Single-order soft x-ray spectra with spectroscopic photon sieve*

Gao, Yulin; Wei, Lai; Zhang, Qiangqiang; Yang, Zu-Zua; Zhou, Weimin; Cao, Liangcai

doi:10.1088/1674-1056/ab81f0

Cited by 5 publications

(6 citation statements)

References 15 publications

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“…However, more in-depth research on phase structure engineering and morphology regulation of Sb 2 S 3 anode material is necessary to realize high capacity and long lifespan simultaneously. 26 To address this issue, a lot of combined strategies have been adopted, including morphological control, 12 coating (carbon, 27 PPy 28 ), heterostructures construction (CoS 2 /Sb 2 S 3 , 29 Sb 2 S 3 -Bi 2 S 3 , 30 Sb 2 S 3 @FeS 2 , 31 ZnS-Sb 2 S 3 32 ), and conductive substrates incorporation (graphene, 33 RGO, 34 CNTs, 35 MXene 36 ). Among various strategies, multimetal alloying, especially Bi-Sb alloy has been confirmed to be powerful in effectively alleviating severe volume expansion as well as accelerating ion transport kinetics, owing to its complete solid miscibility at any molar ratio and the highly similar physical/chemical properties of Bi and Sb on the electrochemical reaction.…”

Section: Introductionmentioning

confidence: 99%

Understanding the Highly Reversible Potassium Storage of Hollow Ternary (Bi-Sb)₂S₃@N-C Nanocube

et al. 2023

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Metal sulfide anodes have aroused much attention in potassium ion batteries (PIBs) owing to their high theoretical capacities, but the sluggish kinetics and inferior cycling performance caused by severe volumetric change and particle pulverization greatly hinder their further development. Herein, robust hollow structure design together with phase structure engineering endow (Bi-Sb) 2 S 3 @N-C anode with superior (de)potassiation kinetics and excellent electrochemical performances in PIBs. Specifically, in situ X-ray diffraction combined with density functional theory calculations and ex situ X-ray photoelectron spectroscopy and high-resolution transmission electron microscopy (TEM) analyses indicated a fresh reaction mechanism of (Bi-Sb) 2 S 3 anode with a distinctive multistep (de)potassiation route along (003) plane of (Bi,Sb) alloy thanks to the Bi-Sb phase regulation in (Bi-Sb) 2 S 3 anode, ensuring it with superior reaction kinetics. Moreover, in situ TEM characterization revealed the advantages of the hollow nanostructure with carbon shell, facilitating fast ion transport kinetics and high tolerance of volume change as well as enabling the structural integrity of electrode material during (de)potassiation. As a result, the (Bi-Sb) 2 S 3 hollow nanocube with N-doped carbon shell ((Bi-Sb) 2 S 3 @N-C) delivers a high initial Coulombic efficiency of 66.3%, a great rate performance of 289 mAh g −1 at 2.0 A g −1 , and an ultralong cycling life (89% retention after 220 cycles at 0.1 A g −1 and 85% retention after 1600 cycles at 2.0 A g −1 ) in PIBs. Furthermore, the full cell of (Bi-Sb) 2 S 3 @N-C//PTCDA affords a high reversible capacity of 281 mA h g −1 at 1.0 A g −1 after 300 cycles. This work combines structural design and in situ techniques, proving a successful nanostructure engineering strategy to rationalize alloy-type electrode materials for PIBs.

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Section: Introductionmentioning

confidence: 99%

Understanding the Highly Reversible Potassium Storage of Hollow Ternary (Bi-Sb)₂S₃@N-C Nanocube

et al. 2023

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“…In detail, a bvalue of 1.0 or 0.5 reveals that the sodium storage mechanism is totally governed by a surface capacitive or diffusioncontrolled process. 60 As determined from the slopes of linear plots shown in Figure 5B, the b-values of the selected four redox peaks are 0.66, 0.83, 0.67, and 0.84, respectively, suggesting a hybrid sodium storage mechanism related to the total current response for the NiSe 2 /NC electrode. More accurately, the proportions of surface capacitive (k 1 v) and diffusion-controlled (k 2 v 1/2 ) contributions for the sodium storage capacity could be quantitatively estimated at fixed voltages based on the equation of i 61,62 where k 1 and k 2 are two constants.…”

Section: Resultsmentioning

confidence: 91%

Achieving High-Rate and Durable Sodium Storage through Confined Construction of NiSe₂ Particles Embedded in Porous N-Doped Carbon Spheres

Yang,

Sun,

Tang

et al. 2023

Energy Fuels

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As one type of promising anode material, transition-metal selenides have aroused great attention in the research field of sodium-ion batteries (SIBs) on account of their high theoretical capacity. Nevertheless, the intrinsically inferior conductivity, huge volume changes, as well as severe aggregation of transition-metal selenides that take place upon cycling lead to fast degradation of sodium storage performance. In this work, we report the confined construction of NiSe2 particles embedded in porous N-doped carbon spheres (NiSe2/NC) with polydopamine spheres as the functional template involving successive solvothermal, carbonization, and selenization processes. As expected, the porous N-doped carbon spheres could improve the conductivity, facilitate the migration of Na+, and also serve as a stable mechanical support to NiSe2 particles by effectively avoiding the aggregation of NiSe2 and mitigating the volume changes. Consequently, the NiSe2/NC hybrid spheres exhibit a high reversible capacity (489 mA h g–1 at 0.1 A g–1), superior rate capability (212 mA h g–1 at 5 A g–1), and outstanding cycling stability (351 mA h g–1 after 1600 cycles at 1 A g–1). The delicate design of NiSe2/NC hybrid spheres fundamentally offers a valuable guidance for the development of transition-metal selenides, as well as other high capacity anodes with decent electrochemical performance.

