Abstract
In this study, synthetic graphite and carbon nanotube
(CNT) filled polyphenylene sulfide (PPS) based bipolar
plates are produced by using co-rotating twin-screw
extruder and injection molding. Graphite is the main
conductive filler and CNTs are used as bridging filler
between graphite particles. To improve the dispersion of
the fillers and the flow behavior of the composite,
titanate coupling agent (KR-TTS) is used. The
concentration effect of CNTs and coupling agent on the
properties of bipolar plates are examined. At 72.5 wt.%
total conductive filler concentration, by addition of 2.5
wt.% CNT and 3 wt.% KR-TTS; through-plane and in-plane
electrical conductivities increase from 1.42 S cm-1 to 20
S cm-1 and 6.4 S cm-1 to 57.3 S cm-1 respectively
compared to sample without CNTs and additive. Extruder
torque value and apparent viscosity of samples decrease
significantly with coupling agent and as a result; the
flow behavior is positively affected. Flexural strength
is improved 15% by addition of 1.25 wt.% CNT.
Differential scanning calorimeter (DSC) analysis shows
nucleating effect of conductive fillers on PPS matrix.
Corrosion measurements, cyclic voltammetry and
galvanostatic charge-discharge tests are performed to
examine the electrochemical stability and the performance
of produced bipolar plates in all-vanadium redox flow
battery
Original language | English |
---|---|
Pages (from-to) | 88-95 |
Journal | Journal of Power Sources |
Volume | 256 |
DOIs | |
Publication status | Published - 2014 |
MoE publication type | A1 Journal article-refereed |
Keywords
- Bipolar plate
- carbon nanotubes
- corrosion measurements
- polymer composite
- vanadium redox flow batter