Preparation and performance characterization of the Fe–Ni/ScSZ cermet anode for oxidation of ethanol fuel in SOFCs

Huang, Bo; Wang, S.R.; Liu, R.Z.; Wen, Tian

doi:10.1016/j.jpowsour.2007.02.075

Cited by 81 publications

(58 citation statements)

References 23 publications

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“…At 860°C (Figure 15), the total resistances for both fuels are similar although the polarization resistance remains larger for the steam/ethanol mixture. The latter is however compensated by a reduction of the ohmic resistance, which could originate from an improvement of the contact resistance due to carbon deposition, as suggested by references [11] and [4]. The formation of coke at higher temperatures is also suggested by the significant amount of ethene (7% of the dry gas composition) observed at 780°C in the catalytic test (cf.…”

Section: Comparison Of Performance With Syngas and Ethanol Mixturementioning

confidence: 86%

“…There are several studies dedicated to the performance of SOFC fuelled with a mixture of water and ethanol [2,[11][12][13][14][15][16][17][18][19]. The first results were obtained with standard anode Nicermets, either as electrolyte supported cells [14] or as planar [12] and tubular [2] anode supported cells, all of them with small active areas (≤ 1 cm 2 ).…”

Section: Introductionmentioning

confidence: 99%

“…Stability was demonstrated over 60h at 750°C and 60 mAcm -2 . The same author also investigated the use of Fe-Ni/ScSZ cermets prepared by impregnation of a porous SCSZ layer [11]. Only the Ni-free composition showed no C-deposit after 48h at 700°C with EtOH (EtOH:H2O=2:1 by vol.).…”

Section: Introductionmentioning

confidence: 99%

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Ethanol internal steam reforming in intermediate temperature solid oxide fuel cell

Diethelm¹,

herle²

2011

Journal of Power Sources

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This study investigates the performance of a standard Ni-YSZ anode supported cell under ethanol steam reforming operating conditions. Therefore, the fuel cell was directly operated with a steam/ethanol mixture (3 to 1 molar). Other gas mixtures were also used for comparison to check the conversion of ethanol and of reformate gases (H 2 , CO) in the fuel cell. The electrochemical properties of the fuel cell fed with 4 different fuel compositions were characterized between 710 and 860°C by I-V and EIS measurements at OCV and under polarization. In order to elucidate the limiting processes, impedance spectra obtained with different gas compositions were compared using the derivative of the real part of the impedance with respect of the natural logarithm of the frequency.Results show that internal steam reforming of ethanol takes place significantly on Ni-YSZ anode only above 760°C. Comparisons of results obtained with reformate gas showed that the electrochemical cell performance is dominated by the conversion of hydrogen. The conversion of CO also occurs either directly or indirectly through the water-gas shift reaction but has a significant impact on the electrochemical performance only above 760°C.

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Section: Comparison Of Performance With Syngas and Ethanol Mixturementioning

confidence: 86%

Section: Introductionmentioning

confidence: 99%

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Ethanol internal steam reforming in intermediate temperature solid oxide fuel cell

Diethelm¹,

herle²

2011

Journal of Power Sources

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“…[23][24][25][26][27][28] The model describes the different contribution of the process occurring during the reaction. [23][24][25][26][27] Considering the exposed above, the aim of this work is to investigate the electrocatalytical activity of Ti/(RuO 2 ) (x) Pt (1-x) electrodes prepared by the polymeric precursor method (PPM) toward CO and ethanol electrooxidation using cyclic voltammetry and chronoamperometric experiments. Besides, the characteristics of electrocatalytical activity of the electrodes for ethanol electrooxidation reaction at different potentials using impedance spectroscopy were determined.…”

Section: -14mentioning

confidence: 99%

“…[12][13][14][15][16][17][18][19][20][21][22] Electrochemical impedance spectroscopy (EIS) is a powerful technique to propose models, which describe these reactions. [23][24][25][26][27][28] The model describes the different contribution of the process occurring during the reaction. [23][24][25][26][27] Considering the exposed above, the aim of this work is to investigate the electrocatalytical activity of Ti/(RuO 2 ) (x) Pt (1-x) electrodes prepared by the polymeric precursor method (PPM) toward CO and ethanol electrooxidation using cyclic voltammetry and chronoamperometric experiments.…”

Section: Introductionmentioning

confidence: 99%

Ethanol electrooxidation using Ti/(RuO2)(x) Pt(1-x) electrodes prepared by the polymeric precursor method

