142
Pt ML supported on Au(111) demonstrates slightly negatively shifted reaction-onset
potential and over fourfold increase in peak current density. Along with more electrochemical studies, a trend is observable, indicating that increased lattice compression lowers reactivity.
Several Pt ML nanocatalysts composed of Pt ML supported on mono- or bimetallic
nanoparticle cores were studied (Fig. 8.31), and the activity for both methanol and
ethanol electrooxidation reactions increased in the order of Pt ML /Pd/C < Pt/C < Pt ML /
Au/C. Hence, a qualitatively similar trend is observed as with single-crystal surfaces, viz. dilated Pt ML enhances activity while activity in compressed when Pt ML is
decreased. Pt ML supported on PdAu bimetallic alloy nanoparticles demonstrated an
Fig. 8.30 Positive-going voltammetric scans for Pt(111) and Pt ML supported on five different substrates (Au(111), Pd(111), Ir(111), Rh(111), and Ru(0001)) in 0.1 M HClO 4 containing 0.5 M ethanol with scan rate 10 mV/s [43]. Reproduced with permission of the American Chemical Society
Fig. 8.31 Positive-going
voltammetric scans for
Pt/C and Pt ML supported on
different nanoparticle
substrates in 0.1 M HClO 4
containing 0.5 M ethanol
with scan rate 10 mV/s
[43]. Reproduced with
permission of the
American Chemical
Society
8 Catalytic Properties of Pt Monolayer Electrocatalysts
Pt ML supported on Au(111) demonstrates slightly negatively shifted reaction-onset
potential and over fourfold increase in peak current density. Along with more electrochemical studies, a trend is observable, indicating that increased lattice compression lowers reactivity.
Several Pt ML nanocatalysts composed of Pt ML supported on mono- or bimetallic
nanoparticle cores were studied (Fig. 8.31), and the activity for both methanol and
ethanol electrooxidation reactions increased in the order of Pt ML /Pd/C < Pt/C < Pt ML /
Au/C. Hence, a qualitatively similar trend is observed as with single-crystal surfaces, viz. dilated Pt ML enhances activity while activity in compressed when Pt ML is
decreased. Pt ML supported on PdAu bimetallic alloy nanoparticles demonstrated an
Fig. 8.30 Positive-going voltammetric scans for Pt(111) and Pt ML supported on five different substrates (Au(111), Pd(111), Ir(111), Rh(111), and Ru(0001)) in 0.1 M HClO 4 containing 0.5 M ethanol with scan rate 10 mV/s [43]. Reproduced with permission of the American Chemical Society
Fig. 8.31 Positive-going
voltammetric scans for
Pt/C and Pt ML supported on
different nanoparticle
substrates in 0.1 M HClO 4
containing 0.5 M ethanol
with scan rate 10 mV/s
[43]. Reproduced with
permission of the
American Chemical
Society
8 Catalytic Properties of Pt Monolayer Electrocatalysts