Enhancement of low-temperature solid oxide fuel cell performance and durability via surface chemistry modification

Robinson, Ian; Huang, Yi‐Lin; Horlick, Samuel A; Hussain, Ayaz; Pesaran, Alireza; Wachsman, Eric D.

doi:10.1016/j.electacta.2023.141881

Cited by 10 publications

(2 citation statements)

References 40 publications

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Section: Resultsmentioning

confidence: 83%

“…We previously demonstrated this low-temperature (≤650 °C) processing and operation provided a dramatic improvement in SOFC PPD for electrocatalysts infiltrated into LSCF-GDC and SSC-GDC cathodes and identified a Pr−Sr−Co (PSC) type infiltrate to be the best. 23 In this study, we The Nyquist plot at 550 °C in Figure 1d shows the optimal scaffold firing temperature of 950 °C, as the cathode ASR is 0.25 Ω•cm 2 , 50−75% lower than the scaffolds fired at different temperatures. The scaffold sintering temperature effect is summarized in Figure 1e, which shows a reverse volcano behavior with the lowest ASR at 950 °C.…”

Section: ■ Experimental Sectionmentioning

confidence: 78%

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Scaffold Infiltrated Cathodes for Low-Temperature Solid Oxide Fuel Cells

Robinson,

Horlick,

Huang

et al. 2024

ACS Appl. Mater. Interfaces

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Lowering the operating temperature of solid oxide fuel cells (SOFCs) and electrolysis cells (SOECs) to reduce system cost and increase lifetime is the key to widely deploy this highly efficient energy technology, but the high cathode polarization losses at low temperatures limit overall cell performance. Here we demonstrate that by engineering a universal ceria-based scaffold with infiltrated nanoscale electrocatalysts, a low cathode polarization <0.25 Ω•cm 2 with remarkably high performance 1 W/cm 2 at 550 °C is achieved. The combination of low processing and operating temperature restrains the nanosized electrocatalysts, not only allowing fast oxygen transport but also providing an essential electronically connective network to facilitate electrochemical reactions without requiring the high-temperature processing of a separate cathode layer. Moreover, excellent SOFC durability was demonstrated for over 500 h. This work shows a promising pathway to reduce processing/system costs with all scalable ceramic processing techniques for the future development of low-temperature SOFCs and SOECs.

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Section: Resultsmentioning

confidence: 83%

Section: ■ Experimental Sectionmentioning

confidence: 78%

Scaffold Infiltrated Cathodes for Low-Temperature Solid Oxide Fuel Cells

Robinson,

Horlick,

Huang

et al. 2024

ACS Appl. Mater. Interfaces

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Influence of Electrode Potential on Oxygen Mobility Probed by Polarized Isotopic Exchange in Solid Oxide Electrolyser Cells: Insights for Electro‐Assisted Oxidation Reactions

Manon,

Nau,

Belin

et al. 2024

ChemCatChem

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Oxygen mobility was studied by oxygen isotopic exchange on three electrodes used in Solid Oxide Electrolyser Cells under polarization (La0.8Sr0.2MnO3 (LSM), La0.6Sr0.4Co0.2Fe0.8O3‐d (LSCF) and La2NiO4+d (LNO)). The rate of the surface and the bulk mechanisms for oxygen mobility is depending on the type of conductivity (electronic conduction or mixed ionic and electronic conductivity). It is shown that a one oxygen atom exchange is dominant for the surface path whereas a two oxygen atoms mechanism dominates for the bulk path. The rate constant for the bulk path is much higher than the one for the surface path by two orders of magnitude. Additionally, polarized oxygen isotopic exchange revealed that electrode overvoltage increases significantly the rate constant for the surface path, whereas its impact on the bulk path is negligible.

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