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“…In the equation, the parameter b is determined by the peak current (i) and scan rate (ν), which signifies the sodium storage mechanism of KNMMZ. 58 A value of b close to 1 indicates that the material's sodium storage mechanism is primarily governed by pseudo-capacitance; when b values incline to 0.5, the diffusion process dominates the charge/ discharge process. The pseudo-capacitance mentioned here refers to the charge storage phenomenon arising from surface polarization reactions within the battery, primarily attributed to the adsorption and desorption of ions from the electrolyte at the electrode surface.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Electrochemical Mechanism Analysis of Dual-Site Doped on P2-Na_2/3Ni_1/3Mn_2/3O₂ Enabling Anionic and Cationic Redox with Excellent Electrochemical Performance

Xu,

Liu,

Zhu

et al. 2023

ACS Sustainable Chem. Eng.

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In recent years, P2-layered manganese-based cathodes have garnered considerable attention because of their exceptional capacity, high energy density, and facile synthesis. Nevertheless, the poor rate capability and inferior capacity retention at high discharge rates have limited their application in commercial batteries. In this work, we report a stable P2-type Na 0.62 K 0.05 Mn 0.67 Ni 0.17 Mg 0.11 Zn 0.05 O 2 layered oxide cathode material with both alkali metal site doping and transition metal site doping and confirm that the synergistic effect of the K−Mg−Zn system suppresses the phase transition of P2−O2 and reduces the activation energy of interfacial charge transfer. Furthermore, the introduction of the K−Mg−Zn system results in favorable cycling stability rate performance of the sample. Specifically, the initial discharge capacity at 0.1C is measured to 140.9 mAh g −1 , with a capacity retention of 95.1% after 100 cycles at 1C. Remarkably, even after 2000 cycles at 20C, the capacity retention remains at 82.8%. Ex situ X-ray photoelectron spectroscopy (XPS) analysis and the density functional theory (DFT) calculation reveal that the charge compensation during the KNMMZ charging and discharging process can be interpreted as the cooperative action of Mn 3+ /Mn 4+ and Ni 2+ /Ni 3+ /Ni 4+ redox couples in the voltage range of 2−4 V, while peaks around 4.2 V are attributed to the anionic redox action. Ex situ X-ray diffraction (XRD) analysis reveals the pronounced capability of KNMMZ to effectively suppress the P2−O2 phase transition. The complex impedance measurements and the galvanostatic intermittent titration technique validate that the K−Mg−Zn system enhances the diffusion of sodium ions. Furthermore, the full cell demonstrates outstanding cyclic electrochemical performance, underscoring its exceptional stability and durability throughout multiple charge−discharge cycles. Consequently, the P2-type Na 0.62 K 0.05 Mn 0.67 Ni 0.17 Mg 0.11 Zn 0.05 O 2 system presents promising prospects for the advancement of high-energy SIBs in practical applications.

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Single-order soft x-ray spectra with spectroscopic photon sieve*

Cited by 5 publications

References 15 publications

Understanding the Highly Reversible Potassium Storage of Hollow Ternary (Bi-Sb)₂S₃@N-C Nanocube

Understanding the Highly Reversible Potassium Storage of Hollow Ternary (Bi-Sb)₂S₃@N-C Nanocube

Achieving High-Rate and Durable Sodium Storage through Confined Construction of NiSe₂ Particles Embedded in Porous N-Doped Carbon Spheres

Electrochemical Mechanism Analysis of Dual-Site Doped on P2-Na_2/3Ni_1/3Mn_2/3O₂ Enabling Anionic and Cationic Redox with Excellent Electrochemical Performance

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Single-order soft x-ray spectra with spectroscopic photon sieve*

Cited by 5 publications

References 15 publications

Understanding the Highly Reversible Potassium Storage of Hollow Ternary (Bi-Sb)2S3@N-C Nanocube

Understanding the Highly Reversible Potassium Storage of Hollow Ternary (Bi-Sb)2S3@N-C Nanocube

Achieving High-Rate and Durable Sodium Storage through Confined Construction of NiSe2 Particles Embedded in Porous N-Doped Carbon Spheres

Electrochemical Mechanism Analysis of Dual-Site Doped on P2-Na2/3Ni1/3Mn2/3O2 Enabling Anionic and Cationic Redox with Excellent Electrochemical Performance

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Understanding the Highly Reversible Potassium Storage of Hollow Ternary (Bi-Sb)₂S₃@N-C Nanocube

Understanding the Highly Reversible Potassium Storage of Hollow Ternary (Bi-Sb)₂S₃@N-C Nanocube

Achieving High-Rate and Durable Sodium Storage through Confined Construction of NiSe₂ Particles Embedded in Porous N-Doped Carbon Spheres

Electrochemical Mechanism Analysis of Dual-Site Doped on P2-Na_2/3Ni_1/3Mn_2/3O₂ Enabling Anionic and Cationic Redox with Excellent Electrochemical Performance