Improving water oxidation performance by implementing heterointerfaces between ceria and metal-oxide nanoparticles

Zahra Albu, Fahad Alzaid, Salma AlQahtani, Nawal Al Abass, Feriah Alenazey, Ibrahim Allehyani, Bandar AlOtaibi

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

The main technical challenge for the electrolytic production of hydrogen via water splitting lies in realizing a very stable material that effectively oxidizes water under low overpotential (η). Of all materials, metal oxides hold the greatest promise due to their inherited chemical stability in aqueous solutions; however, electrolytic effectiveness in water oxidation reactions (OERs) is limited to precious metals. In this study, we designed metal oxide/metal oxide (MO/MO) nanoparticle heterointerfaces to offer more active sites and enhance the overall performance of the OER. To demonstrate this improvement, we synthesized and characterized CeO2/Co3O4, CeO2/CuO, and CeO2/NiO nanoparticles. In these structures, onset potential and photoactivity were significantly improved relative to a single MO. A cathodic shift of onset potential as high as ~0.4 or 0.3 V was recorded for CeO2/Co3O4 relative to CeO2 or Co3O4, respectively. This improvement was further investigated using density functional theory calculations, upon which adsorption preferability and reaction free energy at the CeO2/Co3O4 heterointerface were found to play significant roles in OER enhancement.
Original languageEnglish (US)
Pages (from-to)39-46
Number of pages8
JournalJournal of Colloid and Interface Science
Volume587
DOIs
StatePublished - Dec 25 2020
Externally publishedYes

Fingerprint

Dive into the research topics of 'Improving water oxidation performance by implementing heterointerfaces between ceria and metal-oxide nanoparticles'. Together they form a unique fingerprint.

Cite this