Towards understanding of oxygen electrode processes during solid oxide electrolysis operation to improve simultaneous fuel and oxygen generation

Subotić, Vanja; Futamura, Shotaro; Harrington, George F.; Matsuda, Junko; Natsukoshi, Katsuya; Sasaki, Kazunari

doi:10.1016/j.jpowsour.2021.229600

Cited by 26 publications

(16 citation statements)

References 53 publications

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“…501 Under a high steam content of 90 vol %, significant Ni reoxidation was observed after operating for 200 h at 835 °C, 530 and nearly 50% of the Ni on the electrode surface was similarly found to be reoxidized after merely 80 h under the condition of H 2 :H 2 O = 20:80. 531 Through converting more steam into hydrogen and reducing the propensity toward Ni reoxidation, operating at large current density offers an effective strategy to alleviate the degradation of the hydrogen electrode under high steam content, 532 whereas the degradation of the oxygen electrode is concurrently promoted, 533 and thus an optimized current density requires being selected to maximize the durability of the whole SOEC.…”

Section: Degradation Of Oxygen Electrodesmentioning

confidence: 99%

Water Electrolysis toward Elevated Temperature: Advances, Challenges and Frontiers

et al. 2023

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Since severe global warming and related climate issues have been caused by the extensive utilization of fossil fuels, the vigorous development of renewable resources is needed, and transformation into stable chemical energy is required to overcome the detriment of their fluctuations as energy sources. As an environmentally friendly and efficient energy carrier, hydrogen can be employed in various industries and produced directly by renewable energy (called green hydrogen). Nevertheless, large-scale green hydrogen production by water electrolysis is prohibited by its uncompetitive cost caused by a high specific energy demand and electricity expenses, which can be overcome by enhancing the corresponding thermodynamics and kinetics at elevated working temperatures. In the present review, the effects of temperature variation are primarily introduced from the perspective of electrolysis cells. Following an increasing order of working temperature, multidimensional evaluations considering materials and structures, performance, degradation mechanisms and mitigation strategies as well as electrolysis in stacks and systems are presented based on elevated temperature alkaline electrolysis cells and polymer electrolyte membrane electrolysis cells (ET-AECs and ET-PEMECs), elevated temperature ionic conductors (ET-ICs), protonic ceramic electrolysis cells (PCECs) and solid oxide electrolysis cells (SOECs).

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Section: Degradation Of Oxygen Electrodesmentioning

confidence: 99%

Water Electrolysis toward Elevated Temperature: Advances, Challenges and Frontiers

et al. 2023

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“…Stability is another key metric for practical applications of SOEC. Unfortunately, noticeable oxidation facilely occurs when the proportion of H 2 O or CO 2 in the electrolysis feedstock gas is relatively high, − making it suffer a high degradation rate during prolonged operation, as irreversible electrode cracking can occur due to the volume expansion from Ni oxidation. , It is essential to control operating conditions (i.e., gas compositions, voltage, and temperature) to avoid degradation because high-temperature or high-current-density operating conditions are often limited by severe carbon deposition and metal agglomeration. , To address this issue, the incorporation of 10 wt % Fe into the Ni electrode was tentatively conducted. The oxidation of nickel was thus obviously inhibited by sacrificial Fe .…”

Section: Introductionmentioning

confidence: 99%

Toward High CO Selectivity and Oxidation Resistance Solid Oxide Electrolysis Cell with High-Entropy Alloy

Tong,

Ni,

Zhou

et al. 2024

ACS Catal.

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Ni-based cermet materials still persist as pronounced challenges for electrocatalysts in solid oxide electrolysis cells (SOECs), due to their insufficient CO2 catalytic efficiency and inferior resistance to oxidation. In this paper, a (Fe,Co,Ni,Cu,Mo) quinary high-entropy alloy is explored as an alternative cathode material, offering enhanced performance in the co-electrolysis of H2O and CO2 for renewable syngas production. In comparison to traditional nickel-based cathodes, an assembled SOEC employing the as-designed quinary high-entropy alloy exhibits a remarkable increase in CO2 conversion capacity and significantly enhanced oxidation resistance. In addition, the electrolysis current density increases by 18%, and a stability test for more than 110 h reveals no degradation. Moreover, the stability can be maintained for up to 40 h even without any protective gas. Morphological and spectroscopic analyses, coupled with density functional theory (DFT) calculations, elucidate that the high-entropy effect facilitates surface electron redistribution, which in turn contributes to the measurable activity by reducing the energy barrier of CO2 activation. Notably, the superior resistance to oxidation primarily originates from the in situ-formed spinel phase under oxidation conditions. This study demonstrates the satisfying performance of high-entropy alloys as cathode materials in SOEC, validating their high application potential in this field.

