With the ever-increasing growth in next-generation flexible and wearable electronics, fiber-shaped zinc-air batteries have attracted considerable attention due to their advantages of high energy density and low cost, though their development, however, has been seriously hampered by the unavailability of efficient electrocatalysts. In this work, we designed a trimetallic nitride electrocatalyst in an unusual molecular sheet form, which was stabilized by metallic titanium carbide sheets. Besides the expected elevation in catalytic activity toward the oxygen evolution reaction, the material simultaneously unlocked excellent catalytic activity for oxygen reduction reaction with the half-wave potential as small as 0.84 V. A flexible fiber-shaped zinc-air battery, employing the designed electrocatalyst as the air cathode and a gel as the electrolyte, demonstrated an enhanced and durable electrochemical performance, outputting a competitive energy density of 627 Wh kg_zn^–1. This work opens new avenues for utilizing two-dimensional sheets in future wearable and portable device applications.

中文翻译：

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碳化钛稳定的分子薄氮化物片材，作为纤维状可充电锌空气电池的高效双功能电催化剂

随着下一代柔性和可穿戴电子产品的不断增长，纤维状锌-空气电池由于具有高能量密度和低成本的优点而受到了广泛的关注，尽管它们的发展已受到严重阻碍。无法获得有效的电催化剂。在这项工作中，我们设计了一种不寻常的分子片形式的三金属氮化物电催化剂，并通过金属碳化钛片对其进行了稳定。除了预期的对氧气释放反应的催化活性提高外，该材料还以低至0.84 V的半波电位释放了出色的氧气还原反应催化活性。柔性纤维状锌空气电池，采用设计的电催化剂作为空气阴极和凝胶作为电解质，_zn ^–1。这项工作为在将来的可穿戴和便携式设备应用中利用二维片材开辟了新途径。