Freitas¹,

Marchesi²,

Forim³

et al. 2011

J. Braz. Chem. Soc.

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Este trabalho descreve um estudo detalhado da oxidação eletroquímica de etanol sobre eletrodos de Ti/(RuO 2 ) (x) Pt (1-x) com várias composições, preparados pelo método de precursores poliméricos. Os resultados obtidos usando voltametria cíclica e cronoamperometria mostraram que a melhor composição dos eletrodos de Ti/(RuO 2 ) (x) Pt (1-x) para os processos de oxidação do CO e do etanol é Ti/(RuO 2 ) (0.5) Pt (0.5) . Nessa composição, a oxidação do CO e do etanol ocorreram em 380 mV e 220 mV mais negativos do que em Ti/Pt, respectivamente. Por outro lado, observou-se um aumento de 2.5 vezes na densidade de corrente para a oxidação do etanol sob potencial constante. Análises de HPLC in situ mostraram que os eletrodos de Ti/(RuO 2 ) (0.5) Pt (0.5) produziram baixas quantidades de ácido acético comparadas com aquelas quantidades geradas pelos eletrodos de Ti/ Pt ou Pt policristalina. Além disso, um produto que não é comum a partir da oxidação do etanol foi observado em eletrodos com maior teor de RuO 2 : o acetato de etila. Finalmente, os dados de impedância mostraram que os eletrodos com a composição Ti/(RuO 2 ) (0.5) Pt (0.5) apresentaram menores resistências de transferência de carga, entre as composições investigadas.This work describes a detailed study of the ethanol electrooxidation on Ti/(RuO 2 ) (x) Pt (1-x) electrodes using several compositions prepared by the polymeric precursor method. The results obtained using cyclic voltammetry and chronoamperometry showed that the best composition of Ti/(RuO 2 ) (x) Pt (1-x) electrodes for CO and ethanol oxidation processes is Ti/(RuO 2 ) 0.50 Pt 0.50 . On this electrode composition the onset of CO and the ethanol oxidation occurred at 380 mV and 220 mV more negative than on Ti/Pt, respectively. Besides, there was an increase of 2.5-fold in the current density for ethanol electrooxidation under constant potential polarization. The Ti/(RuO 2 ) 0.50 Pt 0.50 electrodes produced lower amount of acetic acid compared to Ti/Pt and polycrystalline Pt electrodes using in situ HPLC spectrometric analysis. Also, a non common product from ethanol oxidation could be observed on higher RuO 2 loads: ethyl acetate. Finally, the impedance data showed that Ti/(RuO 2 ) 0.50 Pt 0.50 electrode composition had the smallest charge transfer resistance for ethanol oxidation among those compositions investigated.Keywords: ethanol electrooxidation, polymeric precursor method, CO electrooxidation, eletrocatalysis, in situ HPLC IntroductionFuel cells are widely recognized as very attractive devices to obtain directly electric energy from the combustion of a chemical product. In the last decades, much attention has been devoted to the study of the electrooxidation of small organic molecules, due to their possible utilization as fuels in direct organic fuel cell (DOFCs) devices.1,2 Ethanol has emerged as important choice due to its low toxicity and volatility together with a higher energy density than methanol (8.01 kWh kg −1 versus 6.09 kWh kg −1). 3 Other important considerations for choos...

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Sulfur‐Tolerant Redox‐Reversible Anode Material for Direct Hydrocarbon Solid Oxide Fuel Cells

et al. 2012

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A novel composite anode material consisting of K(2) NiF(4) -type structured Pr(0.8) Sr(1.2) (Co,Fe)(0.8) Nb(0.2) O(4+δ) (K-PSCFN) matrix with homogenously dispersed nano-sized Co-Fe alloy (CFA) has been obtained by annealing perovskite Pr(0.4) Sr(0.6) Co(0.2) Fe(0.7) Nb(0.1) O(3-δ) (P-PSCFN) in H(2) at 900 °C. The K-PSCFN-CFA composite anode is redox-reversible and has demonstrated similar catalytic activity to Ni-based cermet anode, excellent sulfur tolerance, remarkable coking resistance and robust redox cyclability.

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Preparation and performance characterization of the Fe–Ni/ScSZ cermet anode for oxidation of ethanol fuel in SOFCs

Cited by 81 publications

References 23 publications

Ethanol internal steam reforming in intermediate temperature solid oxide fuel cell

Ethanol internal steam reforming in intermediate temperature solid oxide fuel cell

Ethanol electrooxidation using Ti/(RuO2)(x) Pt(1-x) electrodes prepared by the polymeric precursor method

Sulfur‐Tolerant Redox‐Reversible Anode Material for Direct Hydrocarbon Solid Oxide Fuel Cells

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