Nano-tailoring of infiltrated catalysts for high-temperature solid oxide regenerative fuel cells

Yoon, Kyung Joong; Biswas, Mridula; Kim, Hyo Jin; Park, Mansoo; Hong, Jongsup; Son, Ji‐Won; Lee, Jong Ho; Kim, Byung Kook; Lee, Hae Weon

doi:10.1016/j.nanoen.2017.04.024

Cited by 99 publications

(13 citation statements)

References 95 publications

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“…Figure (d) reveals that the most drastic reduction in the Bode plot is in the low-frequency regime (<10 3 Hz), which represents the polarization resistance in the cathode. This confirms that the reduction of the R p with the Ag grid is primarily attributed to the improvement of the cathodic reaction owing to the TPB enlargement and promotes the ORR, as previously discussed in the symmetric cell analyses. , Interestingly, the ohmic resistance also decreased ∼1.5-fold in the case of the SSC cathode with the Ag functional layer compared to the bare SSC cathode. It has been reported that the ohmic resistance decreased with presence of highly conductive material at the interface .…”

Section: Resultssupporting

confidence: 85%

Rational Design of a Metallic Functional Layer for High-Performance Solid Oxide Fuel Cells

Choi

Hwang

Kim

et al. 2019

ACS Appl. Energy Mater.

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The rational design of the electrode–electrolyte interface plays a crucial role in expediting the oxygen reduction reaction (ORR) kinetics of intermediate-temperature solid oxide fuel cells (IT-SOFCs). We employed metallic functional layers because of their high electrical conductivities and catalytic activities with respect to ORR kinetics. Using electrohydrodynamic (EHD) jet printing, we printed a metallic grid structure at the interface of Sm0.5Sr0.5CoO3−δ (SSC) and Gd0.1Ce0.9O2−δ (GDC) with Al, Ni, and Ag to systematically quantify the effects of the electrical conductivity and catalytic activity on ORR kinetics. Substantial improvements in interfacial properties were achieved with the metallic functional layers, manifested by reducing the polarization resistance to 12.5% of the bare SSC cathode. I–V characterization, electrochemical impedance spectroscopy (EIS) measurements, and distributed relaxation times (DRT) based on impedance fitting enabled the quantitative deconvolution and revealed that the enhanced electrical conductivity of the metallic functional layer was primarily responsible for the increased electrochemical performance compared to the enhanced catalytic activity. The SSC cathode with the Ag functional layer exhibited the highest peak power density of ∼670 mW/cm2 at 650 °C, which was higher than that of the bare SSC cathode by ∼1.8 times.

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Section: Resultssupporting

confidence: 85%

Rational Design of a Metallic Functional Layer for High-Performance Solid Oxide Fuel Cells

Choi

Hwang

Kim

et al. 2019

ACS Appl. Energy Mater.

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“…To investigate the effect of Pd in the internal SR reactions, two TF‐SOFCs were fabricated: a reference cell without Pd (denoted Ni‐YSZ cell hereafter) and a cell with Pd incorporation at the AS (denoted Pd‐Ni‐YSZ cell hereafter). Pd was doped into the AS using the infiltration method published elsewhere 49‐51 …”

Section: Methodsmentioning

confidence: 99%

“…Pd was doped into the AS using the infiltration method published elsewhere. [49][50][51] The anode-supported cells consisting of a Ni-YSZ substrate, Ni-YSZ anode-functional-layer (nano-AFL), bilayer electrolyte YSZ and gadolinia-doped ceria (GDC), and lanthanum strontium cobalt oxide (LSC) cathode were fabricated. One millimeter-thick anode substrates were fabricated by laminating seven NiO-YSZ tape layers (thickness of each layer was 150 μm, with pore former poly[methyl methacrylate]) and one NiO-YSZ layer (thickness was 30 μm, without pore former) at 75 C with 15 MPa uniaxial pressure.…”

