Ultrastable Pt nanoparticles supported on sulfur-containing ordered mesoporous carbon via strong metal-support interaction

Structure control of silica-supported mono and bimetallic Au–Pt catalysts via mercapto capping synthesis

“…In the S 2p region, not shown for simplicity, a peak at 161.8 eV negatively shifted with respect to a mercaptopropyl groups bounded to silica was present [27]. The positive shift of Pt 4f with respect to metallic Pt and the negative shift of S 2p with respect to the mercapto group are due to a charge transfer from Pt nanoparticles to sulfur, indicative of a Pt-S chemical interaction [28]. Upon calcination, the sulfur peak disappears because of the decomposition and removal of the mercaptopropyl groups.…”

Nanostructured mesoporous carbons: Tuning texture and surface chemistry

“…It was observed that an increase of the carbonization temperature produced a gradual enlargement of the mesopores as well as a decrease of the sulfone bridge fraction. Lee et al[158] replicated a MSU-H mesoporous silica with 2-D hexagonal structure by subsequent infiltrations with p-toluene sulfonic acid and heating up to 160 ºC for 6 hours. Carbonization was conducted at 900 ºC for 3 h and the silica template was removed with HF.…”

Development of stable electrochemical catalysts using ordered mesoporous carbon/silicon carbide nanocomposites

“…1,10-phenanthroline and para-toluene sulfonic acid was simultaneously infiltrated within the mesopores of the silica template by an incipient wetness impregnation method [15], and the carbon precursor-silica template composites i n t e r n a t i o n a l j o u r n a l o f h y d r o g e n e n e r g y x x x ( 2 0 1 5 ) 1 e1 0 were transferred to alumina crucibles. The composites were heated in N 2 flows at 900, 1350, 1400, 1450 or 1600 C for 2 h. The resulting materials were then washed twice with an aqueous hydrofluoric acid solution in order to remove the silica template completely.…”

“…We have also developed ordered mesoporous carbon (OMC) materials as novel supports for electrochemical catalysts, which exhibit large surface areas, highly interconnected mesopores and graphitic frameworks [10e16]. Recently, a Pt catalyst supported on a sulfur-containing OMC (Pt/S-OMC) exhibited a higher electrochemical stability as well as a catalytic activity for ORR under acidic conditions, due to the strong metalesupport interaction between the Pt nanoparticles and sulfur [15]. However, the mesostructure of Pt/S-OMC appeared to collapse moderately after the 2000th voltage-cycling test.…”