JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2022
·Vol. 33
·期 5
·2654-2666
·
IF 2.779
Huang Xiaocong,Wei Aixiang,Jun Liu,Zhao Yu,Liu Zhen,Yang Xi
Perovskite solar cells (PSCs) based on hole-transporting-materials (HTM)-free and carbon electrodes have attracted intensive attention due to their low material cost, simple manufacturing process, and high stability. However, their power conversion efficiencies (PCE) need further improvement. In this work, the effect of Br - component x on properties of the MAPb(I 1− x Br x ) 3 thin films as well as photovoltaic performance of PSCs were studied. The MAPb(I 1− x Br x ) 3 thin films were prepared using two-step solution deposition method in ambient air. The Br − component x was varied from 0 to 1 by changing the PbBr 2 to PbI 2 molar ratio in the precursor solution. PSCs based on the HTM-free and carbon electrodes were fabricated in ambient air in this work, aiming to realize reduction of fabrication cost and improve the stability of PSCs. The results indicated that when Br − component x increase, the XRD diffraction peaks of MAPb(I 1− x Br x ) 3 thin films continuously shift to larger diffraction angle, meanwhile, the absorption edge and PL peak continuously shift toward to the shorter wavelength. The PSCs based on MAPbI 2.7 Br 0.3 exhibits an optimal photovoltaic performance, yielding V oc of 0.95 V, J sc of 17.61 mA/cm - 2 , FF of 0.70, and PCE of 11.70%. Its PCE remains 93.3% of the initial efficiency after being exposed in the atmosphere for 700 h.
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高影响因子
Science China-Materials
·
2020
·Vol. 64
·期 2
·362-373
·
IF 6.098
Khan Shahid,Wang Chao,Lu Haoliang,Cao Yufeng,Mao Zeyang,Yan Chenglin,Wang Xianfu
Due to the unique interface and electronic structure, metal/metal oxide composite electrocatalysts have been designed and exploited for electrocatalytic oxygen evolution reaction (OER) in alkaline solution. However, how to fabricate metal/metal oxides with abundant interfaces and well-dispersed metal phases is a challenge, and the synergistic effect between metal and metal oxides on boosting the electrocatalytic activities is still ambiguous. Herein, by controlling the lithium-induced conversion reaction of metal oxides, metal/metal oxide composites with plentiful interfaces and excellent electrical interconnection are fabricated, which can enhance the active sites, and accelerate the mass transfer during the electrocatalytic reaction. As a result, the electrocatalytic oxygen evolution activities of the as-fabricated metal/metal oxide composite catalysts including NiCo/NiCo 2 O 4 , NiMn/NiMn 2 O 4 and CoMn/CoMn 2 O 4 are greatly improved. The catalytic mechanism is also explored using the in-situ X-ray and Raman spectroscopic tracking to uncover the real active centers and the synergistic effect between the metal and metal oxides during water oxidation. Density functional theory plus U (DFT + U) calculation confirms the metal in the composite can optimize the catalytic reaction path and reduce the reaction barrier, thus boosting the electrocatalytic kinetics.
