In Situ Imaging of Cu2O under Reducing Conditions: Formation of Metallic Fronts by Mass Transfer

In Situ Imaging of Cu2O under Reducing Conditions : Formation of Metallic Fronts by Mass Transfer

QC 20131217
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.

Xu, FangBrookhaven National Laboratory, USA (author)
Dvorak, FilipCharles University, Czech Republic (author)
Mudiyanselage, KumuduBrookhaven National Laboratory, USA (author)
Soldemo, MarkusKTH,Materialfysik, MF(Swepub:kth)u1vch1o0 (author)
Weissenrieder, JonasKTH,Materialfysik, MF(Swepub:kth)u1dg6qtm (author)
Senanayake, Sanjaya D.Brookhaven National Laboratory, USA (author)
Sadowski, Jerzy T. (author)
Rodriguez, José A.Brookhaven National Laboratory, USA (author)
Matolín, VladimírCharles University, Czech Republic (author)
White, Michael G.Brookhaven National Laboratory, USA; Brookhaven National Laboratory, USA (author)
Stacchiola, Darío J.Brookhaven National Laboratory, USA (author)
Brookhaven National Laboratory, USACharles University, Czech Republic (creator_code:org_t)

In:Journal of the American Chemical Society: American Chemical Society (ACS)135:45, s. 16781-167840002-78631520-5126

By the author/editor: Baber, Ashleigh ...; Xu, Fang; Dvorak, Filip; Mudiyanselage, K ...; Soldemo, Markus; Weissenrieder, J ...; show more...; Senanayake, Sanj ...; Sadowski, Jerzy ...; Rodriguez, José ...; Matolín, Vladimí ...; White, Michael G ...; Stacchiola, Darí ...; show less...

About the subject

NATURAL SCIENCES: NATURAL SCIENCES; and Chemical Science ...; and Physical Chemist ...

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