Research On The Photoelectrocatalytic Performance Of Nanostructured Ferro-based Oxide

With the development of society,the demand of energy is growing.Due to the non-renewability of traditional energy and its environmental pollution,the research of new renewable clean energy is imminent,in which solar hydrogen production and fuel cell are important for the conversion and utilization of new energy sources.Noted that the core of these energy conversion technologies is the development of highly efficient catalysts.For better practical applications,the catalysts usually require high stability,high activity and low cost.the ferro-based oxide have attracted widespread attention due to its superior visible light absorption,chemical catalytic activity and low cost.And the photo-and electrocatalysis performance of the ferro-based oxide will be discussed below.1)The structure-controllable hematite nanorod arrays were synthesized by hydrothermal method.Because of the poor conductivity,short carrier lifetime,the photoelctrocatalytic performance of the hematite was poor.In order to modify the performance,the hematite was doped with Sn and Co elements by a graded internal and external doping method.It is shown that the photocurrent density increases from 0.31mA/cm² to 1.25 mA/cm²,which also suppresses the overpotential increase caused by Sn doping.The electrochemical characterization showed that the doping of Sn significantly increased the carrier concentration and Co doping effectively enhanced the surface catalytic activity.The synergistic effect of the Sn and Co makes the photocatalytic performance significantly improved.2)The use of organic phase hydrothermal method to prepare ferro-based spinel nanoparticle cheap metal oxides as electrocatalysts for the study of the electrocatalytic properties of oxygen reduction of fuel cells.The half-wave potential,onset potential and reaction mechanism of ferro-based spinel oxides were studied.Meanwhile,a small amount of Pt was coated on the catalyst by the atomic layer depositio.And the half-wave and onset potential increased by¹81 and 193 mV,respectively.By replacing the Fe sites with transition metals,MnFe₂O₄ showed the best oxygen reduction performance.This study shows that the doping and surface modification of ferro-based oxides can effectively improve their photo and electrocatalytic properties,and they have great potential for application in photocatalytic hydrogen production and fuel cell applications.