Amorphous Tellurium‐Embedded Hierarchical Porous Carbon Nanofibers as High‐Rate and Long‐Life Electrodes for Potassium‐Ion Batteries

Yu, Dandan; Li, Qinghua; Zhang, Wei; Huang, Shaoming

doi:10.1002/smll.202202750

Cited by 21 publications

(15 citation statements)

References 54 publications

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“…It can be found in Figure 5a that the intensity of the absorbance peaks (located at ≈350 nm) in the CoTe 2 @NPCNFs@NC electrode turns slightly stronger during the potassiation process, while the absorption intensities of CoTe 2 @NPCNFs and CoTe 2 @PCNFs electrodes not only become stronger but also shift toward lower wavelengths (situated at about 333 and 328 nm) during the potassiation process (Figure 5b,c), suggesting that the dual-type N-doped carbon layer is beneficial for preventing the dissolution and shuttle reaction of polytellurides. [23] Correspondingly, the color of the electrolyte in the electrolytic cell of the CoTe 2 @NPCNFs@NC electrode changed slightly, while those of the CoTe 2 @NPCNFs and CoTe 2 @PCNFs electrodes turned light brown, which was well matched with the UV-vis spectrum results (as shown in the insets of Figure 5a-c). In particular, CoTe 2 @PCNFs electrodes that were simultaneously stripped of N-doped carbon anchoring and physical confinement by the outer carbon layer exhibited a more alarming dissolution phenomenon for their polytellurides.…”

Section: Resultssupporting

confidence: 79%

Manipulating the Polytellurides of Metallic Telluride for Ultra‐Stable Potassium‐Ion Storage: A Case Study of Carbon‐Confined CoTe₂ Nanofibers

Peng

Zhang

et al. 2023

Advanced Energy Materials

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Transition metal tellurides (TMTes) are promising anode materials for high energy density potassium-ion batteries (PIBs) due to their high electronic conductivity and high theoretical volumetric capacity. Most reported TMTes electrodes have limited lifespans, however, in this work, for the first time, it is revealed that the dissolution and shuttling effect of polytellurides (K 5 Te 3 and K 2 Te) are the key reasons for the rapid deterioration of cycling stability in TMTe-based conversion-and alloy-type anodes. In light of this, a dual-type N-doped carbon-confined CoTe 2 composite material (CoTe 2 @NPCNFs@NC, where NPCNFs stands for N-doped porous carbon nanofibers and NC represents N-doped porous carbon) is proposed to suppress the dissolution and shuttle effect of polytellurides, which boosts the cycling stability up to 1000 cycles at 2 A g −1 . Furthermore, various in situ and ex situ techniques and theoretical calculations are employed to systematically clarify the formation and transformation of polytellurides and to reveal the good physical confinement of the dual-type carbon and the strong chemisorption of pyridinic-N and pyrrolic-N on K 5 Te 3 and K 2 Te. This work highlights the important role of manipulating polytelluride in the design of long-lifespan TMTe anodes for advanced PIBs.

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Section: Resultssupporting

confidence: 79%

Manipulating the Polytellurides of Metallic Telluride for Ultra‐Stable Potassium‐Ion Storage: A Case Study of Carbon‐Confined CoTe₂ Nanofibers

Peng

Zhang

et al. 2023

Advanced Energy Materials

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“…The diffusion-controlled mechanism predominates in the charge storage capacity if the b value is near 0.5. 41 The b values for peaks O, R1, and R2 in Se/W 2 N− C are 0.93, 0.93, and 0.88, respectively, showing that a dominating capacitive process controls the potassium ion storage mechanism, as shown in Figure 4b. Besides, the larger b value can be considered a reflection of more facile reaction kinetics.…”

Section: Resultsmentioning

confidence: 89%

“…The conversion obtains command of capacitive behavior if the calculated b value tends to be 1. The diffusion-controlled mechanism predominates in the charge storage capacity if the b value is near 0.5 . The b values for peaks O, R1, and R2 in Se/W 2 N–C are 0.93, 0.93, and 0.88, respectively, showing that a dominating capacitive process controls the potassium ion storage mechanism, as shown in Figure b.…”

Section: Resultsmentioning

confidence: 91%

Regulating Redox Kinetics by a W₂N Electrocatalyst toward High-Performance K–Se Batteries

