Journal of Materials Chemistry C
·
2024
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IF 5.7
Jinwen Tan,Han Luo,Shiyi Wang,Ling Huang,Liling Cao,Xuehua Dong,Guohong Zou
A short-wave UV antimony(III) oxysalt, RbSb(SO4)(H2PO2)F, by incorporating three different anions (SO42-, H2PO2-, F-) with trivalent antimony cations that possess stereochemically active lone-pair electrons (SCALP), has been successfully synthesized. Significantly, the mixed anions and Sb3+ cations combine to form a low-dimensional 1D infinite anionic chain, denoted as [Sb(SO4)(H2PO2)F]∞-, where synergistic interactions among these units contribute to a substantial birefringence of 0.192 at 546 nm and achieve a short cutoff edge down to 276 nm. This research expands the family of UV birefringent optical materials and provides guidance for the further exploration of novel structural-functional materials.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
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IF 9.7
Xiyue Zhang,Minjie Hou,Jianyong Zhang,Yingjie Zhou,Fupeng Li,Kun Ren,Xuantian Feng,Pengyu Dou,Sicheng Bi,Katsuro Hayashi,Lin Xu,Feng Liang
Alluaudite-type Na 2+2δ Fe 2- δ (SO 4 ) 3 , characterized by its cost-effectiveness and high operating voltage, has emerged as a prospective cathode material for sodium-ion batteries (SIBs). However, poor electronic conductivity and sluggish reaction kinetics hinder its practical application. In this study, we developed a low-strain spherical Na 2.5 Fe 1.75 (SO 4 ) 3 @C@KB (NFS@C@KB) cathode, enclosed within highly conductive Ketjen Black (KB) using a scalable spray-drying method. In-situ X-ray diffraction analysis revealed that the nearly zero-volume strain originates from the synergistic effect of the dense spherical configuration and pearl-like KB branched chains, effectively enhancing the structural stability and prolonging the cycle life. Moreover, the interconnected KB network establishes a continuous electron transport pathway, thereby improving the electronic conductivity. The optimized NFS@C@KB cathode delivered a capacity of 75 mAh g −1 at 5C and exhibited remarkable cycling stability over 4000 cycles. Even under the extreme condition of −20 °C, it retained a discharge capacity of 63 mAh g −1 at a rate of 1C. Consequently, the combination of a low-strain structure and outstanding electrochemical performance is expected to stimulate further exploration of iron-based sulfate cathodes and promote the development of rechargeable SIBs for energy storage applications.
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SOLAR ENERGY
·
2025
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IF 6.6
Jiachen Li,Biao Hu,Hui Wang,Jinxin Yang,Chunwang Li,Xin Du
A eutectic hydrate salt phase change material composed of NH 4 Al(SO 4 ) 2 ·12H 2 O-CH 3 COONa·3H 2 O was prepared. The eutectic composition, determined experimentally to consist of 92.5 wt% NH 4 Al(SO 4 ) 2 ·12H 2 O and 7.5 wt% CH 3 COONa·3H 2 O, deviated significantly from predictions made by the Scholar’s equation, highlighting the need for optimization of theoretical prediction methods. The eutectic material exhibited promising thermal storage properties, but a significant supercooling degree of 12.98 K was observed. To mitigate this issue, 14 different nucleating agents were evaluated and five nucleating agents were identified as effective in reducing the supercooling degree to below 1 °C. Furthermore, the thermophysical properties of the eutectic phase change materials with five preferred nucleating agents, including phase change temperature, latent heat, volume expansion ratio and thermal storage density, were characterized using differential scanning calorimetry, T-history, and solid–liquid density testing. Among the five preferred nucleating agents, Nano Cu demonstrated the best performance, achieving a high thermal storage density of 223.45 kJ/kg and a minimal volume expansion ratio of 4.92 %. Future studies will focus on optimizing heat transfer characterization and integrating this material into renewable energy-based heating systems such as heat pumps, solar heating systems, and valley electric heating systems to achieve sustainable and efficient heating solutions.
