Electroreduction of oxygen on cobalt- and iron-containing nitrogen-doped carbon aerogelsSarapuu, Ave; Samolberg, Lars; Kreek, Kristiina; Koel, Mihkel; Joost, Urmas; Tammeveski, KaidoBEC 16 : the 6th Baltic Electrochemistry Conference : Electrochemistry of Functional Interfaces and Materials : 15th-17th June 2016, Helsinki, Finland2016 / p. 20