Unveiling the Synergy of Architecture and Anion Vacancy on Bi2Te3-xNPCNFs for Fast and Stable Potassium Ion Storage
Large volume strain and slow kinetics are the main obstacles to the application of high-specific-capacity alloy-type metal tellurides in potassium-ion storage systems. Herein, Bi2Te3-x nanocrystals with abundant Te-vacancies embedded in nitrogen-doped porous carbon nanofibers (Bi2Te3-xNPCNFs) are proposed to address these challenges. In particular, a hierarchical porous fiber structure can be achieved by the polyvinylpyrrolidone-etching method and is conducive to increasing the Te-vacancy concentration. The unique porous structure together with defect engineering modulates the potassium storage mechanism of Bi2Te3, suppresses structural distortion, and accelerates K+ diffusion capacity. The meticulously designed Bi2Te3-x@NPCNFs electrode exhibits ultrastable cycling stability (over 3500 stable cycles at 1.0 A g-1 with a capacity degradation of only 0.01% per cycle) and outstanding rate capability (109.5 mAh g-1 at 2.0 A g-1). Furthermore, the systematic ex situ characterization confirms that the Bi2Te3-x@NPCNFs electrode undergoes an "intercalation-conversion-step alloying" mechanism for potassium storage. Kinetic analysis and density functional theory calculations reveal the excellent pseudocapacitive performance, attractive K+ adsorption, and fast K+ diffusion ability of the Bi2Te3-x@NPCNFs electrode, which is essential for fast potassium-ion storage. Impressively, the assembled Bi2Te3-x@NPCNFs//activated-carbon potassium-ion hybrid capacitors achieve considerable energy/power density (energy density up to 112 Wh kg-1 at a power density of 1000 W kg-1) and excellent cycling stability (1600 cycles at 10.0 A g-1), indicating their potential practical applications.
| Medienart: |
E-Artikel |
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| Erscheinungsjahr: |
2024 |
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| Erschienen: |
2024 |
| Enthalten in: |
Zur Gesamtaufnahme - volume:16 |
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| Enthalten in: |
ACS applied materials & interfaces - 16(2024), 11 vom: 20. März, Seite 13858-13868 |
| Sprache: |
Englisch |
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| Beteiligte Personen: |
Wang, Gaoyu [VerfasserIn] |
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| Links: |
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| Themen: |
Controllable etching |
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| Anmerkungen: |
Date Revised 20.03.2024 published: Print-Electronic Citation Status PubMed-not-MEDLINE |
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| doi: |
10.1021/acsami.4c00248 |
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| funding: |
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| Förderinstitution / Projekttitel: |
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| 520 | |a Large volume strain and slow kinetics are the main obstacles to the application of high-specific-capacity alloy-type metal tellurides in potassium-ion storage systems. Herein, Bi2Te3-x nanocrystals with abundant Te-vacancies embedded in nitrogen-doped porous carbon nanofibers (Bi2Te3-xNPCNFs) are proposed to address these challenges. In particular, a hierarchical porous fiber structure can be achieved by the polyvinylpyrrolidone-etching method and is conducive to increasing the Te-vacancy concentration. The unique porous structure together with defect engineering modulates the potassium storage mechanism of Bi2Te3, suppresses structural distortion, and accelerates K+ diffusion capacity. The meticulously designed Bi2Te3-x@NPCNFs electrode exhibits ultrastable cycling stability (over 3500 stable cycles at 1.0 A g-1 with a capacity degradation of only 0.01% per cycle) and outstanding rate capability (109.5 mAh g-1 at 2.0 A g-1). Furthermore, the systematic ex situ characterization confirms that the Bi2Te3-x@NPCNFs electrode undergoes an "intercalation-conversion-step alloying" mechanism for potassium storage. Kinetic analysis and density functional theory calculations reveal the excellent pseudocapacitive performance, attractive K+ adsorption, and fast K+ diffusion ability of the Bi2Te3-x@NPCNFs electrode, which is essential for fast potassium-ion storage. Impressively, the assembled Bi2Te3-x@NPCNFs//activated-carbon potassium-ion hybrid capacitors achieve considerable energy/power density (energy density up to 112 Wh kg-1 at a power density of 1000 W kg-1) and excellent cycling stability (1600 cycles at 10.0 A g-1), indicating their potential practical applications | ||
| 650 | 4 | |a Journal Article | |
| 650 | 4 | |a Te vacancy | |
| 650 | 4 | |a controllable etching | |
| 650 | 4 | |a conversion-alloying reaction | |
| 650 | 4 | |a metal tellurides | |
| 650 | 4 | |a porous nanofiber structure | |
| 650 | 4 | |a potassium-ion batteries | |
| 700 | 1 | |a Li, Qinghua |e verfasserin |4 aut | |
| 700 | 1 | |a Zhang, Wei |e verfasserin |4 aut | |
| 700 | 1 | |a Wu, Jiawei |e verfasserin |4 aut | |
| 700 | 1 | |a Fan, Wenbo |e verfasserin |4 aut | |
| 700 | 1 | |a Wang, Lixiang |e verfasserin |4 aut | |
| 700 | 1 | |a Liang, Zhixin |e verfasserin |4 aut | |
| 700 | 1 | |a Huang, Zhijiao |e verfasserin |4 aut | |
| 700 | 1 | |a Lin, Zeyu |e verfasserin |4 aut | |
| 700 | 1 | |a Wang, Guang |e verfasserin |4 aut | |
| 700 | 1 | |a Wang, Junling |e verfasserin |4 aut | |
| 700 | 1 | |a Huang, Shaoming |e verfasserin |4 aut | |
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