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Anion- or Cation-Exchange Membranes for NaBH4/H2O2 Fuel Cells?
Materials Electrochemistry Group, Institute of Materials and Surfaces Science and Engineering, TU Lisbon, Av. Rovisco Pais, Lisbon 1049-001, Portugal
* Author to whom correspondence should be addressed.
Received: 7 May 2012; in revised form: 21 June 2012 / Accepted: 9 July 2012 / Published: 19 July 2012
Abstract: Direct borohydride fuel cells (DBFC), which operate on sodium borohydride (NaBH4) as the fuel, and hydrogen peroxide (H2O2) as the oxidant, are receiving increasing attention. This is due to their promising use as power sources for space and underwater applications, where air is not available and gas storage poses obvious problems. One key factor to improve the performance of DBFCs concerns the type of separator used. Both anion- and cation-exchange membranes may be considered as potential separators for DBFC. In the present paper, the effect of the membrane type on the performance of laboratory NaBH4/H2O2 fuel cells using Pt electrodes is studied at room temperature. Two commercial ion-exchange membranes from Membranes International Inc., an anion-exchange membrane (AMI-7001S) and a cation-exchange membrane (CMI-7000S), are tested as ionic separators for the DBFC. The membranes are compared directly by the observation and analysis of the corresponding DBFC’s performance. Cell polarization, power density, stability, and durability tests are used in the membranes’ evaluation. Energy densities and specific capacities are estimated. Most tests conducted, clearly indicate a superior performance of the cation-exchange membranes over the anion-exchange membrane. The two membranes are also compared with several other previously tested commercial membranes. For long term cell operation, these membranes seem to outperform the stability of the benchmark Nafion membranes but further studies are still required to improve their instantaneous power load.
Keywords: anion-exchange membrane; cation-exchange membrane; direct borohydride fuel cell; cell performance; cell stability
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Cite This Article
MDPI and ACS Style
Šljukić, B.; Morais, A.L.; Santos, D.M.F.; Sequeira, C.A.C. Anion- or Cation-Exchange Membranes for NaBH4/H2O2 Fuel Cells? Membranes 2012, 2, 478-492.
Šljukić B, Morais AL, Santos DMF, Sequeira CAC. Anion- or Cation-Exchange Membranes for NaBH4/H2O2 Fuel Cells? Membranes. 2012; 2(3):478-492.
Šljukić, Biljana; Morais, Ana L.; Santos, Diogo M. F.; Sequeira, César A. C. 2012. "Anion- or Cation-Exchange Membranes for NaBH4/H2O2 Fuel Cells?" Membranes 2, no. 3: 478-492.