کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1286876 | 1497973 | 2014 | 7 صفحه PDF | دانلود رایگان |
• Fabrication and development of a carbon free bifunctional gas diffusion electrode.
• Good stability and overpotentials on cycling at 50 mA cm−2 for >50 cycles.
• Operational up to current densities of 100 mA cm−2.
The fabrication of a gas diffusion electrode (GDE) without carbon components is described. It is therefore suitable for use as a bifunctional oxygen electrode in alkaline secondary batteries. The electrode is fabricated in two stages (a) the formation of a PTFE-bonded nickel powder layer on a nickel foam substrate and (b) the deposition of a NiCo2O4 spinel electrocatalyst layer by dip coating in a nitrate solution and thermal decomposition. The influence of modifications to the procedure on the performance of the GDEs in 8 M NaOH at 333 K is described. The GDEs can support current densities up to 100 mA cm−2 with state-of-the-art overpotentials for both oxygen evolution and oxygen reduction. Stable performance during >50 successive, 1 h oxygen reduction/evolution cycles at a current density of 50 mA cm−2 has been achieved.
Journal: Journal of Power Sources - Volume 259, 1 August 2014, Pages 43–49