ChemInform Abstract: Performance Study of a Fuel Cell Pt‐on‐C Anode in Presence of CO and CO₂, and Calculation of Adsorption Parameters for CO Poisoning.

Abstract

The polarization of a fuel cell Pt/ Canode has been mearsured under conditions similar to that of an operating fuel cell at atmospheric pressure (100 Wt.‐% H3PO4, 190°C) in the presence of H2 and mixtures of H2, CO2, and CO.

Producing H2‐rich gas from simulated biogas and applying the gas to a 50w PEFC stack

“…The higher the CO 2 fraction in the gas, the larger the performance loss was. This CO 2 ‐induced performance loss for fuel cell had been earlier reported in several works for anodes (Dhar et al, 1986; Wilson et al, 1993), and for single cells (de Bruijn et al, 2002; Ball et al, 2002). As regards to our tested PEFC stack, Figure 11 shows that the voltage output decreased from 14.4 to 13.3 V, indicating a power reduction from 57.5 to 53.2 W, with increasing the CO 2 fraction from 0 to 36 vol.…”

“…Two mechanisms were proposed for the influence of CO 2 on PEFC performance. The early study of Dhar et al (1986) on polarization voltages of a Pt‐C anode at temperatures for the alkali fuel cells (AFCs), revealed a great effect from diluting the hydrogen fuel. This diluting effect was then generally recognized until Wilson et al (1993) stressed a poisoning effect of CO‐like species formed via the reverse WGS and CO 2 electroreduction over Pt anode, under the PEFC operating conditions.…”

A High Temperature Polymer Electrolyte Membrane Fuel Cell Model for Reformate Gas

“…CO poisoning effects on Pt in phosphoric acids system have been studied by several groups [40,41,50,51]. There are two main effects of CO on anode performance; the first is a dilution effect already accounted for in the Butler-Volmer equation, and the other is a kinetic effect arising from a reduction in active surface area because of CO adsorption on the Pt surface.…”

“…with the poisoning and dilution effects of poisonous species (CO) does not add up to the simultaneous effects of a mixture of both species. This is explained by the CO coverage as proportional to ln ([CO]/[H 2 ]) [40,50], which means that any fall in hydrogen concentration, due to dilution by inert species, will lead to higher CO coverage at the same CO concentration and therefore enhance the poisoning effect. (iii) A 30 mV potential difference between pure hydrogen and the diesel reformate composition at a current density of 1.5 A cm −2 was obtained considering only the dilution effect for methane (Case 1), reflecting a fall in power density of 45 mW cm −2 .…”

Transient evolution of carbon monoxide poisoning effect of PBI membrane fuel cells

“…Firstly, operating temperature up to 200 • C can tolerate up to 3% CO in anode hydrogen fuel [7]. Dhar et al [8,9] indicates that CO adsorption at platinum catalysts occurs easily at low temperature. Thus, PBI membrane makes it possible to feed reformed gas directly into the fuel cell at elevated temperature and simplifies the fuel cell system.…”