Methanol, Formaldehyde, and Formic Acid Adsorption/Oxidation on a Carbon-Supported Pt Nanoparticle Fuel Cell Catalyst: A Comparative Quantitative DEMS Study - Fuel Cell Catalysis: A Surface Science Approach - page 429

Figure 13.6 Potential-step electro-oxidation of formaldehyde on a Pt/Vulcan thin-film elec-
trode (7 mg Pt cm 22 , geometric area 0.28 cm 2 ) in 0.5 M H 2 SO 4 solution containing 0.1 M HCHO
upon stepping the potential from 0.16 to 0.6 V (electrolyte flow rate 5 mLs 21 , at room tempera-
ture). (a) Solid line, faradaic current transients; dashed line, partial current for HCHO oxidation
to CO 2 ; dotted line, difference between the net faradaic current and that for CO 2 formation. (b)
Solid line, m/z ¼ 44 ion current transients; gray line: potential-step oxidation of pre-adsorbed
CO derived upon HCHO adsorption at 0.16 V, in HCHO-free sulfuric acid solution. (c) Current
efficiency transients for CO 2 formation (dashed line) and formic acid formation (dotted line).
Figure 13.7 (Continued ) (b) Solid line, m/z ¼ 44 ion current transients; gray line, potential-
step oxidation of pre-adsorbed CO derived upon CH 3 OH adsorption at 0.16 V, in CH 3 OH-free
H 2 SO 4 solution. (c) m/z ¼ 60 ion current transients. (d) Current efficiency transients for CO 2
formation (dashed line), formic acid formation (dash - dotted line), and formaldehyde formation
(dotted line).