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Bifunctional Oxygen Evolution and Supercapacitor Electrode with Integrated Architecture of NiFe-LDH and Hierarchical Carbon Framework.

08:00 EDT 9th April 2019 | BioPortfolio

Summary of "Bifunctional Oxygen Evolution and Supercapacitor Electrode with Integrated Architecture of NiFe-LDH and Hierarchical Carbon Framework."

Layered double hydroxide with exchangeable interlayer anions is considered as promising electro-active materials for renewable energy technologies. However, the limited exposure of active sites and poor electrical conductivity of hydroxide powder restrict its application. Herein, bifunctional integrated electrode with a 3D hierarchical carbon framework decorated by nickel iron layered double hydroxides (NiFe-LDH) is developed. Conductive carbon nanowire array is introduced not only to provide enough anchoring sites for hydroxide, but also afford continuous pathway for electron transport throughout the entire electrode. The 3D integrated architecture of NiFe-hydroxide and hierarchical carbon framework possesses several beneficial effects including large electrochemical active surfaces, fast electron/mass transport, and enhanced mechanical stability. The as-prepared electrode affords a current density of 10 mA cm-2 at a low overpotential of 269 mV for oxygen evolution reaction (OER) in 1 M KOH. It also offers excellent stability with negligible current decline even after 2000 cycles. Besides, density functional theory (DFT) calculations reveal that the (110) surface of NiFe-LDH is more active than the (003) surface for OER. Furthermore, the electrode shows excellent supercapacitor performance with a high gravimetric capacitance of 1609.6 F g-1 at a current density of 0.2 A g-1. The viability of the as-prepared bifunctional electrode will provide a potential solution of wearable electronics in the near future.

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Name: Nanotechnology
ISSN: 1361-6528
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