【摘 要】
：
Bifunctional electrocatalysts with high activity toward both oxygen reduction and evolution reaction are highly desirable for rechargeable Zn-air batteries.Herein,a kind of carbon nanotube (CNT) supported single-site Fe-N-C catalyst was fabricated via pyr
【机 构】
：
Beijing National Laboratory for Molecular Sciences,Key Laboratory for the Physics and Chemistry of N
论文部分内容阅读
Bifunctional electrocatalysts with high activity toward both oxygen reduction and evolution reaction are highly desirable for rechargeable Zn-air batteries.Herein,a kind of carbon nanotube (CNT) supported single-site Fe-N-C catalyst was fabricated via pyrolyzing in-situ grown Fe-containing zeolitic imidazolate frameworks on CNTs.CNTs not only serve as the physical supports of the Fe-N-C active sites but also provide a conductive network to facilitate the fast electron and ion transfer.The as-synthesized catalysts exhibit a half-wave potential of 0.865 V for oxygen reduction reaction and a low overpotential of 0.442 V at 10 mA.cm-2 for oxygen evolution,which is 310 mV smaller than that of Fe-N-C without CNTs.The rechargeable Zn-air batteries fabricated with such hybdd catalysts display a high peak power density of 182 mW.cm-2 and an excellent cycling stability of over 1,000 h at 10 mA.cm-2,which outperforms commercial Pt-C and most of the reported catalysts.This facile strategy of combining single-site MetaI-N-C with CNTs network is effective for preparing highly active bifunctional electrocatalysts.
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