFE co-crystalline supramolecules is as low as 7.94 × 10 −13 m 2 /(V.s), and the space charge is dominated by heteropolarity, when the average charge density minimizes to 0.08 C/m 3 . So far, the charge transport characteristics of PP/ETFE co-crystalline supramoleculars have been significantly improved using hydrogen bonds as a bridge. This study lays a foundation for the application of PP in HVDC cable insulation.
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INTERNATIONAL JOURNAL OF ADHESION AND ADHESIVES
·
2019
·
IF 2.501
Zheng Su,Hua Wang,Xingyou Tian
This paper describes a facile method to control the morphology of polymer colloids and the architecture of polymer film via miniemulsion polymerization. By taking advantage of cyclization between the symmetrical diacrylate cross-linker hexamethylene diacrylate (HDDA) and the pendent vinyl in colloidal particles , the morphology of polymer colloids and the architecture of the after-formed polymer film were able to be well controlled by tuning the loading of cross-linker HDDA and crosslinking time. Four kinds of polymer colloid morphologies and four kinds of film architecture (honeycomb, close-packed, loose-packed, and enhanced-honeycomb) were characterized by TEM. The film formation mechanisms behind them were proposed based on the special and interesting results including Z-average size of the colloidal particles, Mc (molecular weight between crosslinking points) and mechanical properties of polymer film. Our results highly suggested that the morphology of polymer colloids and the polymer film architecture together determine the adhesive properties of the colloidal polymer film. The best of 180°-peel resistance, T-peel resistance and shear resistance of the polymer films were 138.12 N/25 mm, 40.98 N/25 mm and 25.72 N/cm 2 at 2.0 phm, 2.0 phm and 0.4 phm with the same crosslinking time of 90 min, respectively. The proposed method is promising to be scaled up for industrial production due to its well adaptability.
研究领域:
材料科学
·
化学工程
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高影响因子
Energy & Environmental Materials
·
2025
·
IF 14.1
Zihao Zhao,Daili Feng,Xinxin Zhang,Yanhui Feng
Integrating phase change materials (PCM) into thermal insulation materials offers a novel approach to aerospace thermal protection. Herein, we used waste biomass as a template; by selecting the appropriate carbonization temperature, we obtained carbon aerogels (CCA) with extremely high porosity (95.8%) and high pore volume. After encapsulating PEG2000, we achieved high enthalpy (137.79 J g −1 , 91% of pure PEG2000) and low thermal conductivity (0.137 W (m·K) −1 , 45% of pure PEG2000). Thanks to the rich hierarchical nano-micro porous structure of CCA and the high latent heat of PEG2000, CCA/PEG exhibits excellent thermal insulation properties (under a heating temperature of 131 °C, the material takes 1400 s to reach its maximum temperature and can be maintained below 65 °C) and cycle performance. Additionally, irradiation destroyed the structure of CCA/PEG, leading to the degradation of PEG and the formation of other carbonyl-containing compounds, which decreased its latent heat (4.2%) and thermal conductivity (16.1%). However, the irradiation-resistant CCA, acting as a protective layer, minimizes the impact of irradiation on PEG2000. Instead, irradiation enhances the hierarchical porous structure of the material, ultimately improving its thermal insulation performance. CCA/PEG has potential application prospects in thermal protection and aerospace and is a strong competitor for high-efficiency thermal insulation materials.
研究领域:
材料科学
·
航空航天工程
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高影响因子
ACS Sensors
·
2024
·
IF 8.2
Xiangxin Lin,Mingyu Cheng,Xinyi Chen,Jinglan Zhang,Yiping Zhao,Bin Ai
This study innovates plasmonic hydrogen sensors (PHSs) by applying phase space reconstruction (PSR) and convolutional neural networks (CNNs), overcoming previous predictive and sensing limitations. Utilizing a low-cost and efficient colloidal lithography technique, palladium nanocap arrays are created and their spectral signals are transformed into images using PSR and then trained using CNNs for predicting the hydrogen level. The model achieves accurate predictions with average accuracies of 0.95 for pure hydrogen and 0.97 for mixed gases. Performance improvements observed are a reduction in response time by up to 3.7 times (average 2.1 times) across pressures, SNR increased by up to 9.3 times (average 3.9 times) across pressures, and LOD decreased from 16 Pa to an extrapolated 3 Pa, a 5.3-fold improvement. A practical application of remote hydrogen sensing without electronics in hydrogen environments is actualized and achieves a 0.98 average test accuracy. This methodology reimagines PHS capabilities, facilitating advancements in hydrogen monitoring technologies and intelligent spectrum-based sensing.
研究领域:
材料科学
·
人工智能
·
传感技术
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DOI
PubMed
高影响因子
WEAR
·
2025
·
IF 6.1
Yuchen Sun,Chaoyang Zhang,Qiangliang Yu,Mohamed Kamal Ahmed Ali
This study aims to synthesize oil additives tailored for harsh space conditions, particularly atomic oxygen (AO) exposure, to enhance the lubrication performance of aerospace systems. To achieve this, polyhedral oligomeric silsesquioxane (POSS)-based ionic liquid (IL) with varying alkyl chain lengths (n = 8,16) were synthesized through nucleophilic substitution reactions, using octyl-functionalized polyhedral oligomers and halogenated hydrocarbons as precursors. The tribological and resistance AO irradiation properties of POSS-based IL additives (POSS-8-DOSS and POSS-16-DOSS) into PAO10 base oil were systematically investigated in atmospheric and vacuum environments. The properties of the formulated oil revealed that adding 1 wt% POSS-8-DOSS resulted in improved thermal stability compared to POSS-16-DOSS. Conversely, POSS-16-DOSS exhibited better performance in terms of corrosion resistance. Notably, the formulated oil containing POSS-based IL additives reduced the friction coefficient by 39.67–40.38 % in the atmospheric environment and by 65.94–79.89 % in the atomic oxygen radiation environment. Furthermore, the antiwear properties improved by 77.50–90.14 % in the atmospheric environment. Eventually, the results of this study provide valuable insights for advancing the field of aerospace lubrication.
研究领域:
航空宇航科学与技术
·
材料科学
·
摩擦学
·
化学合成
·
表面工程
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高影响因子
危险品化学品经营许可证（带存储）