JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
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2022
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IF 4.383
Cheng Wang,Jiale Yu,Kai Feng,Huidong Guo,Lipeng Wang
In this study, natural clinoptilolite was treated with NaOH solutions of different concentrations under mild ambient conditions. The composition and structure of the as-prepared samples were characterized, and their performance was assessed in terms of the removal of the heavy metal ions Cd 2+ , Cu 2+ , and Cr 3+ from the aqueous solution. The results showed that the composition, structure, and capability of removal of heavy metal ions of the samples were significantly influenced by the NaOH concentrations. The crystal structure of clinoptilolite remained invariant under a relatively low NaOH concentration (≤0.5 M), began transforming into zeolite Na–P under a medium NaOH concentration (∼1.0 M), and then completely transformed into it under a high NaOH concentration (2.0–4.0 M). The samples treated with NaOH had lower SiO 2 /Al 2 O 3 ratios, and were superior to unmodified natural zeolite in removing the heavy metal ions. This method of treatment with relatively high concentrations of NaOH is a simple and effective way to transform natural clinoptilolite into the zeolite Na-P rich ion exchanger, which is suitable for removing heavy metal ions.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2022
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IF 6.371
Ming Tang,Jia-Yi Du,Jin-Ling Ma,Xiao-Dong Wang,Xiong Zhang,Qin-Yin Shen,Fei-Peng Wang,Yu Wang
As the high energy-density energy storage and greenhouse gas capture device, Na-CO 2 battery development is impeded by the sluggish CO 2 reduction and difficult decomposition of insulating discharge products on the cathode. Here, the cobalt (Co)-decorated carbon nanofibers accompanying with slight Co oxidation were used as the self-standing cathode for Na-CO 2 battery. It greatly reduces the discharge overpotential by 500 mV and charge overpotential by 210 mV, delivers a 12 times higher discharge capacity and runs nearly 4 times cycle life than its counterpart. Experiment combined with theory calculation demonstrates that the evenly dispersive, abundant and stable active sites (Co-CoO) with an equal CO 2 adsorption-desorption capability is the key to improving cell performance. This work reveals the importance of catalysts/cathodes and provides a direction to design highly efficient catalysts/cathodes for alkali metal-CO 2 batteries.
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高影响因子
MATERIALS RESEARCH BULLETIN
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2014
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IF 1.968
Li-Ping Jia,Bing Yan
RE–Fe–B–Na (RE = Nd–Er) colloidal nanoparticles are prepared by high-temperature solution synthesis. These nanoparticles are ultra-small monodisperse, air-stable and amorphous, whose particle size and magnetic property are characterized by transmission electron microscope and superconducting quantum interference device. Taking Nd–Fe–B–Na nanoparticle as an example, it is found that the particle size can be controlled in less than 7 nm. Besides, the magnetic properties of RE–Fe–B–Na colloidal nanoparticles can be compared for different rare earth elements. Based on the bulk ferromagnetic coupling, other possible magnetic coupling mechanism is discussed.
研究领域:
材料科学
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磁学
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高影响因子
JOURNAL OF MATERIALS SCIENCE
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2015
·Vol. 50
·期 16
·5466-5474
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IF 2.371
Chen Jiucun,Liu Yinqin,Li Wenjun,Wu Chao,Xu Liqun,Yang Huan
In this work, nanostructured polystyrene/polyaniline/reduced graphene oxide (PS–PANI/rGO) hybrid materials based on in situ reduction of graphene oxide with ascorbic acid and self-assembly have been successfully prepared for electrochemical supercapacitor and Na-ion battery applications. The supercapacitor based on the PS–PANI/rGO as an electrode material exhibits a specific capacitance of 180 F g −1 at a current density of 0.5 A g −1 from −0.4 to 1.0 V and a high energy density of 49 W h kg −1 at the power density of 352.8 W kg −1 . Moreover, the nanostructured PS–PANI/rGO has a good cycle stability (74 % capacitance retention after 5000 cycles), indicating its future potential application in electrochemical energy storage. The material is further used as an anode in Na-ion batteries, and the results show that the porous nanostructured PS–PANI/rGO delivers a high capacity of 155 mA h g −1 and keeps over 150 charge–discharge cycles at a constant current of 100 mA g −1 (0.5 C).