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JOURNAL OF ELECTRONIC MATERIALS
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2025
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IF 2.5
Liu Yao,Sun Yilei,Wang Haixia,Meng Zeda,Na Jae Doc,Oh Won-Chun
Owing to the natural abundance of sodium, sodium-ion batteries (SIBs) serve as a more cost-effective option compared with lithium-ion batteries (LIBs), while offering comparable energy storage capabilities. This study presents the compositional optimizations, structural characterizations, and electrochemical performance of a new mixed sodium (Na) superionic conductor (NASICON)-type polyanionic material, NaFe 2 PO 4 (SO 4 ) 2 (NFPS). Subsequently, the introduction of Ni 2+ doping serves to simultaneously improve the structural integrity and electronic conductivity of the material, leading to a collective enhancement of the sodium-ion diffusion channels. The Ni 2+ -incorporated phase, NaFe 1.92 Ni 0.08 PO 4 (SO 4 ) 2 , exhibits faster Na + diffusion, resulting in superior rate and cycling performance versus NFPS. After 80 cycles at 25 mA g −1 , NFPS-Ni 0.08 maintains a discharge capacity of 58.7 mA h g −1 , outperforming undoped NFPS by 20%.
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Korean Journal of Materials Research
·
2025
·Vol. 35
·期 7
·266-276
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IF 0.3
Yao Liu,Yilei Sun,Haixia Wang,Zeda Meng,Won-Chun Oh
Sodium-ion batteries (SIBs) offer a viable alternative to partially or fully replace lithium ion batteries (LIBs) due to their lower cost and increased safety. This paper outlines the compositional optimizations, crystallographic evaluations, and electrochemical behavior of a novel mixed NASICON polyanionic compound, NaFe2PO4(SO4)2 (NFPS). X-ray photoelectron spectrometry (XPS) results showed that cobalt doping produces a higher concentration of oxygen defects compared to undoped samples. Scanning electron microscopy (SEM) analysis results revealed that the modified sample has more uniform pores and pore distribution. Brunauer-Emmett-Teller (BET) measurements showed that doping of Co2+ reduces the specific surface area of NFPS-Co0.08 compared to NFPS. This shortens the sodium ion diffusion pathway and promotes ion dynamics. The addition of Co2+ to the sample significantly improved its performance during galvanostatic charge-discharge tests. The electrochemical activity also is significantly enhanced by Co2+ doping. Na0.84Co0.08Fe2PO4(SO4)2 exhibits superior rate and cycling performance compared to pristine NFPS. After 80 cycles at 25 mA g-1, NFPS-Co0.08 retained discharge specific capacity of 60.8 mA h g-1, which is 1.24 times greater than that of NFPS.
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ACS Nano
·
2026
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IF 16
Jingjing Hou,Shizhong Lv,Jian Liu,Jiaji Tang,Yuwei Wang,Lirui Liu,Zaohui He,Gang Sun,Ai-Min Lv,Liang Deng,Yunlong Zhang,Lei Zhao,Zhenbo Wang
Sodium-ion batteries hold promise for grid-scale energy storage thanks to abundant resources and superior safety, but their wide-temperature operation is hindered by sluggish electronic–ionic transport and structural instability of cathode materials. Herein, a cation-intermixing strategy driven by stoichiometric regulation is proposed for Na2+2xFe2–x(SO4)3 cathodes, which can simultaneously enhance structural stability, improve charge transfer, and facilitate Na+ transport kinetics. Specifically, derived Fe vacancies and concomitant Na+ insertion reconstruct the electronic environment, strengthening Fe–O bonds to stabilize the crystal framework while optimizing Fe 3d electron energy level distribution to facilitate charge transfer. This alteration concurrently widens Na+ migration channels and reduces diffusion barriers, enabling rapid ion transport. Consequently, the Na2.48Fe1.76(SO4)3 cathode (x = 0.24 in Na2+2xFe2–x(SO4)3, with a Na/Fe molar ratio of 1.4) with optimal cation intermixing exhibits exceptional wide-temperature performance. It delivers 85.9% capacity retention following 3000 cycles at 30 C (25 °C) and 88.3% following 4000 cycles at 1 C (−20 °C). Even at an ultrahigh 100 C (60 °C), it still retains 83.2% relative to its capacity measured at 25 °C and 0.1 C. This work provides a stoichiometry-driven approach to designing superior-performance sulfate-based cathodes for wide-temperature sodium-ion batteries.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2026
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IF 9.1
Kaijie Pei,Hang Lyu,Ai-Bo Jia,Rong Zhong,Chuping Chang,Xiaosi Su
Ammonium in groundwater hampers sustainable water use, calling for efficient, stable in-situ remediation technologies. In this study, we design a novel coated sustained-release candle (CSRC) that contains peroxymonosulfate (PMS) and chloride ions (Cl − ). The aim is to construct an in situ long-acting SO 4 • − –Cl − oxidation system for groundwater ammonium removal. The outer coating effectively addressed the issue of “burst release” of paraffin-based sustained-release materials during the initial release stage. It also prolonged the effective release period and guaranteed the synchronous PMS and Cl − release. Systematic static release experiments revealed the critical roles of the CSRC diameter and reagent-to-paraffin mass ratio in regulating the release profiles. Column experiments demonstrated that CSRC deployment within an injection well significantly enhanced the reagent release compared to direct embedding. In addition, the groundwater flow rate exerted no influence on the CSRC release. The long-term operation confirmed the sustained generation of Cl•/ClO• and effective ammonium removal along the flow path. Moreover, three-dimensional tank experiments under varying hydraulic gradients and screen lengths showed that increases in the hydrodynamic conditions and well-screen length markedly improved the radial penetration and vertical dispersion of reagents in the aquifer and enabled the effective ammonium removal for up to 56 days. Collectively, this work presents a feasible and engineered strategy by adjusting the reagents ratio, diameter, and CSRC length that achieves the stable, long-term in-situ chemical oxidation of ammonium in groundwater. This work offers theoretical insights and practical guidance for applying sustained-release material-based remediation systems in the field.
