Sulfur-Doped Carbon for Potassium-Ion Battery Anode: Insight into the Doping and Potassium Storage Mechanism of Sulfur

ACS Nano, Journal Year: 2022, Volume and Issue: 16(12), P. 21443 - 21451

Published: Dec. 9, 2022

The sulfur doping strategy has been attracting extensive interest in potassium-ion battery carbon anodes for the dual potential of improving capacity and kinetics anodes. Understanding potassium storage mechanism is crucial to guide structural design optimization high-performance sulfur-doped Herein, presenting a laboratory-synthesized hard (SHC) with content 6.4 at. % as an example, we clarify reveal role storage. high SHC stems from selective substitution residual trace molecular fragments after sulfurization. As result, thanks multifaceted roles doped storage, about twice much capacity, rate capability, cycling stability achieved against S-free at same test conditions. Furthermore, hybrid capacitors assembled based on anode demonstrate energy/power density (139 Wh kg-1/7.3 kW kg-1), along extraordinary stability.

Language: Английский

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Progress in the use of organic potassium salts for the synthesis of porous carbon nanomaterials: microstructure engineering for advanced supercapacitors

Nanoscale, Journal Year: 2022, Volume and Issue: 14(23), P. 8216 - 8244

Published: Jan. 1, 2022

Multifunctional organic potassium salts in the synthesis of porous carbon nanomaterials are elucidated and constructive viewpoints provided for cost-effective molecular level engineering supercapacitors.

Language: Английский

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Potassium‐Assisted Fabrication of Intrinsic Defects in Porous Carbons for Electrocatalytic CO₂ Reduction

Advanced Materials, Journal Year: 2022, Volume and Issue: 34(42)

Published: Aug. 11, 2022

The fabrication of intrinsic carbon defects is usually tangled with doping effects, and the identification their unique roles in catalysis remains a tough task. Herein, K+ -assisted synthetic strategy developed to afford porous (K-defect-C) abundant complete elimination heteroatom via direct pyrolysis -confined metal-organic frameworks (MOFs). Positron-annihilation lifetime spectroscopy, X-ray absorption fine structure measurement, scanning transmission electron microscopy jointly illustrate existence 12-vacancy-type (V12 ) K-defect-C. Remarkably, K-defect-C achieves ultrahigh CO Faradaic efficiency (99%) at -0.45 V CO2 electroreduction, far surpassing MOF-derived without etching. Theoretical calculations reveal that V12 favor adsorption significantly accelerate formation rate-determining COOH* intermediate, thereby promoting reduction. This work develops novel generate provides new insights into critical role catalysis.

Language: Английский

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Material-based generation, storage, and utilisation of hydrogen

Progress in Materials Science, Journal Year: 2023, Volume and Issue: 135, P. 101104 - 101104

Published: March 5, 2023

Language: Английский

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Iodine conversion chemistry in aqueous batteries: Challenges, strategies, and perspectives

Energy storage materials, Journal Year: 2022, Volume and Issue: 54, P. 339 - 365

Published: Oct. 17, 2022

Language: Английский

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