研究领域:
材料科学
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电化学
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高影响因子
JOURNAL OF POWER SOURCES
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2013
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IF 4.675
Liping Zhao,Li Qi,Hongyu Wang
Sodium titanate nanotube (Na-TNT) sample has been prepared by a hydrothermal method using TiO 2 and NaOH as starting materials and then calcined at 400 °C in air. X-ray diffraction and N 2 adsorption–desorption tests have been employed to characterize its crystal and pore structure . The Na-TNT can be used as the negative electrode for electric energy storage devices using Na + -based organic electrolytes. The charge storage mechanism at the Na-TNT negative electrode has been investigated by electrochemical tests (galvanostatic charge–discharge, cyclic voltammetry , etc.), ex-situ XRD and HRTEM measurements. The electric energy storage devices of Na-TNT/graphite have been constructed and the influence of graphite/Na-TNT mass ratio on their performance has been studied.
研究领域:
材料科学
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电化学
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JOURNAL OF POWER SOURCES
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2021
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IF 9.127
Xianda Sun,Yuxuan Lou,Ya-Ling He,Yinshi Li
The rapid footstep of hydrogen society drives people to pursue the reliable, energy-saving, and renewable hydrogen production patterns. Herein, an electricity-hydrogen co-produced Na-ion direct formate fuel cell (e-h 2 Na-DFFC) is proposed as a conceptual avenue to link the CO 2 utilization and H 2 society. Using the solar fuel-formate that can be readily synthetized from carbon dioxide, we experimentally demonstrate the capability of e-h 2 Na-DFFC for continuous co-production of electricity and hydrogen. A proof-of-concept e-h 2 Na-DFFC yields a peak power density as high as 168 mW cm −2 at 380 mA cm −2 associating with the hydrogen production rate reaching 2.9 mL min −1 cm −2 . More importantly, the approximate 100% purity and over 98.9% Faradic efficiency suggest the great potential of this electricity-hydrogen co-production device. In addition, we explore the scalability, stability and applicability of the e-h 2 Na-DFFC. The hydrogen that is produced from the e-h 2 Na-DFFC can be directly fed to hydrogen-oxygen fuel cell, which presents a peak power density of 546 mW cm −2 and a 35-h stable operation at room temperature . This proposed e-h 2 Na-DFFC provides a new pathway for renewable hydrogen production.
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Inorganic Chemistry Frontiers
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2020
·Vol. 7
·期 22
·4438-4444
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IF 5.958
Yakun Tang,Yang Gao,Lang Liu,Yue Zhang,Jing Xie,Xingyan Zeng
Li2FeSiO4 is a superior cathode material for lithium ion batteries (LIBs) owing to its high capacity, low cost, and superior stability. Exhilaratingly, the material also exhibits the desired electrochemical performance as the anode for LIBs in comparison with traditional carbon materials. However, the Li2FeSiO4 anode is subject to a fatal capacity degradation in long cycles, due to its low conductivity and serious particle agglomeration. With inspiration from the unique architecture based on the hybrid nanotubes consisting of active nanoparticles embedded in CNTs, a simple and efficient sol–gel method combined with subsequent calcination has been developed for the synthesis of porous Li2FeSiO4/C hybrid nanotubes. Benefiting from the intrinsic increased conductivity of the hybrid and its robust structure, as the anode for LIBs, it exhibits a high capacity (444.7 mA h g−1 at 0.2 A g−1), superior long cycling stability (161 mA h g−1 at 2 A g−1 after 3000 cycles) and an ultra-high rate capability (261.1 mA h g−1 at 1 A g−1 and 112.9 mA h g−1 at 8 A g−1). Surprisingly, the Na2FeSiO4/C hybrid nanotube also shows satisfactory application prospects as the anode for sodium ion batteries (SIBs). Such hybrids furnish attractive potential for high-performance LIB/SIB anodes, which would be a promising substitution for carbon anodes.
