Spatial proton exchange membrane fuel cell performance under carbon monoxide poisoning at a low concentration using a segmented cell system

Effect of fuel utilization on the carbon monoxide poisoning dynamics of Polymer Electrolyte Membrane Fuel Cells

“…It is important to highlight that modeling results by Bonnet et al [24] are not in accordance with the experimental results of other authors [20,35,46] who used a segmented PEMFC [47] and observed a lower current density close to the inlet for similar fuel utilizations. More experimental work is needed in order to analyze the effect of fuel utilization on the distribution of CO within the cell.…”

“…5 may provide insight regarding the effect of fuel utilization on the CO distribution profile within the cell. The distribution of CO within the cell has been studied both experimentally [20,23,35,46] and numerically [23,24]. The numeric study by Bonnet et al [24] shows the effect of CO on the current density distribution, the fraction of catalytic sites covered by CO and the anode overpotential.…”

“…17% [17], 50% [14,15,[18][19][20] or 70% [13,21], not corresponding to actual PEMFC systems that may operate on a wide range of fuel utilizations [4,22]. The effect of fuel utilization on CO poisoning has been studied numerically for CO concentrations ≥ 10 ppm [16,23] and CO concentrations in the range 1-5 ppm [24].…”

“…The most representative studies on CO poisoning have been performed using single cells for which the excess exhaust gas is vented to atmosphere [13][14][15][16][17][18][19][20][21]. Nevertheless, the CO poisoning dynamics is expected to be different in actual automotive PEMFC systems where the fuel is delivered in dead end mode with recirculation [25][26][27][28][29] (Fig.…”

Instabilidades cinéticas em células a combustível - oscilações de potencial em PEMFC com ânodo de Pd-Pt/C ou Pd/C e em DMFC

“…Síntese de melhores eletrocatalisadores para oxidação de H 2 na presença de CO [2] ou para reação de redução de O 2 [3], estudos mecanísticos da eletrooxidação de moléculas orgânicas usadas como combustível (metanol, etanol, ácido fórmico) [4], transporte dos reagentes pela camada de difusão [5], distribuição de corrente ao longo dos eletrodos [6,7], durabilidade [8], entre vários outros quesitos são desafios que trazem à tona questões multidisciplinares em Ciência. Concomitantemente, o estudo desses dispositivos não é apenas de interesse fundamental, mas é também essencial para torná-los viáveis.…”