High efficiency electrical energy storage using a methane-oxygen solid oxide cell

David M. Bierschenk, James R. Wilson, Scott A. Barnett

Research output: Contribution to journalArticle

125 Scopus citations

Abstract

Reversible solid oxide cells (SOCs) are potentially useful for electrical energy storage due to their good storage scalability, but have not been seriously considered due to concerns over round-trip efficiency. Here we propose an SOC storage chemistry where the fuel cycles between H2O-CO 2-rich and CH4-H2-rich gases. The unique feature is the formation of CH4 during electrolysis, a less endothermic process than the usual H2- or CO-forming reactions, enabling improved efficiency. Thermodynamic calculations and preliminary experiments show that the CH4-rich storage chemistry is produced during SOC operation at reduced temperature (∼600 °C) and/or increased pressure (∼10 atm). Balance of plant storage system requirements are discussed briefly.

Original languageEnglish (US)
Pages (from-to)944-951
Number of pages8
JournalEnergy and Environmental Science
Volume4
Issue number3
DOIs
StatePublished - Mar 1 2011

ASJC Scopus subject areas

  • Environmental Chemistry
  • Renewable Energy, Sustainability and the Environment
  • Nuclear Energy and Engineering
  • Pollution

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