Research
·
2018
·
IF 0
Jianchao Sun,Yong Lu,Hao Yang,Mo Han,Lianyi Shao,Jun Chen
Na-CO 2 batteries have attracted significant attentions due to their high energy density and effective utilization of greenhouse gas CO 2 . However, all reported Na-CO 2 batteries employ excessive preloaded metal Na, which will lead to safety issues such as dendrite formation and short circuit. In addition, the charging mechanism of reported Na-CO 2 batteries is not very clear. Here we report the Na-CO 2 batteries, starting from the cathode of cheap Na 2 CO 3 and multiwalled carbon nanotubes (CNTs). Due to the effective electron transfer and high reactivity, the decomposition of Na 2 CO 3 and CNTs could take place under 3.8 V. The charging mechanism of 2Na 2 CO 3 + C → 4Na + 3CO 2 without any side reactions is revealed by in/ex situ techniques such as Raman, gas chromatograph, and optical microscope. Dendrite-free Na can quantitatively deposit on the Super P/Al anode because of large specific surface area and low nucleation barrier of the anode for Na plating. The batteries could deliver an energy density of 183 Wh kg −1 (based on the whole mass of the pouch-type batteries, 4 g) with stable cycling performance. This work reveals that safe rechargeable Na-CO 2 batteries could be constructed by cheap Na 2 CO 3 and multiwalled carbon nanotubes.
研究领域:
储能
·
电化学
·
材料科学
·
可持续能源
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DOI
Advanced Science
·
2025
·
IF 14.1
Yanli Zhou,Ao Xu,Zhiqi Li,Yifei Wang,Jiawen Yan,Fuyi Jiang,Wei Liu,Xin Gu,Huan Pang,Jian Yang
Conversion-based metal sulfides/selenides anodes are promising for sodium-ion batteries (SIBs) owing to their high capacities and good electronic conductivity. However, their large volumetric variation during cycling often leads to rapid capacity decay, hindering commercial applications. Meanwhile, developing a low-cost and efficient synthesis strategy to enhance sodium storage remains challenging. Herein, defect engineering is introduced in bulk Fe 7 Se 8 (bulk-Fe 7 Se 8-x ) to fabricate a carbon-free and defect-rich anode. The optimized bulk-Fe 7 Se 8-x realizes remarkable fast-charging performance and good temperature adaptability, achieving excellent cyclic stability (384 mAh g −1 after 1300 cycles at 5 A g −1 and 25 °C, 170.6 mAh g −1 after 1000 cycles at 2 A g −1 and 0 °C, and 371.7 mAh g −1 after 500 cycles at 5 A g −1 and 40 °C) and ultrahigh rate capability (up to 40 A g −1 ), significantly surpassing reported Fe 7 Se 8 anodes. Reaction mechanism and reaction kinetics are elucidated through in/ex situ characterization, kinetics analysis, and DFT calculations. Furthermore, the exploration of full cells demonstrates their potential application of bulk-Fe 7 Se 8-x in SIBs. The universal strategy is also successfully applied to synthesize the high-performance, defect-rich bulk-Fe 7 S 8-x and bulk-CoSe 2-x , which provides an effective approach for other conversion-based anode materials.
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DOI
PubMed
高影响因子
Small
·
2024
·
IF 13
Wentong Yang,Yixiong Ji,Wangxian Chen,Yining Pan,Zifei Chen,Shaoyang Wu,Salvy P. Russo,Yang Xu,Trevor A. Smith,Anthony Chesman,Paul Mulvaney,Fangyang Liu
Sodium (Na) doping is a well-established technique employed in chalcopyrite and kesterite solar cells. While various improvements can be achieved in crystalline quality, electrical properties, or defect passivation of the absorber materials by incorporating Na, a comprehensive demonstration of the desired Na distribution in CZTSSe is still lacking. Herein, a straightforward Na doping approach by dissolving NaCl into the CZTS precursor solution is proposed. It is demonstrated that a favorable Na ion distribution should comprise a precisely controlled Na + concentration at the front surface and an enhanced distribution within the bottom region of the absorber layer. These findings demonstrated that Na ions play several positive roles within the device, leading to an overall power conversion efficiency of 12.51%.
