Small
·
2023
·Vol. 20
·期 2
·2305019
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IF 13.3
Liling Dai,Ziyin Guo,Zhao Wang,Shunjie Xu,Shuilong Wang,Wenlu Li,Guodong Zhang,Ya-Jun Cheng,Yonggao Xia
Na-based layered transition metal oxides with an O3-type structure are considered promising cathodes for sodium-ion batteries. However, rapid capacity fading, and poor rate performance caused by serious structural changes and interfacial degradation hamper their use. In this study, a NaPO 3 surface modified O3-type layered NaNi 1/3 Fe 1/3 Mn 1/3 O 2 cathode is synthesized, with improved high-voltage stability through protecting layer against acid attack, which is achieved by a solid-gas reaction between the cathode particles and gaseous P 2 O 5 . The NaPO 3 nanolayer on the surface effectively stabilizes the crystal structure by inhibiting surface parasitic reactions and increasing the observed average voltage. Superior cyclic stability is exhibited by the surface-modified cathode (80.1% vs 63.6%) after 150 cycles at 1 C in the wide voltage range of 2.0 V–4.2 V (vs Na + /Na). Moreover, benefiting from the inherent ionic conduction of NaPO 3 , the surface-modified cathode presents excellent rate capability (103 mAh g −1 vs 60 mAh g −1 ) at 10 C. The outcome of this study demonstrates a practically relevant approach to develop high rate and durable sodium-ion battery technology.
研究领域:
材料科学
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电化学
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能源存储
✓ 已验证
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2022
·Vol. 105
·期 8
·5167-5177
·
IF 4.186
Ruili Zhang,Delong Ma,Jianrong Wang,Yang Chen,Xun Hu
A detailed structural investigation of a series of phosphate laser glasses with composition x Bi 2 O 3 – y Al 2 O 3 –(100 − x – y )NaPO 3 ( x = 0, 10; y = 0, 5, 10, 15, 20) has been conducted using solid-state nuclear magnetic resonance (NMR) techniques and X-ray photoelectron spectroscopy (XPS). 31 P MAS NMR spectroscopy demonstrates that the addition of Bi 2 O 3 and Al 2 O 3 leads to the depolymerization of the phosphorus chain in the process of Q 2 → Q 1 → Q 0 . The various phosphorus species (Q n , n = 0, 1, 2) are identified by 31 P single pulse, 31 P{ 27 Al} rotational echo adiabatic passage double resonance, 31 P{ 27 Al} J-coupling-based heteronuclear multiple-quantum coherence, and 1D refocused INADEQUATE experiments. The results of 23 Na{ 31 P}, 31 P{ 23 Na}, 27 Al{ 31 P} rotational echo double resonance, and XPS consistently confirm that Na + , Al 3+ , and Bi 3+ ions are all bound by phosphorus tetrahedron [PO 4 ] 3− . No bond is formed between these glass modifiers. Based on the complementary evidence from previous experiments, comprehensive local structure models are developed for these Bi 2 O 3 –Al 2 O 3 –NaPO 3 glasses.
研究领域:
材料科学
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固体物理学
✓ 已验证
DOI
高影响因子
JOURNAL OF DRUG DELIVERY SCIENCE AND TECHNOLOGY
·
2019
·
IF 2.606
Baolong Niu,Jie Guo,Xia Guo,Xiaoqing Sun,Chaohui Rao,Chun Liu,Jin Zhang,Ce Zhang,Yan-Ying Fan,Wenfeng Li
Although much effort has been focused on the preparation of stable amorphous calcium phosphate (ACP) nanoparticles , the poor dispersity of ACP nanoparticles in aqueous solution remain an unresolved problem. In this work, hexametaphosphate ((NaPO 3 ) 6 ) was used as a green dispersant to disperse casein-stabilized ACP (casein-ACP) nanoparticles in aqueous solution. Characterization of casein-ACP nanoparticles by X-ray diffraction (XRD) proved that the casein-induced amorphous structures could maintained for at least 3 months at room temperature. Moreover, the effects of (NaPO 3 ) 6 solutions for dispersing casein-ACP nanoparticles in water was studied and their ability to stabilize aqueous casein-ACP dispersions was demonstrated by digital photos. A typical anticancer drug , curcumin (Cur), was employed to evaluate the drug loading abilities and drug release behaviors of prepared nanoparticles. The results showed that the resultants have high drug loading capacity and favorable pH-responsive drug release properties. Furthermore, this drug delivery system showed an excellent ability to damage A549 cells, indicated that the as-prepared casein-ACP-(NaPO 3 ) 6 nanoparticles are promising for the applications in drug delivery.
