一种多孔FeOx,N共掺杂炭材料的制备及其氧还原反应性能

A carbon material doped with both porous FeOx and N as an efficient catalyst for oxygen reduction reactions

  • 摘要: 为替代氧还原反应(ORR)的贵金属催化剂,近年来许多过渡金属和氮掺杂炭复合材料得到了快速的发展,并成为一种极具发展前景的非贵金属催化剂。本文以科琴黑(KB)为前驱体,通过与HvimNO3聚合离子液体(PIL)和Fe(NO3)3充分混合,然后在900 °C下煅烧制得一种多孔FeOx, N共掺杂的炭材料(记为FeOx-N/C)。由于HvimNO3能与Fe3+离子紧密结合,且NO3会在高温下热解造孔,所以FeOx-N/C催化剂在碱性(0.1 mol L−1 KOH)和酸性(0.5 mol L−1 H2SO4)电解质中表现出了较高的ORR电催化活性。随后,FeOx-N/C作为阴极催化剂成功组装了一个锌空气电池(ZAB),其峰值功率密度高达185 mW·cm−2。优异的电催化活性、较宽的pH值适用范围和简便的制备方法使得FeOx-N/C成为未来燃料电池和金属-空气电池的理想电催化材料。

     

    Abstract: To replace precious metal oxygen reduction reaction (ORR) electrocatalysts, many transition metals and N-doped carbon composites have been proposed in the last decade resulting in their rapid development as promising non-precious metal catalysts. We used Ketjenblack carbon as the precursor and mixed it with a polymeric ionic liquid (PIL) of HvimNO3 and Fe(NO3)3, which was thermally calcined at 900 °C to produce a porous FeOx, N co-doped carbon material denoted FeOx-N/C. Because the PIL of HvimNO3 strongly combines with and disperses Fe3+ ions, and NO3 is thermally pyrolyzed to form the porous structure, the FeOx-N/C catalyst has a high electrocatalytic activity for the ORR in both 0.1 mol L1 KOH and 0.5 mol L1 H2SO4 electrolytes. It was used as the catalyst to assemble a zinc-air battery, which had a peak power density of 185 mW·cm2. Its superior electrocatalytic activity, wide pH range, and easy preparation make FeOx-N/C a promising electrocatalyst for fuel cells and metal-air batteries.

     

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