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首页> 外文期刊>RSC Advances >A mesoporous tungsten carbide nanostructure as a promising cathode catalyst decreases overpotential in Li–O2 batteries
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A mesoporous tungsten carbide nanostructure as a promising cathode catalyst decreases overpotential in Li–O2 batteries

机译：介孔碳化钨纳米结构作为有希望的阴极催化剂可减少Li-O2电池中的过电势

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Lithium–oxygen (Li–O _(2) ) batteries as promising energy storage devices possess high gravimetric energy density and low emission. However, poor reversibility of electrochemical reactions at the cathode significantly affects the electrochemical properties of nonaqueous Li–O _(2) batteries, and low charge–discharge efficiency also results in short cycle-life. In this work, functional air cathodes containing mesoporous tungsten carbide nanoparticles for improving the reversibility of positive reactions in Li–O _(2) cells are designed. Mesoporous tungsten carbides are synthesized with mesoporous carbon nitride as the reactive template and carbon source. And mesoporous tungsten carbides in cathode materials display better electrochemical performance in Li–O _(2) cells in comparison with mesoporous carbon nitride and hard carbon. Tungsten carbide-1 (WC-1) with larger specific surface area promotes reversible formation and decomposition of Li _(2) O _(2) at the cathode and lower charge overpotential (about 0.93 V) at 100 mA g ~(?1) , which allows the Li–O _(2) cell to run up to 100 cycles. In addition, synergistic interaction between WC-1 and LiI could further decrease the charging overpotentials of Li–O _(2) cells and improve the charge–discharge performances of the Li–O _(2) cells. These results indicate that mesoporous electrocatalysts can be utilized as promising functional materials for Li–O _(2) cells to decrease overpotentials.
机译：锂-氧（Li-O _（2））电池作为有前途的储能设备，具有高重量能量密度和低排放量。但是，阴极上电化学反应的可逆性差会严重影响非水Li–O _（2）电池的电化学性能，而低的充放电效率也会导致较短的循环寿命。在这项工作中，设计了包含中孔碳化钨纳米粒子的功能性空气阴极，以改善Li–O _（2）电池中正反应的可逆性。以介孔氮化碳为反应性模板和碳源合成介孔碳化钨。与中孔氮化碳和硬碳相比，正极材料中的中孔碳化钨在Li–O _（2）电池中显示出更好的电化学性能。具有较大比表面积的碳化钨-1（WC-1）促进了Li _（2）O _（2）在阴极的可逆形成和分解，并在100 mA g〜（？1）时具有较低的电荷超电势（约0.93 V） ），这使Li–O _（2）电池最多可以运行100个周期。此外，WC-1和LiI之间的协同相互作用可以进一步减少Li–O _（2）电池的充电超电势，并改善Li–O _（2）电池的充电-放电性能。这些结果表明，介孔电催化剂可用作Li–O _（2）电池减少过电势的有前途的功能材料。

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