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MnCo 2 O 4 /Au was investigated as an electrocatalyst for the oxygen reduction and evolution in alkaline media. Polarization curves showed an unprecedented activity for the oxygen reduction due to a synergistic effect between MnCo 2 O 4 and Au, involving Co II /Co III -Mn III /Mn IV , as revealed by in situ X-ray absorption near edge structure (XANES). Additionally, results showed favorable interaction between the oxide and Au, which enhanced the activity for the oxygen evolution reaction.doi:10.5935/0103-5053.20150232 fatcat:t5u46o7ox5edloph2dbv7p57o4