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Yuzhen Zheng,Huijun Xie,Bo Sun,Jian Zhang,Wenxing Wang
A significant loss of the treatment efficiency induced by Cl − is a well-recognized drawback of the SO 4 ·− -based AOPs and various mathematical model have been established to achieve quantitative prediction of the treatment efficiency of SO 4 ·− -based AOPs at different levels of Cl − . However, the background water constituents (e.g., ammonia and dissolved organic matter (DOM)) complicate the chemistry of Cl − /SO 4 ·− system and disable these models. This study shows that the degradation of sulfamethoxazole and bisphenol A by Co 2+ /PMS process decreased with dosing Cl − at fresh water level, due to the shifted distribution of reactive species from SO 4 ·− to Cl 2 ·− , ClO · and HOCl. Besides quenching radicals, HOCl also contributed to pollutant degradation. Though ammonia alone negligibly influence the Co 2+ /PMS process, ammonia reacts with the in situ formed HOCl in the Cl − /SO 4 ·− process rapidly along with the generation of chloramine which mainly severed as radical scavenger rather than oxidant. Consequently, more severe efficiency loss of the SO 4 ·− -based AOPs occur in the copresence of ammonia and Cl − . Unexpectedly, the efficiency loss was alleviated after dosing DOM, which was attributed to the suppressed formation of chloramine. The occurrence of chlorate and disinfection by-products are not concerns in the Co 2+ /PMS process when Cl − coexists with ammonia and DOM, because of the decreased formation of HOCl. These results enhance our understanding of the complex chemistry of SO 4 ·− -based AOPs in real water and promote the progress of SO 4 ·− -based AOPs towards the niche applications in water treatment.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2017
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IF 3.133
Chuanling Sun,Dajiang Mei,Jingli Xu,Yuandong Wu
Two new mixed bismuth (III) tellurite nitrate/sulfate, H[Bi 3 O(Te 3 O 9 )](NO 3 ) 2 and [Bi 2 (TeO 3 ) 2 ](SO 4 ) were synthesized under hydrothermal conditions. H[Bi 3 O(Te 3 O 9 )](NO 3 ) 2 crystallizes in the hexagonal space group P 6 ¯ 2 m (No. 189) with lattice parameters a = 9.8465(4), b = 9.8465(4), c = 4.1917(4) Å, V = 351.95(4) Å 3 , Z = 1, while [Bi 2 (TeO 3 ) 2 ](SO 4 ) crystallizes in the monoclinic space group C 2/ c (No. 15) with lattice parameters a = 15.7657(13), b = 7.4285(5), c = 8.0959(6) Å, β = 112.693(2) ° , V = 874.75(11) Å 3 , Z = 4. The structure of H[Bi 3 O(Te 3 O 9 )](NO 3 ) 2 features one-dimensional cationic 1 ∞ [Bi 3 O(Te 3 O 9 )] + chains along c axis, which are composed of [BiO 7 ] and [TeO 4 ] polyhedra by sharing corners and edges, whereas [Bi 2 (TeO 3 ) 2 ](SO 4 ) possesses a new three-dimensional framework consisting of two-dimensional zigzag layers of 2 ∞ [Bi 2 (TeO 3 ) 2 ] 2+ that are linked by SO 4 2- anions. Title compounds were characterized by single-crystal X-ray diffraction, powder X-ray diffraction, Raman spectra, infrared spectra and solid state UV-vis-NIR diffuse reflectance spectroscopy .
