Metal-Free Nitrogen-Doped Carbon Foam Electrocatalysts for the Oxygen Reduction Reaction in Acid Solution
Metal-Free Nitrogen-Doped Carbon Foam Electrocatalysts for the Oxygen Reduction Reaction in Acid Solution
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DOI：
10.1149/2.0631609jes
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发表时间：
2016
影响因子：
3.9
通讯作者：
Jianfeng Liu;S. Yu;T. Daio;M. Ismail;K. Sasaki;S. Lyth
中科院分区：
文献类型：
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作者：
Jianfeng Liu;S. Yu;T. Daio;M. Ismail;K. Sasaki;S. Lyth
利用无金属、氮掺杂的碳泡沫作为模型非贵金属电催化剂系统，以研究在没有铁污染的情况下氮在氧还原反应（ORR）中的作用。这种石墨烯样泡沫在酸中显示出相对高的ORR活性，尽管被证明不含过渡金属杂质。起始电位为0.85 VRHE，质量活度在0.6 VRHE时为2.8 A/g，电流密度为−4.0 mA/cm 2。最大的电子转移数计算为3.6，揭示了4-电子途径是可能的氮掺杂的碳，即使在过渡金属配位的情况下。优异的电化学活性归因于大的表面积（700 m2/g）、石墨化后改善的导电性和相对高比例的叔（类石墨）氮。
Metal-free, nitrogen-doped carbon foam is utilized as a model non-precious electrocatalyst system to investigate the role of nitrogen in the oxygen reduction reaction (ORR) in the absence of iron contamination. This graphene-like foam displays relatively high activity for the ORR in acid, despite being proven free from transition-metal impurities. The onset potential is 0.85 VRHE, the mass activity is 2.8 A/g at 0.6 VRHE, and the current density is −4.0 mA/cm2. The maximum electron transfer number is calculated to be 3.6, revealing that a 4-electron pathway is possible in nitrogen-doped carbon, even in the absence of transition-metal coordination sites. The excellent electrochemical activity is attributed to the large surface area (700 m2/g), improved conductivity after graphitization, and the relatively high proportion of tertiary (graphite-like) nitrogen.