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Title: (Ni,Co)Se2/NiCo-LDH core/shell structural electrode with the cactus-like (Ni,Co)Se2 core for asymmetric supercapacitors
Authors: Li, Xin
Wu, Haijun
Guan, Cao
Elshahawy, Abdelnaby M.
Dong, Yangtao
Pennycook, Stephen J.
Wang, John
Keywords: Engineering::Materials
Issue Date: 2019
Source: Li, X., Wu, H., Guan, C., Elshahawy, A. M., Dong, Y., Pennycook, S. J. & Wang, J. (2019). (Ni,Co)Se2/NiCo-LDH core/shell structural electrode with the cactus-like (Ni,Co)Se2 core for asymmetric supercapacitors. Small, 15(3), 1803895-.
Project: MOE2016-T2-2-138
Journal: Small
Abstract: Supercapacitors (SCs) have been widely studied as a class of promising energy-storage systems for powering next-generation E-vehicles and wearable electronics. Fabricating hybrid-types of electrode materials and designing smart nanoarchitectures are effective approaches to developing high-performance SCs. Herein, first, a Ni-Co selenide material (Ni,Co)Se2 with special cactus-like structure as the core, to scaffold the NiCo-layered double hydroxides (LDHs) shell, is designed and fabricated. The cactus-like structural (Ni,Co)Se2 core, as a highly conductive and robust support, promotes the electron transport as well as hinders the agglomeration of LDHs. The synergistic contributions from the two types of active materials together with the superior properties of the cactus-like nanostructure enable the (Ni,Co)Se2/NiCo-LDH hybrid electrode to exhibit a high capacity of ≈170 mA h g−1 (≈1224 F g−1), good rate performance, and long durability. The as-assembled (Ni,Co)Se2/NiCo-LDH//PC (porous carbon) asymmetric supercapacitor (ASC) with an operating voltage of 1.65 V delivers a high energy density of 39 W h kg−1 at a power density of 1650 W kg−1. Therefore, the cactus-like core/shell structure offers an effective pathway to engineer advanced electrodes. The assembled flexible ASC is demonstrated to effectively power electronic devices.
ISSN: 1613-6810
DOI: 10.1002/smll.201803895
Rights: © 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
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