Inkjet printing infiltration of Ni-Gd:CeO2 anodes for low temperature solid oxide fuel cells

Wang, C.; Tomov, Rumen I.; Mitchell-Williams, Tom B.; Kumar, Rupesh; Glowacki, B.A.

doi:10.1007/s10800-017-1114-x

Cited by 21 publications

(16 citation statements)

References 41 publications

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“…An alternative way of controlling the wetting properties is synthesizing inks based on organic solvents. It was previously observed that EtOH based ink was shown to achieve a high degree of wetting on both metal and oxide surfaces without utilization of additional surfactants [16].…”

Section: Infiltration Strategiesmentioning

confidence: 99%

Inkjet Printing Functionalization of SOFC LSCF Cathodes

et al. 2019

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An important segment of the future renewable energy economy is the implementation of novel energy generation systems. Such electrochemical systems are solid oxide fuel cells, which have the advantage of direct conversion of the chemical energy stored in the fuel to electrical energy with high efficiency. Improving the performance and lowering the cost of solid oxide fuel cells (SOFCs) are strongly dependent on finding commercially viable methods for nano-functionalization of their electrodes via infiltration. Inkjet printing technology was proven to be a feasible method providing scalability and high-resolution ink delivery. LaxSr1−xCoyFe1−yO3−δ cathodes were modified using inkjet printing for infiltration with two different materials: Gd-doped ceria (CGO) commonly used as ion-conductor and La0.6Sr0.4CoO3–δ (LCO) commonly used as a mixed ionic electronic conductor. As-modified surface structures promoted the extension of the three-phase boundary (TPB) and enhanced the mechanisms of the oxygen reduction reaction. Electrochemical impedance measurements revealed significantly lowered polarization resistances (between 2.7 and 3.7 times) and maximum power output enhancement of 24% for CGO infiltrated electrodes and 40% for LCO infiltrated electrodes.

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Section: Infiltration Strategiesmentioning

confidence: 99%

Inkjet Printing Functionalization of SOFC LSCF Cathodes

et al. 2019

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“…However, the polarization-induced activation is generally not durable; the electrode relaxation gradually occurs after interruption of polarization. The impregnation of porous electrodes with solutions of cerium or praseodymium nitrates, which decompose to the related oxides upon heating, was found to be effective for enhancement of the electrode performance [ 7 , 8 , 9 , 10 ]. Cerium nitrate solution was successfully used for activation of Ni-cermet SOFC anodes [ 7 , 8 ], whereas the impregnation with a solution of praseodymium nitrate was reported to activate cathodes such as In 2 O 3 [ 9 ] and Pt [ 10 , 11 ].…”

Section: Introductionmentioning

confidence: 99%

“…The impregnation of porous electrodes with solutions of cerium or praseodymium nitrates, which decompose to the related oxides upon heating, was found to be effective for enhancement of the electrode performance [ 7 , 8 , 9 , 10 ]. Cerium nitrate solution was successfully used for activation of Ni-cermet SOFC anodes [ 7 , 8 ], whereas the impregnation with a solution of praseodymium nitrate was reported to activate cathodes such as In 2 O 3 [ 9 ] and Pt [ 10 , 11 ]. The observed decrease of the electrode polarization resistance was explained by extension of the oxygen reduction/oxidation reaction area due to infiltration of the oxide particles into the porous electrode matrix [ 7 , 8 , 9 , 10 ].…”

Section: Introductionmentioning

confidence: 99%

Activation of Porous Pt Electrodes Deposited on YSZ Electrolyte by Nitric Acid Treatment

2021

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The effect of nitric acid treatment on the electrochemical performance of porous Pt electrodes deposited on YSZ (abbreviation from yttria stabilized zirconia) electrolyte was investigated. Two identical symmetrical Pt/YSZ/Pt cells with porous Pt electrodes were fabricated, after which the electrodes of the first cell were kept as sintered, while those of the second cell were impregnated with HNO3 solution. The electrochemical behavior of the prepared electrodes was studied using impedance spectroscopy and cyclic voltammetry. Significant reduction of the polarization resistance of the HNO3-treated electrodes was revealed. The observed enhancement of the electrochemical performance of porous Pt electrodes was assumed to be caused by adsorption of NOx-species on YSZ and Pt surfaces, which promotes oxygen molecules dissociation and transport to the triple phase boundary by the “relay-race” mechanism. The obtained results allow for considering the nitric acid treatment of a porous Pt electrode as an effective way of electrode activation.

