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Page 65
November 13-14, 2017 Paris, France
5th International Conference on
PLASMA CHEMISTRY AND
PLASMA PROCESSING
Journal of Biotechnology and Phytochemistry
Volume 1, Issue 2 Plasma Chemistry 2017
China’s surface modification of metallic
bipolar plates of PEMFC: from basic materials
to the application technology development
Aimin Wu, Guoqiang Lin, Hao Huang and Chuang Dong
Dalian University of Technology, China
The proton exchange membrane fuel cells (PEMFC) can
be considered as an ideal power source for stationary
cogeneration systems and for fuel cell vehicles (FCV). The
bipolar plate is the most important component and major
part in PEMFC stack manufacturing, and it contribute 60%-
80% of the total components of PEMFC stack. The bipolar
plates are typically made from conductive metallic, carbon
and polymeric materials. The measurements obtained for
electrical conductivity (>100 Scm-1), impact strength (>40.5
Jm-1), thermal conductivity (>10 Wm-1 K-1), interfacial
contact resistance (<10 mΩ cm2) and current densities for
corrosion resistance (<1 μA cm-2) are based on DOE targets.
Although graphite has excellent chemical stability and
good electrical conductivity, but the high processing cost of
graphite bipolar plates inhibits its use for PEMFC. Metallic
materials, such as stainless steel (SS) with surface coated have
been used in fabricating bipolar plates for PEMFC to achieve
specifications that are low cost, safer and highly stable. This
work will introduce the research and application of the
surface modification technology of the metal bipolar plate
for PEMFC in China. Continuous Supported by the National
High-tech R&D Program (863 Program) of China, a series
of modified films on commercial SS316L plates with different
chemical compositions and structures, such as NiCr, CrN,
CrC single layer, and NiCr/(NiCr)N, Cr/CrNx/Cr multilayer,
were carried out.The research result showed that, coating of SS
bipolar plates can improve the corrosion resistance of metallic
bipolar plates. Excellent performance of bipolar plates was
recorded by using Cr0.23C0.77 coating for SS materials. The
ICR value was 2.8 mΩ cm2 with a low current density (Icorr)
0.091 μA cm-2. And the Cr0.50N0.50 coating also shows well
performance with ICR value 5.8 mΩ cm2 and Icorr value 0.59
μA cm-2. The criteria for both current densities (<1 μA cm-
2) and electrical conductivity (<10 mΩ cm2) met the DOE's
2020 technical targets. The PEMFC stack assembled with this
Cr0.23C0.77 coated SS bipolar plate was successfully applied
to the fuel cell vehicles and used as the designated VIP car in
2010 Shanghai World Expo.
J Biot Phyt 2017