DESALINATION
·
2022
·
IF 11.211
Xiaojun Sun,Mengting Di,Li Gao,Lei Hu,Wenji Zheng,Xuehua Ruan,Xiaoming Yan,Gaohong He
Reverse electrodialysis (RED) is a promising membrane-based technology for salinity gradient power while it faces the challenge of the energy loss caused by the insufficient monovalent/multivalent ion selectivity of the membranes (such as Na + /Mg 2+ ). Here, covalent organic frameworks (COFs) with nanometre-scale pores (pore size of ~8 Å) are designed as composite membranes to selectively conduct monovalent ion (Na + ~7.1 Å vs Mg 2+ ~8.6 Å) by size sieving. Compared with the commercial Neosepta CMX membrane, the COF composite membrane effectively inhibits the penetration of Mg 2+ without sacrificing Na + penetration flux in RED, which to a large extent reduces the energy loss in RED caused by the penetration of Mg 2+ . Even for Mg 2+ solution with high molar fraction of 30 %, the maximum power density (P d, max ) of CCM only shows a slight decrease of 1.7 %. In contrast, the P d, max of the commercial Neosepta CMX membrane severely decreases by 35.8 %. This study highlights the prospects of COFs as the significant material for designing monovalent ion selective membranes which can improve energy efficiency in RED.
研究领域:
材料科学
·
环境工程
·
能源技术
✓ 已验证
DOI
高影响因子
ACS Nano
·
2024
·
IF 15.8
Qijie Yu,Jiulin Hu,Xianhui Nie,Yuhan Zeng,Chilin Li
Fluoride-based solid electrolytes (SEs) have emerged as a promising component for high-energy-density rechargeable solid-state batteries (SSBs) in view of their wide electrochemical window, high air stability, and interface compatibility, but they still face the challenge of low ion conductivity and the lack of a desired structure for sodium metal SSBs. Here, we report a sodium-rich heterostructure fluoride SE, Na3GaF6–Ga2O3–NaCl (NGFOC-G), synthesized via in situ oxidation of liquid metal gallium and in situ chlorination using low-melting GaCl3. The distinctive features of NGFOC-G include single-crystal Na3GaF6 domains within an open-framework structure, composite interface decoration of Ga2O3 and NaCl with a concentration gradient, exceptional air stability, and high electrochemical oxidation stability. By leveraging the penetration of gallium at NaF grain boundaries and the in situ self-oxidation to form Ga2O3 nanodomains, the solid-phase reaction kinetics of NaF and GaF3 is activated for facilitating the synthesis of main component Na3GaF6. The introduction of a small amount of a chlorine source during synthesis further softens and modifies the boundaries of Na3GaF6 along with Ga2O3. Benefiting from the enhanced interface ion transport, the optimized NGFOC-G exhibits an ionic conductivity up to 10–4 S/cm at 40 °C, which is the highest level reported among fluoride-based sodium-ion SEs. This SE demonstrates a “self-protection” mechanism, where the formation of a high Young’s modulus transition layer rich in NaF and Na2O under electrochemical driving prevents the dendrite growth of sodium metal. The corresponding Na/Na symmetric cells show minimal voltage hysteresis and stable cycling performance for at least 1000 h. The Na/NGFOC-G/Na3V2(PO4)3 cell demonstrates stable capacity release around 100 mAh/g at room temperature. The Na/NGFOC-G/FeF3 cell delivers a high capacity of 461 mAh/g with an excellent stability of conversion reaction cycling.