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CHEMICAL ENGINEERING JOURNAL
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2020
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IF 10.652
Yanpei Li,Lei Shi,Xingpeng Gao,Jingyi Wang,Yingying Hu,Xiangwei Wu,Zhaoyin Wen
The hierarchical nickel chloride/reduced graphene oxide (NiCl 2 -rGO) aerogels are synthesized via a facile hydrothermal and freeze-drying methods using low-cost nickel chloride hexahydrate (NiCl 2 ·6H 2 O) as raw material. The NiCl 2 -rGO hybrid aerogel structure enables the uniform distribution of lamellar NiCl 2 on the three-dimensional (3D) cross-linked conductive graphene sheets. When employed as cathode for sodium-nickel chloride (Na-NiCl 2 ) batteries, the as-obtained NiCl 2 -rGO aerogels exhibit excellent electrochemical performance with high reversible capacities (116 mAh g −1 after 50 cycles, 128 mAh g −1 in a fixed capacity window (20%–80% state of charge (SOC)) after 50 cycles), and a ultra-low polarization (0.05 V in the fixed capacity window). The outstanding performance of NiCl 2 -rGO aerogels can be attributed to the excellent conductivity of graphene. Moreover, the strong contact between NiCl 2 and graphene sheets can effectively promote the transfer of electrons. Compared with traditional tubular Na-NiCl 2 batteries, the molar ratio of Ni/NaCl of NiCl 2 -rGO aerogels can be decreased from 1.8 to the stoichiometric ratio (0.5). To the best of our knowledge, this work paves a perspective way for the first time to develop charged-state NiCl 2 -based cathodes with splendid performance for Na-NiCl 2 batteries.
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Journal of Materials Chemistry A
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2021
·Vol. 9
·期 34
·18272-18279
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IF 12.732
Dongmei Dai,Jinxu Qiu,Hongying Hou,Xiaojuan Wang,Siyuan Li,Bobo Cao,Xinxin Zhou,Dai-Huo Liu,Bao Wang,Bao Li
P2-layered metal oxide cathodes exhibit great promise for use in sodium ion batteries due to their unique two-dimensional tunnel structure, high energy density and high redox potential, etc. However, the inferior structural stability and irreversible phase change of P2-layered cathodes inhibit their development. The best effective strategies to improve their structural stability and sodium storage properties are via the optimization of the P2-layered tunnel structure and morphology by adjusting the Na+ contents, lithium substitution and rational element doping. Herein, the first sub-group element (Cu2+, Ag+ and Au+) doped Na0.5Li0.07Mn0.61Co0.16Ni0.16O2 cathodes were successfully prepared and systematically studied using operando X-ray powder diffraction (XRD), Rietveld refinement with corresponding Fourier electron cloud maps and the galvanostatic intermittent titration technique (GITT). These data indicate that the lattice parameters (a/b, c and V), energy barrier, and Na+ diffraction coefficient of sub-group element-doped Na0.5Li0.07Mn0.61Co0.16Ni0.16O2 cathodes are gradually improved in line with an increase in the sub-group element radii, which facilitate the kinetics of Na+ migration due to the synergistic effect between the valence and radius. Additionally, the structural stability and sodium storage mechanism of the optimized hybrid Na0.5Li0.07Mn0.6Co0.16Ni0.16Au0.01O2 electrode was revealed via operando XRD.
