Amorphous alloys, ethanol oxidation

PdsyRuis exhibits high electroactivity towards ethanol oxidation 5 % Ce02 efficiently dispersed the Pd-Ni alloy NPs on the C support as well as manipulate the surface composition High 7f//b ratio with 5 % Ce02 Alloy contains some amorphous NiO species on its surface, which are able... 

Although ethanol electro-oxidation has been studied in the past [135,136], only recently has this subject gained the attention of researchers, particularly of a specific research group in Spain that has been conducting studies on ethanol electro-oxidation on NiNb-based amorphous alloys [137]. 

FIGURE 15.9 General scheme for ethanol electro-oxidation on amorphous alloys (reproduced from Ref. [139]). 

Wang et al. [140] have studied amorphous CoSn/C alloys decorated with Pt as highly efficient electrocatalysts for ethanol oxidation. The catalysts were prepared using a two-stage chemical synthesis (sol-gel preparation and Steady-state replacement method). XRD results evidenced that the CoSn-base was in the amorphous state, but the characteristic peaks of the Pt fee crystalline structure appeared after Pt deposition. The TEM images confirmed that Pt was deposited onto CoSn/C. The electrochemical measurements showed that the mass activity of the Pt-CoSn/C catalyst was 454.6mA mgp, , which was about 1.71 and 1.74 times those of Pt/C and PtSn/C. The authors attributed this behavior to the possible modification in the Pt electronic structure elicited by the amorphous CoSn alloy. Materials based on amorphous alloys can open new perspectives regarding ethanol electro-oxidation. 

Preparation of amorphous products The preparation of metals (Fe, Co, Ni, Pd, Au), alloys (Au-Pd, Fe-Co, etc.), oxides, chalcogenides, etc. has been reported. The synthesis of sulphides, for instance, has been obtained in solutions (in water, ethanol, etc.) of the metal chloride or acetate using thioacetamide or thiourea as sulphur precursor. 

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