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Title: Hierarchical Micro-Nano Sheet Arrays of Nickel–Cobalt Double Hydroxides for High-Rate Ni–Zn Batteries
Authors: Chen, H.
Shen, Z.
Pan, Z. 
Kou, Z. 
Liu, X. 
Zhang, H.
Gu, Q. 
Guan, C.
Wang, J. 
Keywords: hierarchical micro-nano sheet arrays
high rate capability
nickel–cobalt double hydroxides
Ni–Zn batteries
Issue Date: 2019
Publisher: John Wiley and Sons Inc.
Citation: Chen, H., Shen, Z., Pan, Z., Kou, Z., Liu, X., Zhang, H., Gu, Q., Guan, C., Wang, J. (2019). Hierarchical Micro-Nano Sheet Arrays of Nickel–Cobalt Double Hydroxides for High-Rate Ni–Zn Batteries. Advanced Science 6 (8) : 1802002. ScholarBank@NUS Repository.
Rights: Attribution 4.0 International
Abstract: The rational design of nickel-based cathodes with highly ordered micro-nano hierarchical architectures by a facile process is fantastic but challenging to achieve for high-capacity and high-rate Ni–Zn batteries. Herein, a one-step etching–deposition–growth process is demonstrated to prepare hierarchical micro-nano sheet arrays for Ni–Zn batteries with outstanding performance and high rate. The fabrication process is conducted at room temperature without any need of heating and stirring, and the as-grown nickel–cobalt double hydroxide (NiCo-DH) supported on conductive nickel substrate is endowed with a unique 3D hierarchical architecture of micro-nano sheet arrays, which empower the effective exposure of active materials, easy electrolyte access, fast ion diffusion, and rapid electron transfer. Benefiting from these merits in combination, the NiCo-DH electrode delivers a high specific capacity of 303.6 mAh g?1 and outstanding rate performance (80% retention after 20-fold current increase), which outperforms the electrodes made of single Ni(OH)2 and Co(OH)2, and other similar materials. The NiCo-DH electrode, when employed as the cathode for a Ni–Zn battery, demonstrates a high specific capacity of 329 mAh g?1. Moreover, the NiCo-DH//Zn battery also exhibits high electrochemical energy conversion efficiency, excellent rate capability (62% retention after 30-fold current increase), ultrafast charge characteristics, and strong tolerance to the high-speed conversion reaction. © 2019 The Authors. Published by WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Source Title: Advanced Science
ISSN: 2198-3844
DOI: 10.1002/advs.201802002
Rights: Attribution 4.0 International
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