Journal
SCIENCE
Volume 337, Issue 6099, Pages 1200-1203Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1223598
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Funding
- New Facility and Mid-scale Instrumentation grants
- U.S. Department of Energy, Office of Science, and Office of Basic Energy Sciences (DOE-BES) [DE-AC02-05CH11231]
- DOE-BES Geosciences program
- Danish Council for Independent Research
- DOE-BES [DE-AC02-06CH11357]
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Electron mobility within iron (oxyhydr)oxides enables charge transfer between widely separated surface sites. There is increasing evidence that this internal conduction influences the rates of interfacial reactions and the outcomes of redox-driven phase transformations of environmental interest. To determine the links between crystal structure and charge-transport efficiency, we used pump-probe spectroscopy to study the dynamics of electrons introduced into iron(III) (oxyhydr) oxide nanoparticles via ultrafast interfacial electron transfer. Using time-resolved x-ray spectroscopy and ab initio calculations, we observed the formation of reduced and structurally distorted metal sites consistent with small polarons. Comparisons between different phases (hematite, maghemite, and ferrihydrite) revealed that short-range structural topology, not long-range order, dominates the electron-hopping rate.
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