Step response analysis of phosphoric acid fuel cell (PAFC) cathode through a transient model

A simple analytical approach to simulate the electrochemical impedance response of flooded agglomerates in polymer fuel cells

“…To prove the validity of the hypothesis in PEM models, in Table 2 agglomerate characteristic frequency f 0 is reported for PEMFC, PAFC and HT-PEMFC agglomerate data from the literature [6,12,13,[16][17][18][19][20][21][22][23]. If the agglomerate radius is lower than 500 nm, f 0 is in the order of 1 kHz-1 MHz, thus higher than cathode charge transfer typical frequency range (10-100 Hz).…”

“…5 the AC effectiveness factors are plotted as a function of the Thiele Modulus for three geometries. While increasing the [19] 85.0 100 0.5 a 3Á10 5 2011 Sousa [21] 3.50 500 0.3 7Á10 2 2010 Gerteisen [20] 0.50 200 0.4 5Á10 2 2009 Gerteisen [13] 20.0 100 0.5 a 6Á10 3 2007 Choudhury [17] 100.0 1000 0.5 a 3Á10 3 2006 Shah [18] 0 Thiele modulus, the AC effectiveness factors decrease from a value of 1 with a very fast decrease around f n = 1, consistently with what already known regarding the steady state effectiveness factor. Differences between considered geometries become evident, since higher catalyst utilization is obtained in the spherical geometry.…”

Various control schemes of power management for phosphoric acid fuel cell system

“…At higher current density, the cell potential decreases rapidly due to mass limitation [16,17]. This linearity is termed as the concentration over potential and shown in Eq.…”

Maximum power output and load matching of a phosphoric acid fuel cell-thermoelectric generator hybrid system

“…Using Eqs. (16) and (17), one can plot the curves of R * f and R * g varying with i, as shown in Fig. 5, where R * f ¼ R f =r f and R * g ¼ R g =r, and ðR * f Þ opt and ðR * g Þ opt are the values of R * f and R * g at the maximum power output density.…”