Choi Sang-Il, Lee Su-Un, Choi Ran, Park Joon T, Han Sang Woo
Department of Chemistry and KI for the NanoCentury, Korean Advanced Institute of Science and Technology (KAIST), Daejeon 305-701 (Republic of Korea).
Center for Nanomaterials and Chemical Reactions, Institute for Basic Science, Daejeon 305-701 (Republic of Korea).
Chempluschem. 2013 Oct;78(10):1252-1257. doi: 10.1002/cplu.201300191. Epub 2013 Jul 3.
Recently, nitrogen-doped carbon materials have proved to be effective catalytic platforms for the oxygen reduction reaction (ORR). Despite the recent synthetic advances for the preparation of nitrogen-incorporated carbon materials, the low-temperature and water-based synthesis of nitrogen-doped carbon materials has rarely been explored due to the difficulties in nitrogen-doping under such mild conditions. Here, nitrogen-doped Pt/C (Pt/NC) catalysts are prepared using a facile, low-temperature, aqueous-phase method. Hydrazine treatment of a Pt/C catalyst successfully yields Pt/NC with controlled nitrogen content. The as-prepared Pt/NC catalysts exhibit enhanced electrocatalytic activity and stability toward ORR in comparison to nitrogen-free Pt/C, and their ORR activities are highly dependent on the level of nitrogen-doping. The Pt/NC catalyst containing 2.0 at % nitrogen results in the largest improvement of ORR activity.
最近，氮掺杂碳材料已被证明是用于氧还原反应（ORR）的有效催化平台。尽管最近在制备氮掺杂碳材料方面取得了合成进展，但由于在如此温和的条件下进行氮掺杂存在困难，因此很少有人探索氮掺杂碳材料的低温水相合成方法。在此，采用简便的低温水相法制备了氮掺杂的Pt/C（Pt/NC）催化剂。对Pt/C催化剂进行肼处理成功得到了氮含量可控的Pt/NC。与不含氮的Pt/C相比，所制备的Pt/NC催化剂对ORR表现出增强的电催化活性和稳定性，并且它们的ORR活性高度依赖于氮掺杂水平。含2.0 at %氮的Pt/NC催化剂导致ORR活性有最大程度的提高。
