Chaoyang Sun , Fenglong Xiao , Di Wu , Gang Lian , Deliang Cui , Qilong Wang , Haohai Yu
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引用次数: 0
摘要
可充电锂离子电池由于其优越的高能量密度而显示出巨大的潜力。然而,实际应用仍然受到动力学缓慢的限制,导致循环性能差和高过电位。本文通过双金属叶状ZnCo-ZIFs的热解,探索了用碳纳米管将高度分散的Co纳米颗粒嵌入多孔n掺杂碳基体(DCo-NC)中。锌离子的蒸发和多孔碳基质的形成阻止了Co纳米粒子的聚集,暴露了更多的Co- n活性位点,并提供了丰富的孔隙。它们促进Li+和电子转移,防止Co纳米颗粒失活,并为Li2O2提供足够的空间,从而加速氧还原反应(ORR)/析氧反应(OER)动力学。因此,采用DCo-NC阴极的锂氧电池表现出过电位降低、放电容量高(在100 mA g - 1电流密度下放电容量为10490 mA h g - 1)和循环性能提高(在500 mA g - 1电流密度下循环258次,限制容量为500 mA h g - 1,在500 mA g - 1电流密度下循环103次,限制容量为1000 mA h g - 1)。
Co nanoparticles embedded into leaf-like porous carbon as a promising cathode catalyst for Li-O2 batteries
Rechargeable Li-O2 batteries show great potential due to their superior high energy density. However, the practical application is still limited by the sluggish kinetics, resulting in poor cycling performance and high overpotentials. Herein, highly dispersed Co nanoparticles embedded into porous N-doped carbon matrix (DCo-NC) with carbon nanotubes is explored through the pyrolysis of a bimetallic leaf-shaped ZnCo-ZIFs. The evaporation of Zn species and porous carbon matrix derived from ZIFs prevents the Co nanoparticles aggregation, exposes more Co-N active sites and provides abundant pores. They facilitate Li+ and electron transfer, prevent Co nanoparticles from deactivation and provide enough space for Li2O2, thereby accelerating oxygen reduction reaction (ORR)/oxygen evolution reaction (OER) kinetics. Accordingly, the Li-O2 batteries with DCo-NC cathode exhibit reduced overpotential, high discharge capacity (10,490 mA h g−1 at 100 mA g−1 current density) and improved cycling performance (258 cycles at 500 mA g−1 with a limited capacity of 500 mA h g−1, 103 cycles at 500 mA g−1 with a limited capacity of 1000 mA h g−1).
期刊介绍:
The Journal of Electroanalytical Chemistry is the foremost international journal devoted to the interdisciplinary subject of electrochemistry in all its aspects, theoretical as well as applied.
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