Quantum Capacitance Modifies Interionic Interactions in Semiconducting Nanopores
TL;DR: In this paper, it was shown that ion-ion interactions in carbon nanotubes and graphene slit pores actually decay algebraically with ion separation, which suggests a new avenue of capacitance optimization based on tuning the electronic structure of a pore.
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Abstract: Nanopores made with low-dimensional semiconducting materials, such as carbon nanotubes and graphene slit pores, are used in supercapacitors. For modelling purposes, it is often assumed that such pores screen ion-ion interactions like metallic pores, i.e. that screening leads to an exponential decay of the interaction potential with ion separation. By introducing a quantum capacitance that accounts for the density of states in the material, we show that ion-ion interactions in carbon nanotubes and graphene slit pores actually decay algebraically with ion separation. This result suggests a new avenue of capacitance optimization based on tuning the electronic structure of a pore: a marked enhancement in capacitance might be achieved by developing nanopores made with metallic materials or bulk semimetallic materials.
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Citations
Quantification of ion confinement and desolvation in nanoporous carbon supercapacitors with modelling and in situ X-ray scattering
Christian Prehal,Christian Koczwara,Nicolas Jäckel,Nicolas Jäckel,Anna Schreiber,Max Burian,Heinz Amenitsch,Markus Hartmann,Volker Presser,Volker Presser,Oskar Paris +10 more
TL;DR: In this paper, a combination of measured and simulated X-ray scattering data provides compelling evidence of partial desolvation of Cs+ and Cl− ions in water even in mixed micro-mesoporous carbons with average pore size well above 1 nm.
267
Capacitance-Power-Hysteresis Trilemma in Nanoporous Supercapacitors
TL;DR: In this paper, simulations and theoretical analysis are used to determine how to achieve the highest possible capacitance in supercapacitors, which may be used in next-generation energy technologies.
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Controlling Polyelectrolyte Adsorption onto Carbon Nanotubes by Tuning Ion-Image Interactions
TL;DR: The theory suggests a simple strategy to selectively and reversibly functionalize carbon nanotubes on the basis of their electronic structures, which in turn modify the ion-image attraction.
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Tailoring Ti3C2 MXene into Ti3C2Tx, Tx = NO and alloying with M = Al, Ga, In, Tl into MTi3C2NO as electrode materials for super-capacitor devices: Perspective from first-principles density functional theory
TL;DR: Theoretical calculations using a density functional theory (DFT) approach has been utilized to explore the structural, electronic, and optical properties of Ti3C2, Ti3c2Tx, Tx = NO, and its alloys with Group IIIA elements (Al, Ga, In, Tl) as electrode materials for supercapacitor devices as mentioned in this paper .
3
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Ionic liquids in supercapacitors
TL;DR: In this article, the use of ionic liquids (ILs) as electrolytes in supercapacitors is considered, and the advantages as well as challenges related to use of this kind of electrolyte are analyzed.
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Ultrasmall Silver Nanopores Fabricated by Femtosecond Laser Pulses
TL;DR: This approach advances the capability of optical methods in making nanoscale structures with potential applications in areas such as near-field aperture probes, imaging masks, magnetic plasmonic resonances, and biosensing with individual nanopores.
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Evidence for enhanced capacitance and restricted motion of an ionic liquid confined in 2 nm diameter Pt mesopores
TL;DR: The organised nanostructure of mesoporous platinum deposited from the H(I) phase of a lyotropic liquid crystal template contains a regular, hexagonal array of uniform nanometre diameter cylindrical pores, ideal for the investigation of the interfacial capacitance and properties of ionic liquids confined within small pores of the type found in the high surface area electrodes favoured for supercapacitors and batteries.
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