Synthesis of boron/nitrogen substituted carbons for aqueous asymmetric capacitors

Timothy Tomko, Ramakrishnan Rajagopalan, Parvana Aksoy, Henry C. Foley

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Abstract

Boron/nitrogen substituted carbons were synthesized by co-pyrolysis of polyborazylene/coal tar pitch blends to yield a carbon with a boron and nitrogen content of 14 at% and 10 at%, respectively. The presence of heteroatoms in these carbons shifted the hydrogen evolution overpotential to -1.4 V vs Ag/AgCl in aqueous electrolytes, providing a large electrochemical potential window (∼2.4 V) as well as a specific capacitance of 0.6 F/m2. An asymmetric capacitor was fabricated using the as-prepared low surface area carbon as the negative electrode along with a redox active manganese dioxide as the positive electrode. The energy density of the capacitor exceeded 10 Wh/kg at a power density of 1 kW/kg and had a cycle life greater than 1000 cycles.

Original languageEnglish (US)
Pages (from-to)5369-5375
Number of pages7
JournalElectrochimica Acta
Volume56
Issue number15
DOIs
Publication statusPublished - Jun 1 2011

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All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Electrochemistry

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