期刊
NEW JOURNAL OF CHEMISTRY
卷 46, 期 39, 页码 18890-18898出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d2nj03447f
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资金
- US National Science Foundation (NSF) [2154145]
- George Mason University Chemistry & Biochemistry Department
- George Mason University Quantum Science & Engineering Center
- Direct For Mathematical & Physical Scien
- Division Of Chemistry [2154145] Funding Source: National Science Foundation
In this study, a novel organic electrode material, K-DCA, was developed with reversible reaction with potassium ions, exhibiting high specific capacity and sustainable cycling. The composite material, K-DCA-NrGO, coupled with nitrogen-doped reduced graphene oxide, showed higher specific capacity and increased capacity retention.
Developing high-capacity, stable, and sustainable K-ion batteries (KIBs) is an ongoing challenge due to the lack of high-performance and environmentally benign electrode materials. To address this challenge, organic electrode materials that are affordable, abundant, highly sustainable, highly tunable and flexible offer opportunities. Herein, we report a novel N-containing carboxylate salt, K2C12H6N2O4 (K-DCA), with two bipyridine moieties and two carboxylate groups. The carboxylate- and pyridine-based active centers in K-DCA can reversibly react with four K-ions to provide a specific capacity of 163.3 mA h g(-1) with a pair of redox plateaus centered at similar to 0.8 V. When coupling with nitrogen-doped reduced graphene oxide (NrGO), the composite anode material, K-DCA-NrGO, demonstrates a high specific capacity of 225.25 mA h g(-1) and increased capacity retention during long-term cycling. Additionally, the reaction kinetics and mechanism studies demonstrate that the composite exhibits low overpotentials, low interphase resistance, a partial pseudo-capacitance behavior, and stable chemical/morphological structures upon cycling, which contribute to the fast kinetics and long cycle life.
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