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Fabrication of VB2/Air Cells for Electrochemical Testing
Published on: August 5, 2013
Pt nanoparticle-embedded NiFe-LDH nanoflowers as a high-performance cathode for rechargeable aqueous zinc-air
Meilin Nie1,2, Dapeng Liu1,2, Zerui Fu1,2
1Hangzhou International Innovation Institute, Beihang University, Hangzhou 311115, P. R. China. liudp@buaa.edu.cn.
Abstract:
Rechargeable aqueous Zn-air batteries (ZABs) are promising due to their high energy density (1370 Wh kg-1), safety, and environmental friendliness, but their development is hindered by slow oxygen redox kinetics. Herein, we have synthesized Pt nanoparticle-embedded NiFe layered double hydroxide (Pt/NiFe-LDH) nanoflowers via an in situ reduction method. As a cathode, Pt/NiFe-LDH can exhibit remarkable bifunctional activity with an impressive ΔE value of 0.631 V, which achieves a half-wave potential of 0.861 V for the oxygen reduction reaction and a low overpotential of 262 mV at 10 mA cm-2 for the oxygen evolution reaction, surpassing commercial Pt/C and RuO2 benchmarks. When deployed in ZABs, the Pt/NiFe-LDH cathode delivers remarkable cycling stability over 1300 h.

