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Band gap and Morphology Engineering of Hematite Nanoflakes from an Ex Situ Sn Doping for Enhanced Photoelectrochemical Water Splitting.
| Content Provider | Europe PMC |
|---|---|
| Author | Ahn, Hyo-Jin Kment, Stepan Naldoni, Alberto Zbořil, Radek Schmuki, Patrik |
| Copyright Year | 2022 |
| Abstract | In this article,we report a simple ex situ Sn-dopingmethod on hematite nanoflakes (coded as MSnO2-H) that canprotect the nanoflake (NF) morphology against the 800 °C high-temperatureannealing process and activate the photoresponse of hematite until800 nm wavelength excitation. MSnO2-H has been fabricatedby dropping SnCl4 ethanol solution on hematite nanoflakeshomogeneously grown over the conductive FTO glass substrate and annealedat 500 °C to synthesize the SnO2 nanoparticles onhematite NFs. The Sn-treated samples were then placed in a furnaceagain, and the sintering process was conducted at 800 °C for15 min. During this step, structure deformation of hematite occursnormally due to the grain boundary motion and oriented attachment.However, in the case of MSnO2-H, the outer SnO2 nanoparticles efficiently prevented a shape deformation and maintainedthe nanoflake shape owing to the encapsulation of hematite NFs. Furthermore,the interface of hematite/SnO2 nanoparticles became thespots for a heavy Sn ion doping. We demonstrated the generation ofthe newly localized states, resulting in an extension of the photoresponseof hematite until 800 nm wavelength light irradiation. Furthermore,we demonstrated that SnO2 nanoparticles can effectivelyact as a passivation layer, which can reduce the onset potential ofhematite for water splitting redox reactions. The optimized MSnO2-H nanostructures showed a 2.84 times higher photocurrentdensity and 300 mV reduced onset potential compared with a pristinehematite nanoflake photoanode. |
| Journal | ACS Omega |
| Volume Number | 7 |
| PubMed Central reference number | PMC9535642 |
| Issue Number | 39 |
| PubMed reference number | 36211042 |
| e-ISSN | 24701343 |
| DOI | 10.1021/acsomega.2c04028 |
| Language | English |
| Publisher | American Chemical Society |
| Publisher Date | 2022-09-19 |
| Access Restriction | Open |
| Rights License | Permits non-commercial access and re-use, provided that author attribution and integrity are maintained; but does not permit creation of adaptations or other derivative works (https://creativecommons.org/licenses/by-nc-nd/4.0/). © 2022 The Authors. Published by American Chemical Society |
| Content Type | Text |
| Resource Type | Article |
| Subject | Chemistry Chemical Engineering |
