Improvement of Ni/SDC Anode by Alkaline Earth Metal Oxide Addition for Direct Methane-SOFC

Asamoto, Makiko; Miyake, Shingo; Sugihara, Kazunari; Yamaguchi, Shûhei; Yahiro, Hidenori

doi:10.1149/1.3205764

Cited by 3 publications

(3 citation statements)

References 12 publications

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“…Most of the reported Ni-SDC contains around 50 vol% Ni, similar to Ni-YSZ. We have evaluated Ni/SDC anodes containing no more than 20 wt% Ni [7][8][9][10]. As a result of suppressing Ni aggregation, the 20wt% Ni-SDC anodes exhibited higher anodic performance compared to those containing higher concentrations of Ni.…”

Section: Introductionmentioning

confidence: 99%

Impedance Study of Anodic Properties of Ni-Fe Impregnated SDC

et al. 2015

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Bimetallic Ni 1-x Fe x /SDC powders containing 20wt% Ni-Fe were prepared and their anodic properties for SOFC were evaluated. The impedance spectra of the Ni 1-x Fe x /SDC anodes at 800 o C consisted of the ohmic component, R ohmic , and depressed arcs, R HF and R LF . The R ohmic component was due to the solid electrolyte layer, (ScO 1.5 ) 0.18 (CeO 2 ) 0.01 (ZrO 2 ) 0.81 . The R HF component was significantly reduced by the Fe addition, but apparent dependence was not observed for the R LF component. The x=0.5 composition possessed the small R HF and R LF values. Accordingly, the single cell performance at 800 o C was the maximum at x=0.5, and that was in the order of x=0.5  0.2 > 0.8  0 >1.0. The mean crystallite size of Ni-Fe alloy increased approximately in this order. Therefore, we concluded that Fe addition to Ni decreases the particle size of Ni-Fe alloy, resulting in the enhancement of the catalytic activity of Ni 1-x Fe x /SDC anode.

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Section: Introductionmentioning

confidence: 99%

Impedance Study of Anodic Properties of Ni-Fe Impregnated SDC

et al. 2015

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“…23,24 However, most methane-fueled SOFC studies with Ni-(doped ceria) composite anodes have been operated with dry or humidified methane fuels (i.e. direct methane oxidation or internal SRM), 11,[25][26][27][28][29] and power generation with internal DRM has rarely been reported. Only recently, Loureiro et al 30 fabricated cermet anodes composed of nickel-copper alloy and gadolinium-doped ceria, and reported that alloying treatment for nickel using copper decreased polarization resistance under a synthetic biogas flow (75% CH 4 and 25% CO 2 ).…”

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confidence: 99%

“…Furthermore, an examination was made of a calcium-modified Ni-SDC anode, aiming at enhancing coking resistance and CO 2 reactivity by the addition of a basic calcium component. It should be noted that the use of basic oxides (CaO, BaO, SrO) to Ni-based anodes has been widely investigated for SOFCs with dry or humidified methane fuel, 26,27,33,34 but has seldom been tested for SOFCs with internal DRM. According to the literature, enhanced coking resistance in the modified anodes can be ascribed to watermediated oxidation of the deposited carbon 35,36 or suppression of the coke formation by modification of the electronic structure of metallic nickel to a slightly anionic state.…”

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confidence: 99%

Calcium-Modified Ni-SDC Anodes in Solid Oxide Fuel Cells for Direct Dry Reforming of Methane

Mishina

Fujiwara

Tada

et al. 2020

J. Electrochem. Soc.

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Direct internal reforming is one of the promising methods of utilizing hydrocarbon fuels in solid oxide fuel cells (SOFCs). Among direct internal reforming technologies, dry reforming of methane (DRM) is attracting attention as an alternative to steam reforming of methane. In this study, a cermet material composed of nickel and samarium-doped ceria (Ni-SDC) was investigated as an SOFC anode for the direct internal DRM operation. Compared to a conventional nickel-yttria-stabilized zirconia (Ni-YSZ) anode, the Ni-SDC anode showed superior current-voltage characteristics. However, poor carbon balances were recorded in anode outlet gas analysis, indicating coke formation on the Ni-SDC anode. The addition of calcium to the Ni-SDC anode was also tested. Measured anode outlet gas compositions suggested that the calcium addition suppressed coke formation, while the power generation performance of the pristine Ni-SDC anode was maintained. Microscopic observations showed that a certain part of the calcium additive existed as CaO particles on the anode surface, which could be responsible for the improved coking resistance.

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A robust carbon tolerant anode for solid oxide fuel cells

Ling

Wang

et al. 2015

Sci. China Mater.

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Solid oxide fuel cells (SOFCs) have been attracting remarkable attention as one of the most promising green energy conversion devices in the recent years. However, a high susceptibility of commonly used Ni-based anodes to carbon coking is a major challenge to the successful commercialization of SOFCs. In this study, a robust anode with Ni/TiO2−δ nano-network interfaces is reported, for low-cost SOFCs working at intermediate temperatures. This anode demonstrates an acceptable power density, and good stability with humidified (3% H2O) methane. X-ray diffraction (XRD) Rietveld refinement, X-ray photoelectron spectroscopy (XPS), electron paramagnetic resonance (EPR), and high resolution transmission electron microscopy (HRTEM) images reveal that the Ni/TiO2−δ network-composite anode forms from the in-situ reductive decomposition of NiTiO3. Numerous Ni/TiO2−δ interfaces that facilitate the water adsorption and the water-mediated carbon-removing reactions form during this decomposition process. Density functional theory calculations predict that at the Ni/TiO2−δ interfaces, the dissociated OH from H2O (adsorbed on TiO2−δ) reacts with C (locating on Ni) to produce CO and H species, which are then electrochemically oxidized (combined with O 2−) to CO2 and H2O at the triple-phase boundaries of the anode.

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Improvement of Ni/SDC Anode by Alkaline Earth Metal Oxide Addition for Direct Methane-SOFC

Cited by 3 publications

References 12 publications

Impedance Study of Anodic Properties of Ni-Fe Impregnated SDC

Impedance Study of Anodic Properties of Ni-Fe Impregnated SDC

Calcium-Modified Ni-SDC Anodes in Solid Oxide Fuel Cells for Direct Dry Reforming of Methane

A robust carbon tolerant anode for solid oxide fuel cells

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