Electro-oxidation of ethanol

Lai SCS, Koper MTM. 2009. Electro-oxidation of ethanol and acetaldehyde on platinum single-crystal electrodes. Faraday Discuss 140 399-416. [Pg.203]

Considering as an example a DEFC, electro-oxidation of ethanol takes place at the anode (negative pole of the cell),... [Pg.344]

At the anode, the electro-oxidation of ethanol takes place as follows, leading, in the case of complete oxidation, to CO2 ... [Pg.22]

Table 1.2 Chemical yields in acetaldehyde, acetic acid and CO2 for the electro-oxidation of ethanol at Pt/C, Pt-Sn (90 10)/C and Pt-Sn-Ru (86 10 4)/C catalysts under DEFC operating conditions at 80 °C for 4 h.

Figure 1.11 Electro-oxidation of ethanol on Pt/C (full line) and different Pt-based (dashed and dotted lines) catalysts with 0.1 mgPtcrn" loading. 0.1 M HCIO4 + 1 M C2H5OH 5 mVs ...

A quantitative study of the electro-oxidation of ethanol on carbon-supported Pt, PtRu and PtsSn catalysts was made by Behm and co-woikers " nsing combined voltarmnetric and on-line Differential Electrochemical Mass Spectrometry measnrements (DEMS). [Pg.460]

Figure 35 shows a typical set of results obtained during the electro-oxidation of ethanol on PtRu/C catalyst with the voltam-mogram (Fig.35a) and three mass spectrometric cyclic voltammo-grams (MSCVs) (Figs. 35b, 35c and 35d). [Pg.461]

From the mass spectrometric data and Eqs. (27) and (28), it is possible to calculate the relative current due to the formation of caibon dioxide, acetaldehyde and finally acetic acid from the ethanol oxidation reaction. These partial currents are shown in Fig. 36 for Pt/C, PtRu/C and PtsSn/C catalysts. " This figure clearly presents the efficiency of the three different catalysts towards the formation of reaction products resulting from the electro-oxidation of ethanol. This quantitative analysis allows us to evaluate the total number of exchanged electrons during the oxidation reaction and the global current efficiency (Aq) and product yield (Wq) of the reaction calculated from the total charge involved for each partial current (Table 4). [Pg.462]

The adsorption and electro-oxidation of ethanol at Pt electrodes was studies by combining cychc voltammetry and longterm electrolysis with the on-line investigation of the reaction product and by-products. ... [Pg.466]

The analytical results concerning the electro-oxidation of ethanol in a Direct Ethanol Fuel Cell (DEFC) were obtained by online HPLC analysis coupled with the fuel cell test bench (Scheme 3). [Pg.471]

Tremihosi-Filho G, Gonzalez ER, Motheo AJ, Belgsir EM, Leger J-M, and Lamy C. Electro-oxidation of ethanol on gold Analysis of the reaction products and mechanism. J Electroanal Chem 1998 444 31-39. [Pg.1086]

The electro-oxidation of ethanol at platinum-based catalysts dispersed in an electron-conducting polymer was relatively sparsely investigated. It seems that... [Pg.937]

PtSn/C electrocatalysts with R Sn atomic ratios of 50 50 and 90 10 were prepared by alcohol-reduction process, using ethylene glycol as solvent and reducing agent, and by borohydride reduction. The electrocatalysts were characterized by EDX, XRD and cyclic voltammetry. The electro-oxidation of ethanol was studied by cyclic voltammetry using the thin porous coating technique. The electrocatalysts performance depends greatly on preparation procedures and R Sn atomic ratios. [Pg.617]

Tayal J, Rawat B, Basu S (2011) Bi-metallic and tri-metallic Pt-Sn/C, Pt-Ir/C, Pt-Ir-Sn/C catalysts for electro-oxidation of ethanol in direct ethanol fuel cell. Int J Hydrogen Energy 36 14884-14897... [Pg.77]

Sen Gupta S, Datta J (2005) An investigation into the electro-oxidation of ethanol and 2-propanol for application in direct alcohol fuel cells (DAECs). J Chem Sci 117(4) 337-344... [Pg.95]

Cantane DA, Ambrosio WF, Chatenet M, Lima FHB (2012) Electro-oxidation of ethanol on Pt/C, Rh/C, and Pt/Rh/C-based electrocatalysts investigated by on-line DBMS. J Electroanal Chem 681 56-65... [Pg.352]

Li G, Pickup PG (2006) The promoting effect of Pb on carbon supported Pt and Pl/Ru catalysts for electro-oxidation of ethanol. Electrochim Acta 52 1033-1037... [Pg.24]

Bozzini B, Gaudenzi GPD, Busson B, Humbert C, Six C, Gayral A, Tadjeddine A (2010) In situ spectroelectrochemical measurements during the electro-oxidation of ethanol on WC-supported Pt-black, based on sum-frequency generation spectroscopy. J Power Sources 195(13) 4119-4123... [Pg.42]

