A promising Ni–Fe bimetallic anode for intermediate-temperature SOFC based on Gd-doped ceria electrolyte

Fu, Chuankai; Chan, Siew Hwa; Ge, Xiaoming; Liu, Q. L.; Paściak, G.

doi:10.1016/j.ijhydene.2011.07.119

Cited by 43 publications

(26 citation statements)

References 29 publications

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“…The parallel circuit with resistance (R 1 ) and constant phase element (Q 1 ) that accounts for the depressed semi-circle at high frequency is associated with the charge-transfer process at the electrode/electrolyte interface. The low-frequency semi-circular arc (R 2 Q 2 ) can be assigned to the gas adsorption and dissociation at the surface of the electrode [3,18,19]. The total polarization resistance of the single cell, R p , can be expressed as the sum of R 1 and R 2 .…”

Section: Powder Characterizationmentioning

confidence: 99%

Electrical reduction of perovskite electrodes for accelerating exsolution of nanoparticles

Chanthanumataporn

Hui

Yue

et al. 2019

Electrochimica Acta

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Growth of finely dispersed nanocatalysts by exsolution of metal nanoparticles from perovskite oxides under reducing conditions at elevated temperature is a promising approach of producing highly active catalytic materials. An alternative method of exsolution using an applied potential has been recently shown to potentially accelerate the exsolution process of nanoparticles that can be achieved in minutes rather than the hours required in chemical reduction. In the present study, we investigate exsolution of nanoparticles from perovskite oxides of La 0.43 Ca 0.37 Ni 0.06 Ti 0.94 O 3-γ (LCTNi) and La 0.43 Ca 0.37 Ni 0.03 Fe 0.03 Ti 0.94 O 3-γ (LCTNi-Fe) under applied potentials in carbon dioxide atmosphere. The impedance spectra of single cells measured before and after electrochemical poling at varying voltages showed that the onset of exsolution process occurred at 2 V of potential reduction. An average particle size of the exsolved nanoparticles observed after testing using a scanning electron microscopy was about 30-100 nm. The cells with the reduced electrodes exhibited desirable electrochemical performances not only in pure carbon dioxide (current density of 0.37 A cm −2 for LCTNi and 0.48 A cm −2 for LCTNi-Fe at 1.5 V) but also in dry hydrogen (0.36 W cm −2 for LCTNi and 0.43 W cm −2 for LCTNi-Fe).

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Section: Powder Characterizationmentioning

confidence: 99%

Electrical reduction of perovskite electrodes for accelerating exsolution of nanoparticles

Chanthanumataporn

Hui

Yue

et al. 2019

Electrochimica Acta

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“…The performance of Ni/YSZ and Ni/GDC as anodes in H/C fueled SOFCs can be improved by dispersing uniformly small amounts of either transition non-noble-metal additives (Sn, Kan et al, 2009;Kan and Lee, 2010a), Cu Hornés et al, 2007;Sin et al, 2007), Mo (Finnerty et al, 1998;An et al, 2011;Niakolas et al, 2013), Bi (Huang et al, 2009), and Fe (Park and Virkar, 2009;da Paz Fiuza et al, 2010;Kan and Lee, 2010b;Fu et al, 2011) or noble-metal dopands (Ru, Hibino et al, 2003;Modafferi et al, 2008), Pd (Nabae et al, 2006(Nabae et al, , 2008Babaei et al, 2009), Rh (Hibino et al, 2002b;Boaro et al, 2010;Ferrandon et al, 2010), Pt (Hibino et al, 2002a), and Au (Yentekakis, 2006;Gavrielatos et al, 2008;Yentekakis et al, 2008), which appear to be effective at intermediate operating temperatures (Rostrup-Nielsen and Alstrup, 1999;Goodenough and Huang, 2007). The aim of these research efforts was to enhance carbon tolerance and maintain catalytic performance through the formation of bimetallic alloys with Ni on the anode.…”

Section: Introductionmentioning

confidence: 99%

Effect of Au and/or Mo Doping on the Development of Carbon and Sulfur Tolerant Anodes for SOFCs—A Short Review

Niakolas

Neofytidis

Neophytides

2017

Front. Environ. Sci.

