一种多孔FeOx,N共掺杂炭材料的制备及其在酸和碱电解液中的优异氧还原反应催化性能

A porous FeOx, N co-doped carbon material as an efficient catalyst toward oxygen reduction reactions in both alkaline and acidic electrolytes

  • 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碳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,并且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),实验证明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 the precious metal ORR (oxygen reduction reaction) electrocatalysts, many transition metals and N-doped carbon composites have been proposed in last decade and acquire a rapid development as the promising non-precious metal catalysts. Herein, Ketjenblack carbon was adopted as the carbon precursor and fully mixed with the polymeric ionic liquid (PIL) of HvimNO3 and Fe(NO3)3. This mixture was thermally calcined at 900 °C to produce a porous Fe, N co-doped carbon material denoted as the FeOx-N/C. Due to the fact that the PIL of HvimNO3 can strongly combine and disperse Fe3+ ions, and NO3 will be thermally pyrolyzed to form the porous structure, the FeOx-N/C catalyst displays high electrocatalytic activity toward ORR in both 0.1 mol L−1 KOH and 0.5 mol L−1 H2SO4 electrolytes. The FeOx-N/C is used as the catalyst to assemble a zinc-air battery, which exhibits a peak power density of 185 mW·cm−2. The superior electrocatalytic activity, wide pH range, and facile preparation approach jointly make the FeOx-N/C a promising electrocatalyst for the fuel cells and metal-air batteries in the future.

     

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