研究领域:
材料科学
·
电化学
·
能量存储
✓ 已验证
DOI
高影响因子
APPLIED GEOCHEMISTRY
·
2017
·
IF 2.581
Wei Zhang,Li Zhou,Hongfeng Tang,Heping Li,Wenlei Song,Gang Xie
The solubility of fluorite in hydrothermal conditions is important in ore forming and geothermal processes and groundwater utilization. However, a quantitative description of the geochemical behavior of fluorite under hydrothermal conditions has not been previously reported. In this work, the solubility of fluorite in Na-K-Cl solutions at temperatures up to 260 °C and ionic strengths up to 4 M was determined by experiments and modeling. The solubility products obtained in this work at 30 and 50 °C under ambient pressure and those from literature were used to regress the density model parameters for fluorite solubility product calculation at high temperature. The Pitzer interaction model was adopted to calculate the activity coefficient . The fluorite solubility determined in KCl solution at 250 °C under vapor saturated pressure and that from the literature were combined with the low-temperature thermodynamic properties of heat capacity and osmotic coefficient to obtain the binary parameters of NaF and KF at temperatures up to 260 °C. A thermodynamic model was then developed for calculating the fluorite solubility in Na-K-Cl solution at temperatures up to 260 °C, under vapor saturated pressure and ionic strengths up to 4 M. As calculated from this model, fluorite solubility measured at 200 °C and 0.1 M NaCl was well predicted. Both temperature and ionic strength had significant effects on fluorite solubility, and fluorite exhibited a similar dissolution pattern in both NaCl and KCl solution. When the concentration was lower than 2 M, the solubility of fluorite first increased with temperature, reached a maximum at approximately 100 °C, and then decreased. When the concentration was higher than 2 M, the solubility of fluorite increased monotonically with temperature.
研究领域:
地球化学
·
热液地质学
✓ 已验证
产品关联
DOI
高影响因子
FEBS Journal
·
2018
·Vol. 285
·期 12
·2292-2305
·
IF 4.53
Jin-Hua Guo,Ren-Wang Jiang,Jacob Lauwring Andersen,Mikael Esmann,Natalya U. Fedosova
The information obtained from crystallized complexes of the Na + ,K + -ATPase with cardiotonic steroids (CTS) is not sufficient to explain differences in the inhibitory properties of CTS such as stereoselectivity of CTS binding or effect of glycosylation on the preference to enzyme isoforms. The uncertainty is related to the spatial organization of the hydrophilic cavity at the entrance of the CTS-binding site. Therefore, there is a need to supplement the crystallographic description with data obtained in aqueous solution, where molecules have significant degree of flexibility. This work addresses the applicability of the electron paramagnetic resonance (EPR) method for the purpose. We have designed and synthesized spin-labeled compounds based on the cinobufagin steroid core. The length of the spacer arms between the steroid core and the nitroxide group determines the position of the reporting group (N-O) confined to the binding site. High affinity to Na + ,K + -ATPase is inferred from their ability to inhibit enzymatic activity. The differences between the EPR spectra in the absence and presence of high ouabain concentrations identify the signature peaks originating from the fraction of the spin labels bound within the ouabain site. The degree of perturbations of the EPR spectra depends on the length of the spacer arm. Docking of the compounds into the CTS site suggests which elements of the protein structure might be responsible for interference with the spin label (e.g., steric clashes or immobilization). Thus, the method is suitable for gathering information on the cavity leading to the CTS-binding site in Na + ,K + -ATPase in all conformations with high affinity to CTS .
研究领域:
生物化学
·
药理学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Zhe Xu,Haidi Yang,Xuesen Zhao,Runguo Zheng,Zhishuang Song,Zhiyuan Wang,Hongyu Sun,Yanguo Liu,Dan Wang
