Details

Autor(en) / Beteiligte

• Zhu, Yansong
• Lin, Yangming
• Zhang, Bingsen
• Rong, Junfeng
• Zong, Baoning
• Su, Dang Sheng

Titel

Nitrogen-Doped Annealed Nanodiamonds with Varied sp2/sp3 Ratio as Metal-Free Electrocatalyst for the Oxygen Reduction Reaction

Ist Teil von

• ChemCatChem, 2015-09, Vol.7 (18), p.2840-2845

Ort / Verlag

Weinheim: WILEY-VCH Verlag

Erscheinungsjahr

2015

Quelle

Wiley Online Library - AutoHoldings Journals

Beschreibungen/Notizen

• Nitrogen‐doped nanocarbon materials as metal‐free electrocatalysts for the oxygen reduction reaction (ORR) have attracted great attention, owing to their catalytic activity close to Pt/C in alkaline media. Annealed nanodiamonds (AND) possess a special structure, because we can finely control the carbon sp2/sp3 ratio. This provides a good opportunity to study the relationship between ORR performance (activity and stability) and the special structure of AND. We have used nitrogen‐doped annealed nanodiamonds (NAND) with varied carbon sp2/sp3 ratio as metal‐free electrocatalysts for ORR in alkaline media. NAND showed higher catalytic activity for ORR with higher content of sp2 carbon and larger amount of nitrogen species present as pyridinic groups. More importantly, NAND displayed stability superior to other nitrogen‐doped nanocarbon materials as a result of transformation of carbon from sp3 to sp2 during electrochemical cycling. Logical by name logical by nature: Nitrogen‐doped annealed nanodiamonds (NAND) showed high catalytic activity for the oxygen reduction reaction. More importantly, NAND displaying stability is extremely superior to other nitrogen‐doped nanocarbon materials due to transforming carbon from sp3 to sp2 during the electrochemical cycling test.