Synthesis of nanostructured rare earth metal doped Sr2TiFeO6 (STF) double perovskites electrocatalysts for water splitting reactions

Abstract

The electrochemical water splitting is well-thought-out as a clean source to produce water splitting and for the use of different energy applications. But there is a still problem is present to produce the hydrogen on the large scale, the problem is mainly concern with the stability and efficiency of the electrocatalysts and also in Hydrogen Evolution Reaction in acidic media as well as different kinetics and values of high overpotential of four-electron transfer Oxygen Evolution Reaction OER. Thus, this research based on electrocatalysts that helps to reduce the overpotential for the OER/HER. The synthesis of double perovskites electrocatalysts for high stability and the effective activity towards electrolysis of water was important for the production of hydrogen. In this study, pure (Sr2TiFO6) STF based double perovskites and STF/Pr doped electrocatalysts by doping the rare earth metal praseodymium Pr at A-site and B-site were made by sol-gel method. The Sr2TiFO6 (STF) based electrocatalysts was characterized by XRD, SEM and FTIR and electrochemical performance was analyzed by using 3-electrode testing in alkaline media. The results of STF Sr2TiFO6 (STF) based double perovskites towards OER (Oxygen Evolution Reaction) and HER (Hydrogen Evolution Reaction) was very remarkable. The OER results showed overpotential of 230 at current density of 10mA/cm2 and Tafel slope was 139 mV dec1 . For HER, there was overpotential of 194mV at current density of 10mA/cm2 and Tafel slope was 126 mV dec-1 . Moreover, it exhibits notable results of durability for 24 hours. With the help of Sr2TiFO6 (STF) based double perovskites electrocatalysts, we can develop more efficient process and enhance the activity towards water splitting reactions.