Influence of Water Transport Across Microscale Bipolar Interfaces on the Performance of Direct Borohydride Fuel Cells

Wang, Zhongyang; Mandal, Mrinmay; Sankarasubramanian, Shrihari; Huang, Garrett; Kohl, Paul A.; Ramani, Vijay K.

doi:10.1021/acsaem.0c00145

Influence of Water Transport Across Microscale Bipolar Interfaces on the Performance of Direct Borohydride Fuel Cells

Journal Article · Tue Apr 14 04:00:00 EDT 2020 · ACS Applied Energy Materials

DOI:https://doi.org/10.1021/acsaem.0c00145· OSTI ID:1799073

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Washington Univ., St. Louis, MO (United States); OSTI
Georgia Inst. of Technology, Atlanta, GA (United States)
Washington Univ., St. Louis, MO (United States)

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.

View Accepted Manuscript (DOE)

Research Organization:: Rensselaer Polytechnic Inst., Troy, NY (United States)

Sponsoring Organization:: USDOE Advanced Research Projects Agency - Energy (ARPA-E)

Grant/Contract Number:: AR0000769

OSTI ID:: 1799073

Journal Information:: ACS Applied Energy Materials, Journal Name: ACS Applied Energy Materials Journal Issue: 5 Vol. 3; ISSN 2574-0962

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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Influence of Water Transport Across Microscale Bipolar Interfaces on the Performance of Direct Borohydride Fuel Cells

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