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“…The second goal is to be able to monitor or predict the catalyst deposition amount by tuning just a few parameters, such as solution concentration. Although, the dripping method is the most utilized technique, there are some innovative alternative methods applied to lower the steps required to deposit material and enhance the homogeneity, such as atomic layer deposition [112,120,132,136,149], inkjet printing [134,143,144,147,177,178], etc. The dripping process requires many infiltration repetitions of low-concentration metal salt solutions to achieve sufficient solid loading to form a percolated network.…”

Section: Infiltration Methodsmentioning

confidence: 99%

“…By tuning the infiltration step or the concentration of the precursor, particles can either be deposited discretely or in a connected network. Another catalytic material doped ceria (XDC, X=Metal), attracted attention due to its flexibility of use either in the anode or cathode or even the electrolyte material [30,32,37,42,44,45,51,53,58,59,61,63,64,69,72,76,77,80,83,87,91,96,99,100,102,103,105,107,109,113,121,122,130,134,140,147] . For example, gadolinium-doped ceria (GDC) acts as an ionic conductor, and also by switching the valence character of ceria from +4 to +3 repeatedly, nanoparticles can achieve hydrogen storage capability.…”

Section: Electrochemical Performance Enhancement By Catalyst Infiltramentioning

confidence: 99%

Investigation of Nano-ceria Catalyst Infiltration of Solid Oxide Fuel Cell (SOFC) Electrodes Using Bio-Inspired Catechol Surfactants

Ozmen¹

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Investigation of Nano-ceria Catalyst Infiltration of Solid Oxide Fuel Cell (SOFC) Electrodes Using Bio-Inspired Catechol Surfactants Ozcan Ozmen Development of solid oxide fuel cell (SOFC) electrodes with nano-structured grains can show enhanced power density with high catalytic activity owing to the higher surface area to volume ratio of the particles. However, the addition of nano-particles during the conventional electrode manufacturing process causes inevitable structural changes due to the coarsening of nano-particles at sintering temperatures. Wet impregnation/ infiltration methods are a practical and well-utilized method to form nanoparticles within the porous electrode microstructure of solid oxide fuel cells (SOFC) which requires relatively low calcination temperatures. Critical factors that impact the reduction of the electrode polarization using the nano-catalyst impregnation strategy include catalyst loading, decoration type, and volumetric distribution homogeneity through the porous electrode microstructure. These can mostly be tuned by performing repetitive infiltration cycles followed by a co-firing step after each cycle for calcination. This labor and timeintensive method continues until the desired nano-catalyst loading is achieved. The factors that may degrade the performance as inter-particle interactions, pore-clogging, and/or inhomogeneous deposition result in gas diffusion related to rapid cell voltage degradation issues. The objective of this work is to investigate organic electrode modifiers to enhance nanocatalyst infiltration efficiency and uniformity within a commercial nickel oxide (NiO)/ yttria stabilized zirconia (YSZ) anode support and lanthanum strontium manganite (LSM)/YSZ cathode systems. The aim is to reduce the process to minimal processing steps while increasing both the performance and stability of the SOFC by decorating the nano-catalyst deposition. In this study, nano-CeO2, ceria, was used as a redox catalyst system and efficiently inserted throughout both porous SOFCs electrodes simultaneously by using a bio-inspired surfactant-assisted infiltration protocol. The process includes the initial modification of the electrode pore walls with a catecholbased surfactant film, i.e., poly-dopamine (pDA), poly epinephrine (pNE) or other alternative surfactants from the catechol family. The nano-ceria layer is then deposited uniformly over the bio-template surfactant layer during a single submersion of the SOFC into a cerium salt solution. Voltage-current-power curves and impedance spectroscopy were used to characterize the electrochemical performance of the impregnated anode-supported SOFC button cells. The endgoal of the work was to develop an infiltration protocol that performs boosted initial power density (performance) with high-stability by mitigating the nano-catalyst coarsening. The infiltrated cells displayed up to 35% reduction in polarization over the baseline cell with high electrochemical stability during 300 hours of testing at 750 o C. The catechol surfactant depositio...

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Inkjet printing infiltration of Ni-Gd:CeO2 anodes for low temperature solid oxide fuel cells

Cited by 21 publications

References 41 publications

Inkjet Printing Functionalization of SOFC LSCF Cathodes

Inkjet Printing Functionalization of SOFC LSCF Cathodes

Activation of Porous Pt Electrodes Deposited on YSZ Electrolyte by Nitric Acid Treatment

Investigation of Nano-ceria Catalyst Infiltration of Solid Oxide Fuel Cell (SOFC) Electrodes Using Bio-Inspired Catechol Surfactants

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