Kim JW, Park SM (2003) In situ XANES studies of electrodeposited nickel oxide films with metal additives for the electro-oxidation of ethanol. J Electrochem Soc 150(11) E560-E566... [Pg.125]

Maiyalagan T, Scott K (2010) Performance of carbon nanofiber supported Pd-Ni catalysts for electro-oxidation of ethanol in alkaline medium. J Power Sources 195 5246-5251... [Pg.155]

Zhu LD, Zhao TS, Xu JB, Liang ZX (2009) Preparation and characterization of carbon supported submonolayer palladium decorated gold nanoparticles for the electro-oxidation of ethanol in alkaline media. J Power Sources 187 80-84... [Pg.155]

In this mechanism the adsorbed acetyl plays a key role and its further oxidation is favored by the addition to platinum of metal atoms more easily oxidizable at low potentials, such as Ru, Sn, Mo, etc. Other electrocatalysts were considered for the electro-oxidation of ethanol, such as rhodium, iridium [18] or gold [19], leading to similar results in acid medium. The oxidation of ethanol on rhodium proceeds mainly through the formation of acetic acid and carbon monoxide, which is further oxidized to carbon dioxide when the rhodium surface begins to oxidize, at 0.5-0.7 V/RHB [18]. On gold in acid medium the oxidation reaction leads mainly to the formation of acetaldehyde [19]. [Pg.326]

Hitmi H, Belgsir EM, Leger J-M, Lamy C, Lezna RO (1994) A kinetic analysis of the electro-oxidation of ethanol at a platinum electrode in acid medium. Electrochim Acta 39 407 15... [Pg.329]

Spinace EV, Linardi M, Oliveira Neto A (2005) Co-catalytic effect of nickel in the electro-oxidation of ethanol on binary Pt-Sn electrocatalysts. Electrochem Commun 7 365-369... [Pg.410]

Oliveira Neto A, Giz MJ, Perez J, Ticianelli EA, Gonzalez ER. The electro-oxidation of ethanol on Pt-Ru and Pt-Mo particles supported on high-surface-area carbon. J Electrochem Soc 2002 149 A272-9. [Pg.84]

Spinace EV, Neto AO, Linardi M. Electro-oxidation of ethanol on PtRu/C electrocatalysts prepared from (r -C2H4)(Cl)Pt(pCl)2Ru(Cl)(Ti, Ti -CioHi6). J Power Sources 2003 124 426. [Pg.480]

Zhang DY, Ma ZF, Wang G, Konstantinov K, Yuan X, Liu HK. Electro-oxidation of ethanol on Pt-W03/C electrocatalyst. Electrochem Sohd-State Lett 2006 9 A423-6. [Pg.607]

The production of nanostructured carbon materials by hydrothermal processes from natural precursors is one of the most attractive subjects in material science today. Carbon materials prepared from hydrothermal process are currently being used in various fields of research including environmental, electrical, chemical, and biomedical fields. In environmental application, carbon is mainly used as a sorbent material for the removal of heavy metal ions (CrO/, Pb +, and Cd +) from water and wastewater [116,117]. Carbon nanocoils prepared from saccharides (sucrose, glucose, and starch) with a support of Pt/Ru nanoparticles exhibit a high catalytic activity for the electro-oxidation of methanol in an acid medium [150]. Similarly, electro-oxidation of ethanol and methanol was carried out with electro catalysts, such as Pd/CHC (coin-like hollow carbon), Pt/ HCS (hard carbon spherules), and Pt/Pd/CMS (carbon microspheres) in acidic and alkaline media... [Pg.410]

On a pure Pf/C catalyst, Rousseau et showed that the electro-oxidation of ethanol at the anode of a DEFC working at 80°C mainly led to the formation of acetaldehyde, acetic acid and carbon dioxide, with chemical yields of 47.5%, 32.5% and 20.0%, respectively. By comparing the mass yield and the faradic yields, they concluded that no other products were formed in a significant amount. This result confirms that Pt is able to break the C-C bond to some extent In situ infrared measurements on ethanol adsorption and electro-oxidation at platinum electrodes have clearly shown that the adsorbed CO species are formed from 0.3 V vs RHE at the platinum surface moreover Iwasita and Pastor found some traces of CH4 at potentials lower than 0.4 V vs RHE. Previous studies showed that the initial steps of ethanol adsorption and oxidation on Pt can follow two different modes ... [Pg.237]

Hitmi, H., Belgsir, E., Leger, J.-M., et al. (1994). A Kinetic Analysis of the Electro-oxidation of Ethanol at a Platinum Electrode in Acid Medium, Electrochim. Acta, 39, pp. 407 15. [Pg.249]

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