Abstract
A self-supported direct borohydride-hydrogen peroxide fuel cell system with internal manifolds and an auxiliary control unit is reported. The system, while operating under ambient conditions, delivers a peak power of 40 W with about 2 W to run the auxiliary control unit. A critical cause and effect analysis, on the data for single cells and stack, suggests the optimum concentrations of fuel and oxidant to be 8 wt. % NaBH4 and 2 M H2O2, respectively in extending the operating time of the system. Such a fuel cell system is ideally suited for submersible and aerospace applications where anaerobic conditions prevail.
Highlights
Polymer electrolyte fuel cells (PEFCs) employ hydrogen as fuel
The hydrogen generated by such a process contains carbon monoxide, which even at miniscule levels can poison the platinum catalyst affecting the performance of the PEFCs
We report a self-supported 40W alkaline NaBH4/acidic H2O2 direct borohydride fuel cell (DBFC) system with internal manifolds and an auxiliary control unit
Summary
Polymer electrolyte fuel cells (PEFCs) employ hydrogen as fuel. But hydrogen is not available freely in Nature and needs to be generated. %, is the most attractive liquid fuel [4], but PEFCs fuelled directly with methanol suffer from methanol crossover from anode to cathode across the polymer-membrane electrolyte that affects the cell performance. Such fuel cells have the inherent limitations of low open-circuit-potential and low electrochemical-activity [5]. H2O2 as oxidant provide high operating voltages and power densities, and are especially useful for submersible and space applications where anaerobic conditions prevail [8,9,10,11] In this communication, we report a self-supported 40W alkaline NaBH4/acidic H2O2 DBFC system with internal manifolds and an auxiliary control unit. An attempt is made to achieve the optimum fuel and oxidant concentrations to attain maximum operation time
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