TY - JOUR
T1 - High-Performance Sodium-Ion Hybrid Supercapacitor Based on Nb2O5@Carbon Core–Shell Nanoparticles and Reduced Graphene Oxide Nanocomposites
AU - Lim, Eunho
AU - Changshin, Jo
AU - Kim, Min Su
AU - Kim, Mok Hwa
AU - Chun, Jinyoung
AU - Kim, Haegyeom
AU - Park, Jongnam
AU - Roh, Kwang Chul
AU - Kang, Kisuk
AU - Yoon, Songhun
AU - Lee, Jinwoo
N1 - Publisher Copyright:
© 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
PY - 2016/6/7
Y1 - 2016/6/7
N2 - Sodium-ion hybrid supercapacitors (Na-HSCs) have potential for mid- to large-scale energy storage applications because of their high energy/power densities, long cycle life, and the low cost of sodium. However, one of the obstacles to developing Na-HSCs is the imbalance of kinetics from different charge storage mechanisms between the sluggish faradaic anode and the rapid non-faradaic capacitive cathode. Thus, to develop high-power Na-HSC anode materials, this paper presents the facile synthesis of nanocomposites comprising Nb2O5@Carbon core–shell nanoparticles (Nb2O5@C NPs) and reduced graphene oxide (rGO), and an analysis of their electrochemical performance with respect to various weight ratios of Nb2O5@C NPs to rGO (e.g., Nb2O5@C, Nb2O5@C/rGO-70, -50, and -30). In a Na half-cell configuration, the Nb2O5@C/rGO-50 shows highly reversible capacity of ≈285 mA h g−1 at 0.025 A g−1 in the potential range of 0.01–3.0 V (vs Na/Na+). In addition, the Na-HSC using the Nb2O5@C/rGO-50 anode and activated carbon (MSP-20) cathode delivers high energy/power densities (≈76 W h kg−1 and ≈20 800 W kg−1) with a stable cycle life in the potential range of 1.0–4.3 V. The energy and power densities of the Na-HSC developed in this study are higher than those of similar Li- and Na-HSCs previously reported.
AB - Sodium-ion hybrid supercapacitors (Na-HSCs) have potential for mid- to large-scale energy storage applications because of their high energy/power densities, long cycle life, and the low cost of sodium. However, one of the obstacles to developing Na-HSCs is the imbalance of kinetics from different charge storage mechanisms between the sluggish faradaic anode and the rapid non-faradaic capacitive cathode. Thus, to develop high-power Na-HSC anode materials, this paper presents the facile synthesis of nanocomposites comprising Nb2O5@Carbon core–shell nanoparticles (Nb2O5@C NPs) and reduced graphene oxide (rGO), and an analysis of their electrochemical performance with respect to various weight ratios of Nb2O5@C NPs to rGO (e.g., Nb2O5@C, Nb2O5@C/rGO-70, -50, and -30). In a Na half-cell configuration, the Nb2O5@C/rGO-50 shows highly reversible capacity of ≈285 mA h g−1 at 0.025 A g−1 in the potential range of 0.01–3.0 V (vs Na/Na+). In addition, the Na-HSC using the Nb2O5@C/rGO-50 anode and activated carbon (MSP-20) cathode delivers high energy/power densities (≈76 W h kg−1 and ≈20 800 W kg−1) with a stable cycle life in the potential range of 1.0–4.3 V. The energy and power densities of the Na-HSC developed in this study are higher than those of similar Li- and Na-HSCs previously reported.
KW - core–shell nanoparticles
KW - NbO
KW - reduced graphene oxide
KW - sodium-ion hybrid supercapacitors
KW - ultracapacitors
UR - http://www.scopus.com/inward/record.url?scp=84979486605&partnerID=8YFLogxK
U2 - 10.1002/adfm.201505548
DO - 10.1002/adfm.201505548
M3 - Article
AN - SCOPUS:84979486605
SN - 1616-301X
VL - 26
SP - 3711
EP - 3719
JO - Advanced Functional Materials
JF - Advanced Functional Materials
IS - 21
ER -