Improved oxygen reduction activity of porous carbon materials by self-doping nitrogen derived from PVP with urea as a promoter
Improved oxygen reduction activity of porous carbon materials by self-doping nitrogen derived from PVP with urea as a promoter
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以尿素为促进剂自掺杂 PVP 氮提高多孔碳材料的氧还原活性
DOI：
10.1016/j.electacta.2015.01.172
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发表时间：
2015-09
影响因子：
6.6
通讯作者：
Shichun Mu
中科院分区：
文献类型：
--
作者：
Jian Zhang;Qidong Li;Hui Wu;Ibrahim Saana Amiinua;Chenyu Zhang;Kun Cheng;Huang Zhou;Shichun Mu
以聚乙烯吡咯烷酮(PVP)为前驱体，尿素为助剂，采用一种简单而有效的方法制备了一种新型的掺氮碳催化剂。物化测试结果表明，加入尿素后的样品不仅具有高比表面积的多孔结构，而且比未加入尿素的样品具有更多的活性氮含量和边缘缺陷。电化学表征表明，该催化剂在碱性介质中具有良好的氧还原反应(ORR)活性和近4电子路径选择性。值得注意的是，该催化剂的起始电势与商品铂/碳催化剂相当，其半波电势仅比铂/碳催化剂低30 mV。此外，与铂/碳催化剂相比，我们的催化剂表现出令人印象深刻的耐用性和良好的抗甲醇越界和抗CO中毒能力。
A novel nitrogen (N)-doped carbon catalyst has been prepared using a simple but effective method by pyrolyzing polyvinylpyrrolidone (PVP) as the precursor and urea as a promoter. The physicochemical measurements results show that the sample upon adding urea not only has a porous structure with high surface area, but possesses more active N content and edge defects than the sample without adding urea. The electrochemical characterizations show that the catalyst owns a good oxygen reduction reaction (ORR) activity and a nearly 4-electron pathway selectivity in alkaline media. Notably, the onset potential of the catalyst is equal to the commercial Pt/C catalyst, and its half-wave potential is only 30 mV lower than that of Pt/C. Moreover, our catalyst exhibits impressive durability and excellent resistance to methanol crossover and CO poisoning in comparison with Pt/C catalyst.
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