研究领域:
材料科学
·
可再生能源
·
光伏技术
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DOI
高影响因子
Small
·
2025
·Vol. 21
·期 19
·2410703
·
IF 12.1
Chongyang Zhang,Weijia Guo,Xingchen Zhang,Yutian Lu,Zhenxing Yue
Tetragonal tungsten bronze (TTB)-structured ceramics exhibit extraordinary and fascinating dielectric properties due to their unique structural characteristics and abundant compositional tunability. The dielectric and ferroelectric properties are affected by commensurate or incommensurate modulated structures. Herein, the antiferroelectric-relaxor ferroelectric (AFE-RFE) transition in K 2- x Na x PrNb 5 O 15 ceramics with a TTB structure is successfully achieved by constructing incommensurate modulated structures, which are attributed to cation disorder and lattice distortion arising from Na + substitution. Compositions with x ≤ 0.2 exhibit antiferroelectric phases at ambient temperature, with two dielectric anomalies corresponding to ferroelectric-antiferroelectric and antiferroelectric-paraelectric transitions in the dielectric spectra. When x ≥ 0.4, the samples transition into relaxor ferroelectrics with one dielectric anomaly representing the ferroelectric phase transition. Excessive Na + substitution eliminates the AFE temperature plateau and enhances relaxation, as evidenced by the increased incommensurability parameter δ . Notably, the composition with x = 1.0, which has the maximum δ value of 0.255, achieves a high recoverable energy density of 4.65 J cm − 3 and maintains a stable energy storage efficiency exceeding 90%. This work proposes an intriguing strategy for achieving the AFE-RFE transition and provides critical experimental support for the comprehensive investigation of the antiferroelectric with TTB structures.
研究领域:
材料科学
·
铁电材料
·
介电材料
·
储能材料
·
晶体化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2021
·Vol. 37
·期 2
·286-292
·
IF 1.307
Hu Tao,Yang Weiwei,Wang Cheng,Bu Yali,Jin Feng,Zhang Dongwen,Gu Min,Liu Wenhui,Liang Qinghua,Liu Ruiqing,Feng Xiaomiao,Ma Yanwen
Sodiumion batteries(SIBs) have attracted intensive attention as promising alternative to lithium-ionbatteries(LIBs) for large scale energy storage systems because of low cost of sodium, similar energy storage mechanism and the reasonable performance. However, it is still a great challenge to search and design a robust structure of anode materials with excellent cycling stability and high rate capability for SIBs. Herein, multilayer porous vanadium nitride (VN) microsheets are synthesized through a facile and scalable hydrothermal synthesis-nitrogenization strategy as an effective anode material for SIBs. The multilayer porous VN microsheets not only offer more active sites for fast Na + insertion/extraction process and short diffusion pathway, but also effectively buffer the volume change of anode due to more space in the multilayer porous structure. The large proportions of capacitive behavior imply that the Na + charge storage depends on the intercalation pseudocapacitive mechanism. The multilayer porous VN microsheets electrodes manifest excellent cycling stability and rate capability, delivering a discharge capacity of 156.1 mA·h/g at 200 mA/g after 100 cycles, and a discharge capacity of 111.9 mA·h/g at 1.0 A/g even after 2300 cycles with the Coulombic efficiency of nearly 100%.
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DOI
高影响因子
Engineering
·
2021
·
IF 7.553
Qiangqiang Zhang,Quan Zhou,Yaxiang Lu,Yuanjun Shao,Yuruo Qi,Xingguo Qi,Guiming Zhong,Yong Yang,Liquan Chen,Yong-Sheng Hu
The low ionic conductivity of solid-state electrolytes (SSEs) and the inferior interfacial reliability between SSEs and solid-state electrodes are two urgent challenges hindering the application of solid-state sodium batteries (SSSBs). Herein, sodium (Na) super ionic conductor (NASICON)-type SSEs with a nominal composition of Na 3+2 x Zr 2– x Mg x Si 2 PO 12 were synthesized using a facile two-step solid-state method, among which Na 3.3 Zr 1.85 Mg 0.15 Si 2 PO 12 ( x = 0.15, NZSP-Mg 0.15 ) showed the highest ionic conductivity of 3.54 mS∙cm −1 at 25 °C. By means of a thorough investigation, it was verified that the composition of the grain boundary plays a crucial role in determining the total ionic conductivity of NASICON. Furthermore, due to a lack of examination in the literature regarding whether NASICON can provide enough anodic electrochemical stability to enable high-voltage SSSBs, we first adopted a high-voltage Na 3 (VOPO 4 ) 2 F (NVOPF) cathode to verify its compatibility with the optimized NZSP-Mg 0.15 SSE. By comparing the electrochemical performance of cells with different configurations (low-voltage cathode vs high-voltage cathode, liquid electrolytes vs SSEs), along with an X-ray photoelectron spectroscopy evaluation of the after-cycled NZSP-Mg 0.15 , it was demonstrated that the NASICON SSEs are not stable enough under high voltage, suggesting the importance of investigating the interface between the NASICON SSEs and high-voltage cathodes. Furthermore, by coating NZSP-Mg 0.15 NASICON powder onto a polyethylene (PE) separator (PE@NASICON), a 2.42 A∙h non-aqueous Na-ion cell of carbon|PE@NASICON|NaNi 2/9 Cu 1/9 Fe 1/3 Mn 1/3 O 2 was found to deliver an excellent cycling performance with an 88% capacity retention after 2000 cycles, thereby demonstrating the high reliability of SSEs with NASICON-coated separator.
