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The effects of operating conditions on the performance of a direct carbon fuel cell

Kacprzak A., Kobylecki R., Bis Z.

Archives of Thermodynamics

2013

Vol. 34, no. 4

187--197

The influences of various operating conditions including cathode inlet air flow rate, electrolyte temperature and fuel particles size on the performance of the direct carbon fuel cell DCFC were presented and discussed in this paper. The experimental results indicated that the cell performance was enhanced with increases of the cathode inlet gas flow rate and cell temperature. Binary alkali hydroxide mixture (NaOH-LiOH, 90-10 mol%) was used as electrolyte and the biochar of apple tree origin carbonized at 873 K was used as fuel. Low melting temperature of the electrolyte and its good ionic conductivity enabled to operate the DCFC at medium temperatures of 723-773 K. The highest current density (601 A m-2) was obtained for temperature 773 K and air flow rate 8.3 x 106 m3s-1. It was shown that too low or too high air flow rates negatively affect the cell performance. The results also indicated that the operation of the DCFC could be improved by proper selection of the fuel particle size.

Węglowe ogniwo paliwowe - wysokosprawne źródło czystej energii elektrycznej

Kobylecki R., Bis Z.

Polityka Energetyczna

2008

T. 11, z. 1

219-226

W pracy przedstawiono wyniki wstępnych badań warunków pracy prototypowego ogniwa paliwowego zasilanego biocarbonem uzyskanym w wyniku termicznej waloryzacji biomasy. Badaniu poddano biocarbon o różnym stopniu uwęglenia oraz granulacji. W oparciu o uzyskane w trakcie badań charakterystyki prądowo-napięciowe można stwierdzić, że pracujące ogniwo generuje stabilne napięcie >1V, przy natężeniu prądu płynącego w obwodzie około 30mA.

The preliminary results of the operation of a prototype biocarbon fuel cell are presented in this paper. The biocarbon for the fuel cell is produced from biomass via its autothermal upgrading process. The effect of two biocarbon parameters, i.e. its carbon content and granulation are discussed. It is demonstrated that the fuel cell can be operated in a steady-state generating voltage of over 1V and the electric current of roughly 30mA.