Journal
NANO ENERGY
Volume 57, Issue -, Pages 22-33Publisher
ELSEVIER
DOI: 10.1016/j.nanoen.2018.12.011
Keywords
ZnNiCo phosphide nanosheets; Hierarchical architecture; Anion and cation substitution; DFT calculations; Hybrid supercapacitors
Categories
Funding
- National Key R&D Program of China [2018YFB0905400]
- National Natural Science Foundation of China [21703185, 61471307, 51872098, 51425301, U1601214]
- National Materials Genome Project [2016YFB0700600]
- Fundamental Research Funds for the Central Universities (Xiamen University) [20720170042]
- Postgraduate Research & Practice Innovation Program of Jiangsu Province [Kycx18_1122]
- Double-First Class Foundation of Materials and Intelligent Manufacturing Discipline of Xiamen University
- leading Project Foundation of Science Department of Fujian Province [2018H0034]
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Anion and cation substitution is an effective way in modulating electrochemical properties of electrode materials to achieve enhanced performance. Herein, we report our finding in the fabrication of advanced binder-free supercapacitor electrodes of hierarchical anion- (phosphorus-) and cation- (zinc- and nickel-) substituted cobalt oxides (denoted as ZnNiCo-P) architectures assembled from nanosheets grown directly on Ni foam. In contrast to the reference Co-P systems, the as-prepared electrode manifests a markedly improved electrochemical performance with a high specific capacity of similar to 958 C g(-1) at 1 A g(-1) and an outstanding rate capability (787 C g(-1) at 20 A g(-1)) due to its compositional and structural advantages. Density functional theory calculations confirm that the Co species partially replaced by Zn/Ni and O species by P can simultaneously improve the charge transfer behavior and facilitate the OH-adsorption and deprotonation/protonation reaction process. Moreover, an aqueous hybrid supercapacitor based on self-supported ZnNiCo-P nanosheet electrode demonstrates a high energy density of 60.1 Wh kg(-1) at a power density of 960 Wkg(-1), along with a superior cycling performance (89% of initial specific capacitance after 8000 cycles at 10 A g(-1) is retained). These findings offer insights into the rational design of transition metal compounds with multi-components and favorable architectures by manipulating the cations and anions of metal compounds for high-performance supercapacitors.
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