Degradation mechanism of electrolyte and air electrode in solid oxide electrolysis cells operating at high polarization

Kim, Jeong-Hee; Ji, Hyunjin; Dasari, Hari Prasad; Shin, Dongwook; Song, Hyun Hoon; Lee, Jong-Ho; Kim, Byung-Kook; Je, Hae-June; Lee, Hae-Weon; Yoon, Kyung Joong

doi:10.1016/j.ijhydene.2012.10.113

Cited by 111 publications

(62 citation statements)

References 71 publications

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“…1.4 and the pits at the original TPB are generally larger than the ones formed in the middle of the area originally covered with the Mn film. In CO 2 +H 2 O ambient, the TPBs seem less attacked that in pure CO 2 environment while the interface between the YSZ and Mn patches (Panel C.3) shows a clear delamination, coherently with literature reports of the failure of the anode/electrolyte interface in SOECs [5,15].…”

Section: Electrochemical Measurements During Spectroscopysupporting

confidence: 86%

“…Apart from Cr contamination, that is typical for systems employing ferritic stainless steel interconnects [2][3][4][5][6][7][8], two key mechanisms have been considered: (i) electrode delamination and (ii) cation migration and/or segregation of passivating species [9][10][11][12][13][14][15]. Delamination of the oxygen electrode seems to be due to the presence of large oxygen activity gradients that causes the formation of gaseous oxygen within the electrolyte close to the electrode/electrolyte interface, resulting in generation of nanoporosity at the grain boundaries.…”

Section: Introductionmentioning

confidence: 99%

“…Delamination of the oxygen electrode seems to be due to the presence of large oxygen activity gradients that causes the formation of gaseous oxygen within the electrolyte close to the electrode/electrolyte interface, resulting in generation of nanoporosity at the grain boundaries. In fact, the loss of oxygen vacancies under anodic polarisation conditions of SOECs is reported to be a source of oxygen electrode deactivation [15]. According to the defect model [16], in real Sr-doped LaMnO 3 (LSM) electrodes the highly oxidising anodic environment results in the oxidation of the manganese species with concomitant decrease of oxygen vacancy concentration to ensure electro neutrality.…”

Section: Introductionmentioning

confidence: 99%

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An in situ near-ambient pressure X-ray Photoelectron Spectroscopy study of Mn polarised anodically in a cell with solid oxide electrolyte

Bozzini

Amati

Bocchetta

et al. 2015

Electrochimica Acta

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This paper reports an in situ study of the anodic behavior of a model solid oxide electrolysis cell (SOEC) by means of near-ambient pressure X-ray Photoelectron Spectroscopy (XPS) combined with near edge X-ray absorption fine structure (NEXAFS) measurements. The focus is on the anodic surface chemistry of MnO_x, a model anodic material already considered in cognate SOFC-related studies, during electrochemical operation in CO₂, CO₂/H₂O and H₂O ambients. The XPS and NEXAFS results we obtained, complemented by electrochemical measurements and SEM characterisation, reveal the chemical evolution of Mn under electrochemical control. MnO is the stable chemical form at open-circuit potential (OCP), while Mn₃O₄ forms under anodic polarisation in all the investigated gas ambients. Carbon deposits are present on the Mn electrode at OCP, but they are readily oxidised under anodic conditions. Prolonged operation of the MnO_x anode leads to pitting of the Mn films, damaging of the triple-phase boundary region and also to formation of discontinuities in the Mn patch. This is accompanied by chemical transformations of the electrolyte and formation of ZrC without impact on the surface chemistry of the Mn-based anode

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Section: Electrochemical Measurements During Spectroscopysupporting

confidence: 86%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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An in situ near-ambient pressure X-ray Photoelectron Spectroscopy study of Mn polarised anodically in a cell with solid oxide electrolyte

Bozzini

Amati

Bocchetta

et al. 2015

Electrochimica Acta

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“…The irreversible damage of YSZ electrolyte significantly increases the ohmic resistance and decreases the current efficiency of SOEC. Similarly, operation at high current density of 1.5 A cm −2 for 120 h results in internal crack of YSZ electrolyte 105a. For longer operation about 9000 h, the most evident change of the SOEC is the formation of transgranular longitudinal pores and pores along grain boundaries 105b.…”

Section: Degradationmentioning

confidence: 96%

“…Usually, electrolyte is very stable to operate for thousands of hours, however, under severe operation conditions, structural failure such as intergranular fracture, crack, and voids might form in electrolyte ( Figure A1–A3), especially along the grain boundaries of the electrolyte. At high electrolysis voltage up to 2.8 V, thin YSZ electrolyte layer is electroreduced, and voids are generated at the boundaries of YSZ granules in electrolyte, which is ascribed to the nucleation and growth of oxygen gas under the high electrolysis voltage 105c. The irreversible damage of YSZ electrolyte significantly increases the ohmic resistance and decreases the current efficiency of SOEC.…”

