Abstract
To alleviate the high polarization and short cycle lifetime of rechargeable Na–air batteries, ordered mesoporous carbon (OMC) was synthesized and evaluated as a nanostructured conductive matrix to host low-conductivity products generated during the discharge of Na–air batteries. The OMC had high specific surface area (1544m2/g) and a narrow pore size (2.7nm), with the voltage polarization of 1.5V, lower than that of the commonly used Super P carbon black (~1.8V). Although the carbonate-based electrolyte was decomposed to produce Na2CO3, the OMC cathode allowed reversible formation and decomposition of Na2CO3 and exhibited stable cycling behavior with low polarization for 20 cycles with a delivered capacity of 500mAh/g at the current density of 100mA/g.
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