Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 28, Issue 44, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201803272
Keywords
graphene-guided growth; NiCo-layered double hydroxides; oxygen evolution reaction; supercapacitors; ultrathin nanosheets
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Funding
- National Natural Science Foundation of China [21336001, 51802251]
- China Postdoctoral Science Foundation [2018M631168]
- Fundamental Research Funds for the Central Universities [xjj2018036]
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, Materials Sciences and Engineering Division within the KC22ZH program [DE-AC02-05-CH11231]
- Chinese Scholarship Council [201506060073]
- Office of Science, Office of Basic Energy Sciences, the U.S. Department of Energy [DE-AC02-05CH11231]
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The design and fabrication of 2D nanostructure electrodes with desired electrochemical activities is highly demanded for electrocatalysis and supercapacitors. Herein, the tuned fabrication of ultrathin and tortuous nickel/cobalt-layered double hydroxide (NiCo-LDH) nanosheets via a graphene oxide (GO) surface-confined strategy is reported, yielding nanosheets with a thickness of 1.7-1.8 nm that is duplicated from the graphene oxides in terms of both the lateral size and the shape. It has been found that the C/O functional groups on the GO surface have functioned to promote the oxidation of Co2+ to Co3+, and to transform the beta-phase NiCo-hydroxide (NiCo-OH) into the LDH-phase with tuned homogenous composition and geometry. The ultrathin NiCo-LDH nanosheets mimic the morphology and size of the graphene due to the surface-confined and/or surface-guided growth. The as-obtained NiCo-LDH-graphene (NiCo-LDH-G) nanosheets exhibit a superior electrocatalytic activity for oxygen evolution reaction, evidenced by a small overpotential of 0.337 V (@10 mA cm(-2) in 0.1 m KOH electrolyte), and a high charge storage capability of 1489 F g(-1) as electrodes for supercapacitors. This 2D surface-confined growth strategy may pave a way for the fabrication of ultrathin 2D materials including but not limited to transition metal hydroxides for high-performance electrochemical applications.
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