3 research outputs found
<i>In Situ</i> Imaging of Cu<sub>2</sub>O under Reducing Conditions: Formation of Metallic Fronts by Mass Transfer
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 <i>in situ</i> microscopy and spectroscopy techniques
that, in the presence of reactants, an oxide catalyst’s chemical
state and morphology are dynamically modified. The reduction of Cu<sub>2</sub>O 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 <i>in situ</i> 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
<i>In Situ</i> Imaging of Cu<sub>2</sub>O under Reducing Conditions: Formation of Metallic Fronts by Mass Transfer
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 <i>in situ</i> microscopy and spectroscopy techniques
that, in the presence of reactants, an oxide catalyst’s chemical
state and morphology are dynamically modified. The reduction of Cu<sub>2</sub>O 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 <i>in situ</i> 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
<i>In Situ</i> Imaging of Cu<sub>2</sub>O under Reducing Conditions: Formation of Metallic Fronts by Mass Transfer
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 <i>in situ</i> microscopy and spectroscopy techniques
that, in the presence of reactants, an oxide catalyst’s chemical
state and morphology are dynamically modified. The reduction of Cu<sub>2</sub>O 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 <i>in situ</i> 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