Fabrication of platinum electrocatalysts on carbon nanotubes using atomic layer deposition for proton exchange membrane fuel cells

The correlation of electrochemical and fuel cell results for alcohol oxidation in acidic and alkaline media

“…Also other groups have reported increased EASA values for ALD prepared catalyst [162,163] indicating that the ALD preparation method could provide a well distributed catalyst having a higher metal surface area. Moreover, in chronoamperometric experiments ( Figure 7 in Publication III) it can be observed that the normalized current of isopropanol oxidation on the Pd/C (ALD) catalyst is decreases rapidly due to surface poisoning by oxidation reaction products, however, this effect is not observed with the commercial catalyst nor with the planar Pd in Publication I.…”

“…Overall, if the proposed mechanism is confirmed this method could become very important in the DAFC catalyst preparation due to similar or increased activity with decreased metal loadings in comparison to commercial nanoparticle catalysts reported previously [162,163] and in Publication III. As an example ethanol oxidation on an ALD prepared Pd/C and commercial Pd/C catalysts is shown in Figure 29 where it can be noted that not only lower onset potential but significantly increased current density already at the lower potentials is obtain when the currents are normalized with the catalyst loadings.…”

Air-based photoelectrochemical cell capturing water molecules from ambient air for hydrogen production

“…Pt islands on CNTs have previously been demonstrated for fuel cell applications. [28][29][30] In those examples, CNTs were functionalized by acid treatment, followed by ALD using O 2 as the oxidant. Here a process with O 3 as the oxidant was used, 31 and pretreatment of CNTs was not necessary.…”

Application of atomic layer deposition in fabricating high-efficiency electrocatalysts

“…Hsieh et al [40] reported that the oxygen-containing functional groups on graphene oxide (GO) not only favored the dispersion of Pt nanoparticles but also facilitated the oxidation of strongly adsorbed CO intermediates and the regeneration of poisoned Pt sites, thereby enhancing the activity and CO-resistance stability in the formic acid electrooxidation reaction. H2SO4, HClO4, and citric acid can also be used to create oxygen-containing groups on the surface of carbon supports [29,41,42].…”