叶片状Zn-N共掺杂的碳用于高效氧还原反应

Zn-N Codoped Carbon with Leaf-shaped for Highly Efficient Oxygen Reduction Reaction

开发具有氧还原性能的碳基催化剂,以替代昂贵且不稳定的铂基催化剂,对于它们在能量转换和存储中的最佳利用至关重要。本论文叶片状Zn,N共掺杂的碳基(Zn-N codoped C)材料通过在NH3条件下,热处理叶片状沸石咪唑酯框架(ZIF-L)获得,结果表明,Zn-N共掺杂碳具有优越的氧还原性能,起始过电压为0.95 V,半波电位0.80 V,极限电流密度5.57 mA·cm^-2,在碱性条件下,性能类似商业Pt/C催化剂性能。

The development of carbon-based oxygen reduction reaction(ORR) catalysts to substitute the expensive and unstable platinum-based ORR catalysts is of great importance for their optimal utilization in energy conversion and storage. Here, Zn, N codoped carbon with leaf-shaped was prepared using leaf-shaped Zeolitic Imidazolate Framework(ZIF-L) as precursor via thermal annealing under NH3. As a result, the as-synthesized Zn-N-C presents outstanding ORR onset-potential(0.95 V), half-wave potential(0.80 V), and diffusion limiting current density(5.57 mA·cm^-2), that is similar to that at commercial Pt/C catalyst in alkaline electrolyte.