The Sodium Storage Mechanism in a Metal-Organic Compound with 3D Framework Structure

Wednesday, 4 October 2017
Prince George's Exhibit Hall D/E (Gaylord National Resort and Convention Center)


In this paper, a metal-organic compound Zn-PTCDA with 3D framework structure is investigated as an anode material for sodium-ion batteries. Zn-PTCDA delivers a high reversible specific capacity of 357.1 mAh g-1 at a current density of 50mA g-1 within the potential window of 0.01-2 V vervus Na/Na+, corresponding to an eight-electron transfer process. The Na ions storage mechanisms are studied by both experimental and theoretical methods. A combination of ex-situ X-ray photoelectron spectroscopy, Fourier transform infrared, X-ray diffraction and calculation studies reveal that both the carboxylate groups and the perylene rings involved in the sodium insertion process. Unraveling the Na insertion mechanism will open up new perspectives for designing novel metal-organic electrode materials.