O3-NaNi1/3Fe1/3Mn1/3O2 has attracted much attention as a cathode for sodium-ion batteries, because of its low cost and high sodium-ion storage capacity. However, its slow Na+ diffusion kinetics and harmful P3–O3′ phase transition with severe bulk strain at high voltage leads to poor rate capability and fast capacity fading. Herein, we propose a multivariate doping strategy with Cu, Mg, and Ti ions to solve the above problems of the O3-NaNi1/3Fe1/3Mn1/3O2 cathode. The O3–Na(Ni1/3Fe1/3Mn1/3)0.9Cu0.03Mg0.02Ti0.05O2 (NFMCMT) cathode exhibits enlarged Na+ diffusion channels and a strengthened layered structure, which improves the Na+ diffusion kinetics, suppresses the harmful P3–O3′ phase transition at high voltages, and inhibits the intragranular fatigue cracks, leading to enhanced rate capability and cycling performance. As a result, the NFMCMT exhibits outstanding performance in the 2–4.1 V voltage window, delivers a discharge capacity of 151.2 mAh g–1 with the 81.5% capacity retention for 100 cycles at 0.1 C, and 83.1% capacity retention for 300 cycles at 5 C. Especially in the rate performance, the NFMCMT delivers a 115.6 mAh g–1 and 100.1 mAh g–1 discharge capacity even at 5 and 10 C. This work provides an effective multivariate doping strategy for development of high-performance layered oxide cathodes for sodium-ion batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
International Journal of Minerals Metallurgy and Materials
·
2021
·Vol. 28
·期 11
·1868-1874
·
IF 2.232
Xiong Shan-xia,Kuang Jian-lei,Zheng Qian-fang,Xiao Ting,Liu Wen-xiu,Wang Qi,Jiang Peng,Cao Wen-bin
Wood-based panels containing urea-formaldehyde resin result in the long-term release of formaldehyde and threaten human health. In this study, inorganic aluminosilicate coatings prepared by combining metakaolin, silica fume, NaOH, and H 2 O were applied to the surfaces of wood-based panels to obstruct formaldehyde release. The Si/Al, Na/Al, and H 2 O/Na 2 O molar ratios of the coatings were regulated to investigate their effects on the structure and formaldehyde-resistant barrier properties of coatings. Results showed that the cracks in the coatings gradually disappeared and the formaldehyde resistance rates of the barrier increased as the Si/Al molar ratio was increased from 1.6 to 2.2. This value also increased as the Na/Al molar ratio was increased from 0.9 to 1.2 because of the improvement of the degree of polymerization. As the H 2 O/Na 2 O molar ratio was increased from 12 to 15, the thickness of the dry film decreased gradually and led to the reduction in the formaldehyde resistance rate. When the Si/Al, Na/Al, and H 2 O/Na 2 O molar ratios were 2.2, 1.2, and 12, respectively, the inorganic aluminosilicate coating showed good performance as a formaldehyde-resistant barrier and its formaldehyde resistance rate could reach up to 83.2%.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Yixuan Zhao,Lu Liu,Li Zhou,Ruiqi Yang,Changlin Li,Jiexin Chen,Ziyue Hu,Haoran Su,Bin Deng,Xiaohui Ji,Ruijin Yu
New Sm 3+ doped Cd 2 MgTeO 6 tellurate red-emitting phosphors with Na + ions as charge compensation were obtained using a high-temperature solid-state approach at 1000 °C. During this study, the prepared phosphors were subjected to phase purity, particle morphology , luminescence characteristics, thermal stability, and Commission Internationale de L′ Eclairage (CIE) chromaticity. The critical quenching concentration of Sm 3+ doped Cd 2 MgTeO 6 phosphor was 2 mol%. According to Dexter's theory and the calculated R c value (22.21 Å), the dipole-dipole interaction causes the phenomenon of concentration quenching. Particularly, the Cd 2 MgTeO 6 :2 mol%Sm 3+ , 2 mol%Na + phosphor exhibited an evident red-light emission (647 nm) at λ ex = 407 nm because of the 4 G 5/2 to 6 H 9/2 level transition of Sm 3+ . Its internal quantum efficiency (IQE) was 38.87%. It is worth noting that the Cd 2 MgTeO 6 :Sm 3+ , Na + phosphor exhibited abnormal thermal quenching (ATQ) characteristics, and the luminous intensity of the Cd 2 MgTeO 6 :2 mol%Sm 3+ , 2 mol%Na + increased by 7.20% at 480 K compared with the initial temperature. In addition, white LEDs and red LEDs were successfully manufactured with a 408 nm chip. The prepared red LED showed the emission spectrum similar to the absorption spectrum of Phytochrome P r , which is expected to be applied in plant growth. The w-LED had a CCT (correlated color temperature) of 4790 K, color rendering index of 91, and color coordinates of (0.348, 0.335). Therefore, the Cd 2 MgTeO 6 :Sm 3+ , Na + phosphor has demonstrated potential applications in w-LEDs and plant growth LEDs.