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HIGHLIGHTS• The kinetics of CH 4 steam reforming and partial oxidation are determined by the oxidation rate of CH x adsorbed species • The modification of the Ni/YSZ and Ni/GDC with Au and/or Au-Mo results in differentiated structures of atomically dispersed Au and/or Au-Mo at the surface and the bulk of the Ni particles.• At lean S/C NiAu/YSZ selectively oxidizes electrochemically the catalytically produced H 2 and CO, while NiAu/GDC is selective to the direct partial electrochemical oxidation of CH 4 to CO and H 2.• The modified electrodes show significant tolerance to C formation.• Au-Mo modification enhances the intrinsic sulfur tolerance properties of Ni/GDC.The presented work is a short review of the research attempts from our group with collaborators, during the last 15 years, which had as main objective to study and improve the electrocatalytic performance of Ni-based electrode materials for the CH 4 Internal steam Reforming process (ISR.) in Solid Oxide Fuel Cells (SOFCs). In particular, NiO/YSZ and NiO/GDC anode powders were modified with Au and/or Mo nano-particles via different preparation methods. These efforts resulted in anode materials with high tolerance and improved electrocatalytic activity under both carbon forming and sulfur poisoning conditions. The most important findings are being reviewed and critical findings are being highlighted 50 as to stress the key differences in the electrocatalytic performance between Ni/YSZ and Ni/GDC. The possible effects of Au and/or Mo addition on the physicochemical and strucutral properties of the cermets are thoroughly discussed as well as active functional layers in the form of anode SOFC electrodes.

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“…However, Ni-YSZ electrode/anode creates numerous problems in the working of solid oxide fuel cell at high temperature of 1000 o C. For example; material degradation, maintenance of high temperature, and high cost. Of course, Ni-YSZ cermet has been widely used as anode in an SOFC due to high catalytic activity and excellent electrical conductivity, but the structural and long-term performance stability of Ni-YSZ cermet anode is a critical issue [20]. Low temperature is desired to improve the stability of the electrode/anode material, which can help to produce low cost solid oxide fuel cell.…”

Section: Introductionmentioning

confidence: 99%

“…The activation energy of the sample 44(b) was found to be 2.7x10 -2 and 9.6x10 -2 eV from DC and AC data, respectively, which is shown in inset of figure 5(a) and 5(b). The small value of activation energy exhibits the existence of catalytic activity and capability of composite anode ANZ-GDC for transportation of H + /O 2ions when hydrogen fuel is provided[20].…”

mentioning

confidence: 99%

Synthesize and characterization of nanocomposite anodes for low temperature solid oxide fuel cell

Abbas

Raza

Khan

et al. 2015

International Journal of Hydrogen Energy

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Solid oxide fuel cells have much capability to become an economical alternative energy conversion technology having appropriate materials that can be operated at comparatively low temperature in the range of 400-600 o C. The nano-scale engineering has been incorporated to improve the catalytic activity of anode materials for solid oxide fuel cells. Nanostructured Al 0.10 Ni x Zn 0.90-xO oxides were prepared by solid state reaction, which were then mixed with the prepared Gadolinium doped Ceria GDC electrolyte. The crystal structure and surface morphology were characterized by XRD and SEM. The particle size was evaluated by XRD data and found in the range of 20-50 nm, which was then ensured by SEM pictures. The pellets of 13mm diameter were pressed by dry press technique and electrical conductivities (DC and AC) were determined by four probe techniques and the values have been found to be 10.84 and 4.88 S/cm, respectively at hydrogen atmosphere in the temperature range of 300-600 o C. The Electrochemical Impedance Spectroscopy (EIS) analysis exhibits the pure electronic behavior at hydrogen atmosphere. The maximum power density of ANZ-GDC composite anode based solid oxide fuel cell has been achieved 705mW/cm 2 at 550 o C.

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A promising Ni–Fe bimetallic anode for intermediate-temperature SOFC based on Gd-doped ceria electrolyte

Cited by 43 publications

References 29 publications

Electrical reduction of perovskite electrodes for accelerating exsolution of nanoparticles

Electrical reduction of perovskite electrodes for accelerating exsolution of nanoparticles

Effect of Au and/or Mo Doping on the Development of Carbon and Sulfur Tolerant Anodes for SOFCs—A Short Review

Synthesize and characterization of nanocomposite anodes for low temperature solid oxide fuel cell

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