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Energy Storage Materials
·
2024
·
IF 18.9
Zhilin Zheng,Xiaoqiao Li,Yong Wang,Yunlong Zhang,Yufeng Jiang,Yu-Shi He,Chao Niu,Haiying Che,Linsen Li,Zi-Feng Ma
Air stability is a crucial factor in the practical application of a battery material, as it profoundly affects the material's preparation, storage, and electrode fabrication processes. Sodium iron sulfate cathodes, despite their attractive attributes in cost and electrochemical performance, are widely believed to be unstable upon air exposure because of the sulfate group. Here we report remarkable air-stability of the Na 2 Fe(SO 4 ) 2 -based (NFS) cathodes (minimal decay in 20 % RH air for 60 days, 91.9 % capacity retention after 3500 cycles in half cells) and their outstanding cycle performance in practically relevant pouch-type full cells (∼100 Wh kg -1 specific energy, >1000 cycle-life). Although the NFS cathodes do react with moisture H 2 O to produce Na 2 Fe(SO 4 ) 2 ⋅4H 2 O but the hydration is spatially confined at the NFS particles’ surface and not propagating into their bulk. Further, the structural changes are reversible when the surface-hydrated NFS particles are heated in the typical electrode vacuum-drying process, avoiding extra treatment and additional cost. This work reveals the promising properties of the NFS cathode materials towards high-performance and sustainable Na-ion batteries.
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NEW JOURNAL OF CHEMISTRY
·
2025
·
IF 2.5
Yilei Sun,Yao Liu,Haixia Wang,Ze-da Meng,Jae Doc Na,Won-Chun Oh
Sodium-based polyanionic compounds are being widely explored as positive electrode materials for sodium-ion batteries due to the advantages of elevated operating voltage plateaus and exceptional cycling stability. This work investigates the charge/discharge characteristics of a newly developed NASICON-type polyanionic cathode, NaFe2PO4(SO4)2 (NFPS), through X-ray diffraction refinement and cyclic voltammetry. Subsequently, the electrochemical activity is significantly enhanced by Mn2+ doping. Electrochemical testing reveals that Na0.84Mn0.08Fe2PO4(SO4)2 achieves higher capacity and improved rate performance, surpassing pristine NFPS. At a current density of 25 mA g-1, the maximum discharge specific capacity of NFPS-Mn0.08 is 73 mA h g-1. After 60 cycles, the discharge capacity of NFPS-Mn0.08 is 52.7 mA h g-1.
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INORGANIC CHEMISTRY COMMUNICATIONS
·
2025
·
IF 5.4
Jianwei Dao,Liang Yang,Zhihao Jiang,Zihao Han,Tiqin Wei
Narrow-band red inorganic phosphors excited by near-ultraviolet (n-UV) light have significant application potential in the manufacture of white light-emitting diodes (LEDs) with high R9 index. Novel near-UV-excitable Eu 3+ doped K 3 Ca 2 (SO 4 ) 3 × (X = F, Cl, Br) halosulphate phosphors were synthesized via high-temperature solid-state reaction method. By modifying the non-activating ions in the host matrix, the luminescence properties of Eu 3+ were effectively enhanced across various matrices, thereby optimizing the performance of this series of phosphors. As-prepared phosphors can be activated under 397 nm excitation and emit red light at 619 nm, corresponding to 5 D 0 → 7 F 2 transitions of Eu 3+ . Optimization of the doping concentration revealed that the optimal Eu 3+ concentration for different host matrices is 0.13. Notably, the K 3 Ca 2 (SO 4 ) 3 F host matrix doped with Eu 3+ exhibits stronger emission intensity and better performance. The K 3 Ca 2 (SO 4 ) 3 F:0.13Eu 3+ phosphor exhibited long fluorescence lifetime of 0.42 ms and high color purity of 92.25 %. The emission intensity of K 3 Ca 2 (SO 4 ) 3 F:0.13Eu 3+ at 423 K can retain 89.5 % of its value at room temperature. A white LEDs device was fabricated by mixing and encapsulating K 3 Ca 2 (SO 4 ) 3 F:0.13Eu 3+ phosphor with commercial BaMgAl 10 O 17 :Eu 2+ blue and (Ba, Sr) 2 SiO 4 :Eu 2+ green phosphors onto 397 nm n-UV InGaN chip. The device emits bright white light and exhibits high color rendering index (Ra = 79.9, R9 = 86.5) and a suitable correlated color temperature (CCT = 5915 K) at 50 mA drive current. The results suggest that this work provides new assistance in achieving high color rendering white LEDs excited by n-UV light.
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