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Perovskite oxides, renowned for their adaptable structure and optoelectronic characteristics, hold significant potential for applications in catalysis and photoelectrochemical processes. This research investigates the preparation of praseodymium iron oxide (PrFeO3) by spin coating and the impact of incorporating a calcium (Ca) dopant on its photoelectrochemical efficacy as photocathodes. Spin coating of a polymer containing sol‐gel yielded thin films with uniform morphology and porosity, facilitating effective semiconductor/electrolyte interactions, as characterised by scanning electron microscopy analyses. Evaluation of transient photocurrent responses revealed that introducing Ca at a 5 at% doping level significantly enhanced the photoelectrochemical activity of PrFeO3, resulting in an optimal photocurrent of ‐124 µA cm‐2 at +0.43 VRHE under simulated sunlight conditions. This enhancement was accompanied by an incident photon‐to‐current efficiency of 3.8% at +0.43 VRHE and 350 nm, along with an onset potential of +1.1 VRHE. Ultraviolet and visible spectroscopy analyses indicated an increase in light absorption capabilities in the Ca‐doped films and a noticeable reduction in bandgap compared to the undoped counterparts, further supported by incident photon‐to‐current efficiency measurements. The findings underscore the significant role of dopants in augmenting the photocurrent performance of stable perovskite oxides, highlighting their potential in advancing photon conversion technologies.This article is protected by copyright. All rights reserved.
Perovskite oxides, renowned for their adaptable structure and optoelectronic characteristics, hold significant potential for applications in catalysis and photoelectrochemical processes. This research investigates the preparation of praseodymium iron oxide (PrFeO3) by spin coating and the impact of incorporating a calcium (Ca) dopant on its photoelectrochemical efficacy as photocathodes. Spin coating of a polymer containing sol‐gel yielded thin films with uniform morphology and porosity, facilitating effective semiconductor/electrolyte interactions, as characterised by scanning electron microscopy analyses. Evaluation of transient photocurrent responses revealed that introducing Ca at a 5 at% doping level significantly enhanced the photoelectrochemical activity of PrFeO3, resulting in an optimal photocurrent of ‐124 µA cm‐2 at +0.43 VRHE under simulated sunlight conditions. This enhancement was accompanied by an incident photon‐to‐current efficiency of 3.8% at +0.43 VRHE and 350 nm, along with an onset potential of +1.1 VRHE. Ultraviolet and visible spectroscopy analyses indicated an increase in light absorption capabilities in the Ca‐doped films and a noticeable reduction in bandgap compared to the undoped counterparts, further supported by incident photon‐to‐current efficiency measurements. The findings underscore the significant role of dopants in augmenting the photocurrent performance of stable perovskite oxides, highlighting their potential in advancing photon conversion technologies.This article is protected by copyright. All rights reserved.
Gd0.2Ce0.8O 2−δ (GDC) porous backbone infiltration with La0.6Sr0.4CoO3−δ (LSC), PrOx and LSC: PrOx as a composite oxygen electrode for intermediate solid oxide cells are conducted within the scope of this work. Samples were characterized using scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), and electrochemical impedance spectroscopy (EIS). A uniform distribution of the infiltrated material inside the backbone and at the electrolyte-backbone interface was achieved. EIS measurements on the prepared symmetrical samples showed electrode polarization resistance (Rp) values of 0.029 Ω.cm², 0.23 Ω.cm², and 0.44 Ω.cm² for LSC, LSC: PrOx, and PrOx at 600 °C, respectively. Long-term stability measurements at 600 °C for 100 h showed a slight increase in polarization resistance during the measurement period. Fuel cell measurements of commercial cells (Elcogen) with porous oxygen electrode consisting of GDC infiltrated with LSC showed an increase in power density compared to the reference cell with a value of 0.53 W.cm− 2 obtained at 600 °C. It is proven that infiltration via polymeric precursor into porous scaffolds as backbone oxygen electrode layer is effective and convenient method to develop high performance and stable solid oxide cells.
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