Pseudocapacitive Charge Storage in Thick Composite MoS2 Nanocrystal-Based Electrodes

Pseudocapacitive Charge Storage in Thick Composite MoS2 Nanocrystal-Based Electrodes
김형석John B. CookTerri C. LinChun-Han LaiBruce DunnSarah H. Tolbert
Issue Date
Advanced Energy Materials
VOL 7, NO 2, 1601283
A synthesis methodology is demonstrated to produce MoS2 nanoparticles with an expanded atomic lamellar structure that are ideal for Faradaic-based capacitive charge storage. While much of the work on MoS2 focuses on the high capacity conversion reaction, that process is prone to poor reversibility. The pseudocapacitive intercalation-based charge storage reaction of MoS2 is investigated, which is extremely fast and highly reversible. A major challenge in the field of pseudocapacitive-based energy storage is the development of thick electrodes from nanostructured materials that can sustain the fast inherent kinetics of the active nanocrystalline material. Here a composite electrode comprised of a poly(acrylic acid) binder, carbon fibers, and carbon black additives is utilized. These electrodes deliver a specific capacity of 90 mAh g(-1) in less than 20 s and can be cycled 3000 times while retaining over 80% of the original capacity. Quantitative kinetic analysis indicates that over 80% of the charge storage in these MoS2 nanocrystals is pseudocapacitive. Asymmetric full cell devices utilizing a MoS2 nanocrystal-based electrode and an activated carbon electrode achieve a maximum power density of 5.3 kW kg(-1) (with 6 Wh kg(-1) energy density) and a maximum energy density of 37 Wh kg(-1) (with 74 W kg(-1)power density).
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