• Hierarchical carbon microtube@nanotube (CMT@CNT) core–shell nanostructure is successfully synthesized.

• The CMT@CNT shows superior electrocatalytic activity for oxygen reduction reaction and oxygen evolution reaction.

• A mass-loading independent high performance for zinc–air battery is achieved on the CMT@CNT.

中文翻译：

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分层碳微管@纳米管核壳结构，用于高性能氧气电催化和锌空气电池

• 分层碳微管@纳米管（CMT @ CNT）核-壳纳米结构已成功合成。

• CMT @ CNT对氧还原反应和析氧反应具有优异的电催化活性。

• 在CMT @ CNT上实现了锌空气电池的独立于质量负载的高性能。