Enriched graphitic N in nitrogen-doped graphene as a superior metal-free electrocatalyst for the oxygen reduction reaction

Content Provider	Semantic Scholar
Author	Lu, Xiangyu Wang, Dan Ge, Liping Xiao, Lihui Zhang, Hai-Yan Liu, Lilai Zhang, Jinqiu An, Maozhong Yang, Peixia
Copyright Year	2018
Abstract	Nitrogen-doped graphene (N-G) is considered as a promising catalyst for the oxygen reduction reaction (ORR). However, the contributions of pyridinic N, pyrrolic N and graphitic N in N-G for the ORR catalytic activity are controversial. In this work, the contents of pyridinic N, pyrrolic N and graphitic N in N-G were transformed by annealing at different temperatures. It is found that the total N content in N-G is not the critical factor to determine the ORR activity. An increase in the annealing temperature can enhance the content of graphitic N in N-G, causing an improved catalytic ORR activity, which confirms that graphitic N is the active component. Moreover, the enriched graphitic N in the N-G-1000 catalyst shows a half-wave potential (E1/2) of 0.862 V, 29 mV higher than that of the commercial Pt/C catalyst (0.833 V), which is one of the best reported for ORR metal-free catalysts.
Starting Page	19665
Ending Page	19670
Page Count	6
File Format	PDF HTM / HTML
DOI	10.1039/C8NJ04857F
Alternate Webpage(s)	http://www.rsc.org/suppdata/c8/nj/c8nj04857f/c8nj04857f1.pdf
Alternate Webpage(s)	https://doi.org/10.1039/C8NJ04857F
Volume Number	42
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article