Performance Data of a Proton Exchange Membrane Fuel Cell Using  H 2 /  CO  as Fuel Gas

Abstract

The performance of a proton exchange membrane fuel cell (PEMFC) was evaluated at 80°C in H2 with defined amounts of CO (25 to 250 ppm) and pure oxygen. Membrane electrode assemblies (MEAs) were made using Nafion™ 117 with carbon‐supported dispersed Pt, Pt0.7Ru0.3 , and Pt0.5Ru0.5 as anode catalysts, and Pt as a cathode catalyst. For comparison the MEAs were first characterized in H2//O2 . In H2/CO//O2 steady‐state current‐voltage curves were obtained after a poisoning period. It was found that the performance of the cell depends strongly on the CO concentration and the anode catalyst used. For Pt0.5Ru0.5 as anode catalyst, the maximum power density in H2/CO//O2 was enhanced by a factor of four compared with a Pt anode catalyst. Using Pt0.5Ru0.5 no difference in power density was found between pure H2 and H2 /100 ppm CO up to current densities of about 0.4Acm−2 .

The Influence of Pt Loading, Support and Nafion Content on the Performance of Direct Methanol Fuel Cells: Examined on the Example of the Cathode

“…The synthesis of the Pt colloids was carried out in ethylene glycol (Anachemia, ACS grade) containing sodium hydroxide (EM Science, ACS grade). First, 0.4652 g of PtCl 4 (Alfa Aesar, 99.9% metals basis) was dissolved in 50 mL of ethylene glycol containing 0.115 M NaOH. The solution was stirred for 30 min.…”

“…0, [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15]However, the optimum N/C ratios are found to be lower, namely 0.7 and 0.5 for the VC and HG supports, respectively. The optimum N/C value using VC as catalyst support is essentially the same as reported by Liu and Song et al [19,20] i.e.…”

“…Due to the small particle size of the Pt, the EASA is expected to be larger for the 60 wt% Pt/C catalysts than the other Pt/C loadings. It is well known that uniform distribution of the catalyst particles and an optimum, 'small' catalyst particle size are important factors for the stable and efficient operation of FCs [3][4][5]. For the ORR, an optimal Pt particle size of ca.…”

Catalyst development for water–gas shift

“…[52,54] The selectivity of commercial Fe/Cr/Cu and a model 2% Pt/CeO 2 catalyst is compared in Figure 9. At moderately high space velocity the ceria catalyst operated at equilibrium but produced nearly 2% CH 4 was detected. The selectivity at high temperatures is even more critical when considering fuel processors will have to operate at 5-100% power ratings.…”

“…Latest technology anodes are typically tolerant up to 100 ppm CO in the feed gas but the typical reformate coming from a fuel processor contains hydrogen, carbon dioxide and 1-3 vol% of carbon monoxide. [3][4][5] In order to minimize the reformate CO concentration for PEM fuel cell applications, methanation of the excess CO, the selective oxidation in the presence of oxygen or water has been considered. The topic of the following summary is the oxidation reaction of carbon monoxide with steam herein referred to as the water gas shift (WGS) reaction.…”