Redox dynamics of 2D crystalline vanadium oxide phases on high-index anatase facets

Ek, Martin,1984Chalmers University of Technology,Lund University,Lunds universitet,NanoLund: Centre for Nanoscience,Annan verksamhet, LTH,Lunds Tekniska Högskola,Centrum för analys och syntes,Kemiska institutionen,Institutioner vid LTH,LTH profilområde: Aerosoler,LTH profilområden,LTH profilområde: Nanovetenskap och halvledarteknologi,LU profilområde: Ljus och material,Lunds universitets profilområden,Other operations, LTH,Faculty of Engineering, LTH,Centre for Analysis and Synthesis,Department of Chemistry,Departments at LTH,Faculty of Engineering, LTH,LTH Profile Area: Aerosols,LTH Profile areas,Faculty of Engineering, LTH,LTH Profile Area: Nanoscience and Semiconductor Technology,Faculty of Engineering, LTH,LU Profile Area: Light and Materials,Lund University Profile areas,Haldor Topsøe A/S,Haldor Topsoe,Chalmers tekniska högskola (författare)

Vanadium oxides exist in a multitude of phases with varying structure and stoichiometry. This abundance of phases can be extended through the use of other oxides as supports, and through redox treatments. However, the combined effects of different supports and redox treatments can be difficult to identify, particularly when present as different terminating facets on nanoparticles. Here, we examine structural dynamics of 2D vanadium oxides supported on anatase TiO2 nanoparticles, correlated with changes in oxidation state, using in situ transmission electron microscopy imaging and electron energy loss spectroscopy. As the average oxidation state is reduced below V(iv), an ordered cubic V(ii) phase is observed exclusively at the high-index {10l} facets of the support. This local accommodation of highly reduced states is necessary for explaining the observed range of average oxidation states. In turn, the findings show that oxidation states extending from V(v)-V(iv) to V(ii) can be simultaneously stabilized by different supporting oxide surfaces during exposure to atmospheres with controlled redox potential.

Godiksen, AnitaHaldor Topsoe,Haldor Topsøe A/S (författare)
Arnarson, LogiHaldor Topsoe,Haldor Topsøe A/S (författare)
Moses, PGHaldor Topsoe,Haldor Topsøe A/S (författare)
Rasmussen, Søren B.Haldor Topsoe,Haldor Topsøe A/S (författare)
Skoglundh, Magnus,1965Chalmers University of Technology,Chalmers tekniska högskola(Swepub:cth)skoglund (författare)
Olsson, Eva,1960Chalmers University of Technology,Chalmers tekniska högskola(Swepub:cth)f10eva (författare)
Helveg, S.Danmarks Tekniske Universitet,Technical University of Denmark (författare)
NanoLund: Centre for NanoscienceAnnan verksamhet, LTH (creator_code:org_t)

Av författaren/redakt...: Ek, Martin, 1984; Godiksen, Anita; Arnarson, Logi; Moses, PG; Rasmussen, Søren ...; Skoglundh, Magnu ...; visa fler...; Olsson, Eva, 196 ...; Helveg, S.; visa färre...

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