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Facile Synthesis of Nb2O5@Carbon Core-Shell Nanocrystals with Controlled Crystalline Structure for High-Power Anodes in Hybrid SupercapacitorsHighly Cited Paper

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Title
Facile Synthesis of Nb2O5@Carbon Core-Shell Nanocrystals with Controlled Crystalline Structure for High-Power Anodes in Hybrid Supercapacitors
Author(s)
Lim E.; Jo C.; Kim H.; Kim M.-H.; Mun Y.; Chun J.; Ye Y.; Hwang J.; Ha K.-S.; Kwang Chul Roh; Kisuk Kang; Yoon S.; Lee J.
Subject
controlled crystal structures, ; core-shell nanostructures, ; high-power anodes, ; hybrid supercapacitors, ; orthorhombic Nb<inf>2</inf>O<inf>5</inf> nanocrystals
Publication Date
2015-07
Journal
ACS NANO, v.9, no.7, pp.7497 - 7505
Publisher
AMER CHEMICAL SOC
Abstract
Hybrid supercapacitors (battery-supercapacitor hybrid devices, HSCs) deliver high energy within seconds (excellent rate capability) with stable cyclability. One of the key limitations in developing high-performance HSCs is imbalance in power capability between the sluggish Faradaic lithium-intercalation anode and rapid non-Faradaic capacitive cathode. To solve this problem, we synthesize Nb2O5@carbon core-shell nanocyrstals (Nb2O5@C NCs) as high-power anode materials with controlled crystalline phases (orthorhombic (T) and pseudohexagonal (TT)) via a facile one-pot synthesis method based on a water-in-oil microemulsion system. The synthesis of ideal T-Nb2O5 for fast Li+ diffusion is simply achieved by controlling the microemulsion parameter (e.g., pH control). The T-Nb2O5@C NCs shows a reversible specific capacity of ∼180 mA h g-1 at 0.05 A g-1 (1.1-3.0 V vs Li/Li+) with rapid rate capability compared to that of TT-Nb2O5@C and carbon shell-free Nb2O5 NCs, mainly due to synergistic effects of (i) the structural merit of T-Nb2O5 and (ii) the conductive carbon shell for high electron mobility. The highest energy (∼63 W h kg-1) and power (16528 W kg-1 achieved at ∼5 W h kg-1) densities within the voltage range of 1.0-3.5 V of the HSC using T-Nb2O5@C anode and MSP-20 cathode are remarkable. © 2015 American Chemical Society
URI
https://pr.ibs.re.kr/handle/8788114/2340
DOI
10.1021/acsnano.5b02601
ISSN
1936-0851
Appears in Collections:
Center for Nanoparticle Research(나노입자 연구단) > 1. Journal Papers (저널논문)
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