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The γ-MnO2@CNT catalyst was prepared by in situ solid phase synthesis and first applied into sodium-air batteries (SABs). The initial discharge specific capacity of SABs with γ-MnO2@CNT catalyst can reach 8804 mA h g−1 and the overpotential gap is only 140 mV, which is better than the batteries that is catalyzed by α-MnO2@CNT and pure CNT. Besides, the batteries also exhibit excellent cycle performance,...
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