氧化还原
阳极
钾
吡啶
材料科学
电化学
金属有机骨架
金属
无机化学
晶体结构
化学
电极
有机化学
物理化学
吸附
冶金
作者
Chao Li,Kuaibing Wang,Jingze Li,Qichun Zhang
出处
期刊:Nanoscale
[The Royal Society of Chemistry]
日期:2020-01-01
卷期号:12 (14): 7870-7874
被引量:127
摘要
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 (H2PDA), 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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