The Electrosorption and the Potentiodynamic Electrooxidation of Ethane on Platinum at Different Temperatures

Abstract

The electrosorption and the potentiodynamic electrooxidation of ethane on platinized platinum in 1N H2SO4 has been studied in the 20°–80°C range. The potentiodynamic I/E profiles run immediately after the potentiostatic electrosorption of the hydrocarbon show that three different species participate in the electrooxidation process. The various electrosorbed species are tentatively related to the electrosorbed species which are formed during the electrosorption of both methane and ethylene on platinum. The electrochemical process is discussed through a complex reaction pathway involving electrosorption, interconversion, and electrooxidation processes.

Sensitivity Analyses on the Impact of Air Contaminants on Automotive Fuel Cells

“…At low temperatures a dehydrogenation of ethane is leading to adsorbed C 2 H 2 45. At high temperatures oxidation processes overweigh, leading to CO, COH and subsequently a desorption of CO 2 45. Referring to other studies they see these results as a general reaction scheme for short chained aliphatic compounds.…”

“…For ethane at high temperature or methane at a widespread temperature range, oxidation processes are most likely to appear at Pt. For ethane at low temperatures or ethylene at a wider temperature range, reduction/ hydrogenation processes are the consequent reactions at Pt 45. Anyway, they also observe only very little adsorption of ethane on Pt at 0.5 V and no adsorption at 0.6 V 45.…”

“…For ethane at low temperatures or ethylene at a wider temperature range, reduction/ hydrogenation processes are the consequent reactions at Pt 45. Anyway, they also observe only very little adsorption of ethane on Pt at 0.5 V and no adsorption at 0.6 V 45. At the higher potential range of the cathode of a fuel cell there might be no significant influence of ethane.…”

“…However, there are hardly any studies dealing with the influence of aliphatic compounds on fuel cells. 45 studied the potentiodynamic electrosorption of ethane on platinum at different temperatures. It was found that depending on potential and temperature there are three different adsorbed ethane‐related species.…”

“…It was found that depending on potential and temperature there are three different adsorbed ethane‐related species. At low temperatures a dehydrogenation of ethane is leading to adsorbed C 2 H 2 45. At high temperatures oxidation processes overweigh, leading to CO, COH and subsequently a desorption of CO 2 45.…”