Development and Testing of a 5kW-Class Reversible Solid Oxide Cell System

Peters, Roland; Frank, Matthias; Tiedemann, Wilfried; Hoven, Ingo; Deja, Robert; Nguyen, Van Nhu; Blum, Ludger; Stolten, Detlef

doi:10.1149/09101.2495ecst

Cited by 14 publications

(10 citation statements)

References 3 publications

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“…Cells and stacks need to be designed, optimized, and manufactured to cope with these rapidly changing conditions to ensure long-term stability and robustness of the rSOC. Furthermore, high system efficiency requires high (>80 %) reactant conversion rates [14][15][16], and the possibilities for this electrolysis technology to operate at high current density should be explored. With these objectives in mind, this study aims to investigate durability at load cycling operation and optimized stack design for such reversible operation.…”

Section: Introductionmentioning

confidence: 99%

Test and characterization of reversible solid oxide cells and stacks for innovative renewable energy storage

Ploner

Pylypko²,

Cubizolles

et al. 2021

Fuel Cells

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This work aims at developing an innovative renewable energy storage solution, based on reversible Solid Oxide Cell (rSOC) technology. That is to say, one system optimized to operate either in electrolysis mode (SOEC) to store excess electricity to produce H 2 , or in fuel cell mode (SOFC) when energy needs exceed local production, to produce electricity and heat again from H 2 or any other fuel locally available. Firstly, work focused on optimization of the different layers constituting the single SOC cell to reach high initial performance applying state-of-the-art materials as previously reported [1]. Secondly, the initially highest performing cells were selected for long-term reversible SOFC/SOEC single cell tests. Thirdly, these cells were integrated in a stack design optimized for reversible operation at high degrees of H 2 and H 2 O utilization. The long-term single cell tests showed significant degradation in galvanostatic test periods during electrolysis but not in fuel cell mode prior to starting the reversible test operation while the degradation diminished during the subsequent rSOC operation of the cells operating at 700 C, +0.6 and -1.2 A/cm 2 in SOFC and SOEC modes respectively, at fuel utilization (FU) up to 80% in both modes. Electrochemical impedance spectroscopy analyses and post-mortem SEM investigations of tested single cells reveal that the fuel electrodes degraded significantly during the longterm single cell tests. Furthermore, long-term stack tests were conducted on 5-cell stacks, integrating both reference cells and optimised cells. The long-term stack tests were conducted applying different switches between SOFC and SOEC modes. Initially long duration tests (100h each mode) were performed in a mixture of 50% H 2 O and 50% H 2 to see the effect of the polarisation only. The alternating cycle SOEC/SOFC was repeated over a 1800 h testing period. Then stack switched daily from SOEC mode

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Section: Introductionmentioning

confidence: 99%

Test and characterization of reversible solid oxide cells and stacks for innovative renewable energy storage

Ploner

Pylypko²,

Cubizolles

et al. 2021

Fuel Cells

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“…Kết hợp với các cơ sở lưu trữ hydrogen giúp cung cấp các dịch vụ cân bằng cho lưới điện để tăng tỷ lệ sử dụng tổng thể của thiết bị. Hệ thống pin nhiên liệu thuận nghịch oxide rắn với công suất 5 kW đã thử nghiệm thành công [17].…”

Section: đIện Phân H 2 Ounclassified

Technologies for production of green hydrogen and hydrogen based synthetic fuels

Nguyen¹,

Truong²

2021

PVJ

Self Cite

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Hydrogen is an essential material/fuel for industry and energy conversion. The processes for producing hydrogen depend on the raw materials and energy source used. In terms of climate impacts, the most promising hydrogen production method is water electrolysis. The regenerative electrolysis process depends on the carbon intensity of the electricity and the efficiency of converting that electricity into hydrogen. The development of technologies to extract hydrogen (from conventional and renewable resources) tends to optimise the water electrolysis process using renewable energies by extending material durability, increasing performance efficiency, and reducing precious metal contents in catalysts, thereby lowering the production costs. The article introduces the latest advances in green hydrogen production technologies using renewable energies, particularly focusing on water and seawater electrolysis, combining electrolysis and solar energy as well as hydrogen-based synthetic fuel production, hydrogen production from biomass and biogas.

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“…Furthermore, the SOC technology can be operated in reversible mode i.e. load cycling between SOFC and SOEC mode is possible providing a technology relevant for applications with shift in needs from storage of electrical energy (SOEC operation) and power and heat generation (SOFC operation) (5)(6)(7)(8). The cell voltages of rSOC are continuous around open circuit voltage (OCV) i.e.…”

Section: Introductionmentioning

confidence: 99%

Load Cycling Tests of Reversible Solid Oxide Cells – Effects of Current Density, Steam Content, and Utilization

Pylypko¹,

Cubizolles²,

Mouginn³

2021

ECS Trans.

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Four single cell rSOC tests were conducted to investigate the effect of current density, steam content and degree of utilization both upon galvanostatic SOFC and SOEC testing, and load cycling operation. Long-term degradation tests were performed at 700°C during constant galvanostatic SOFC (250 h) and SOEC (250 h) conditions followed by load cycling operation (up to 1000 h) in cycles of 16 h SOFC and 8 h SOEC. Applied current densities were 0.6 A/cm2 and -1.2 A/cm2; and 0.4 A/cm2 and -0.6 A/cm2; inlet gas composition i.e. p(H2O)/p(H2) of 90/10 and dry H2, as well as a test applying p(H2O)/p(H2) of 50/50 for both modes. Furthermore, two different utilization degrees (80% and 40%) were applied. From these tests it is evident that the high current density is detrimental for the fuel electrode durability while high p(H2O) does not seem problematic and cells sustained mechanical integrity upon load cycling.

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Development and Testing of a 5kW-Class Reversible Solid Oxide Cell System

Cited by 14 publications

References 3 publications

Test and characterization of reversible solid oxide cells and stacks for innovative renewable energy storage

Test and characterization of reversible solid oxide cells and stacks for innovative renewable energy storage

Technologies for production of green hydrogen and hydrogen based synthetic fuels

Load Cycling Tests of Reversible Solid Oxide Cells – Effects of Current Density, Steam Content, and Utilization

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