Synthesis of spinel-type CoFe and NiFe oxide solid solutions by a simple autocombustion for oxygen evolution electrocatalysis
Paper ID : 1351-ICNS
Authors:
keyvan malaie *
Institute of electrochemistry, Department of chemistry, faculty of science, university of Tehran, Tehran, Iran
Abstract:
The lack of efficient cost-effective electrocatalysts for electro-oxidation of water is by far the most notorious obstacle in the development of electrolyzers. Here, oxygen evolution reaction (OER) electrocatalysts based on spinel-type C–CoFe and C–NiFe oxide nanostructures are prepared by a simple autocombustion reaction between glycine and the metal nitrates. The XRD and FESEM images confirm the formation of nanospherical particles with an inverse spinel phase. The nanopowders were casted on a glassy carbon in order to study their oxygen evolution activity by cyclic voltammetry in 1 M KOH. The investigations show a relationship between composition and activity in both solid solutions. For CoFe oxide an iron content of 20% and for NiFe oxide an iron content of 17% showed the lowest OER overpotential, and hence, the best promise for OER electrocatalysis. Overall, our investigations show that nanostructured CoFe and NiFe oxide solid solutions with tunable composition can be easily prepared with glycine-nitrate autocombustion and with great promise for application in low-cost OER electrocatalysts in alkaline solution.
Keywords:
CoFe oxide, NiFe oxide, nanospinels, oxygen evolution
Status : Abstract Accepted (Oral Presentation)