Subwavelength densely packed disordered semiconductor metasurface units for photoelectrochemical hydrogen generation

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buir.contributor.authorUlusoy Ghobadi, T. Gamze
buir.contributor.authorGhobadi, Amir
buir.contributor.authorKaradaş, Ferdi
buir.contributor.authorÖzbay, Ekmel
buir.contributor.orcidUlusoy Ghobadi, T. Gamze|0000-0002-7669-1587
buir.contributor.orcidKaradaş, Ferdi|0000-0001-7171-9889
buir.contributor.orcidÖzbay, Ekmel|0000-0003-2953-1828
dc.citation.epage2837en_US
dc.citation.issueNumber3en_US
dc.citation.spage2826en_US
dc.citation.volumeNumber5en_US
dc.contributor.authorUlusoy Ghobadi, T. Gamze
dc.contributor.authorGhobadi, Amir
dc.contributor.authorOdabaşı, Oğuz
dc.contributor.authorKaradaş, Ferdi
dc.contributor.authorÖzbay, Ekmel
dc.date.accessioned2023-02-28T19:37:11Z
dc.date.available2023-02-28T19:37:11Z
dc.date.issued2022-03-10
dc.departmentDepartment of Chemistryen_US
dc.departmentDepartment of Electrical and Electronics Engineeringen_US
dc.departmentDepartment of Physicsen_US
dc.departmentNanotechnology Research Center (NANOTAM)en_US
dc.description.abstractFor most semiconductors, especially the visible-light-absorbing ones, the carrier diffusion length is significantly shorter than the light penetration depth, limiting their photoactivities. This limitation could be mitigated through the use of subwavelength semiconductor-based metasurfaces and metamaterials. In this paper, a large-scale compatible metasurface photocathode, made of densely packed disordered p-type chromium oxide (CrOX), is developed to be utilized in photoelectrochemical (PEC) hydrogen generation. For this purpose, first, tightly packed random Cr nanorods are fabricated using an oblique angle deposition technique. Afterward, an annealing step is applied to the sample to transform these metallic units into a semiconducting p-type CrOX-based metasurface. Based on the experimental characterization results and numerical simulations, the proposed design can provide strong light-matter interactions in an ultra-broadband-wavelength range, mainly due to its multidimensional random geometry and ultrasmall gap sizes. Finally, to substantiate the activity of the CrOXnanorods, a core-crown geometry is developed where the NiOXcapping layer catalyzes the hydrogen evolution reaction (HER). The proposed heterostructure metasurface absorber can impose photocurrent values as large as 50 μA cm-2with a photocurrent spectral response extended up to 500 nm. Moreover, the electrode shows outstanding operation under light irradiation for 9 hours. This work demonstrates a simple, scalable design strategy to fabricate low-cost and stable photocathodes for PEC hydrogen evolution. © 2022 American Chemical Society. All rights reserved.en_US
dc.identifier.doi10.1021/acsaem.1c03363en_US
dc.identifier.urihttp://hdl.handle.net/11693/111975
dc.language.isoEnglishen_US
dc.publisherAmerican Chemical Societyen_US
dc.relation.isversionofhttps://dx.doi.org/10.1021/acsaem.1c03363en_US
dc.source.titleACS Applied Energy Materialsen_US
dc.subjectHydrogen generationen_US
dc.subjectMetamaterialsen_US
dc.subjectMetasurfacesen_US
dc.subjectMie resonanceen_US
dc.subjectP-Type metal oxideen_US
dc.subjectPhotoelectrochemical water splittingen_US
dc.titleSubwavelength densely packed disordered semiconductor metasurface units for photoelectrochemical hydrogen generationen_US
dc.typeArticleen_US

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