Sulfur-doped graphene as a potential alternative metal-free electrocatalyst and Pt-catalyst supporting material for oxygen reduction reaction

Autor:	Dong Ha Kim, Seokhyun Yoon, Yeojin Kim, Mi Sun Song, Sung Jin Kim, Ji Eun Park, Yu Jin Jang
Rok vydání:	2014
Předmět:	Materials science Graphene Inorganic chemistry Doping Limiting current General Physics and Astronomy Thermal treatment Carbon black Electrocatalyst Platinum nanoparticles Catalysis law.invention law Physical and Theoretical Chemistry
Zdroj:	Phys. Chem. Chem. Phys.. 16:103-109
ISSN:	1463-9084 1463-9076
DOI:	10.1039/c3cp54311k
Popis:	In this study, sulfur-doped graphene (S-graphene) was synthesized by thermal treatment of exfoliated graphene under CS2 gas flow. Its electrocatalytic activity as a metal-free catalyst was evaluated and compared with other doped-graphenes and commercial platinum nanoparticles loaded on carbon black (Pt/C) catalysts for oxygen reduction reaction (ORR) in fuel cell cathodes. The resultant S-graphene was shown to act as a viable catalyst for ORR and its limiting current density and durability were improved compared to those of the commercial Pt/C catalyst. The current density at -1.0 V for the commercial Pt/C catalyst, pristine graphene, nitrogen-doped graphene (N-graphene) and S-graphene was 4.7, 0.15, 6.26 and 6.99 mA cm(-2), respectively. The durability of S-graphene (70.3%) was much better compared to commercial Pt/C (37.2%) and N-graphene (67.9%). When S-graphene was used as a supporting material for Pt nanoparticles, its catalytic performance was significantly higher than other Pt catalysts supported on different doped graphenes. Here, we demonstrate that S-graphene can be used as a novel graphene-based efficient metal-free ORR catalyst in fuel cells.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::054803a469d2fb81f9186ccf4bddaa62 https://doi.org/10.1039/c3cp54311k Zobrazit plný text záznamu