Ethanol oxidation activity and structure of carbon-supported Pt-modified PdSn-SnO2 influenced by different stabilizers

Abstract

. Ethanol oxidation activity and structure of carbon-supported Pt- (HMTA). TEM analysis showed that PdSn-SnO2 /C catalyst made using the HMTA stabilizer produced the smallest particle size. XRD analysis detected the presence of PdSn alloy and the SnO2 phase in all three PdSn-SnO2 /C samples, and showed that PdSn-SnO2 (HMTA) had the smallest lattice parameter. After PdSn-SnO2 samples were modified by Pt, the particle size distribution and average size of nanoparticles of Pt-PdSn-SnO2 did not obviously change, and the fcc structure of PdSn in all three samples was retained. XPS measurement showed a higher upshift of Pt 4f binding energy occurred for Pt/PdSn-SnO2 /C (HMTA) compared to those of Pt/PdSn-SnO2 /C (EDTA) and Pt/PdSn-SnO2 /C (Nacitrate). Pt/PdSn-SnO2 /C (HMTA) was also found to have the highest CO and ethanol oxidation activity among the three catalysts. IntroductionThe direct ethanol fuel cell (DEFC) affords an attractive alternative to the direct methanol fuel cell (DMFC) because: (1) ethanol is less toxic than methanol and is easier to store and transport due to its relatively higher boiling point; (2) ethanol can be produced in large quantities by chemical or biological processes; and (3) ethanol has higher energy density than methanol [1]. However, implementation of DEFC technology is hindered by the sluggish rate of the ethanol oxidation reaction (EOR) on the anode [2], and thus requires the development of effective anodic catalysts to increase EOR activity.

Oxidation of ammonia using PtRh/C electrocatalysts: Fuel cell and electrochemical evaluation

“…311) and (220) planes [26], accordingly to JCPDF # 04 802 and JCPDF # 88 2334, respectively. A broad peak at 2θ about 25º was also observed and assigned to the (022) reflection of the hexagonal structure of Vulcan XC 72 carbon [27,28].…”

Screening of filamentous fungi for antimicrobial silver nanoparticles synthesis

“…The AgNP synthesized by the strain IPT1013, presented the most deformed pattern by low structured carbon support (large peak ≈25°) (Wang et al 2013 ; Modibedi et al 2011 ) due to smaller crystallite size. For IPT853 and IPT1011 AgNP, it was possible to observe two carbon phases structured at 26° and 46° (JCPDF # 18-311), silver oxides (AgO; JCPDF # 76-1489) at 32° and 55°, and Ag 2 O 2 (JCPDF # 51-945) at 57°.…”

PdAu/C Electrocatalysts as Anodes for Direct Formate Fuel Cell

“…Results and Discussion Figure 1 shows the XRD patterns of the PdAu/C prepared with different atomic ratios, Pd/C and Au/C catalysts prepared by the borohydride reduction process. In all XRD patterns, a broad peak at 2θ about 25°was observed and assigned to the (022) reflection of the hexagonal structure of Vulcan XC72 carbon [18,19]. The face-centered cubic systems of Pd can also be observed by the peaks at 2θ=40°, 46°, 68°, and 82°, which respectively corresponds to (111), (200), (220), and (311) reflections of Pd face-centered-cubic (fcc) according to JCPDF# 88-2335, as already observed before [18][19][20][21][22].…”

“…In all XRD patterns, a broad peak at 2θ about 25°was observed and assigned to the (022) reflection of the hexagonal structure of Vulcan XC72 carbon [18,19]. The face-centered cubic systems of Pd can also be observed by the peaks at 2θ=40°, 46°, 68°, and 82°, which respectively corresponds to (111), (200), (220), and (311) reflections of Pd face-centered-cubic (fcc) according to JCPDF# 88-2335, as already observed before [18][19][20][21][22]. Au/C electrocatalysts show diffraction peaks at about 38°, 44°, 65°, 78°, and 82°, attributed to the (111), (200), (220), (311), and (222) planes, characteristics of the fcc structure of Au [22][23][24].…”