Carbon Supported Nanocrystalline Manganese Oxide: Surpassing Platinum as Oxygen Reduction Catalyst in Direct Borohydride Fuel Cells

Christoph Grimmer, Maximilian Grandi, Robert Zacharias, Stephan Weinberger, Alexander Schenk, Enes Aksamija, Franz-Andreas Mautner, Brigitte Bitschnau, Viktor Hacker

Research output: Contribution to journalArticleResearchpeer-review

Abstract

Manganese oxide (MnO2) nanodispersed on high surface area carbon was tested as cathode catalyst for direct borohydride fuel cells with an anion conducting membrane. In order to investigate the effects of borohydride crossover, ex-situ experiments toward oxygen reduction reaction were conducted employing rotating disk electrodes in presence of borohydride and thiourea. Although platinum showed superior catalytic properties at ideal conditions, manganese oxide outperformed platinum significantly in presence of borohydride. Direct borohydride fuel cell tests were conducted using Pt/C-based and MnO2/C-based. After one hour of operation at 0.40 V the platinum based membrane electrode assembly lost approx. 30% of its initial peak power density while the non-precious metal MEA showed constant performance. The peak power density of the single test cell with a Pt/C based anode, an anion exchange membrane and a MnO2/C based cathode was 38 mW cm−2.
Original languageEnglish
Pages (from-to)F885-F890
JournalJournal of the Electrochemical Society
Volume163
Issue number8
Publication statusPublished - 2016

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Direct borohydride fuel cells (DBFC)
Borohydrides
Manganese oxide
Platinum
Carbon
Oxygen
Membranes
Catalysts
Anions
Cathodes
Negative ions
Thiourea
Electrodes
Thioureas
Rotating disks
Ion exchange
Anodes
Metals
manganese oxide
Experiments

Keywords

  • Direct borohydride fuel cells
  • Platinum free catalyst

Fields of Expertise

  • Sustainable Systems

Cite this

Carbon Supported Nanocrystalline Manganese Oxide: Surpassing Platinum as Oxygen Reduction Catalyst in Direct Borohydride Fuel Cells. / Grimmer, Christoph; Grandi, Maximilian; Zacharias, Robert; Weinberger, Stephan; Schenk, Alexander; Aksamija, Enes; Mautner, Franz-Andreas; Bitschnau, Brigitte; Hacker, Viktor.

In: Journal of the Electrochemical Society, Vol. 163, No. 8, 2016, p. F885-F890.

Research output: Contribution to journalArticleResearchpeer-review

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abstract = "Manganese oxide (MnO2) nanodispersed on high surface area carbon was tested as cathode catalyst for direct borohydride fuel cells with an anion conducting membrane. In order to investigate the effects of borohydride crossover, ex-situ experiments toward oxygen reduction reaction were conducted employing rotating disk electrodes in presence of borohydride and thiourea. Although platinum showed superior catalytic properties at ideal conditions, manganese oxide outperformed platinum significantly in presence of borohydride. Direct borohydride fuel cell tests were conducted using Pt/C-based and MnO2/C-based. After one hour of operation at 0.40 V the platinum based membrane electrode assembly lost approx. 30{\%} of its initial peak power density while the non-precious metal MEA showed constant performance. The peak power density of the single test cell with a Pt/C based anode, an anion exchange membrane and a MnO2/C based cathode was 38 mW cm−2.",
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AU - Grimmer, Christoph

AU - Grandi, Maximilian

AU - Zacharias, Robert

AU - Weinberger, Stephan

AU - Schenk, Alexander

AU - Aksamija, Enes

AU - Mautner, Franz-Andreas

AU - Bitschnau, Brigitte

AU - Hacker, Viktor

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AB - Manganese oxide (MnO2) nanodispersed on high surface area carbon was tested as cathode catalyst for direct borohydride fuel cells with an anion conducting membrane. In order to investigate the effects of borohydride crossover, ex-situ experiments toward oxygen reduction reaction were conducted employing rotating disk electrodes in presence of borohydride and thiourea. Although platinum showed superior catalytic properties at ideal conditions, manganese oxide outperformed platinum significantly in presence of borohydride. Direct borohydride fuel cell tests were conducted using Pt/C-based and MnO2/C-based. After one hour of operation at 0.40 V the platinum based membrane electrode assembly lost approx. 30% of its initial peak power density while the non-precious metal MEA showed constant performance. The peak power density of the single test cell with a Pt/C based anode, an anion exchange membrane and a MnO2/C based cathode was 38 mW cm−2.

KW - Direct borohydride fuel cells

KW - Platinum free catalyst

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