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Figure 4 is a battery temperature of 353 K, humidification temperature of 333 K, current density of 1.08 A/cm2, the cathode catalyst layer of the impedance distribution. Map can be seen along the direction of the gas channel, impedance lower hp pavilion dv1000 battery, hp pavilion dv4000 battery. Electrochemical reaction to generate because of the water channel in the direction of gas accumulation, so that moisture content gradually improve, reduce the proton transfer resistance. Catalyst layer from the diffusion layer of proton exchange membrane side to side, reduce the impedance. Mainly because it is near the proton exchange membrane side of the high-speed electrochemical reaction to generate many of the water, proton exchange hp pf723a, hp pm579a membrane components in higher water content, lower resistance to proton transfer.
Figure 5 is a battery heating temperature 353 K, humidification temperature of 333K, current density of 1.08 A/cm2, the cathode catalyst layer temperature distribution. Map can be seen: in the gas-channel direction, temperature hp pavilion ze2000 battery, hp presario m2000 battery is gradually reduced. The main reason is the oxygen volume fraction and effective porosity reduced, resulting in reduced speed of electrochemical reaction. Catalyst layer from the diffusion layer of proton exchange membrane side to side temperature. The main reason is the near side of proton exchange membrane, the proton concentration of large, high-speed electrochemical reaction resulting in a higher temperature.
3 Conclusion
(1) in a simulated known conditions, the proton hp presario v2000 battery, hp pavilion dv2000 battery transfer is the cathode catalyst layer mass transfer control process;
(2) the direction along the gas channel, cathode catalyst layer of oxygen concentration, temperature, impedance and current density were gradually reduced;
(3) from the diffusion layer side to the side of proton exchange membrane, catalyst layer of oxygen volume fraction, temperature and impedance to reduce, and the current density hp laptop battery increased.
