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https://tkuir.lib.tku.edu.tw/dspace/handle/987654321/125741
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| Title: | Surface electronic structure reconfiguration of hematite nanorods for efficient photoanodic water oxidation |
| Authors: | Yanming Fu, Ying-Rui Lu, Feng Ren, Zhuo Xing, Jie Chen, Penghui Guo, Way-Faung Pong, Chung-Li Dong, Liang Zhao, Shaohua Shen |
| Date: | 2020-01 |
| Issue Date: | 2024-07-31 12:11:22 (UTC+8) |
| Publisher: | Wiley-VCH |
| Abstract: | Hematite (α-Fe2O3) is a promising candidate as a semiconducting photoanode for photoelectrochemical (PEC) water splitting. However, its PEC performance is much limited by the sluggish charge transfer kinetics at the α-Fe2O3/electrolyte interface. Herein, an insulative metal oxide, hafnium dioxide (HfO2), is deposited on the surface of α-Fe2O3 to engineer the photoelectrode/electrolyte interfacial electronic structure. With the conformal HfO2 overlayer coating, the surface defects of α-Fe2O3 are effectively passivated, whereas the charge migration from α-Fe2O3 to the electrolyte is blocked by the continuous HfO2 overlayer, leading to a moderate PEC enhancement. In contrast, with HfO2 nanoparticles deposited, the photogenerated holes are not only effectively extracted from the bulk of α-Fe2O3 but are also promptly injected into the electrolyte for water oxidation, due to the reconfigurated surface electronic structure. Consequently, the HfO2 nanoparticles-decorated α-Fe2O3 photoanode achieves an onset potential cathodic shift by 180 mV and a 460% photocurrent density enhancement, reaching up to 1.20 mA cm−2 at 1.23 V versus reversible hydrogen electrode as compared with pristine α-Fe2O3. An alternative approach to engineer the photoelectrode/electrolyte interfacial electronic structure to improve the PEC performance for water splitting is demonstrated herein. |
| Relation: | Solar RRL 4(1), 1900349 |
| DOI: | 10.1002/solr.201900349 |
| Appears in Collections: | [電機工程學系暨研究所] 期刊論文
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