Topic
Quantum capacitance
About: Quantum capacitance is a research topic. Over the lifetime, 954 publications have been published within this topic receiving 24165 citations.
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TL;DR: In this article, it was found that the introduction of vacancy defects with the doping in silicene can enhance the quantum capacitance of the electrodes of supercapacitors, and the enhancement of capacitance is attributed to the presence of localized states around the Fermi level.
Abstract: Silicene with a buckled atomic layer has double surfaces with a high surface/volume ratio similar to nanocarbon materials and is expected to have potential applications for supercapacitors. With first-principles calculations, it is found that introduction of vacancy defects with the doping in silicene can enhance the quantum capacitance of silicene-based electrodes. The enhancement of quantum capacitance is attributed to the presence of localized states around the Fermi level. Furthermore, the quantum capacitance is observed to increase with the increase of the defect’s concentration. It is also observed that the localized states around the Fermi level lead to spin polarization in the cases of B-doping and S-doping near the vacancies.
34 citations
TL;DR: In this article, the structural, energetic, electronic and capacitance properties of B/N-doped graphdiyne were investigated by first-principles calculations, and the quantum capacitance of 2D carbon electrodes with different doping concentrations was shown to reach a record high value of 4317F/g (6150 F/g).
34 citations
TL;DR: In this article, the transport properties of monolayer graphene with a laterally modulated potential profile were investigated, employing striped top gate electrodes with spacings of 100 to 200 nm.
Abstract: We report on transport properties of monolayer graphene with a laterally modulated potential profile, employing striped top gate electrodes with spacings of 100 to 200 nm. Tuning of top and back gate voltages gives rise to local charge carrier density disparities, enabling the investigation of transport properties either in the unipolar ($n{n}^{\ensuremath{'}}$) or the bipolar ($n{p}^{\ensuremath{'}}$) regime. In the latter, pronounced single- and multibarrier Fabry-P\'erot (FP) resonances occur. We present measurements of different devices with different numbers of top gate stripes and spacings. The data are highly consistent with a phase coherent ballistic tight-binding calculation and quantum capacitance model, whereas a superlattice effect and modification of band structure can be excluded.
34 citations
TL;DR: In this article, the authors evaluate the capacitive performance of a (6,6) carbon nanotube (CNT) in [BMIM][PF6] ionic liquid (IL), with particular attention to the relative contributions of the electric double layer (EDL) capacitance at the CNT/IL interface and the quantum capacitance (CQ).
Abstract: Motivated by promising demonstrations of carbon nanotube (CNT) electrodes in supercapacitors, we evaluate the capacitive performance of a (6,6) CNT in [BMIM][PF6] ionic liquid (IL), with particular attention to the relative contributions of the electric double layer (EDL) capacitance (CD) at the CNT/IL interface and the quantum capacitance (CQ) of the CNT. Our classical molecular dynamics simulations reveal that the use of the CNT improves CD when compared to planar graphene, which we discuss in terms of how the electrode curvature affects both the electric field strength and IL packing density. In addition, according to density functional theory calculations, the CQ of the CNT is constant and significantly larger than that of graphene near the Fermi level, which is a consequence of the larger number of available electron states in the CNT. Our study also shows that the relative performance of the CNT- and graphene-based electrodes can be a strong function of applied voltage, which we attribute to the shifting contributions of CQ and CD.
34 citations
01 Jan 2006
34 citations