Wu Zhihan, Wang Hao, Xiong Pan, Li Guohui, Qiu Tianlun, Gong Wen-Bin, Zhao Fangfang, Li Cuiling, Li Qingwen, Wang Guoxiu, Geng Fengxia
College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, China.
Soochow Institute for Energy and Materials Innovations, College of Energy, Soochow University, Suzhou 215006, China.
Nano Lett. 2020 Apr 8;20(4):2892-2898. doi: 10.1021/acs.nanolett.0c00717. Epub 2020 Mar 30.
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. This work opens new avenues for utilizing two-dimensional sheets in future wearable and portable device applications.
随着下一代柔性和可穿戴电子产品的不断发展，纤维状锌空气电池因其高能量密度和低成本的优势而备受关注，尽管其发展受到高效电催化剂缺乏的严重阻碍。在这项工作中，我们设计了一种具有不寻常分子片形式的三金属氮化物电催化剂，它由金属碳化钛片稳定。除了预期的对析氧反应催化活性的提高外，该材料同时还展现出对氧还原反应优异的催化活性，其半波电位低至0.84V。一种采用所设计的电催化剂作为空气阴极、凝胶作为电解质的柔性纤维状锌空气电池，展现出增强且持久的电化学性能，输出了具有竞争力的627Wh kg的能量密度。这项工作为二维片材在未来可穿戴和便携式设备应用中开辟了新途径。
