利用爆轰纳米金刚石(ND)导热性极强的特点,将尺寸较小的反应物前驱体分布在ND表面后产生需要的金属盐再进行氮掺杂,成功制备出高效氧还原反应催化剂Fe-NND并应用于锌-空电池。结果表明,其ORR反应过程电子转移数为3.91,起始电位为0.903 6 V,电流密度高达5.225 mA/cm²,且经过6 000圈CV循环其半波电位仅下降26 mV。在锌-空电池上的峰值功率密度为91.81 mW/cm²,比容量高达847 mA·h/g。

Detonated nano diamond (ND) is a nano carbon material with stable physical and chemical properties formed by sp³ hybridization of carbon atoms.Taking advantage of the extremely strong thermal conductivity of ND,the reactant precursor with a smaller size is distributed on the surface of ND to produce the required metal salt,which is then doped to obtain Fe-NND,an oxygen reduction reaction catalyst,which is applied in zinc-air batteries.Experimental characterization test shows that the electron transfer number in the oxygen reduction reaction process is 3.91,the onset potential is 0.903 6 V,the current density is as high as 5.225 mA·cm^-2,and the half-wave potential drops only 26 mV after 6 000 CV cycles.In the zinc-air battery,its peak power density is 91.81 mW·cm^-2,and the specific capacity is as high as 847 mAh·g^-1.

徐子涵(1996-),男,硕士研究生,研究方向为电催化剂,18951610885@163.com。