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
He Li,Jiali Jiang,Jianxing Huang,Yunhui Wang,Yueying Peng,Yiyong Zhang,Bing-Joe Hwang,Jinbao Zhao
In this study, one-dimensional Cu2–xSe nanorods synthesized by a simple water evaporation-induced self-assembly approach are served as the anode material for Na-ion batteries for the first time. Cu2–xSe electrodes express outstanding electrochemical properties. The initial discharge capacity is 149.3 mA h g–1 at a current density of 100 mA g–1, and the discharge capacity can remain at 106.2 mA h g–1 after 400 cycles. Even at a high current density of 2000 mA g–1, the discharge capacity of the Cu2–xSe electrode still remains at 62.8 mA h g–1, showing excellent rate performance. Owing to the excellent electronic conductivity and one-dimensional structure of Cu2–xSe, the Cu2–xSe electrodes manifest fast Na+ ion diffusion rate. Moreover, detailed Na+ insertion/extraction mechanism is further investigated by ex situ measurements and theoretical calculations.
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
ACS Applied Electronic Materials
·
2023
·
IF 4.7
Xian Sun,Jiuwu Wang,Chenguang Huang,Yingying Wang,Xiang Cheng,Yue Situ,Hong Huang
Transition metal oxides have attracted extensive research interest for supercapacitors due to efficient ion accessibility of nanostructures. Here, hierarchically hollow α-K0.2MnTi0.07O0.8 nanotubes with high K content are prepared via a self-sacrificial template method. The electrochemical performance of α-K0.2MnTi0.07O0.8 nanotubes is significantly improved when beneficial K+ is intercalated into a considerably ordered α-MnO2 phase with exchangeable Mn–K slabs by a K-pre-reserved reaction. Significantly, the α-K0.2MnTi0.07O0.8 nanotubes activated in a K2SO4 electrolyte exhibit highly capable capacitance behavior with high specific capacitance (334.5 F g–1 at 1 A g–1) and superior cycling stability (88% capacitance retention of the initial after 60,000 cycles). The well-designed α-K0.2MnTi0.07O0.8-based supercapacitor device exhibits an energy density of 25.16 Wh kg–1 at 1600 W kg–1. The morphological electrode-structured designer could be a promising attempt for applications in energy-related fields and even beyond power and storage sources.
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DOI
高影响因子
INORGANIC CHEMISTRY
·
2022
·
IF 5.436
Shuqin Chang,Jipeng Fu,Xuan Sun,Guangcan Bai,Guoquan Liu,Kaina Wang,Ligang Xu,Qi Wei,Thomas Meier,Mingxue Tang
Ce3+-doped SrS phosphors with a charge-compensating Na+ addition were successfully synthesized via a solid-state reaction method, and the related X-ray diffraction patterns can be indexed to the rock-salt-like crystal structure of the Fm3̅m space group. SrS:(Ce3+)x (0.005 ≤ x ≤ 0.05) and SrS:(Ce3+)0.01,(Na+)y (0.005 ≤ y ≤ 0.030) phosphors were excited by 430 nm UV-Vis light, targeted to the 5d1 → 4f1 transition of Ce3+. The composition-optimized SrS:(Ce3+)0.01, (Na+)0.015 phosphors showed an intense broad emission band at λ = 430–700 nm. The doping of Na+ was probed by solid-state nuclear magnetic resonance. The 430 nm pumped white light-emitting diode structure fabricated with a combination of SrS:(Ce3+)0.01,(Na+)0.015 and Sr2Si5N8:Eu2+ phosphors shows a color-rendering index (Ra) of 89.7. The proposed strategy provides new avenues for the design and realization of novel high color quality solid-state LEDs.
