Phosphate ions interfacial drift layer to improve the performance of CoFe-Prussian blue hematite photoanode toward water splitting
Khan, Abdul Zeeshan 1Kandiel, Tarek. A. 1Abdel-Azeim, Safwat 2Jahangir, Tahir Naveed 1Alhooshani, Khalid1
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作者信息
1. King Fahd Univ Petr & Minerals KFUPM
2. Coll Petr Engn & Geosci CPG KFUPM
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Abstract
Charge recombination at the surface of hematite photoanode is among the main issues that diminish its photoelectrochemical (PEC) water splitting efficiency. Herein, we address this issue by anchoring phosphate ions (Pi) layer between hematite's surface and CoFe-Prussian blue analogue (CoFe-PBA) water oxidation catalyst (WOC). The PEC results revealed that the Pi interfacial layer is crucial for boosting the PEC activity of CoFe-PBA/hematite photoanode. It improves the activity by 2.9-fold at 1.23 V-RHE. The analysis of time and frequency-resolved results revealed that the synergy between the Pi layer and CoFe-PBA catalyst prolongs the photogenerated holes lifetime, reduces their charge transfer resistance, and suppresses the surface recombination. The DFT simulations suggested that the Pi interfacial layer drifts the electrostatic potential of the hematite's surface toward more negative potential and thus facilities the diffusion of the photogenerated holes toward the hematite/CoFe-PBA/electrolyte interfaces making them dynamically apposite to oxidize water on CoFe-PBA WOC.
Key words
Hematite Photoanodes/Prussian blue analogue (PBA) OER catalyst/Phosphate ions (Pi) interfacial layer/IMPS/MODULATED PHOTOCURRENT SPECTROSCOPY/OXYGEN EVOLUTION/BIVO4 PHOTOANODES/SURFACE-STATES/OXIDATION/TIO2/HEXACYANOFERRATE/ELECTRODES/MORPHOLOGY/NANOTUBES
NSTL
Elsevier