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CHEMICAL ENGINEERING JOURNAL
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2020
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IF 10.652
Yanpei Li,Xiangwei Wu,Jingyi Wang,Xingpeng Gao,Yingying Hu,Zhaoyin Wen
The sodium-nickel chloride (Na-NiCl 2 ) batteries technology has been considered as one of the most promising candidates for large-scale electrical energy storage application owing to its abundant electrode material resource, high energy density and safety. However, ultra-excessive Ni in the cathode leads to high material cost and the growth of cathode particles during cycles makes degradation of batteries performances, which hinder the further application of Na-NiCl 2 batteries. To address these challenges, we designed a free-standing Ni-less cathode with Ni/NaCl particles uniformly distributed in the three-dimensional (3D) conductive matrix constructed by carbonfiber (CF) and multiwalled carbon nanotubes (MWCNTs). The 3D hierarchical structure synthesized by low-cost vacuum filtration method can offer sufficient void space to accommodate the growth of NaCl particles and effectively enhance the electronic conductivity of the cathode. When the molar ratio of Ni/NaCl in the cathode is reduced to 1.0, a specific capacity of 90 mAh g −1 for planar Na-NiCl 2 batteries can be achieved after 170 cycles at 190 °C with a capacity retention of 67%, which is higher than that of traditional tubular Na-NiCl 2 batteries.
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SOLID STATE PHENOMENA
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2018
·
IF 0
Li Qian Cheng,Mei Feng,Kai Chen
Single crystalline lead-free (K, Na)NbO3 (KNN) nanostructures have attracted much attention for the high piezoelectricity and environmental compatibility. Especially, the plate-like KNN structures are supposed to be utilized in the synthesis of textured KNN-based ceramics. The KNN plate-like templates were prepared by a two-step molten salt reaction. The layered-perovskite Bi2.5Na3.5Nb5O18 (BNN5) was first prepared by using Bi2O3, Nb2O5, Na2CO3, NaCl as raw materials. The BNN5 precursors possess high aspect ratio with an average size of 15 - 20 μm in width and 0.5 - 1 μm in thickness. Then Bi element in the BNN5 was replaced by Na/K through topochemical reaction, and KNN plate-like products which have anisotropic crystal structure were fabricated. It should be emphasized that piezoresponse force microscopy (PFM) was used to confirm three-dimensional (3-D) morphology, while piezoelectric properties of single crystalline KNN platelets were acquired simultaneously. The as-synthesized KNN structures are expected to play an important role in the study of textured KNN ceramics. Meanwhile, the methodology investigated in this paper can also be applied for further fundamental studies on KNN system as well as other lead-free piezoelectric materials.
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ChemNanoMat
·
2018
·Vol. 4
·期 5
·487-495
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IF 3.173
Zhinian Li,Shenliang Wang,Wei Hong,Shihui Zou,Liping Xiao,Jie Fan
Graphical Smart screens : An intelligent approach was developed to screen Na−Mn−W/SiO 2 catalysts for the oxidative coupling of methane (OCM). Effective composition regions other than the standard composition were successfully excavated. The wide range of the optimal composition allowed a fluctuation of composition during the reaction, which secured its excellent stability in the OCM reaction. Optimizing the performance and understanding the mechanism of metal oxide catalysts in the oxidative coupling of methane (OCM) is one of the most important projects in industrial catalysis. Here, we report an intelligent approach to screen Na−Mn−W/SiO 2 catalysts for the OCM reaction via ink-jet printing and multidimensional group testing. The ink-jet-printing-assisted (IJP-A) synthetic methodology ensured a fast synthesis of 1536 catalysts that were evaluated in 24 tests via a multidimensional group testing strategy (m-GT). After two-round synthesis-and-screening processes, several excellent groups with different composition space were screened out. Among the excellent catalysts, the OCM performance of Na−Mn−W/SiO 2 catalyst with higher Na, Mn and W content (G3 and G7) was less sensitive to its constituent than that of Na−Mn−W/SiO 2 catalyst with lower Na, Mn and W content (G1). These results indicated the sensitivity of performance to its Na, Mn and W content decreased in larger Na, Mn and W spaces, consistent with the complex homogeneous/heterogeneous reaction mechanism and multi-active sites. A series of Na−Mn−W/SiO 2 formulas with good performance also provide a reasonable explanation to its excellent stability for the OCM reaction. In addition, this intelligent optimization in total space offers a pathway to study the multicomponent metal oxide catalyst in the OCM reaction.
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