Atomically Altered Hematite for Highly Efficient Perovskite Tandem Water‐Splitting Devices
Abstract
Abstract Photoelectrochemical (PEC) cells are attractive for storing solar energy in chemical bonds through cleaving of water into oxygen and hydrogen. Although hematite (α‐Fe 2 O 3 ) is a promising photoanode material owing to its chemical stability, suitable band gap, low cost, and environmental friendliness, its performance is limited by short carrier lifetimes, poor conductivity, and sluggish kinetics leading to low (solar‐to‐hydrogen) STH efficiency. Herein, we combine solution‐based hydrothermal growth and a post‐growth surface exposure through atomic layer deposition (ALD) to show a dramatic enhancement of the efficiency for water photolysis. These modified photoanodes show a high photocurrent of 3.12 mA cm −2 at 1.23 V versus RHE, (>5 times higher than Fe 2 O 3 ) and a plateau photocurrent of 4.5 mA cm −2 at 1.5 V versus RHE. We demonstrate that these photoanodes in tandem with a CH 3 NH 3 PbI 3 perovskite solar cell achieves overall unassisted water splitting with an STH conversion efficiency of 3.4 %, constituting a new benchmark for hematite‐based tandem systems.
- Authors:
-
- School of Materials Science and Engineering Nanyang Technological University Nanyang Avenue Singapore 639798 Singapore
- Energy Research Institute @NTU, ERI@N, Research Techno Plaza, X-Frontier Block, Level 5 50 Nanyang Drive Singapore 637553 Singapore
- Laboratory of Photonics and Interfaces, Department of Chemistry and Chemical Engineering Swiss Federal Institute of Technology Station 6 1015 Lausanne Switzerland
- Department of Materials Science and Engineering University of California Berkeley CA 94720 USA, National Center for Electron Microscopy, Molecular Foundry, Lawrence, Berkeley National Laboratory Berkeley CA 94720 USA
- School of Materials Science and Engineering Nanyang Technological University Nanyang Avenue Singapore 639798 Singapore, Energy Research Institute @NTU, ERI@N, Research Techno Plaza, X-Frontier Block, Level 5 50 Nanyang Drive Singapore 637553 Singapore
- Publication Date:
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1401531
- Resource Type:
- Publisher's Accepted Manuscript
- Journal Name:
- ChemSusChem
- Additional Journal Information:
- Journal Name: ChemSusChem Journal Volume: 10 Journal Issue: 11; Journal ID: ISSN 1864-5631
- Publisher:
- Wiley Blackwell (John Wiley & Sons)
- Country of Publication:
- Germany
- Language:
- English
Citation Formats
Gurudayal,, John, Rohit Abraham, Boix, Pablo P., Yi, Chenyi, Shi, Chen, Scott, M. C., Veldhuis, Sjoerd A., Minor, Andrew M., Zakeeruddin, Shaik M., Wong, Lydia Helena, Grätzel, Michael, and Mathews, Nripan. Atomically Altered Hematite for Highly Efficient Perovskite Tandem Water‐Splitting Devices. Germany: N. p., 2017.
Web. doi:10.1002/cssc.201700159.
Gurudayal,, John, Rohit Abraham, Boix, Pablo P., Yi, Chenyi, Shi, Chen, Scott, M. C., Veldhuis, Sjoerd A., Minor, Andrew M., Zakeeruddin, Shaik M., Wong, Lydia Helena, Grätzel, Michael, & Mathews, Nripan. Atomically Altered Hematite for Highly Efficient Perovskite Tandem Water‐Splitting Devices. Germany. https://doi.org/10.1002/cssc.201700159
Gurudayal,, John, Rohit Abraham, Boix, Pablo P., Yi, Chenyi, Shi, Chen, Scott, M. C., Veldhuis, Sjoerd A., Minor, Andrew M., Zakeeruddin, Shaik M., Wong, Lydia Helena, Grätzel, Michael, and Mathews, Nripan. Fri .
"Atomically Altered Hematite for Highly Efficient Perovskite Tandem Water‐Splitting Devices". Germany. https://doi.org/10.1002/cssc.201700159.
@article{osti_1401531,
title = {Atomically Altered Hematite for Highly Efficient Perovskite Tandem Water‐Splitting Devices},
author = {Gurudayal, and John, Rohit Abraham and Boix, Pablo P. and Yi, Chenyi and Shi, Chen and Scott, M. C. and Veldhuis, Sjoerd A. and Minor, Andrew M. and Zakeeruddin, Shaik M. and Wong, Lydia Helena and Grätzel, Michael and Mathews, Nripan},
abstractNote = {Abstract Photoelectrochemical (PEC) cells are attractive for storing solar energy in chemical bonds through cleaving of water into oxygen and hydrogen. Although hematite (α‐Fe 2 O 3 ) is a promising photoanode material owing to its chemical stability, suitable band gap, low cost, and environmental friendliness, its performance is limited by short carrier lifetimes, poor conductivity, and sluggish kinetics leading to low (solar‐to‐hydrogen) STH efficiency. Herein, we combine solution‐based hydrothermal growth and a post‐growth surface exposure through atomic layer deposition (ALD) to show a dramatic enhancement of the efficiency for water photolysis. These modified photoanodes show a high photocurrent of 3.12 mA cm −2 at 1.23 V versus RHE, (>5 times higher than Fe 2 O 3 ) and a plateau photocurrent of 4.5 mA cm −2 at 1.5 V versus RHE. We demonstrate that these photoanodes in tandem with a CH 3 NH 3 PbI 3 perovskite solar cell achieves overall unassisted water splitting with an STH conversion efficiency of 3.4 %, constituting a new benchmark for hematite‐based tandem systems.},
doi = {10.1002/cssc.201700159},
journal = {ChemSusChem},
number = 11,
volume = 10,
place = {Germany},
year = {Fri May 12 00:00:00 EDT 2017},
month = {Fri May 12 00:00:00 EDT 2017}
}
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