Synergetic effects of edge formation and sulfur doping on the catalytic activity of a graphene-based catalyst for the oxygen reduction reaction. Issue 37 (12th September 2016)

• Record Type: Journal Article
• Authors: Oh, SeKwon; Kim, JongHun; Kim, MinJoong; Nam, DoHwan; Park, JeongYoung; Cho, EunAe; Kwon, HyukSang
• Is Part Of: Journal of materials chemistry. Volume 4:Issue 37(2016)
• Page Start: 14400
• Page End: 14407
• Publication Date: 2016-09-12
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c6ta05020d
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : An edge activated S doped Fe-N-graphene (EA-SFeNG) was synthesized via a facile and effective ball milling and pyrolysis method for a highly active ORR catalyst. Abstract : An edge activated S doped Fe-N-graphene (EA-SFeNG) was successfully synthesized via facile ball milling followed by a pyrolysis process. The oxygen reduction reaction (ORR) performance of EA-SFeNG was dramatically improved by doping S and forming edge sites in Fe-N-graphene; the onset potential was shifted from 0.91 VRHE to 1.0 VRHE with the half-wave potential increased from 0.77 VRHE to 0.848 VRHE . The EA-SFeNG exhibited catalytic performances that are comparable to those of commercial 20 wt% Pt/C ( V onset : 1.05 V, V 1/2 : 0.865 V); however, its durability was better than that of the Pt catalyst in alkaline media. The excellent ORR activity can be attributed to the increase in defect density and SO x bonding in the EA-SFeNG. Furthermore, we experimentally demonstrate that the work function of the Fe-N-graphene is significantly reduced from 4.06 eV to 4.01 eV by the increase in edge density and doping S, thereby improving the ORR kinetics of EA-SFeNG.