Journal
NANOSCALE
Volume 12, Issue 14, Pages 7870-7874Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0nr00964d
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Funding
- National Natural Science Foundation of China [21473022, 21673033]
- Academic Exchange Special Fund in UESTC
- AcRF Tier 1, Singapore [RG 111/17, RG 2/17, RG 114/16, RG 113/18]
- AcRF Tier 2, Singapore [MOE 2017-T2-1-021, MOE 2018-T2-1-070]
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Finding new organic materials to address several issues (e.g. capacity, stability, and cycle life) in organic potassium-ion batteries (OPIBs) is very important and highly desirable. Here, to directly investigate the redox reaction of organic pyridine dicarboxylate in OPIBs and to avoid the interference from the redox-active metal ions, a non-redox-metal potassium metal-organic framework (K-MOF), [C7H3KNO4](n), based on pyridine-2,6-dicarboxylic acid (H(2)PDA), has been successfully synthesized and applied as a promising organic anode for long-cycle life PIBs. The crystal structure of [C7H3KNO4](n) was confirmed by single-crystal X-ray diffraction analysis and FT-IR spectra. Moreover, the potassium-storage mechanism of organic pyridine dicarboxylate ligand was revealed by ex situ FT-IR/XRD characterization and theoretical calculations. The as-synthesized K-MOF resulted in a unique and reversible three-step redox reaction, exhibited superior electrochemical performance with the aid of N-K/O-K coordination bonds, and showed a high average specific capacity of 115 mA h g(-1) at 100 mA g(-1) for 300 cycles with the capacity retention of 92%.
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