Section: Degradationmentioning

confidence: 99%

High‐Temperature CO₂ Electrolysis in Solid Oxide Electrolysis Cells: Developments, Challenges, and Prospects

et al. 2019

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which has caused serious global warming. According to Intergovernmental Panel on Climate Change, global warming of 1.5 °C above preindustrial levels will come true by 2055 and bring about severe environmental and ecological issues, [2] such as ocean acidification, sea level rise, and species extinction. Therefore, it is urgently needed to reduce the atmospheric CO 2 concentration. [3] Apart from utilizing renewable energy resources to substitute for fossil fuels, CO 2 capture and storage (CCS) processes, and CO 2 capture and utilization (CCU) processes have been developed to effectively diminish the existing atmospheric CO 2 concentration. [4] The CCS processes are often expensive and laborious, and face the risk of CO 2 leakage, while the CCU processes are able to convert the captured CO 2 to value-added carbon-containing chemicals powered by external energy and has attracted more and more research interests recently. However, the conversion of CO 2 to target products is relatively difficult due to its extremely stable CO bonds. Several approaches for CO 2 conversion have been developed, such as photosynthesis, thermocatalytic reduction, electrochemical reduction, and photochemical conversion. Compared with other approaches, electrochemical reduction is more attractive because of two reasons: 1) electrochemical reduction process is controllable through adjusting the applied voltage and reaction temperature, and 2) the process can utilize renewable energy resources such as wind, solar, hydroelectric, and geothermal energies to electrochemically convert CO 2 to useful chemicals, which forms a carbon-neutral energy cycle and simultaneously provides an efficient storage method for renewable energy resources.Several types of electrolysis cell have been systematically investigated for CO 2 electroreduction as listed in Table 1. The first type operates in H-shaped electrochemical cells with liquid electrolyte at low temperatures (<100 °C).[5] Gaseous CO 2 reactant is dissolved into the liquid electrolyte and transported to the electrode surface, which is subsequently electroreduced to CO, HCOOH, CH 4 , C 2 H 4 , C 2 H 5 OH, and so on. [1,6] Although high Faradaic efficiency of products from CO 2 electroreduction has been achieved by exploring efficient catalysts recently, the current density of CO 2 electrolysis is relatively low due to the low CO 2 solubility and the competitive High-temperature CO 2 electrolysis in solid-oxide electrolysis cells (SOECs) could greatly assist in the reduction of CO 2 emissions by electrochemically converting CO 2 to valuable fuels through effective electrothermal activation of the stable CO bond. If powered by renewable energy resources, it could also provide an advanced energy-storage method for their intermittent output. Compared to low-temperature electrochemical CO 2 reduction, CO 2 electrolysis in SOECs at high temperature exhibits higher current density and energy efficiency and has thus attracted much recent attention. The history of its development and its fundamental mech...

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Challenges in the development of reversible solid oxide cell technologies: a mini review

Jiang

2016

Asia-Pacific J Chem Eng

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High-temperature solid oxide cells (SOCs) are attractive for storage and conversion of renewable energy sources by operating reversibly in solid oxide fuel cell and solid oxide electrolysis cell modes. Solid oxide fuel cell is the most efficient energy conversion device for the electricity generation by electrochemically direct conversion of chemical energy of fuels such as hydrogen, methanol and methane, while under solid oxide electrolysis cell operation mode, hydrogen or syngas can be produced as fuels or feedstock for liquid fuels such as methanol, gasoline and diesel using electricity from renewable energy sources. This mini review will introduce briefly the principle, status and progress in the electrochemical energy conversion and storage process by reversible operation of high temperature SOCs. The challenges in key material and performance degradation issues associated with high-temperature fuel cell and electrolysis operation of SOCs will be concisely reviewed and discussed. Singapore. His research interests encompass solid oxide fuel cells, solid oxide electrolysis cells, proton exchange membrane fuel cells, water splitting, supercapacitors, electrocatalysis and nanostructured and mesoporous structured functional materials. Professor Jiang has published~315 journal papers, which have accrued over 10 500 citations and h-index of 58. He has authored and co-authored ten book chapters and four books on fuel cells and delivered over 70 invited public seminars. Figure 2. Reversibility of the LSM-YSZ interface of a solid oxide cell under cyclic cathodic and anodic polarization conditions. [43] Asia-Pacific Journal of Chemical Engineering CHALLENGES IN THE DEVELOPMENT OF REVERSIBLE SOC 389

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Degradation mechanism of electrolyte and air electrode in solid oxide electrolysis cells operating at high polarization

Cited by 111 publications

References 71 publications

An in situ near-ambient pressure X-ray Photoelectron Spectroscopy study of Mn polarised anodically in a cell with solid oxide electrolyte

An in situ near-ambient pressure X-ray Photoelectron Spectroscopy study of Mn polarised anodically in a cell with solid oxide electrolyte

High‐Temperature CO₂ Electrolysis in Solid Oxide Electrolysis Cells: Developments, Challenges, and Prospects

Challenges in the development of reversible solid oxide cell technologies: a mini review

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Degradation mechanism of electrolyte and air electrode in solid oxide electrolysis cells operating at high polarization

Cited by 111 publications

References 71 publications

An in situ near-ambient pressure X-ray Photoelectron Spectroscopy study of Mn polarised anodically in a cell with solid oxide electrolyte

An in situ near-ambient pressure X-ray Photoelectron Spectroscopy study of Mn polarised anodically in a cell with solid oxide electrolyte

High‐Temperature CO2 Electrolysis in Solid Oxide Electrolysis Cells: Developments, Challenges, and Prospects

Challenges in the development of reversible solid oxide cell technologies: a mini review

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High‐Temperature CO₂ Electrolysis in Solid Oxide Electrolysis Cells: Developments, Challenges, and Prospects