4.8 Article

A perpendicular micro-hole array for efficient ion transport in a thick, dense MoS2-based capacitive electrode

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ENERGY STORAGE MATERIALS
卷 60, 期 -, 页码 -

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ELSEVIER
DOI: 10.1016/j.ensm.2023.102843

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Volumetric capacitance; Energy density; Supercapacitor; High thickness; 2D materials

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Researchers used a micro-stamping method to create a perpendicular micro-hole array in a thick, dense MoS2-based electrode, improving the efficiency of ion transport in 2D nanosheet-based films. The electrode exhibited high capacity, density, and conductivity, making it suitable for high-capacity supercapacitors.
Two-dimensional (2D) nanosheets with a high electrochemical capacitance, density, and electrical conductivity are promising for assembling thick and dense films for supercapacitors with a high volumetric energy density. However, 2D nanosheet-based films with cascading nanochannel networks are not ideal for efficient ion transport due to the tortuous pathways. We used a micro-stamping method to create a perpendicular micro-hole array in a thick, dense MoS2-based electrode without lowering its density. Our nuclear magnetic resonance measurement and computational simulations reveal that the micro-hole array can serve as ion reservoirs and provide shortcuts in the cascading nanochannel network, greatly improving the ion accessibility to MoS2-based electrodes in both the adsorption and charging processes. A MoS2-based film electrode with 2-3 times the density of a conventional carbon electrode, shows almost thickness independent capacitance performance with a mass loading up to 18.6 mg cm-2. The electrode has a volumetric capacitance of 469.5 F cm-3 and the assembled device a volumetric energy density of 80.5 Wh L-1 in an ionic liquid electrolyte. This micro-stamping strategy is easy to scale up and may pave the way for the development of 2D materials-based compact energy storage systems.

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