Results showed that the ORR electrocatalytic activities of MnMn-ON/C-Air-HA300, MnMn-ON/C-Air-HA400, and MnMn-ON/C-Air-HA500 exhibited an increasing trend, with MnMn-ON/C-Air-HA500 achieving half-wave potential and limiting current density slightly inferior to MnMn-ON/C.
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A universal N<sub>2</sub>O<sub>4</sub>-cavity strategy for precisely spaced, durable dual-atom ORR catalysts.
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