title: Sulfur-Doped Porphyrinic Carbon Nanostructures Synthesized with Amorphous MoS2for the Oxygen Reduction Reaction in an Acidic Medium.
abstract: To develop doped carbon nanostructures as non-precious metal cathode catalysts, nanocomposites were synthesized by using SBA-15 and 5,10,15,20-tetrakis(4-methoxyphenyl)porphyrin-iron(III) chloride with different ratios of amorphous MoS2precursor. From various analyses, it was found that, during pyrolysis at 900 °C under an N2atmosphere, the amorphous MoS2precursor decomposed into Mo and S, facilitating the formation of graphene sheet-like carbon with MoC and doping of sulfur in the carbon. In the nanocomposite formed from 10 wt % MoS2precursor (denoted as Mo/S/PC-10), most of the MoS2was decomposed, thus forming S-doped carbon, which was grown on the MoC phase without crystalline MoS2. Furthermore, Mo/S/PC-10 exhibited better performance in the oxygen reduction reaction (specific activity of 1.23 mA cm-2at 0.9 V and half-wave potential of 0.864 V) than a commercial Pt catalyst, owing to a heteroatom-doped carbon nanostructure with a fairly high specific surface area. In the polarization curve of the unit-cell performance measured at 80 °C under ambient pressure, Mo/S/PC-10 as a cathode catalyst exhibited an optimal power density of 314 mW cm-2and a current density of 280 mA cm-2at 0.6 V.
authors.affiliation: Department of Chemical Engineering, Soongsil University, 369 Sangdo-ro, Dongjak-gu, Seoul, 06978, Republic of Korea.
authors.forename: Hyun-Suk
authors.initials: HS
authors.lastname: Park
authors.affiliation: Department of Chemical Engineering, Soongsil University, 369 Sangdo-ro, Dongjak-gu, Seoul, 06978, Republic of Korea.
authors.forename: Sang-Beom
authors.initials: SB
authors.lastname: Han
authors.affiliation: Department of Chemical Engineering, Soongsil University, 369 Sangdo-ro, Dongjak-gu, Seoul, 06978, Republic of Korea.
authors.forename: Da-Hee
authors.initials: DH
authors.lastname: Kwak
authors.affiliation: Department of Chemical Engineering, Soongsil University, 369 Sangdo-ro, Dongjak-gu, Seoul, 06978, Republic of Korea.
authors.forename: Gyu-Ho
authors.initials: GH
authors.lastname: Lee
authors.affiliation: Department of Chemical Engineering, Soongsil University, 369 Sangdo-ro, Dongjak-gu, Seoul, 06978, Republic of Korea.
authors.forename: In-Ae
authors.initials: IA
authors.lastname: Choi
authors.affiliation: Department of Chemical Engineering, Soongsil University, 369 Sangdo-ro, Dongjak-gu, Seoul, 06978, Republic of Korea.
authors.forename: Do-Hyoung
authors.initials: DH
authors.lastname: Kim
authors.affiliation: Department of Chemical Engineering, Soongsil University, 369 Sangdo-ro, Dongjak-gu, Seoul, 06978, Republic of Korea.
authors.forename: Kyeng-Bae
authors.initials: KB
authors.lastname: Ma
authors.affiliation: Department of Chemical Engineering, Soongsil University, 369 Sangdo-ro, Dongjak-gu, Seoul, 06978, Republic of Korea.
authors.forename: Min-Cheol
authors.initials: MC
authors.lastname: Kim
authors.affiliation: Department of Chemical Engineering, Soongsil University, 369 Sangdo-ro, Dongjak-gu, Seoul, 06978, Republic of Korea.
authors.forename: Hye-Jin
authors.initials: HJ
authors.lastname: Kwon
authors.affiliation: Department of Chemical Engineering, Soongsil University, 369 Sangdo-ro, Dongjak-gu, Seoul, 06978, Republic of Korea.
authors.forename: Kyung-Won
authors.initials: KW
authors.lastname: Park
mesh_terms: D002244:Carbon / Q000737:chemistry*; D004220:Disulfides / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D046529:Microscopy, Electron, Transmission; D008982:Molybdenum / Q000737:chemistry*; D049329:Nanostructures / Q000737:chemistry*; D010084:Oxidation-Reduction; D010100:Oxygen / Q000737:chemistry*; D011166:Porphyrins / Q000737:chemistry*; D013455:Sulfur / Q000737:chemistry*; D014961:X-Ray Diffraction
chemical_list: D004220:Disulfides; D011166:Porphyrins; D013455:Sulfur; D002244:Carbon; D008982:Molybdenum; D010100:Oxygen; C082964:molybdenum disulfide
keywords: carbonaceous materials; doping; electrocatalysis; fuel cells; nanostructures