Issue 15

Th to t cell Th effe low wit S T tem nam the cat C F Current densit [mA/cm 2 ] 200 400 580 Table 1 : P e voltage dist he temperatu s could be re e voltage non ct is strongl est voltage d h reformate f ACK TEMPE ig. 7 and mean te centr al a perature beh ed T1, T2 a stack middl hode air cool Figure 7 : Th urrent density y Me volt 0 0 0 erformance d ribution follo re dependen lated to the d -uniformity y associated ue to the co uels stack tem RATURE DI Fig. 8 s how mperature an nd end sta aviour. It is nd T3 (Fig. 7 e reaching 2 ing effect. In ermal image o 400 mA/cm 2 fuel: pur F an cell age [V] .63 .56 .50 ifferences at 2 ws a parabo t performanc ifferent reac becomes eve to cell tempe mbined effe perature dis STRIBUTION the temper d 400 mA/ ck parts (ab also possibl an d Fig. 9) . 5°C between fact, reactan f the 25 cells , mean stack te e hydrogen. igure 9 : Simpl N. Zuli hydrogen Mean cell pow density [mW/cm 2 ] 126 223 292 00 and 400 mA lic pattern th e of the sing tant distribut n more notic rature [17]. I ct of CO con tribution is c ature distribu cm 2 current out 20°C). e to observe T1 temperat T1 and T2 t air enters th HTPEM stack mperature 16 ification schem ani, Frattura ed er Stac pow [W 157 279 36 /cm 2 for the at is similar t le PBI/H 3 PO ion along the eable when f n this case th tent in the f rucial in orde tion along th density load The heat di the temper ure is the low . This tempe e stack from . 0°C, e of the air p °C Integrità Struttu k er ] Me volt 0 0 5 stack operatin o the stack t 4 based fuel stack. uels containi e first stack uel and low r to obtain b e stack ope . There is a spersion thr ature differen est compare rature behav the T1 sectio Figure 8 : Sta 400 mA/ ath through th 60 80 100 120 140 160 180 200 0 rale, 15 (2011) an cell age [V] .60 .51 - g with hydrog emperature p cell. Voltage ng CO are us cell (see red cell temperat est performa rating with p marked tem ough the en ces amongs d to T3 and iour could b n and leave ck temperatur cm 2 , mean sta fuel: pure h e fuel cell stac 50 100 29-34; DOI: 10 reformate Mean cell pow density [mW/cm 2 ] 119 204 - en and reform rofile (see Fi differences b ed. In fact th arrow in Fig ure. In the c nce. ure hydrogen perature dif d plates co t the 3 secti T2. Differen e explained from the T3 e profile. Curr ck temperature ydrogen. k. 150 mm .3221/IGF-ESIS.1 er Stac pow [W 14 25 - ate as fuel. g. 8) . This is etween adja e CO poison . 6) presents ase of opera at 160°C s ference betw uld explain ons of the s ces are highe referring to (Fig. 9) . ent density 160 °C, 200 T1 T2 T3 5.04 33 k er ] 9 5 due cent ing the ting tack een this tack r at the