True co-catalytic integration of MgFe-LDH with hematite for high-efficiency photoelectrochemical water oxidation

True co-catalytic integration of MgFe-LDH with hematite for high-efficiency photoelectrochemical water oxidation | Authorea try { document.documentElement.classList.add('js'); } catch (e) { } var _gaq = _gaq || []; _gaq.push(['_setAccount', 'G-8VDV14Y67G']); _gaq.push(['_trackPageview']); (function() { var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true; ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js'; var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s); })(); Skip to main content Preprints Collections Wiley Open Research IET Open Research Ecological Society of Japan All Collections About About Authorea FAQs Contact Us Quick Search anywhere Search for preprint articles, keywords, etc. Search Search ADVANCED SEARCH SCROLL This is a preprint and has not been peer reviewed. Data may be preliminary. 12 August 2025 V1 Latest version Share on True co-catalytic integration of MgFe-LDH with hematite for high-efficiency photoelectrochemical water oxidation Authors : Irfan Khan 0000-0002-5724-1732 [email protected] , Tímea Benkó , Soma Keszei , András Deák , Dániel Zámbó , Shaohua Shen , Yiqing wang , … Show All … , Zsolt E. Horváth , Miklós Németh , Zsolt Czigány , Albin Pintar , Gregor Zerjav , and József Sándor Pap Show Fewer Authors Info & Affiliations https://doi.org/10.22541/au.175501497.75109197/v1 205 views 129 downloads Contents Abstract Supplementary Material Information & Authors Metrics & Citations View Options References Figures Tables Media Share Abstract Layered double hydroxides (LDHs) are versatile and inexpensive materials, many of which have long known as robust water oxidation electrocatalysts. A simple variant, MgFe-LDH in the form of nanosheets, adjustable in size has been successfully decorated on the surface of hematite (α-Fe2O3) nanorods to structure an integrating photoanode for improved photoelectrochemical (PEC) water oxidation. Combined XPS and SEM analysis showed that MgFe-LDH decoration does not interfere with the nanostructure of the light-harvesting α-Fe2O3. However, intensified Raman bands for the decorated α-Fe2O3 pointed to enhanced interactions between MgFe-LDH and α-Fe2O3. Optimization of the surface amount for MgFe-LDH can lead to a 340 mV cathodic shift in the onset potential at 0.1 mA/cm2. Mott-Schottky analysis and electrochemical impedance spectroscopy further revealed that LDH decoration enhances the photogenerated charge-carrier separation and efficiently consumes holes accumulating at the electrode surface. Furthermore, density functional theory (DFT) calculations suggest a lower Gibbs free energy (ΔG) value of 1.37 eV for MgFe-LDH/α-Fe2O3 contrasted to pristine α-Fe2O3 (ΔG of 1.46 eV) for the rate-determining step (RDS), further indicating that the MgFe-LDH co-catalyst lowers the activation energy barrier for the OER. This work offers a promising method for designing high efficiency and low-cost hematite based photoanodes for solar-fuel devices relying on non-critical elements. Supplementary Material File (manuscipt_hem_ldh_eem_0811.docx) Download 7.57 MB Information & Authors Information Version history V1 Version 1 12 August 2025 Copyright This work is licensed under a Non Exclusive No Reuse License. Keywords charge transfer density functional theory electrochemistry energy materials nanomaterials Authors Affiliations Irfan Khan 0000-0002-5724-1732 [email protected] HUN-REN Centre for Energy Research View all articles by this author Tímea Benkó HUN-REN Centre for Energy Research View all articles by this author Soma Keszei HUN-REN Centre for Energy Research View all articles by this author András Deák HUN-REN Centre for Energy Research View all articles by this author Dániel Zámbó HUN-REN Centre for Energy Research View all articles by this author Shaohua Shen Xi'an Jiaotong University View all articles by this author Yiqing wang Xi'an Jiaotong University View all articles by this author Zsolt E. Horváth HUN-REN Centre for Energy Research View all articles by this author Miklós Németh HUN-REN Centre for Energy Research View all articles by this author Zsolt Czigány HUN-REN Centre for Energy Research View all articles by this author Albin Pintar National Institute of Chemistry View all articles by this author Gregor Zerjav National Institute of Chemistry, Hajdrihova View all articles by this author József Sándor Pap HUN-REN Centre for Energy Research View all articles by this author Metrics & Citations Metrics Article Usage 205 views 129 downloads .FvxKWukQNSOunydq8rnd { width: 100px; } Citations Download citation Irfan Khan, Tímea Benkó, Soma Keszei, et al. True co-catalytic integration of MgFe-LDH with hematite for high-efficiency photoelectrochemical water oxidation. Authorea . 12 August 2025. DOI: https://doi.org/10.22541/au.175501497.75109197/v1 If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. 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