Abstract
A novel alumina/nano-carbon networks (NCN) composite electrode material was fabricated by combination of gelcasting and reduction–sintering method. The electrocatalytic reduction of dissolved oxygen on this alumina/NCN electrode in 35 wt.% potassium hydroxide solution was investigated using electrochemical methods. The results showed that the electrocatalytic activity of the new electrode was higher than that of a commercial graphite. This higher electrocatalytic activity can be attributed to the presence of pyrolyzed nano-carbon networks in composite matrix. These networks provided very high porosity and electrochemical surface area to alumina ceramic matrix, which are helpful in decreasing the polarization of electrodes by improving the discharge capacity at high rates required by oxygen electrode when large current flows through it. The oxygen reduction reaction mechanism on the nano-composite electrode was discussed. The electrode displayed heterogeneous catalytic activity toward decomposition of intermediate HO 2 - due to the presence of alumina particles mixed with pyrolyzed nano-carbon in the composite matrix.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
