Enhanced formic acid oxidation on polycrystalline platinum modified by spontaneous deposition of gold. Fourier transform infrared spectroscopy studies

Evolution of adsorbed CO on Pt and Pt/Au surface

“…The effect of Au modification on the electrode's electrochemical response is clearly seen in Fig. 1 and has been previously reported elsewhere [7,11]. The Pt/Au electrode shows a substantial current decrease, as compared to the neat Pt electrode, due to the lower available Pt surface in the former.…”

“…In a previous paper we reported, for the first time, a strong timedependent behavior for the oxidation of formic acid on Pt/Au surface and demonstrated that, in the presence of formic acid, at sufficiently long equilibration periods the surface is covered with adsorbed species yielding both, the mixed-metal and the neat Pt surfaces, equally inactive [11]. On the other hand, in the neat Pt surface the poisoning rate is so high that only the indirect pathway is observed.…”

“…Au-modified Pt electrodes were prepared using the spontaneous deposition (electroless) technique [11]. Briefly, neat Pt electrodes were soaked in a 1 mM AuHCl 4 /0.5 M HClO 4 solution for 15 min and then washed copiously with ultra-pure water.…”

“…In this work, we studied in detail one of the possible limitingsteps during CO oxidation at Pt and Pt/Au electrodes, namely CO adsorption and diffusion at the electrode's surface. To this end, we used a previously reported electroless method for Pt surface modification, that entails the spontaneous deposition of gold at Pt electrodes [11]. Our group developed this process as a clean way to obtain Au modified Pt electrodes by repetitive immersion of Pt electrodes in HAuCl 4 solution.…”

Facile electrooxidation of ethanol on reduced graphene oxide supported Pt–Pd bimetallic nanocomposite surfaces in acidic media

“…Fuel cell technology is witnessing accelerating growth in both the automobile and stationary energy sectors [4,5]. Proton exchange membrane fuel cells (PEMFCs) operated by either hydrogen or by small organic molecules like CH 3 OH, HCOOH, C 2 H 5 OH is considered to be promising energy sources for many applications due to its promising energy efficiency and small weight and volume [6][7][8] compared to other types of fuel cells. In particular, exploration of ethanol as a fuel is interesting due to the feasibility of large-scale production of ethanol from sugar-containing materials.…”