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Kim, Jae-Ho; Yonezawa, Susumu; Takashima, Masayuki
International journal of hydrogen energy, 2011, 2011-01-00, 20110101, Volume: 36, Issue: 2Journal Article
Graphite particles (80 μm) and PTFE particles (40 μm) were coated with Ni (18–50 wt.%) and PTFE fine particles (0.3 μm; 8 wt.%) via electroless Ni–PTFE composite plating. The conductivity of Ni–PTFE plated graphite (C/Ni–PTFE) and PTFE (PTFE/Ni–PTFE) particles increased with the Ni content. At 35 wt.% Ni content, the conductivity (300 Sm −1) of C/Ni–PTFE particles was about 2 times higher than that of PTFE/Ni–PTFE particles. The particles were pressed into plates under a pressure of 10–500 kg cm −2 and the plates were then subjected to heat treatment at 350 °C. The surface of C/Ni–PTFE plates contained infinitely many gaps of 0.01–20 μm; these gaps are useful as a pathway for reacting gases. The conductivities in a direction perpendicular and parallel to the C/Ni–PTFE plates were respectively about 3.5 times (510 Sm −1) and 16 times (48 × 10 3 Sm −1) higher than those of the PTFE/Ni–PTFE plates. Furthermore, the total pore volume (0.145 cm 3 g −1) of C/Ni–PTFE plates was higher than that of PTFE/Ni–PTFE plates, which improved the gas permeability of the former. The current density (84 mA cm −2 at 0.3 V) of C/Ni–PTFE electrode was about 2 times higher than that of PTFE/Ni–PTFE electrode. This increase in the current density might be attributed to the improvement in the total conductivity and gas permeability of C/Ni–PTFE electrode.
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