In Situ Imaging of Cu2O under Reducing Conditions: Formation of Metallic Fronts by Mass Transfer
2013 (English)In: Journal of the American Chemical Society, ISSN 0002-7863, E-ISSN 1520-5126, Vol. 135, no 45, 16781-16784 p.Article in journal (Refereed) Published
Active catalytic sites have traditionally been analyzed based on static representations of surface structures and characterization of materials before or after reactions. We show here by a combination of in situ microscopy and spectroscopy techniques that, in the presence of reactants, an oxide catalyst's chemical state and morphology are dynamically modified. The reduction of Cu2O films is studied under ambient pressures (AP) of CO. The use of complementary techniques allows us to identify intermediate surface oxide phases and determine how reaction fronts propagate across the surface by massive mass transfer of Cu atoms released during the reduction of the oxide phase in the presence of CO. High resolution in situ imaging by AP scanning tunneling microscopy (AP-STM) shows that the reduction of the oxide films is initiated at defects both on step edges and the center of oxide terraces.
Place, publisher, year, edition, pages
2013. Vol. 135, no 45, 16781-16784 p.
Ambient pressures, Catalytic sites, Complementary techniques, High resolution, In-situ microscopies, Oxide catalysts, Reducing conditions, Static representation
IdentifiersURN: urn:nbn:se:kth:diva-136420DOI: 10.1021/ja408506yISI: 000327103600010PubMedID: 24168720ScopusID: 2-s2.0-84887641653OAI: oai:DiVA.org:kth-136420DiVA: diva2:676210
FunderSwedish Research Council, 62360
QC 201312172013-12-052013-12-052016-08-25Bibliographically approved