Khan, Irfan and Benkó, Timea and Horváth, Anita and Shen, S. and Su, J. and Wang, Y. and Horváth, Zsolt Endre and Németh, Miklós László and Czigány, Zsolt and Zámbó, Dániel and Pap, József Sándor (2024) Photoelectrochemical water splitting by hematite boosted in a heterojunction with B-doped g-C3N4 nanosheets and carbon nanotubes. JOURNAL OF MATERIALS CHEMISTRY A, 12 (30). pp. 19247-19258. ISSN 2050-7488
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Abstract
Here, we effectively layered economically viable pyrolytic carbon nanotubes (p-CNTs) as solid-state mediators to accelerate the charge carrier transfer between hematite (α-Fe2O3) and boron-doped graphitic carbon nitride (B-C3N4). This synergistic combination leads to higher photoelectrochemical water splitting performance with a photoanodic current density of 2.85 mA cm−2, which is a 4.1-fold enhancement compared to pristine α-Fe2O3 and the O2 evolution rate detected was 22.70 μmol h−1 cm−2 with a Faraday efficiency of ∼98% at 1.7 VRHE. Mott–Schottky analysis confirms the highest donor density of 55.7 × 1019 cm−3 for the α-Fe2O3/B-C3N4/p-CNT photoanode, compared to α-Fe2O3 and α-Fe2O3/B-C3N4. Superstructuring the B-C3N4 and p-CNT onto pristine α-Fe2O3 enhances the charge separation and transfer efficiencies, and moreover mitigates recombination losses. DFT calculations suggest the type II charge transfer mechanism switched to an enhanced Z-scheme type by simple deposition of p-CNT on the α-Fe2O3/B-C3N4 heterojunction. Achieving such cost-effective, highly efficient hematite-based photoanodes offers an opportunity to fabricate tandem photoelectrochemical devices for low-cost solar fuel production.
Item Type: | Article |
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Subjects: | Q Science / természettudomány > QD Chemistry / kémia |
SWORD Depositor: | MTMT SWORD |
Depositing User: | MTMT SWORD |
Date Deposited: | 09 Sep 2024 06:48 |
Last Modified: | 09 Sep 2024 06:48 |
URI: | https://real.mtak.hu/id/eprint/204465 |
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