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高影响因子
IONICS
·
2021
·Vol. 27
·期 9
·3869-3873
·
IF 2.817
Zhao Jinguo,Huo Jiaofei,Li Chunfeng
The rechargeable lithium-sulfur battery is an attractive energy storage device due to the high specific capacity and high energy density. The wide application of lithium-sulfur batteries, however, is hindered owing to the rapid capacity fading caused by the polysulfide dissolution and migration between the cathode and anode side. Herein, we demonstrate a new strategy to address the severe problem of polysulfide migration during the electrochemical cycles by designing titanium carbide nanosheets/S hybrid composites. In this unique hybrid structure, the titanium carbide nanosheets could provide fast lithium-ion and electron paths and keep structural stability during the cycles. Moreover, the space of the titanium carbide nanosheets acts as binding sites for trapping polysulfide. As a result, the hybrid titanium carbide nanosheets/S composites exhibit high performance with specific capacity, rate capability, and cycling stability.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2014
·Vol. 49
·期 20
·6961-6966
·
IF 2.305
Liu Hongyu,Xu Jun,Guo Baohua,He Xiangming
In an effort to improve thermal stability and mechanical properties of porous polypropylene (PP) separators for lithium-ion battery, SiO 2 /PP/SiO 2 composite separators were prepared by introducing SiO 2 layer on both sides of PP separator through a dip-coating process, with polyvinylidene fluoride–hexafluoropropylene (PVDF–HFP) as binder. SiO 2 nanoparticles are evenly distributed and closely packed in the coated layer, which features a porous honeycomb structure. This unique porous structure was quantitatively analyzed by Gurley value, and it can retain liquid electrolyte, leading to higher electrolyte uptake and ionic conductivity of the composite separator. The introduction of SiO 2 -coated layers can not only suppress thermal shrinkage but also improve mechanical properties of the composite separator. C-rate capability and cycle performance of composite separator were also investigated, and compared to those of pristine PP separator.
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高影响因子
CELLULOSE
·
2018
·Vol. 25
·期 8
·4757-4769
·
IF 3.809
Li Yunhua,Zhu Hongxiang,Zhang Cunzhi,Cheng Meixiao,He Hui
A novel PEI-grafted magnetic cellulose (Fe 3 O 4 /MCC-PEI) with high amino density was prepared by grafting PEI onto the surface of magnetic cellulose in NaOH/urea aqueous solvent. The embedding of Fe 3 O 4 into cellulose provided excellent magnetic responsiveness for recycling the adsorbent in the magnetic field. The adsorbent for Cr(VI) removal from aqueous solution overcame the disadvantages of adsorbent like difficult recycling, poor regeneration performance and low removal rate at low Cr(VI) concentration. Therefore, the as-prepared Fe 3 O 4 /MCC-PEI showed high Cr(VI) adsorption capacity (198.8 mg/g) which could achieve adsorption equilibrium within 10 min, and the removal rate could reach 100% at low Cr(VI) concentration (less than 1.0 mg/L), demonstrating that the high amino density (7.85 mmol/g) and magnetic responsiveness of the adsorbent can greatly promote adsorption capacity and removal efficiency. The adsorbent also showed promising regeneration performance, and the adsorption capacity remained above 96% after six cycles. Graphical
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高影响因子
IONICS
·
2018
·Vol. 25
·期 6
·2595-2605
·
IF 2.347
Zhang Min,Ma Xiaoyan,Liu Yi,Ma Jingyu,Chen Fang,Zhang Qi
Polyhedral oligomeric silsesquioxane-poly(methyl methacrylate) 8 (POSS-PMMA 8 )/polyvinylidene fluoride (PVDF) hybrid gel polymer electrolyte (HGPE) membranes have been fabricated by using electrospinning along with the use of commercial polypropylene (PP) microporous membranes as its support; the corresponding HGPEs were obtained after being activated into liquid electrolytes. The goal of the study is to incorporate the high mechanical property of microporous PP membrane and superior electrochemical performance of electrospun gel polymer electrolyte to get the high-performance electrolyte for Li-ion battery. As an effective modifier, it is found that the introduction of POSS-polymer plays a vital role in enhancing many properties of HGPEs, and the influence of POSS-(PMMA 46 ) 8 content on overall properties of HGPEs is investigated. In specific, the HGPEs membrane with 12 wt% POSS-(PMMA 46 ) 8 displays a significant uniform fiber diameter with 720 nm and high electrolyte uptake of 322% due to the high porosity of 58%. Meanwhile, a great improvement in mechanical property is obtained with a tensile strength of 34.5 MPa, which is about 7 times of POSS-(PMMA 46 ) 8 /PVDF membrane without support. The interfacial resistance between the corresponding HGPEs and Li electrodes is significantly reduced and as low as 138 Ω. Furthermore, the LiFePO 4 /HGPEs/Li button cell is assembled and excellent cyclability is shown at 0.1 C and 0.5 C, respectively. The results demonstrate that POSS-(PMMA 46 ) 8 /PVDF HGPEs could be applied as a promising HGPE candidate for high-performance Li-ion batteries.
