Visible-light driven oxygen evolution over CoTiO3 perovskites via a modified Pechini method: impact of humidity on their phase composition

Abstract

A set of CoTiO₃ materials were synthesized using a modified Pechini method under different relative humidity conditions. Humidity alters the structural composition of the final materials via changing the coordination and/or oxidation state of the cobalt ion (Co²⁺) in the precursor solution. The amount of CoTiO₃ present in the composite material was found to be the key factor for the variation in the amount of oxygen evolved.