The aim of this work is the performance study of a polimeric electrolyte membrane stack. Extreme conditions of temperature and relative humidity, such as those that may be found in practical situations (i.e., automotive), have been considered. The research has been developed by Department of Energetics of Politecnico di Milano in collaboration with Nuvera Fuel Cells Europe, under confidential agreement. In order to select the proper electrolyte that can be used to build a stack suitable for automotive applications, three different types of material have been tested in single fuel cells, under different conditions of temperature and relative humidity by mean of a climatic chamber. Both traditional (Nafion®) and new materials have been tested in single cells of 16cm2 of active area. The three electrolyte materials have been tested also by measuring the protonic conductance, in different conditions of relative humidity. After these tests, an electrolyte has been chosen that was made with a coated catalyst membrane having a thickness of 35μm, which has been used to build a six-cell stack with an active area of 500cm2. The performances of the stack have been evaluated, in continuous operation, with air temperatures ranging from 50°C to 40°C. A series of start-up tests has been carried out with an air temperature ranging between 0°C and 25°C.

1.
Appleby
,
A. J.
, and
Foulkes
,
F. R.
, 1989,
Fuel Cell Handbook
,
Van Nostrand Reinhold
, New York, see the Introduction and Historical Sketch, pp.
7
14
.
2.
U.S. DoE
, 2004,
Fuel Cell Handbook
,
7th ed.
,
EG & G Technical Services
.
3.
Larminie
,
J.
, and
Dicks
,
A.
, 2003,
Fuel Cell Systems Explained
,
2nd ed.
,
Wiley
, New York.
4.
Marchesi Fabio Rinaldi
,
R.
, 2004, “Fuel Cells: A Feasible Energetical Solution for Mobility,” Trasporti e territorio, No. 4 Dicembre.
5.
Macchi
,
E.
,
Campanari
,
S.
, and
Silva
,
P.
, 2005,
The Natural Gas Microcogeneration
,
Ed. Politecnico
, Milan (in Italian).
6.
Cappadonia
,
M.
,
Erning
,
J. W.
,
Niaki
,
S. M. S.
, and
Stimming
,
U.
, 1995, “
Conductance of Nafion 117 Membranes as a Function of Temperature and Water Content
,”
Solid State Ionics
0167-2738,
77
, pp.
65
69
.
7.
McDonald
,
R. C.
,
Mittelsteadt
,
C. K.
, and
Thompson
,
E. L.
, 2004, “
Effects of Deep Temperature Cycling on Nafion® 112 Membranes and Membrane Electrode Assemblies
,”
Fuel Cells
1615-6846,
4
(
3
), pp.
208
213
.
8.
Mari
,
C. M.
, 1998, “
Introduction to the Impedance Spettroscopy 1st Part
,” Dipartimento di Chimica Fisica ed Elettrochimica, Università di Milano (in Italian).
9.
Bonino
,
F.
, 1998, “
Introduction to the Impedance Spettroscopy 2nd, Part
,” Dipartimento di Chimica, Università “La Sapienza” di Roma (in Italian).
10.
Fiegna
,
A.
, 1998, Impedance Spettroscopy: Principles and Instrumentation, I.R.T.E.C. Faenza (in Italian).
11.
Chiodelli
,
G.
,
Magistris
,
A.
, and
Schiraldi
,
A.
, 1977, “
Complex Admittance of AgI-Ag Oxysalt High Conducting Solids
,”
Electrochim. Acta
0013-4686,
22
, pp.
689
692
.
12.
Ferloni
,
P.
,
Chiodelli
,
G.
,
Magistris
,
A.
, and
Sancsi
,
M.
, 1986, “
Ion Transport and Thermal Properties of Poly(Ethylene Oxide)-LiClO4 Polymer Electrolytes
,”
Solid State Ionics
0167-2738,
18 & 19
, pp.
265
269
.
13.
Hsu
,
W. Y.
,
Barkley
,
J. R.
, and
Meakin
,
P.
, 1980, “
Ion Percolation and Insulator-to-Conductor Transition in Nafion Perfluorosulfonic Acid Membranes
,”
Macromolecules
0024-9297,
13
(
1
), pp.
198
200
.
14.
Katahira
,
K.
,
Matsumoto
,
H.
,
Iwahara
,
H.
,
Koide
,
K.
, and
Iwamoto
,
T.
, 2001, “
A Solid Electrolyte Hydrogen Sensor With an Electrochemically-Supplied Hydrogen Standard
,”
Sens. Actuators, A
0924-4247,
73
(
2-3
), pp.
130
134
.
15.
Matsumoto
,
H.
,
Iida
,
Y.
,
Iwahara
,
H.
, 2000, “
Current Efficiency of Electrochemical Hydrogen Pumping Using a High-Temperature Proton Conductor SrCe0.95Yb0.05O3-α
,”
Solid State Ionics
0167-2738,
127
(
3-4
), pp.
345
349
.
You do not currently have access to this content.