A noble-metal-free catalyst based on both Mn₃O₄ and MnO was prepared by using the dielectric barrier discharge technique at moderate temperature. The prepared catalyst shows a higher electrocatalytic activity towards the oxygen reduction reaction than the catalyst prepared by using the traditional calcination process. The enhanced activity could be due to the coexistence of manganese ions with different valences, the higher oxygen adsorption capacity, and the suppressed aggregation of the catalyst nanoparticles at moderate temperature. The present work would open a new way to prepare low-cost and noble-metal-free catalysts at moderate temperature for more efficient electrocatalysis.

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通过在中等温度下使用介电势垒放电技术，制备了基于Mn ₃ O ₄和MnO的无贵金属催化剂。所制备的催化剂对氧还原反应的电催化活性高于使用传统煅烧工艺制备的催化剂。活性的提高可能是由于具有不同化合价的锰离子共存，较高的氧吸附能力以及在中等温度下抑制了催化剂纳米颗粒的聚集。当前的工作将为在中温下制备低成本且不含贵金属的催化剂开辟新途径，以实现更有效的电催化。

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