氮掺杂稻壳基多孔炭的制备及其氧气还原反应的电催化性能

A N-doped rice husk-based porous carbon as an electrocatalyst for the oxygen reduction reaction

  • 摘要: 本文发展了一种氮掺杂稻壳基多孔炭(N-RHPC)的制备方法,即将RHPC在氨气氛围下进行高温处理,操作简单,有利于大规模制备。结果表明,N-RHPC的介孔体积、石墨化程度明显提高,XPS N 1s谱证实了N原子在RHPC结构上的有效掺杂。N-RHPC作为ORR电催化剂具有与商用Pt/C接近的电催化活性,并具有较好的稳定性以及耐甲醇毒性,这主要是由于氨气氛围下对RHPC的高温处理使N原子进入RHPC中而引入了大量的催化位点所致。N-RHPC制备方法简单,性价比高,作为电催化剂具有很好的应用前景。

     

    Abstract: A N-doped rice husk-based porous carbon (N-RHPC) was cost-effectively prepared by simply treating RHPC at high temperature in an ammonia atmosphere. Results show that the mesopore volume and degree of graphitization of N-RHPC are significantly increased by the treatment. N atoms are doped in the RHPC structure in the form of pyridinic N (398.5 ±0.1 eV), pyridonic N (399.3 ±0.1 eV), and graphitic N groups (401.1 ±0.1 eV) and N-oxide (401.8 ±0.1 eV). Compared with a commercial Pt/C catalyst, the N-RHPC as an oxygen reduction electrocatalyst has a similar electrocatalytic activity, and better stability and methanol toxicity resistance. This excellent performance is ascribed to the increased number of catalytic sites afforded by the nitrogen species, the improved degree of graphitization that increases electron transfer, and the unique pore structure with macropores, mesopores and micropores for fast ion transport.

     

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