Electronic and structural properties of single-crystal Jahn–Teller active Co1+xMn2–xO4 thin films
Journal Article
·
· Journal of Physics. Condensed Matter
- Auburn Univ., AL (United States)
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
- Argonne National Lab. (ANL), Argonne, IL (United States)
Recent investigations on spinel CoMn2O4 have shown its potential for applications in water splitting and fuel cell technologies as it exhibits strong catalytic behavior through oxygen reduction reactivity. To further understand this material, we report for the first time the synthesis of single-crystalline Co1+xMn2-xO4 thin films using molecular beam epitaxy. By varying sample composition, we establish links between cation stoichiometry and material properties using in-situ x-ray photoelectron spectroscopy, x-ray diffraction, scanning transmission electron microscopy, x-ray absorption spectroscopy, and spectroscopic ellipsometry. Our results indicate that excess Co ions occupy interstitial tetrahedral sites up to a certain stoichiometry, then are substitutional for octahedrally-coordinated Mn beyond this threshold. Here, we compare these results with density functional theory models of stoichiometric CoMn2O4 to understand how the Jahn-Teller distortion and hybridization in Mn-O bonds impact the ability to hole dope the material with excess Co. The findings provide important insights into CoMn2O4 and related spinel oxides for future application as inexpensive oxygen reduction reaction catalysts.
- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL (United States); Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
- Sponsoring Organization:
- National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division; USDOE Office of Science (SC), Biological and Environmental Research (BER)
- Grant/Contract Number:
- AC02-06CH11357; AC05-76RL01830
- OSTI ID:
- 1764737
- Alternate ID(s):
- OSTI ID: 1774810
OSTI ID: 23186444
- Report Number(s):
- PNNL-SA--156954
- Journal Information:
- Journal of Physics. Condensed Matter, Journal Name: Journal of Physics. Condensed Matter Journal Issue: 12 Vol. 33; ISSN 0953-8984
- Publisher:
- IOP PublishingCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Similar Records
Jahn–Teller-driven phase segregation in MnxCo3–xO4 spinel thin films
Jahn-Teller Effect in Spinel Manganites Probed by Soft X-ray Absorption Spectroscopy
Journal Article
·
Tue Jul 11 20:00:00 EDT 2023
· Journal of Vacuum Science and Technology A
·
OSTI ID:2000700
Jahn-Teller Effect in Spinel Manganites Probed by Soft X-ray Absorption Spectroscopy
Journal Article
·
Sat Dec 31 23:00:00 EST 2005
· Appl. Phys. Lett.
·
OSTI ID:913955