Journal
CHEM
Volume 4, Issue 9, Pages 2168-2179Publisher
CELL PRESS
DOI: 10.1016/j.chempr.2018.06.007
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Funding
- National Natural Science Foundation of China [21601011, 21521005]
- National Key Research and Development Programme [2017YFA0206804]
- Fundamental Research Funds for the Central Universities [buctrc201506, buctylkxj01]
- Higher Education and High-Quality University [PY201610]
- World-Class University [PY201610]
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New types of cation storage materials would show tremendous potential in the development of high-performance rechargeable energy storage devices. Herein, we develop layered double hydroxides (LDHs) as promising cation supercapacitor materials in aqueous and neutral operation, via an effective electrochemical activation strategy, for a reversible intercalation of a wide range of metal cations. These activated LDH materials exhibit overwhelming metal-ion storage capacities in aqueous electrolytes as a result of the phase transformation of LDH (repulsive to cations) to hydrogen-vacancy-enriched LDH (LDH-H-V, attractive to cations) induced by the electrochemical activation process. The activated LDH-H-V phase provides a two-dimensional open channel with abundant active sites (H-V) for a reversible intercalation of metal ions, accounting for the significantly enhanced energy storage performance. This vacancy-induced cation intercalation into LDHs builds up a general approach for developing earth-abundant transition-metal resources as a prospective energy storage material toward a large variety of cation supercapacitors.
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