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DOI
PubMed
高影响因子
Small
·
2025
·Vol. 21
·期 32
·2503471
·
IF 12.1
Rui Du,Changcheng Liu,Que Huang,Shengnan He,Chao Zheng,Li Guo,Yanjun Chen
For Na 3 V 2 (PO 4 ) 3 (NVP) cathode, the activity and utilization rate of Na and V is the key to affecting its electrochemical properties. However, few studies can simultaneously optimize both. Currently, a facile hydrothermal route is proposed to successfully synthesize the honeycomb-like porous NVP@CHSLS cathodes possessing anchoring effects to enhance the immobilization of active Na/V through in situ carbonation with chitosan and sodium lignosulfonate. DFT calculations demonstrate the N/S co-doped carbon skeleton gains more electrons and behaves with superior charge transfer capability. Accordingly, XAFS verifies the existence of hypervalent V 4+ for the charge balance, as well as a newly generated C-N-V bond inside the bulk, which significantly inhibits the dissolution of V in the electrolyte. Moreover, ex-situ and after-cycled XRD verifies beneficial electrochemical intermediums such as Na 2 S manifest extra sodium fixation characteristics, which not only enter into the CEI membrane to reduce the loss of Na + , but also participate in the de-intercalation of Na + . Furthermore, honeycomb-like porous morphology enriches the active sites for Na + migration and improves the wettability of electrolytes, demonstrated by contact Angle and AFM tests. Consequently, the optimized NVP@CHSLS-2 reveals a high postactivated capacity of 104.5 mAh g −1 at 60 C, and it remains at 98.8% after 10 000 cycles at 60 C.
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DOI
PubMed
高影响因子
JOURNAL OF SEPARATION SCIENCE
·
2024
·Vol. 47
·期 21
·e70012
·
IF 2.8
Zhongping Huang,Qingqing Zhu,Yu Han,Ying Mo,Junhao Zhang,Huijun Liu
Using poly(styrene-divinylbenzene) microspheres as stationary phase matrix and mercaptosuccinic acid as a modifier, a new weak cation exchange resin was synthesized by thiol click reaction. The conditions for thiol-chlorine click reaction and thiol-alkene click reaction were optimized. The surface morphology and chemical composition of the modified microspheres were characterized by scanning electron microscopy, Fourier-transform infrared spectroscopy, and an elemental analyzer. The stationary phase can achieve the separation of six common cations within 25 min. A homemade weak cation chromatographic column was used to determine the impurities of Na + and K + and the content of tetramethylammonium ions in tetramethylammonium hydroxide samples. The method showed a good linear correlation in the range of 0.1–500.0 mg/L with correlation coefficients of 0.9998–0.9999, and the limits of detection (signal-to-noise ratio ≥ 3) were 0.01–0.20 mg/L. The intra-day relative standard deviations (RSDs) were in the range of 1.1%–4.4%, and the inter-day RSDs were in the range of 0.8%–14.8%. The spiked recoveries were in the range of 91.92%–119.86%. The results showed that the prepared stationary phase exhibited effective separation ability and good reproducibility, which was suitable for the analysis of the impurities of Na + , K + , and the content of tetramethylammonium in the tetramethylammonium reagents.
研究领域:
分析化学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nano Research
·
2024
·
IF 9.5
Yang Xingru,Sheng Yuhang,Zhang Linglong,Yang Lun,Xing Fangjian,Di Yunsong,Liu Cihui,Hu Fengrui,Yang Xifeng,Yang Guofeng,Liu Yushen,Gan Zhixing
Luminescent materials with multi-emission features are difficult to be replicated, which are highly desirable for advanced anti-counterfeiting. Here, we report the pioneering synthesis of Mn 2+ /Yb 3+ /Er 3+ tri-doped Cs 2 Ag 0.8 Na 0.2 InCl 6 double perovskites (MYE-DP), which exhibit photoluminescence (PL) covering from visible to near-infrared (NIR). The PL colors under excitations of 254 and 365 nm are notably different due to the changed relative emission intensities of self-trapped excitons (STEs) and Mn 2+ d–d transition. Moreover, under the excitation of a NIR laser, the MYE-DP exhibits upconversion (UC) emissions of Mn 2+ and Er 3+ . After ceasing the excitation, the long-lived trapped electrons can be thermally released to Mn 2+ and Er 3+ ions, resulting in both visible and NIR afterglow. Based on multi-modal emissions of the MYE-DP, we demonstrate a five-level anti-counterfeiting strategy, which significantly increases the anti-counterfeiting security. In addition, this work provides valuable insights into the energy transfer between STEs, Mn 2+ , Ln 3+ , and traps, laying a solid foundation for future development of new lead-free perovskites.
研究领域:
材料科学
·
光学
·
化学
·
物理学
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DOI
高影响因子
危险品化学品经营许可证（带存储）