In this study, we proposed high-performance chemically regenerative redox fuel cells (CRRFCs) using NO3-/NO with a nitrogen-doped carbon-felt electrode and a chemical regeneration reaction of NO to NO3- via O-2. The electrochemical cell using the nitrate reduction to NO at the cathode on the carbon felt and oxidation of H-2 as a fuel at the anode showed a maximal power density of 730 mW cm(-2) at 80 degrees C and twofold higher power density of 512 mW cm(-2) at 0.8 V, than the target power density of 250 mW cm(-2) at 0.8 V in the H-2/O-2 proton exchange membrane fuel cells (PEMFCs). During the operation of the CRRFCs with the chemical regeneration reactor for 30 days, the CRRFCs maintained 60 of the initial performance with a regeneration efficiency of about 92.9 and immediately returned to the initial value when supplied with fresh HNO3.
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