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“…Therefore, utilization of excess CO 2 is a scientific problem of great concern at present. Solid oxide electrolysis cell (SOEC) is an efficient energy conversion device that can electrolyze CO 2 to CO. − CO 2 electrolysis in SOEC includes two half-reactions: the oxygen evolution reaction (OER) at the anode and the electrochemical CO 2 reduction reaction at the cathode. , The OER process consists of the following elementary steps: oxygen ions transport across the electrolyte/electrode interface to triple-phase boundaries (TPBs) at the anode, partial oxygen ions directly lose electrons to form O 2 , and the rest oxygen ions migrate from TPBs to the anode surface losing electrons to generate O 2 . , The sluggish kinetics of OER is a bugbear for the SOEC performance improvement. , …”

Section: Introductionmentioning

confidence: 99%

“…6,7 The sluggish kinetics of OER is a bugbear for the SOEC performance improvement. 8,9 Perovskite oxide is the most common anode material in SOEC due to its high ionic and electronic conductivity, good chemical stability, and compatible coefficient of thermal expansion with the electrolyte. 10,11 However, its insufficient catalytic activity calls for efficient strategies to increase the ionic and electronic conductivity or enlarge the TPBs at the anode to enhance the OER activity.…”

Section: ■ Introductionmentioning

confidence: 99%

Promoting High-Temperature Oxygen Evolution Reaction via Infiltration of PrCoO_3−δ Nanoparticles

Liu

Feng

et al. 2022

ACS Appl. Energy Mater.

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The sluggish kinetics of the oxygen evolution reaction (OER) at the anode limits the performance of CO2 electrolysis in a solid oxide electrolysis cell (SOEC). As a result, much effort has been devoted to developing efficient catalysts for OER. Herein, a composite anode is exploited by infiltrating PrCoO3−δ (PC) nanoparticles onto the surface of Pr0.5Ba0.5Co0.7Fe0.2Ti0.1O3−δ-Gd0.2Ce0.8O2−δ (PBCFT-GDC). Electrochemical measurements, in situ X-ray photoelectron spectroscopy spectra, and physicochemical characterizations indicate that the addition of PC with high electrical conductivity could expand the triple-phase boundaries and motivate the oxygen spillover at PC/PBCFT-GDC interfaces, which further boosts the OER activity and CO2 electrolysis performance. With the PC infiltration amount increasing from 0 to 9 wt %, the maximum current density of 1.43 A cm–2 at 1.6 V and 800 °C is achieved for the SOEC with 6% PC/PBCFT-GDC anode, which is 43% higher than that of SOEC with bare PBCFT-GDC anode. This newly designed composite electrode material has a good application prospect as an active SOEC anode for CO2 electrolysis.

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Towards understanding of oxygen electrode processes during solid oxide electrolysis operation to improve simultaneous fuel and oxygen generation

Cited by 26 publications

References 53 publications

Water Electrolysis toward Elevated Temperature: Advances, Challenges and Frontiers

Water Electrolysis toward Elevated Temperature: Advances, Challenges and Frontiers

Toward High CO Selectivity and Oxidation Resistance Solid Oxide Electrolysis Cell with High-Entropy Alloy

Promoting High-Temperature Oxygen Evolution Reaction via Infiltration of PrCoO_3−δ Nanoparticles

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Towards understanding of oxygen electrode processes during solid oxide electrolysis operation to improve simultaneous fuel and oxygen generation

Cited by 26 publications

References 53 publications

Water Electrolysis toward Elevated Temperature: Advances, Challenges and Frontiers

Water Electrolysis toward Elevated Temperature: Advances, Challenges and Frontiers

Toward High CO Selectivity and Oxidation Resistance Solid Oxide Electrolysis Cell with High-Entropy Alloy

Promoting High-Temperature Oxygen Evolution Reaction via Infiltration of PrCoO3−δ Nanoparticles

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Promoting High-Temperature Oxygen Evolution Reaction via Infiltration of PrCoO_3−δ Nanoparticles