2017 FUEL CELL SEMINAR&ENERGY EXPOSITION, November 7-9, LB Convention Center, Los Angeles, CADevelopment of MEA with Self-water Management
on PEFC to reduce the manufacturing cost
Ikuya OTA, Kimihiko Sugiura

Tomoko ITO, Kenji INUKAI, Mitsutsugu UTAKA

Osaka Prefecture University
College of Technology, JAPANAnaori Carbon Co.,Ltd

Experimental

Introduction
InletｔＧＤＬ

Experiment (A)Platinum is expensive

MEA
Standard Graphite① Graphite② Graphite③
Platinum content 38.0wt% 23.7wt%
21.7wt%19.0wt%Graphite content
37.5wt%42.9wt%50.0wt%Water management

Experiment (B)MEAStandard Graphite④ Graphite⑤ Graphite⑥
Particle size
105～250μm 74～105μm ～74μm
23.7wt%Platinum content 38.0wt%
Graphite content
37.5wt%OutletTo improve, We use
addition of carbon powder
to the catalyst layer

 Experimental condition
Full humidifying Non-humidifying
condition
condition
Full mass flow (Fuel gas utilization)
80 ml/min (70%)
Air mass flow (Fuel gas utilization)
334 ml/min (40%)
humidifier temperature
80℃
0℃
relative humidity
100%RH
0%RH
Cell temperature
80℃
19 ℃
Inner pressure
Atmosphere
Load current
0.3 A/cm²Conditions of Cole-Cole Plot
Frequency range
10,000～0.04 Hz
165 mA
Superimposed current

Graphite rubbish

NBH

Voltage [mV]

Ｍ Ｃｅ ａｍ ｔｂ ａｒ ｌａｎ ｙｅ ｓ

PEFC has problems

Activation polarization
Resistance polarization
Diffusion polarization
Current density [A/cm²]
Resistancepolarization

Reactance [mΩ]

ＣａＧ ｔａＤ ｌ
Ｌ ｙｓｔ

 Experimental apparatus
and each polarization

 Conditions of MEA

Activation
polarization

Diffusion
polarization

Resistance [mΩ]Results and Discussion

Under non-humidifying condition

Under full humidifying condition Experiment (A) Experiment (A)20

Pt /CB/Gr [wt%] IR[mΩ ]Standard 38.0/62.0/0.0
5.56
Graphite① 23.7/38.8/37.5
5.26
Graphite② 21.7/35.4/42.9
5.68
Graphite③ 19.0/31.0/50.0
4.55

100.2

0.3

00.4

102030

1000

50

60

Reactance[m Ω ]

800

700

IR[mΩ ]
5.56
5.79
4.79
4.96
0.3

Current density[A/cm2]

0.3

0

0.4

0p . s . [μ m]Standard
Graphite ④ 105～250
Graphite ⑤ 74～105
Graphite ⑥～7410204060

5060

Graphite rubbish
keeps water well !!

30

Tda/Tdc/Tc=-/-/19[℃]
25

800

5040

 Experiment (B)900

IR[mΩ ]
5.56
5.79
4.79
4.96

30

30

Tda/Tdc/Tc=-/-/19[℃]01020Resistance[mΩ ] The activation polarization ofGraphite ①, ②, ④, ⑤, ⑥ was
improved.

700

600

5010

 In the high current density range,cell voltage of Graphite ① , ②
exceeded the Standard.

500

0.40.2

Tda/Tdc/Tc=80/80/80[℃]150.20.1

1000

9000.1

10Current density[A/cm2]

20

Tda/Tdc/Tc=80/80/80[℃]

IR-Free[mV]

4000.0Success in cost reduction !!

 Experiment (B)

400
0.040

Cell performance
improved by adding
graphite rubbish !!

 The activation polarization of theMEA with graphite rubbish wasimproved.

500

155Resistance[mΩ ] Cell voltage of Graphite ①, ②, ④,⑤, ⑥ exceeded the Standard.

p . s . [μ m]Standard
Graphite ④ 105～250
Graphite ⑤ 74～105
Graphite ⑥～74

20

Tda/Tdc/Tc=-/-/19[℃]

Current density[A/cm2]

600

600

500

500.1

700

Pt /CB/Gr [wt%] IR[mΩ ]Standard 38.0/62.0/0.0
8.52
Graphite① 23.7/38.8/37.5
7.85
Graphite② 21.7/35.4/42.9
8.91
Graphite③ 19.0/31.0/50.0
5.42

25

Reactance[m Ω ]

400
0.0

15IR-Free[mV]

500

800

Tda/Tdc/Tc=-/-/19[℃]

Reactance[m Ω ]

800

900

Pt /CB/Gr [wt%] IR[mΩ ]Standard 38.0/62.0/0.0
5.56
Graphite① 23.7/38.8/37.5
5.26
Graphite② 21.7/35.4/42.9
5.68
Graphite③ 19.0/31.0/50.0
4.55

IR-Free[mV]25

Reactance[m Ω ]IR-Free[mV]

900

600

Pt /CB/Gr [wt%] IR[mΩ ]Standard 38.0/62.0/0.0
8.52
Graphite① 23.7/38.8/37.5
7.85
Graphite② 21.7/35.4/42.9
8.91
Graphite③ 19.0/31.0/50.0
5.42

Tda/Tdc/Tc=80/80/80[℃]

Tda/Tdc/Tc=80/80/80[℃]

700

30

1000301000

p . s . [μ m] IR[mΩ ]Standard
8.52
Graphite ④ 105～250
7.86
Graphite ⑤ 74～105
5.96
Graphite ⑥～74
10.65

400
0.0

0.1

0.2

0.3

p . s . [μ m]Standard
Graphite ④ 105～250
Graphite ⑤ 74～105
Graphite ⑥～74

2015

105

0.4

0010

Current density[A/cm2]

Resistance[mΩ ]SummaryIR[mΩ ]
8.52
7.86
5.96
10.65

203040Resistance[mΩ ]Acknowledgments

1. We confirmed that the performance of the cell including the MEA with graphite rubbish was exceeded of thecell including the MEA with the NBH.
2. By adding graphite to the catalyst layer, cost reduction and system efficiency can be improved.
3. Moreover, an optimal operating condition is different according to the addition of the added graphite.

Energy Laboratory

This work was supported
by JKA and its promotion
funds from AUTO RACE.

5060