Enhancing the electro catalytic activity of manganese ferrite through cerium substitution for oxygen evolution in KOH solutions

Overview

Title: 

Enhancing the electro catalytic activity of manganese ferrite through cerium substitution for oxygen evolution in KOH solutions

Abstract: 

Alkaline water electrolysis (AWE) is the simplest way of producing hydrogen, an attractive fuel for the future. In view of their cost-effectiveness and durability, non-noble metal oxides are promising catalysts for AWE. Here, we studied the effect of Ce substitution on the OER activity of manganese ferrite. Ce substituted MnFe2O4 (0 <= x <= 0.8) was synthesized by a combustion method. Characterization techniques such as SEM, XRD, EDAX and XPS were used to analyse the surface morphology and the chemical composition of CexMnFe2-xO4. Substitution of Ce3+ in the cubic lattice of MnFe2O4 increases the conductivity of CexMnFe2-xO4, which results in the negative shift in the OER onset potential. Among all the Ce3+ substituted manganese ferrites, Ce0.2MnFe1.8O4 was found to be more active for OER in terms of current and stability. Notably, Ce0.2MnFe1.8O4 affords a current density of 10 mA cm(-2) at a small overpotential of similar to 310 mV and a Tafel slope value of 31 mV per decade, these values are comparable to the well-investigated non-noble metal oxides.

Authors: 

T. Pandiarajan, S. Ravichandran, L. J. Berchmans

DOI: 

Journal: 

Rsc Advances

Year: 

2014

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