Phosphate ions interfacial drift layer to improve the performance of CoFe−Prussian blue hematite photoanode toward water splitting

Abdul Zeeshan Khan; Tarek A. Kandiel; Safwat Abdel-Azeim; Tahir Naveed Jahangir; Khalid Alhooshani

doi:10.1016/j.apcatb.2021.121014

Phosphate ions interfacial drift layer to improve the performance of CoFe−Prussian blue hematite photoanode toward water splitting

Abdul Zeeshan Khan, Tarek A. Kandiel, Safwat Abdel-Azeim, Tahir Naveed Jahangir, Khalid Alhooshani

Research output: Contribution to journal › Article › peer-review

34 Scopus citations

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 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.

Original language	English (US)
Pages (from-to)	121014
Journal	Applied Catalysis B: Environmental
Volume	304
DOIs	https://doi.org/10.1016/j.apcatb.2021.121014
State	Published - Dec 21 2021
Externally published	Yes

Bibliographical note

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.

ASJC Scopus subject areas

General Environmental Science
Catalysis
Process Chemistry and Technology

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1016/j.apcatb.2021.121014

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title = "Phosphate ions interfacial drift layer to improve the performance of CoFe−Prussian blue hematite photoanode toward water splitting",

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 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.",

author = "Khan, {Abdul Zeeshan} and Kandiel, {Tarek A.} and Safwat Abdel-Azeim and Jahangir, {Tahir Naveed} and Khalid Alhooshani",

note = "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.",

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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.

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JO - Applied Catalysis B: Environmental

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ER -

Phosphate ions interfacial drift layer to improve the performance of CoFe−Prussian blue hematite photoanode toward water splitting

Abstract

Bibliographical note

ASJC Scopus subject areas

UN SDGs

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