Zhou,

Li,

et al. 2023

Energy Fuels

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With the superiority of famous energy density and abundant potassium reserves, potassium−selenium (K−Se) batteries exhibit prominent prospects instead of lithium-ion storage systems. Nonetheless, the performance of K−Se batteries is plagued on account of volume expansion, shuttle effects, and low selenium utilization. To overcome these obstacles, hierarchically porous carbon composites containing a W 2 N electrocatalyst are constructed rationally as the host for encapsulating Se. This porous carbon can enhance the electrode conductivity, and its rich pores can mitigate volume changes. Embedded W 2 N with a high conductivity has a strong chemisorption effect on selenium species and inhibits the shuttling of polyselenides with high efficiency. In addition, the W 2 N electrocatalyst has a bidirectional catalytic effect in K−Se batteries, which can facilitate the reaction kinetics of Se conversion. The Se−W 2 N/C cathode displays an exceptional performance with a reversible capacity of 578 mAh g −1 at 0.05 A g −1 . In addition, the Se−W 2 N−C cathode exhibits a considerable capacity of 345 mAh g −1 at 2 A g −1 and satisfactory cycle durability (286 mAh g −1 at 1 A g −1 over 500 cycles). This work opens up a feasible perspective in regard to the electrode material design for optimizing the reaction behavior and boosting K−Se battery performance.

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“…The previously reported Te/C or Se/C structures prepared by melt-diffusion method with microporesdominant carbon hosts also present a similar TGA curve with two plateaus. [25,26] The Te content in the composites plays a crucial role in the electrochemical performances, which is determined by the pore volume of the MS-PC host. A higher or lower content would lead to the severe capacity decay and the less capacity.…”

Section: Resultsmentioning

confidence: 99%

Biochar‐Derived Hierarchical Porous Carbon as Tellurium Host for High‐Performance Potassium‐Tellurium Batteries

Wu,

Mu,

Qian

et al. 2023

Chemistry A European J

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Potassium ion battery is promising for its high abundance and low redox potential. As a conversion cathode, Te possesses high conductivity and theoretical volumetric capacity to couple with potassium. The stubborn issues of K‐Te battery focus on the large volume change and rapid structure degradation of Te. Herein, we produce biomass carbon from mangosteen shell in a facile method, and obtain a hierarchical porous host with abundance of micropores and mesopores, which is beneficial for hosting Te during K+ storage in K‐Te battery obviously. The specific capacity reach to 560 mAh g‐1 in the initial cycle at 0.1 A g‐1, and remained 83.8% after 200 cycles. Impressively, at a high current density of 2.0 A g‐1, the specific capacity still remained 62.6% after 5000 cycle. These results endow such strategy an efficient way for the development of K‐Te batteries.

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Amorphous Tellurium‐Embedded Hierarchical Porous Carbon Nanofibers as High‐Rate and Long‐Life Electrodes for Potassium‐Ion Batteries

Abstract: Te-HPCNFs electrode were collected during the discharge process in the first cycle at 0.7C by using the UV-2600 spectrophotometer.Research data are not shared.

Cited by 21 publications

References 54 publications

Manipulating the Polytellurides of Metallic Telluride for Ultra‐Stable Potassium‐Ion Storage: A Case Study of Carbon‐Confined CoTe₂ Nanofibers

Manipulating the Polytellurides of Metallic Telluride for Ultra‐Stable Potassium‐Ion Storage: A Case Study of Carbon‐Confined CoTe₂ Nanofibers

Regulating Redox Kinetics by a W₂N Electrocatalyst toward High-Performance K–Se Batteries

Biochar‐Derived Hierarchical Porous Carbon as Tellurium Host for High‐Performance Potassium‐Tellurium Batteries

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Amorphous Tellurium‐Embedded Hierarchical Porous Carbon Nanofibers as High‐Rate and Long‐Life Electrodes for Potassium‐Ion Batteries

Abstract: Te-HPCNFs electrode were collected during the discharge process in the first cycle at 0.7C by using the UV-2600 spectrophotometer.Research data are not shared.

Cited by 21 publications

References 54 publications

Manipulating the Polytellurides of Metallic Telluride for Ultra‐Stable Potassium‐Ion Storage: A Case Study of Carbon‐Confined CoTe2 Nanofibers

Manipulating the Polytellurides of Metallic Telluride for Ultra‐Stable Potassium‐Ion Storage: A Case Study of Carbon‐Confined CoTe2 Nanofibers

Regulating Redox Kinetics by a W2N Electrocatalyst toward High-Performance K–Se Batteries

Biochar‐Derived Hierarchical Porous Carbon as Tellurium Host for High‐Performance Potassium‐Tellurium Batteries

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Manipulating the Polytellurides of Metallic Telluride for Ultra‐Stable Potassium‐Ion Storage: A Case Study of Carbon‐Confined CoTe₂ Nanofibers

Manipulating the Polytellurides of Metallic Telluride for Ultra‐Stable Potassium‐Ion Storage: A Case Study of Carbon‐Confined CoTe₂ Nanofibers

Regulating Redox Kinetics by a W₂N Electrocatalyst toward High-Performance K–Se Batteries