TY - JOUR
T1 - Phosphate ions interfacial drift layer to improve the performance of CoFe−Prussian blue hematite photoanode toward water splitting
AU - Khan, Abdul Zeeshan
AU - Kandiel, Tarek A.
AU - Abdel-Azeim, Safwat
AU - Jahangir, Tahir Naveed
AU - Alhooshani, Khalid
N1 - KAUST Repository Item: Exported on 2022-05-25
Acknowledgements: The authors acknowledge the support provided by the Deanship of Scientific Research (DSR) at King Fahd University of Petroleum & Minerals (KFUPM) through Project No. DF201010. S. A. thanks the Supercomputer Shaheen at King Abdullah University of Science & Technology (KAUST) in Thuwal, Saudi Arabia, for using its computational resources.
This publication acknowledges KAUST support, but has no KAUST affiliated authors.
PY - 2021/12/21
Y1 - 2021/12/21
N2 - 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 VRHE. 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.
AB - 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 VRHE. 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.
UR - http://hdl.handle.net/10754/678212
UR - https://linkinghub.elsevier.com/retrieve/pii/S0926337321011395
UR - http://www.scopus.com/inward/record.url?scp=85121665527&partnerID=8YFLogxK
U2 - 10.1016/j.apcatb.2021.121014
DO - 10.1016/j.apcatb.2021.121014
M3 - Article
SN - 0926-3373
VL - 304
SP - 121014
JO - Applied Catalysis B: Environmental
JF - Applied Catalysis B: Environmental
ER -