研究领域:
材料科学
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生物医学工程
·
药学
✓ 已验证
DOI
高影响因子
Journal of Physical Chemistry C
·
2017
·
IF 4.536
Ruili Zhang,Jinjun Ren,Xinqiang Yuan,Yun Cui,Lei Zhang,Long Zhang
Glasses in the system xBi2O3–(100 – x)NaPO3 were prepared using transitional melting–quenching and characterized using solid state nuclear magnetic resonance (SSNMR), X-ray photoelectron spectroscopy (XPS), and Fourier-transform infrared spectroscopy (FT-IR). The addition of Bi2O3 results in the depolymerization of the phosphorus chain and the formation of Q(n) (n = 0, 1, 2) phosphorus species, where n represents the number of P–O–P bonds that can be quantified using 31P magic angle spinning (MAS) NMR and constant-time double-quantum based dipolar recoupling effects nuclear alignment reduction (CT-DQ-DRENAR). The 23Na{31P}, 31P{23Na}, and XPS results consistently prove that both Na+ and Bi3+ ions are bounded by phosphorus tetrahedron [PO4]3–. Unlike other trivalent ions such as Ga3+ and Al3+, which connect with the phosphorus tetrahedron by corner-sharing, Bi3+ ions were first proved to share edge with the phosphorus tetrahedron by the analysis of 31P spectra, taking the charge balance and bond valence consideration into account. Such a difference in connectivity results in significant structural differences.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
Journal of Physical Chemistry C
·
2025
·
IF 3.2
Ke Liang,Lili Hu,Jinjun Ren
Mixed-network former glasses have drawn considerable attention for their ability to combine the advantages of different glass formers. However, chemical incompatibilities among formers often lead to phase separation, hindering practical applications. In this work, glasses with the composition xAl2O3-(80-x)NaPO3-20SiO2 (x = 0, 10, 15, 20, 25 mol %) were synthesized via the melt-quenching method. The atomic-scale structure of these glasses was elucidated using advanced solid-state nuclear magnetic resonance (SSNMR) techniques, including single pulse Magic Angle Spinning (MAS), 31P refocused Incredible Natural Abundance Double Quantum Transfer Experiment (refocused INADEQUATE), Double-Quantum based Dipolar Recoupling Effects Nuclear Alignment Reduction (DQ-DRENAR), 27Al{31P} Rotational Echo Double Resonance (REDOR), 31P{27Al} Rotational Echo Adiabatic Passage Double Resonance (REAPDOR). The results reveal that the 80NaPO3-20SiO2 glass predominantly contains homonuclear linkages (P–O–P, Si–O–Si), while heteronuclear P–O–Si bonds are less favored, leading to Na+ ions enrichment in phosphate-rich regions and evident phase separation. Incorporating Al2O3 promotes P–O–Al bond formation; when the average number of Al atoms bonded per phosphorus exceeds 2, further alumina incorporation promotes the formation of Si–O–Al linkages. Concurrently, Na+ ions begin to migrate from the vicinity of phosphate tetrahedra [PO4] toward silicate tetrahedra [SiO4]. This compositional evolution facilitates the progressive formation of Si–O–Al–O–P linkages, which effectively suppresses phase separation and yields a more homogeneous glass structure.
研究领域:
材料科学
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玻璃化学
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固体核磁共振波谱
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无机化学
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非晶态材料
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产品关联
DOI
高影响因子
Journal of Physical Chemistry C
·
2021
·
IF 4.126
Feng Shi,Lili Hu,Yun Cui,Jinjun Ren
Glasses in the xLa2O3-yAl2O3-(100 – x – y)NaPO3 system were synthesized by a melt quenching method, where 0 ≤ x ≤ 7.5, y = 0 and x = 5, 5 ≤ y ≤ 15. The structures were characterized by advanced multinuclei solid-state nuclear magnetic resonance spectroscopy (SSNMR) and X-ray photoelectron spectroscopy (XPS). 31P MAS NMR spectroscopy indicates that the glass Q2 structure is depolymerized by La2O3 and Al2O3, forming multiple QxAln and QyLan phosphorus species, where n, x, and y represent the number of P–O–P, P–O–Al, and P–O–La bonds, respectively. The various phosphorus species were identified by the J-coupling effect based one and two-dimensional (1D and 2D) experiments such as 2D J-resolved, 1D refocused INADEQUATE and 1D 31P{27Al} J-coupling heteronuclear multiple quantum coherence (HMQC). La is used as a mimic to simulate the local structure of the luminescent rare earth ions. 139La wideband uniform rate smooth truncation quadrupolar Carr–Purcell–Meiboom–Gill (WURST-QCPMG) spectra show that the coordination number of La is dominantly nine, and some La atoms transfer to lower coordination with the addition of Al2O3. La, Al, and Na atoms exclusively bond to phosphorus tetrahedron PO4, which is evidenced by the 31P/23Na, 31P/27Al double resonance NMR, XPS, and the calculation of charge balance. However, the Al/P and La/P connection methods are much different based on the calculation of charge balance and bond number. Finally, comprehensive and novel local structure models are developed for these rare earth-doped aluminum phosphate glasses.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
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