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Selective nitrogen doping in graphene for oxygen reduction reactions.
Satoshi Yasuda1, Li Yu, Jeheon Kim
1Department of Chemistry, Faculty of Science, Hokkaido University, Sapporo, 060-0810, Japan. satoshi-yasuda@sci.hokudai.ac.jp kei@sci.hokudai.ac.jp.
Chemical Communications (Cambridge, England)
|September 12, 2013
Summary
Nitrogen-doped graphene, synthesized via surface polymerization, exhibits distinct oxygen reduction pathways. Pyridinic nitrogen species facilitate a four-electron pathway, while quaternary nitrogen species enable a two-electron pathway in alkaline solutions.
Area of Science:
- Materials Science
- Electrochemistry
- Catalysis
Background:
- Nitrogen-doped graphene (NG) is a promising catalyst for oxygen reduction reactions (ORR).
- Understanding the role of different nitrogen species in NG is crucial for optimizing ORR performance.
- Selective synthesis of NG with controlled nitrogen configurations remains a challenge.
Purpose of the Study:
- To selectively synthesize nitrogen-doped graphene materials with abundant pyridinic and quaternary nitrogen species.
- To investigate the distinct oxygen reduction pathways mediated by pyridinic and quaternary nitrogen species in NG.
- To elucidate the catalytic mechanisms of NG in alkali-based electrolytes.
Main Methods:
- Thermal surface polymerization of nitrogen-containing aromatic molecules to synthesize NG.
- Electrochemical characterization, including cyclic voltammetry and rotating disk electrode measurements, to study ORR.
- Analysis of reaction pathways using techniques to differentiate between two-electron and four-electron reduction.
Main Results:
- Successfully synthesized nitrogen-doped graphene materials with controlled pyridinic and quaternary nitrogen content.
- Demonstrated that pyridinic nitrogen species in NG catalyze the ORR via a four-electron pathway.
- Showed that quaternary nitrogen species in NG facilitate the ORR via a two-electron pathway in alkali-based solutions.
Conclusions:
- The type of nitrogen species in graphene dictates the oxygen reduction reaction pathway.
- Pyridinic and quaternary nitrogen species in NG exhibit distinct catalytic activities and mechanisms for ORR.
- This selective synthesis and mechanistic understanding pave the way for designing advanced graphene-based electrocatalysts.
