Study of an Innovative Energy Storage and Recovery System based on the W/WO3 Oxidoreduction Reaction

• Main Authors: Haboury, Romain, Zink, Peter A., Pal, Uday B., Gopalan, Srikanth, Basu, Soumendra N.
• Format: Conference Proceeding
• Language: English
• ISSN: 1938-5862; 1938-6737
• DOI: 10.1149/1.4729182

Energy storage and recovery using the redox reaction is proposed. The system will store energy as tungsten metal (W) by reducing tungsten oxide with hydrogen. Thereafter steam will be used to re-oxidize the metal and recover hydrogen. The volumetric energy density of W for storing hydrogen is 21kWh/L of W based on the LHV of hydrogen. Theoretical treatment of isothermal kinetics has been extended in the present work to the reduction of tungsten oxide in powder beds. Experiments were carried out using a thermogravimetric technique under isothermal conditions at different temperatures. The reactions at 800°C were found to take place in the following sequence: WO3→WO2.9→WO2.72→WO2→W. Expressions for the last three reaction rate constants and activation energies have been calculated based on a model in which the intermediate reactions proceed as a front moving at a certain velocity while the first reaction occurs simultaneously in the entire bulk of the oxide.