Electrocatalytic activity of CoFe2O4 thin films prepared by AACVD towards the oxygen evolution reaction in alkaline media
journal contributionposted on 05.01.2018, 11:31 authored by Jagdeep Sagu, Diana Mehta, Upul Wijayantha-Kahagala-Gamage
© 2017 The Authors The electrocatalytic behaviour of CoFe 2 O 4 thin films, prepared by aerosol-assisted chemical vapour deposition, towards the oxygen evolution reaction in an alkaline medium is reported. X-ray diffraction and SEM data show that the CoFe 2 O 4 thin films are phase pure and consist of dendrites 0.5–1 μm in diameter rising from the surface with heights ranging from 1 to 3 μm. The CoFe 2 O 4 thin films exhibited an overpotential of 490 mV at a current density of 10 mA cm − 2 , and a Tafel slope of 54.2 mV dec − 1 . Taking into account the electrochemically active surface area, the intrinsic activity of CoFe 2 O 4 was found to be 1.75 mA cm − 2 real at an overpotential of 490 mV. The CoFe 2 O 4 thin films were highly stable and were capable of maintaining catalytic activity for at least 12 h.
JS and KGUW acknowledge the support from UK EPSRC Joint University Industry Consortium for Energy (Materials) and Devices Hub (EP/R023662/1.