研究领域:
材料科学
·
光学工程
·
农业科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Yu-Xin Chang,Yu-Jie Guo,Ya-Xia Yin,Wei-Huan He,Mengmeng Yan,Li-Rong Zheng,Jing Zhang,Qinghua Zhang,Dong Su,Xing Zhang,Jianfeng Mao,Guanjie Li,Shilin Zhang,Sailong Xu
O3-type layered oxide cathodes (NaxTMO2) for sodium-ion batteries (SIBs) have attracted significant attention as one of the most promising potential candidates for practical energy storage applications. The poor Na+ diffusion kinetics is, however, one of the major obstacles to advancing large-scale practical application. Herein, we report bismuth-doped O3-NaNi0.5Mn0.5O2 (NMB) microspheres consisting of unique primary nanoplatelets with the radially oriented {010} active lattice facets. The NMB combines the advantages of the oriented and exposed electrochemical active planes for direct paths of Na+ diffusion, and the thick primary nanoplatelets for less surface parasitic reactions with the electrolyte. Consequently, the NMB cathode exhibits a long-term stability with an excellent capacity retention of 72.5% at 1C after 300 cycles and an enhanced rate capability at a 0.1C to 10C rate (1C = 240 mA g–1). Furthermore, the enhancement is elucidated by the small volume change, thin cathode-electrolyte-interphase (CEI) layer, and rapid Na+ diffusion kinetics. In particular, the radial orientation-based Bi-doping strategy is demonstrated to be effective at boosting electrochemical performance in other layered oxides (such as Bi-doped NaNi0.45Mn0.45Ti0.1O2 and NaNi1/3Fe1/3Mn1/3O2). The results provide a promising strategy of utilizing the advantages of the oriented active facets of primary platelets and secondary particles to develop high-rate layered oxide cathodes for SIBs.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ChemistrySelect
·
2024
·Vol. 9
·期 40
·e202404259
·
IF 1.9
Jiangwei Tao,Yixiao Qiu,Guangsu Tan,Shaoyu Yang,Wenda Li,Weiwei Wang,Yuzhu Wang,Chao Xu
Graphical This work provides in-depth investigation into the electrochemical and structural properties of O3-Na[Li 1/3 Mn 2/3 ]O 2 , a promising high-capacity anionic redox cathode material for sodium-ion batteries. Our findings also indicate that enhanced cycling stability and suppressed impedance increases can be achieved through optimized upper and lower cutoff voltages. Activating anionic redox is an effective strategy for enhancing the capacity of cathode materials in both lithium-ion and sodium-ion batteries. However, the fundamental mechanisms of O3-type sodium anionic redox cathodes remain poorly understood due to the limited availability of such materials, despite their inherent advantages such as high initial sodium content and high reversible capacity. Herein, we employ multiple characterization methods to elucidate the structural and electrochemical properties of O3-Na[Li 1/3 Mn 2/3 ]O 2 , a promising sodium anionic redox cathode developed recently, with a particular focus on the effect of cutoff voltages during electrochemical aging. Our synchrotron powder X-ray diffraction results indicate that charging the material to voltages above 4.1 V induces substantial structural changes, which compromise the structural and electrochemical reversibility of the material. This is corroborated by more rapid capacity decay and increased impedance, attributed to severe degradation on both the surface and in the bulk, as evidenced by the formation of lower valence manganese compounds. Furthermore, increasing the lower cutoff voltage for the discharge process effectively suppresses surface degradation, thereby improving cycling stability. This work offers a comprehensive understanding of a pivotal sodium anionic redox cathode material, providing valuable insights that can drive the development of advanced materials for sodium-ion batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Catalysis Science & Technology
·
2017
·Vol. 7
·期 18
·4064-4078
·
IF 5.773
Qiang Wang,Shiyou Guan,Bing Li
Two-dimensional (2D) graphitic-C3N4 (g-C3N4) was successfully hybridized with one-dimensional (1D) flux-grown Na-modified K2Ti6O13 nanobelts (Na-K2Ti6O13 NBs) for the first time to construct novel 1D/2D Na-K2Ti6O13/g-C3N4 heterostructured photocatalysts using a facile mixing–calcination method. The heterostructured Na-K2Ti6O13/g-C3N4 composites with three-dimensional (3D) hybrid architectures exhibited a remarkably enhanced photocatalytic efficiency for organic pollutant degradation in comparison with pure Na-K2Ti6O13 and g-C3N4 under both simulated sunlight and visible-light irradiation (λ > 420 nm), which could be mainly attributed to the synergistic effects between Na-K2Ti6O13 and g-C3N4 including more efficient interfacial charge transfer, longer lifetimes and the stronger oxidation and reduction ability of photogenerated charge carriers, fundamentally originating from the formation of Na-K2Ti6O13/g-C3N4 heterojunctions based on the well-matched energy-band structures. Moreover, the Na-K2Ti6O13/g-C3N4 hybrids showed good stability and reusability for the photocatalytic degradation of organic pollutants. Finally, the possible mechanisms responsible for the improved simulated sunlight and visible-light photocatalytic performance were also investigated, respectively, based on the results of PL spectra, time-resolved fluorescence decay spectra, radical species trapping experiments, ESR spectra and PL-TA measurements. Overall, this work will not only be beneficial for the design and development of more efficient visible-light-responsive g-C3N4-based composites for solar energy conversion and environmental remediation but will also be influential in optimizing the visible-light photocatalytic activity of wide-band-gap 1D titanate nanomaterials to meet the requirements of practical applications.
