Photoelectrochemical properties of doped lanthanum orthoferrites

Abstract

LaFeO3powders doped with Sr (20 mol%) and Cu (0-10-20 mol%) were prepared by citrate auto-combustion synthesis and investigated in terms of crystal structure, morphology, surface area and opticalproperties. All powders showed photocurrent response in the form of a pasted and annealed electrodeand as slurry electrode; the highest value was obtained for undoped orthoferrite calcined at 600◦C.Their physical–chemical properties were related to photoelectrochemical behaviour. The position of thequasi-Fermi level of electrons for all the photocatalysts calcined in the range 600–980◦C is about the samewithin experimental error (between −0.62 and −0.67 V with respect to Ag/AgCl reference electrode, atpH 7). Doping with 20 mol% of strontium did not influence the flat band potential of the powders, whiledoping with copper caused an important and reproducible change in the titration curve, indicating thepresence of intermediate energy states in the samples calcined at 600◦C, but not in those calcined at980◦C

Effect of B-site Co substitution on the structure and magnetic properties of nanocrystalline neodymium orthoferrite synthesized by auto-combustion

“…It is also observed that the particles have a tendency of agglomeration. This phenomenon in orthoferrites has been reported by several researchers [32,33]. The particles are of polycrystalline crystallites.…”

Photocatalytic Degradation of Humic Acids Using LaFeO3

“…LF with a typical ABO 3 -type perovskite structure (A is usually a rare earth and B is a transition metal) has proven to be effective on catalytic reactions owing to its significant properties as high stability and nontoxicity [13,14]. Furthermore, La ferrites, either sole or modified with various doping elements i.e., Cu, Sr, has been extensively investigated by Natali Sora et al [15][16][17][18][19][20][21][22][23][24][25]. Focusing on specific application of La ferrites, reduction in eco-toxic effects of micropollutants was achieved via photocatalytic degradation [26].…”

The influence of chromium substitution on crystal structure and shift of Néel transition in GdFe1−xCrxO3 mixed oxides

“…Lanthanide-transition metal mixed oxides emerged in recent years as potential catalysts [1][2][3], sensors [4][5][6][7] and materials for harvesting of solar energy [8,9]. Two of those examples are the families of lanthanide orthoferrites (LnFeO 3 , where Ln represents a lanthanide trivalent ion) and lanthanide orthochromites (LnCrO 3 ), who may serve as visible light absorbers due to an optical absorption edge situated around 1-2.8 eV [10][11][12][13].…”