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高影响因子
Journal of Inorganic and Organometallic Polymers and Materials
·
2024
·Vol. 35
·期 1
·206-215
·
IF 3.9
Duan Jinsheng,Liu Zhaogang,Li Yilin,Jia Peijie,Hu Yanhong,Wu Jinxiu
Magnesium aluminum lanthanum hydrotalcite (MgAlLa-CO 3 -LDHs) was modified with diphenyl phosphate to obtain diphenyl phosphate-intercalated magnesium aluminum lanthanum hydrotalcite (MgAlLa-P-LDHs). The prepared materials, MgAlLa-CO 3 -LDHs and MgAlLa-P-LDHs, were subjected to characterization techniques, including Fourier Transform Infrared Spectroscopy (FTIR), X-ray Diffraction (XRD), and Scanning Electron Microscopy (SEM), to ascertain their structural and morphological characteristics. Subsequently, these hydrotalcite-based thermal stabilizers were incorporated into polyvinyl chloride (PVC) to fabricate composite materials. The comprehensive evaluation of the composite materials’ thermal stability, mechanical properties, and plasticization performance was conducted through thermal aging tests, tensile experiments, and plasticization tests. The research findings indicate a significant enhancement in the thermal stability of PVC materials with the introduction of hydrotalcite-based thermal stabilizers. Additionally, there were observed improvements in mechanical properties and plasticization performance. This study provides a thorough experimental and theoretical foundation for the application of rare earth hydrotalcite-based thermal stabilizers in PVC, offering valuable insights for the development and application of environmentally friendly PVC thermal stabilizers.
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2019
·Vol. 30
·期 6
·5929-5935
·
IF 2.195
Lei Ying,Ma Leiqiang,Zheng Rui,Li Yu,Wan Rundong,Chen Wen,Zhou Hongwei,Gao Wensheng
In the present work, a series of single phase Ni-doped skutterudite compounds Ni x Co 4−x Sb 12 (x = 0.1, 0.2, 0.3, 0.4, 0.5) were successful synthesized by 5 min microwave heating for the first time. The resulting ingots was pulverized and sintered by spark plasma sintering to fabricate bulk samples, and their microstructure and thermoelectric properties have been investigated systematically. The results show that the matrix grain characteristics are influenced by Ni concentration and microwave irradiation. The Ni 0.3 Co 3.7 Sb 12 bulk has the smallest and uniform grain size of about 1–2 µm. The maximum power factors of Ni x Co 4−x Sb 12 are 2273, 2479, 2711, 2613 and 2526 µWm −1 K −2 respectively. A highest ZT of 0.52 for Ni 0.3 Co 3.7 Sb 12 is achieved at 773 K along with a total thermal conductivity of 3.8 Wm −1 K −1 .
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高影响因子
IONICS
·
2023
·Vol. 29
·期 10
·4087-4097
·
IF 2.8
Li Hongwei,Wang Huina,Xie Yueyang,Wang Yukun,Yan Guanghong,Wang Bin,Xue Fei
Doping with oxygen
and nitrogen in graphite felt (GF) is critical for enhancing the activity of the electrode material in vanadium redox flow batteries (VRFB). In this paper, we present a combined approach that utilizes Fe etching and nitrogen functionalization by means of K 2 FeO 4 and NH 3 to modify the surface structure of graphite fibers. The results show that the innovative approach enhances the disordered structure of the surface carbon of GF and substantially improves the oxygen and nitrogen functionalized groups. This modified GF is completely hydrophilic, and its assembled electrode energy efficiency is 80.08% at a current density of 80 mA∙cm −2 , compared with 69.87% for the pristine GF. The energy efficiency of the modified GF was maintained at 81.8% after 50 charge-discharge cycles. This can be attributed to the reduced internal resistance of these modified GF electrode as well as to the improved mass transport and charge redox exchange towards VO 2+ /VO 2 + redox couple. The combined approach of Fe etching and nitrogen functionalization significantly enhances the electrochemical activity of the GF electrode. This improves the performance of the VRFB.
