دانلود رایگان مقاله مشخصات طراحی سیستم سلول سوختی مستقیم بوروهیدرید هیدروژن پراکسید

Abstract

The design specifications of a direct borohydride–hydrogen peroxide fuel cell (DBPFC) system for space missions were determined based on the energy density. A unit cell test of the DBPFC with electrocatalysts supported on multiwalled carbon nanotubes was conducted to evaluate the DBPFC performance. A relationship between the current density and voltage was obtained from the test results to estimate the total mass and energy density of the DBPFC system. The effects of changing the voltage efficiency and fuel concentrations on the total mass of the DBPFC system were investigated to determine the appropriate design specifications for space missions. When the voltage efficiency was 35%, the system mass was the lowest, regardless of the fuel concentrations. Finally, the energy density of the DBPFC system operating at the optimum voltage efficiency was calculated at various fuel concentrations. When the NaBH4 and H2O2 concentrations are higher than 20 and 65 wt%, respectively, the energy density (>400 Wh/kg) of the DBPFC system is higher than those of other power sources and the DBPFC system can be widely used for space missions.

4. Conclusions

The performance of the DBPFC with electrocatalysts supported on MWNCTs was evaluated to determine the design specifications of the DBPFC system for space missions. A relationship between current density and voltage was determined from the experimental data. The effect of voltage efficiency and fuel concentrations on the total mass of the DBPFC system was investigated using the relationship. The total mass of the DBPFC system was the lowest at 35% voltage efficiency, regardless of the fuel concentrations. As a result, the energy density of the DBPFC system operating at this voltage efficiency can be determined using only the fuel con-centrations. Finally, the energy density of the DBPFC system was calculated at various fuel concentrations. The design specifications of the DBPFC system for space missions were determined based on the estimated energy density. If the NaBH4 and H2O2 concentrations are increased to 20 and 65 wt%, respectively, the energy density of the DBPFC system will be higher than 400 Wh/kg and the DBPFC system can be widely used for space missions. This study provides a performance target to develop the DBPFC system for space missions.