Ghosh, Srabanti and Pal, Sourabh and T, Maiyalagan and Allu, Amarnath R. and Naskar, Milan Kanti (2024) Dual Active Site Mediated Photocatalytic H2 Evolution Through Water Splitting using CeO2/PPy/BFO Double Heterojunction Catalyst. ACS Applied Energy Materials. ISSN 2574-0962
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Photocatalytic water splitting generates hydrogen from water and sunlight, but one bottleneck for widespread usage is the poor performance of semiconductor photocatalyst materials. Manipulating the surface of a catalytic material by introducing different components can tune phase composition and extend the catalytic activity by delayed charge recombination, superior charge transfer, and enhanced light harvesting. A double heterojunction fabricated using CeO2 nanoparticles directly deposited on polypyrrole (PPy) nanofibers and then Bi2Fe4O9 (BFO) nanosheets have been grown on CeO2/PPy with a significant improvement in visible light absorption. A high photocurrent density of 5.5 µA cm−2 with more negative Flat band potential (−0.47 V vs Ag/AgCl) has been obtained for CeO2/PPy/BFO compared to single heterojunction CeO2/PPy (~1.9 µA cm−2 and −0.42 V vs Ag/AgCl). Lowering of charge transfer resistance (Rct) values from 612 kΩ, to 488 kΩ and 415 kΩ andlonger charge carrier lifetimesare of 4.8, 5.8, and 7.3 µs for CeO2, CeO2/PPy and CeO2/PPy/BFO respectively implying facile charge carrier separation with enhanced interfacial band bending after construction of double heterojunctions.Remarkably, CeO2/PPy and CeO2/PPy/BFO demonstrated 32and 71 times higher H2 generation, respectively than pure CeO2. Based on the possible band edge positions of semiconductors, a double heterojunction n-n-Z−Scheme charge transfer pathway has been proposed. Our demonstration provides a paradigm to improve catalytic performance for water splitting through surface engineering of semiconductor photocatalysts.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | Conducting polymer nanostructure, metal oxide, double heterojunction, Z scheme heterostructures, photocatalytic water splitting |
| Subjects: | Environment and Pollution |
| Divisions: | Fuel Cell and Battery |
| Depositing User: | Ms Upasana Sahu |
| Date Deposited: | 02 May 2024 10:59 |
| Last Modified: | 02 May 2024 10:59 |
| URI: | http://cgcri.csircentral.net/id/eprint/5674 |
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