Publication date: 27th March 2025
The global climate crisis requires immediate action to cut emissions and transition to sustainable energy sources. Water splitting for green hydrogen production offers a promising solution to decarbonize industries, strengthen energy security, and support the shift to a low-carbon economy. While much research has focused on the photoanodic side of photoelectrochemical cells, there remains significant potential to further develop high-performance and stable photocathode materials.1 Perovskite oxides have been identified as strong candidates for water splitting due to their inherent stability in air and aqueous solutions, along with their favourable bandgaps for visible light absorption. 2
This study explores the synthesis of a novel material, praseodymium iron oxide (PrFeO3), using a straightforward spin coating method and investigates the impact of calcium (Ca) doping on its photoelectrochemical performance as photocathodes.3
Polymer-templated sol-gel spin coating of PrFeO3 based materials produced thin films with uniform morphology and porosity, improving semiconductor/electrolyte interactions, as confirmed by scanning electron microscopy. Transient photocurrent response analysis revealed that doping PrFeO3 with 5 at% calcium (Ca) significantly boosted its photoelectrochemical activity, achieving a peak photocurrent of -124 µA cm⁻² at +0.43 VRHE under simulated sunlight. This enhancement also included 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.3
These findings emphasize the critical role of dopants in enhancing the photocurrent performance of stable perovskite oxides, showcasing their potential to advance photon conversion technologies and, ultimately, green hydrogen production.
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