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2022
·Vol. 33
·期 8
·5214-5223
·
IF 2.779
Zhang Dewei,Hui Yitao,Cai Junyao,Zhang Manlin,Xu Jianguang,Zhang Qinfang
Cu 3 SbS 4 -based compounds have received significant attention as a promising alternative for p-type thermoelectric materials due to their low-cost, earth abundant resource, and eco-friendly characteristics. However, the practical applications for waste heat utilization and solid-state refrigeration are still limited because of their low conversion efficiency. Herein, a high thermoelectric performance was realized in SiC nanoparticles-dispersed Cu 3 Sb 0.85 Bi 0.06 Sn 0.05 S 4 composites. SiC nanoparticles additives generate the interface potential barriers and increased energy-dependent carrier scattering, leading to enhanced power factor. Moreover, SiC nanoparticles significantly reduces the lattice thermal conductivity due to enhanced phonon scattering. As a result, a high ZT value of 0.61 is achieved at 573 K for the CASBT/0.05 wt % SiC sample, which is enhanced by 39% compared with the pristine sample. Meanwhile, an outstanding average ZT of 0.31 is obtained among the investigated temperature range. This work provides a feasible guidance for designing advanced thermoelectric materials.
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高影响因子
CATALYSIS LETTERS
·
2018
·Vol. 148
·期 3
·953-957
·
IF 2.911
Wang Tingting,Wang Zhiming,Zhao Junjing,Yu Qing,Wang Zhongwei
2,4,6-Trimethylbenzoyldipenylphosphine oxide (TPO) is an important photoinitiator, nevertheless some drawbacks exist in its synthesis. So V/MCM-41 catalysts were designed. Compared with commonly used VO(acac) 2 , V/MCM-41 catalysts exhibited excellent TPO yield (92.5%), which makes the usage of inorganic vanadium possible and is benefit both in academic and in industry. Graphical
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高影响因子
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2020
·Vol. 36
·期 3
·439-446
·
IF 1.063
Wang Yongtao,Guo Xianwei,Lin Zhiyuan,Yang Yubo,Wu Lingqiao,Liu Huan,Yu Haijun
The sphene-type solid electrolyte with high ionic conductivity has been designed for solid-state lithium metal battery. However, the practical applications of solid electrolytes are still suffered by the low relative density and long sintering time of tens of hours with large energy consumption. Here, we introduced the spark plasma sintering technology for fabricating the sphene-type Li 1.125 Ta 0.875 Zr 0.125 SiO 5 solid electrolyte. The dense electrolyte pellet with high relative density of ca. 97.4% and ionic conductivity of ca. 1.44× 10 −5 S/cm at 30 °C can be obtained by spark plasma sintering process within the extremely short time of only ca. 0.1 h. Also the solid electrolyte provides stable electrochemical window of ca. 6.0 V( vs. Li + /Li) and high electrochemical interface stability toward Li metal anode. With the enhanced interfacial contacts between electrodes and electrolyte pellet by the in-situ formed polymer electrolyte, the solid-state lithium metal battery with LiFePO 4 cathode can deliver the initial discharge capacity of ca. 154 mAh/g at 0.1 C and the reversible capacity of ca. 132 mAh/g after 70 cycles with high Coulombic efficiency of 99.5% at 55 °C. Therefore, this study demonstrates a rapid and energy efficient sintering strategy for fabricating the solid electrolyte with dense structure and high ionic conductivity that can be practically applied in solid-state lithium metal batteries with high energy densities and safeties.
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高影响因子
危险品化学品经营许可证（带存储）