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- W3017243405 abstract "Direct borohydride fuel cells (DBFCs) can operate at double the voltage of proton exchange membrane fuel cells (PEMFCs) by employing an alkaline NaBH4 fuel feed and an acidic H2O2 oxidant feed. The pH-gradient-enabled microscale bipolar interface (PMBI) facilitates the creation and maintenance of an alkaline environment at the anode and an acidic environment at the cathode for the borohydride oxidation and peroxide reduction reactions. However, given the need to dissociate water at the interface to ensure ionic conduction, PMBI can be efficient only when anion exchange ionomer (AEI) moieties enable fast water transport for autoprotolysis. Herein, a series of polynorbornene-based AEIs with a range of water uptake values are examined to unravel the optimum water uptake required to enable high performance DBFCs. The DBFC with PMBI configuration containing the optimal AEI composition delivers a current density of 302 mA cm–2 at 1.5 V and a peak power density of 580 mW cm–2 at 1 V. This AEI composition exhibits high hydroxide ionic conductivity of 90.7 mS cm–1 at 80 °C with an IEC of 2.01 mequiv g–1 and demonstrates impressive chemical stability by retaining 98.75% of its initial ionic conductivity after immersion into anolyte (3 M KOH and 1.5 M NaBH4) at 70 °C for 536 h." @default.
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- W3017243405 date "2020-04-14" @default.
- W3017243405 modified "2023-10-16" @default.
- W3017243405 title "Influence of Water Transport Across Microscale Bipolar Interfaces on the Performance of Direct Borohydride Fuel Cells" @default.
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- W3017243405 doi "https://doi.org/10.1021/acsaem.0c00145" @default.
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