Section: Gas Chromatography Measurementmentioning

confidence: 99%

Improved electrochemical performance and durability of butane‐operating low‐temperature solid oxide fuel cell through palladium infiltration

et al. 2020

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Low-operating-temperature solid oxide fuel cells (LT-SOFCs) with various kinds of fuel, such as hydrocarbons, biogas, natural gas, and oxygenated fuel has been an active SOFC research topic. However, conventional SOFC anodes comprised of nickel metal and yttria-stabilized zirconia composite (Ni-YSZ) experience rapid degradation when operated for the butane direct internal steam reforming (B-DISR), especially at a low temperature (LT) range. This study reveals that the impregnated Pd into the Ni-YSZ anode support of thin-film SOFCs (TF-SOFCs) is effective for achieving better performance and stability regarding the TF-SOFC in B-DISR at 600 C. Adding Pd as a dopant into Ni-YSZ significantly promotes the catalytic activity due to the Pd-Ni alloy formation, both on the YSZ grain and the Ni grain surface. The electrochemical performance of cells without Pd (Ni-YSZ cell) and a Pd-infiltrated Ni-YSZ anode (Pd-Ni-YSZ cell) are compared at 600 C for the B-DISR mode at a ratio of steam-to-carbon of 3. Finally, longterm durability tests were performed at 600 C and under 0.15 A cm −2. The Pd infiltration decreases the deterioration rate to 0.63 mV h −1 after the first 80 hours of operation for the Pd-Ni-YSZ cell, which was a significant improvement from that of the Ni-YSZ cell, 3.75 mV h −1 after 40 hours of operation.

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“…However, a wide range of experimental evidence has proven that Ni coarsening can accelerate electrochemical performance degradation, by damaging the cermet microstructure and reducing the active triple phase boundary length [6][7][8]. The investigation of Ni coarsening is also driven by the increasing interest in nanostructured infiltrated electrodes [9][10][11][12], whose initial performance before Ni dewetting makes this technology very promising for intermediate and low temperature operation [13][14][15]. However, due to the large dimensional disparity between nickel nanoparticles and the large YSZ particles of the scaffold, the dewetting mechanism itself remains challenging to investigate.…”

Section: Introductionmentioning

confidence: 99%

Unveiling the mechanisms of solid-state dewetting in Solid Oxide Cells with novel 2D electrodes

Song

Bertei

Wang

et al. 2019

Journal of Power Sources

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During the operation of Solid Oxide Cell (SOC) fuel electrodes, the mobility of nickel can lead to significant changes in electrode morphology, with accompanying degradation in electrochemical performance. In this work, the dewetting of nickel films supported on yttriastabilized zirconia (YSZ), hereafter called 2D cells, is studied by coupling in-situ environmental scanning electron microscopy (E-SEM), image analysis, cellular automata simulation and electrochemical impedance spectroscopy (EIS). Analysis of experimental E-SEM images shows that Ni dewetting causes an increase in active triple phase boundary (aTPB) length up to a maximum, after which a sharp decrease in aTPB occurs due to Ni de-percolation. This microstructural evolution is consistent with the EIS response, which shows a minimum in polarization resistance followed by a rapid electrochemical degradation. These results reveal that neither evaporation-condensation nor surface diffusion of Ni are the main mechanisms of dewetting at 560-800 °C. Rather, the energy barrier for pore nucleation within the dense Ni film appears to be the most important factor. This sheds light on the relevant mechanisms and interfaces that must be controlled to reduce the electrochemical degradation of SOC electrodes induced by Ni dewetting.

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Nano-tailoring of infiltrated catalysts for high-temperature solid oxide regenerative fuel cells

Cited by 99 publications

References 95 publications

Rational Design of a Metallic Functional Layer for High-Performance Solid Oxide Fuel Cells

Rational Design of a Metallic Functional Layer for High-Performance Solid Oxide Fuel Cells

Improved electrochemical performance and durability of butane‐operating low‐temperature solid oxide fuel cell through palladium infiltration

Unveiling the mechanisms of solid-state dewetting in Solid Oxide Cells with novel 2D electrodes

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