期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 142, 期 5, 页码 2653-2664出版社
AMER CHEMICAL SOC
DOI: 10.1021/jacs.9b13050
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资金
- National Science Foundation (NSF) [DMR-1611525]
- Computational Chemical Sciences Program - U.S. Department of Energy, Office of Science, Basic Energy Sciences [DE-FG02-17ER16362]
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-ACO2-06CH11357]
- Department of Energy Office of Science User Facility [DE-ACO205-CH11231]
- NSF
Two iron-semiquinoid framework materials, (H2NMe2)(2)Fe-2(Cl-2 dhbq)(3) (1) and (H2NMe2)(4)Fe-3(Cl-2 dhbq)(3)(SO4)(2) (Cl-2 dhbq(n-) = deprotonated 2,5-dichloro-3,6-dihydroxybenzoquinone) (2-SO4), are shown to possess electrochemical capacities of up to 195 mAh/g. Employing a variety of spectroscopic methods, we demonstrate that these exceptional capacities arise from a combination of metal- and ligand-centered redox processes, a result supported by electronic structure calculations. Importantly, similar capacities are not observed in isostructural frameworks containing redox-inactive metal ions, highlighting the importance of energy alignment between metal and ligand orbitals to achieve high capacities at high potentials in these materials. Prototype lithium-ion devices constructed using 1 as a cathode demonstrate reasonable capacity retention over 50 cycles, with a peak specific energy of 533 Wh/kg, representing the highest value yet reported for a metal-organic framework. In contrast, the capacities of devices using 2-SO4 as a cathode rapidly diminish over several cycles due to the low electronic conductivity of the material, illustrating the nonviability of insulating frameworks as cathode materials. Finally, 1 is further demonstrated to access similar capacities as a sodium-ion or potassium-ion cathode. Together, these results demonstrate the feasibility and versatility of metal-organic frameworks as energy storage materials for a wide range of battery chemistries.
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