Due to an unfortunate mistake, the publishers regret that Fig. 7 on p.196 of the above article was incorrect. The correct figure is shown below. The editorial team apologizes for any inconvenience this may have caused. 0 0,2 0,4 0,6 0 50 100 150 200 Temperature / ° C Conductivity / Scm-1 100%H3PO4 PPA-membrane, ADL=32, RH=0% Nafion 117, RH=95% DMAc-membrane, ADL=5.7 TFA-membrane, ADL=6, RH=5% PBI-1b, ADL=11, RH=10% Fig.7 Proton conductivity of acid doped PBI and PBI-1b blend membranes as a function of temperature. As a comparison, data for 100% phosphoric acid and Nafion 117 are also included. The PPA-cast membrane was with an acid doping level of 32 and at relative humidity of 0% [20]; The DMAc-cast membrane was with an acid doping level of 5.7 and under atmosphere with a water-to-air ratio of about 0.7 [6]; The TFA membrane was with an acid doping level of 6.0 and at relative humidity of 5% [7].

No abstract

The electrochemical promotion of catalytic methane oxidation was studied using a false(CH4,O2,normalArfalse),normalPt| polybenzimidazole false(PBIfalse)­H3PO4|normalPt,false(H2,normalArfalse) fuel cell at 135°C. It has been found that C2H2, CO2, and water are the main oxidation products. Without polarization the yield of C2H2 was 0.9% and the yield of CO2 was 7.3%. This means that C2 open-circuit selectivity was approximately 11%. Open-circuit voltage was around 0.6 V. It has been shown that the CH4→C2H2 catalytic reaction can be electrochemically promoted at negative polarization and exhibits a clear “volcano-type” promotion behavior, meaning that there was a maximum promotion effect at a polarization of −0.15 V, or 0.45 V catalyst potential vs. a hydrogen electrode (3.8% C2H2 yield). The catalytic rate enhancement ratio, rfalse(C2false)/rnormalofalse(C2false), at this maximum was 4.2. There was no C2H2 production at polarization ⩾0.1 and ⩽−0.3 V. The yield of C2H2 decreased with decreasing temperature. Dependence of CO2 yield on polarization also showed a “volcano-type” behavior with maximum yield of 8.3% at −0.15 V polarization. The catalytic rate enhancement ratio for CO2 production, rfalse(CO2false)/rnormalofalse(CO2false), at this maximum was 1.1, which means that this catalytic reaction is only slightly affected by the electrochemical polarization. This indicates that polarization especially affects the C2 selectivity of the catalyst. The obtained data was explained by the electrochemical production of Pt-H active centers at the electrolyte-catalyst-gaseous reactant interface false(λ≫1false). © 2002 The Electrochemical Society. All rights reserved.

The electrochemical promotion of catalytic NO reduction by hydrogen was studied using a (NO, H2, Ar), Pt polybenzimidazole false(PBIfalse)­H3PO4|normalPt, false(H2, Ar) fuel cell at 135°C. A mixture of NO/H2/normalAr was used as the working mixture at one electrode and a mixture of H2/normalAr was used as reference and counter gas at the other electrode. Products of NO reduction false(N2 and H2Ofalse) were analyzed by an on-line mass spectrometer. At high NO+H2+normalAr flow rate (17 mL/min; 17 and 354 mL/min, respectively, at atmospheric pressure) the maximum rate enhancement ratio was 4.65. At low NO+H2+normalAr flow rate (17 mL/min; 17 and 140 mL/min, respectively), NO reduction increased 20 times even without polarization compared to the high gas flow rate. The electrochemical promotion effect occurs at positive polarization with a maximum increase at approximately 0.08 V and with 1.5 times the zero polarization value. The promotion at the negative polarization can be attributed to the electrochemical production of the promoters. At low gas flow rates, a charge-induced change of the strength of chemisorptive bonds can take place. © 2003 The Electrochemical Society. All rights reserved.

Due to an unfortunate mistake, the publishers regret that Fig. 7 on p.196 of the above article was incorrect. The correct figure is shown below.The editorial team apologizes for any inconvenience this may have caused. PBI-1b, ADL=11, RH=10% Fig.7 Proton conductivity of acid doped PBI and PBI-1b blend membranes as a function of temperature. As a comparison, data for 100% phosphoric acid and Nafion 117 are also included. The PPA-cast membrane was with an acid doping level of 32 and at relative humidity of 0% [20]; The DMAc-cast membrane was with an acid doping level of 5.7 and under atmosphere with a water-to-air ratio of about 0.7 [6]; The TFA membrane was with an acid doping level of 6.0 and at relative humidity of 5% [7]. MISCELLANEOUS 374