A non-aqueous Na-oxygen battery utilizes a gas mixture of CO.sub.2 and O.sub.2 as fuel. The battery exhibits a comparatively high specific energy of 6500-7000 Whkg.sup.-1 over a range of CO.sub.2 feed compositions. The energy density achieved is higher, by 200% to 300%, than obtained with pure oxygen feed. Ex-situ FTIR and XRD analysis confirm Na2O2, Na.sub.2C.sub.2O.sub.4 and Na.sub.2CO.sub.3 as discharge products. The Na--O.sub.2/CO.sub.2 battery provides a promising approach for CO.sub.2 capture and conversion into electrical energy. The Na--O.sub.2/CO.sub.2 battery may be extended to other metals. In addition, operation of a metal battery fueled at least in-part by carbon dioxide within an optimal temperature range is considered.
STATEMENT OF GOVERNMENT INTEREST
 The research undertaken within the context of the embodiments as described herein, and the invention as claimed herein, was supported by the United States Department of Energy through the Energy Materials Center at Cornell University, under award number DE-SC0001086. The United States Government may have rights with respect to the invention as claimed herein.