研究领域:
材料科学
·
环境科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Shuya Yuan,Guowei Liu,Qingsheng Zhang,Taifeng Liu,Jianjun Yang,Zhongjie Guan
Element doping has been demonstrated as a useful strategy to regulate the band gap and electronic structure of photocatalyst for improving photocatalytic activity. Herein, ZnIn 2 S 4 (ZIS) nanosheets were doped with alkali metal ions (Li + , Na + or K + ) by a simple solution method. Experimental characterizations reveal that alkali metal ions doping reduce the band gap, raise the conduction band position, and improve surface hydrophilicity of ZIS. In addition, theoretical calculations show that Na doping increases the electron density at valence band maximum and surrounding S atom, which is conducive to produce more electrons and effective utilization of electrons, respectively. Benefited from above factors, Na-doped ZIS (Na-ZIS) shows the highest photocatalytic hydrogen evolution performance. Furthermore, CoSe 2 cocatalyst is loaded on the surface of Na-ZIS (CS/Na-ZIS), which further improve the charge separation and prolong the lifetime of charges. As a result, the optimized CS/Na-ZIS shows a H 2 evolution rate of 4525 μmol·g −1 ·h −1 with an apparent quantum efficiency of 27.5 % at 420 nm, which are much higher than that of pure ZIS. This study provides an in-depth understanding of the synergistic effect of Na doping and CoSe 2 cocatalyst in ameliorating photocatalytic activity.
研究领域:
材料科学
·
催化
·
能源材料
·
光化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2025
·
IF 8.3
Shibo Wu,Jingrui Cao,Yang Zhou,Jiahao He,Jiangjie Zhou,Muslum Demir,Hongye Yang,Zaizai Tong,Pianpian Ma
High-entropy perovskite oxides, an emerging electrocatalytic electrode material, integrates the distinctive features of high-entropy materials and perovskites, offering significant potential in electrocatalysis. While adjusting the B-site elements has been a widely adopted approach for modulating the electrocatalytic activity of HEPs, there was a notable lack of systematic investigations into the role of A-site ions in regulating their electrocatalytic performance. To overcome this deficiency, in the present study, La 1-x Na x (CrMnFeCoNi) 1/5 O 3 HEPs were synthesized using carbon nanotubes-based sacrificial template method. It was found that the Na substitution at the A-site not only significantly reduced the synthesis temperature but also facilitated the preservation of carbon nanotubes. This retention contributed to the formation of a three-dimensional network structure, exposing a greater number of active sites. The Na modification induced significant valence fluctuations at the B-site and tailored the oxygen vacancy concentrations, enhancing the synergistic "cocktail effect" among the various metal atoms. Furthermore, the introduction of Na stimulated the formation of surface M-OOH species, which serve as active intermediates to enhance OER activity. As a result, the Na-modified HEPs demonstrated exceptional OER performance compared to their parent phases. Among these, La 0.6 Na 0.4 (CrMnFeCoNi) 1/5 O 3 (L6N4-5M) sample exhibited a lower overpotential of 313 mV at a current density of 10 mA cm −2 and a Tafel slope of 47.4 mV dec −1 . Additionally, the A-site Na modification strategy and the in-depth investigation of the OER mechanism provide valuable insights for the future design and development of high-performance HEP electrocatalysts.
研究领域:
材料科学
·
电催化领域
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）