Hybrid-solid oxide electrolysis cell: A new strategy for efficient hydrogen production

Kim, Junyoung; Jun, Areum; Gwon, Ohhun; Yoo, Seonyoung; Liu, Meilin; Shin, Jeeyoung; Lim, Tak‐Hyoung; Kim, Guntae

doi:10.1016/j.nanoen.2017.11.074

Cited by 244 publications

(110 citation statements)

References 29 publications

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“…Figure c compares the electrolysis performance of our optimized cells with those of oxygen‐conducting SOECs reported in the literature . Some recent advances of electrolysis cells based on proton conductors (such as ) are not shown here, as the operating temperatures (400–600 °C) and steam contents (up to 10 vol%) reported for these proton‐conducting SOECs are very different from the ones based on conventional oxygen conductors (700–900 °C, 50 vol% or higher steam content). The cell with Pr 6 O 11 ‐SDC oxygen electrode achieved very high electrolysis performance, surpassing conventional electrode‐supported cells and all previous metal‐supported electrolysis cells.…”

Section: Resultsmentioning

confidence: 90%

“…Such a device is usually operated in the relatively high‐temperature range of 700 to 900 °C, thus resulting in a high conversion efficiency, because (a) a significant part of the required energy can be provided by external heat for an ideal HTE and (b) the electrode reaction kinetics are faster at higher temperatures . To date, extensive efforts have been devoted to the development of highly efficient SOECs and promising results have been obtained …”

Section: Introductionmentioning

confidence: 99%

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Metal‐Supported Solid Oxide Electrolysis Cell with Significantly Enhanced Catalysis

et al. 2019

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High‐temperature electrolysis (HTE) using solid oxide electrolysis cells (SOECs) is a promising hydrogen production technology and has attracted substantial research attention over the last decade. While most studies are conducted on hydrogen electrode‐supported type cells, SOEC operation using metal‐supported cells has received minimal attention. The development of metal‐supported SOECs with performance similar to the best conventional SOECs is reported. These cells have stainless steel supports on both sides, 10Sc1CeSZ electrolyte and electrode backbones, and nano‐structured catalysts infiltrated on both hydrogen and oxygen electrode sides. Samarium‐doped ceria (SDC) mixed with Ni is infiltrated as a hydrogen electrode catalyst, and the effect of ceria:Ni ratio is studied. On the oxygen electrode side, catalysts including lanthanum strontium manganite (LSM), lanthanum strontium cobalt ferrite (LSCF), praseodymium oxide (Pr6O11), and their composite catalysts with SDC (i.e., LSM‐SDC, LSCF‐SDC, and Pr6O11‐SDC) are compared. Using the materials with highest catalytic activity (Pr6O11‐SDC and SDC40‐Ni60) and optimizing the catalyst infiltration processes, excellent electrolysis performance of metal‐supported cells is achieved. Current densities of −5.31, −4.09, −2.64, and −1.62 A cm−2 are achieved at 1.3 V and 50 vol% steam content at 800, 750, 700, and 650 °C, respectively.

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Section: Resultsmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Metal‐Supported Solid Oxide Electrolysis Cell with Significantly Enhanced Catalysis

et al. 2019

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“…Electrochemical energy storage and conversion devices such as batteries or fuel cells rely on the design of electrodes materials with mixed ion/electron conduction and solid electrolytes with high ionic conductivity . These properties are strongly dependent on the chemical composition, the solid network architecture and, at the atomic scale, the chemical bonding which has direct implications on the electronic band diagram as well as chemical or electrochemical potential for electrons at the Fermi level .…”

Section: Introductionmentioning

confidence: 99%

Associating and Tuning Sodium and Oxygen Mixed‐Ion Conduction in Niobium‐Based Perovskites

Gouget

Mauvy

Chung

et al. 2020

Adv Funct Materials

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Pure ionic conductors as solid‐state electrolytes are of high interest in electrochemical energy storage and conversion devices. They systematically involve only one ion as the charge carrier. The association of two mobile ionic species, one positively and the other negatively charged, in a specific network should strongly influence the total ion conduction. Nb5+‐ (4d0) and Ti4+‐based (3d0) derived‐perovskite frameworks containing Na+ and O2− as mobile species are investigated as mixed ion conductors by electrochemical impedance spectroscopy. The design of Na+ blocking layers via sandwiched pellet sintered by spark plasma sintering at high temperatures leads to quantified transport number of both ionic charge carriers tNa+ and tO2−. In the 350–700 °C temperature range, ionic conductivity can be tuned from major Na+ contribution (tNa+ = 88%) for NaNbO3 to pure O2− transport in NaNb0.9Ti0.1O2.95 phase. Such a Ti‐substitution is accompanied with a ≈100‐fold increase in the oxygen conductivity, approaching the best values for pure oxygen conductors in this temperature range. Besides the demonstration of tunable mixed ion conduction with quantifiable cationic and anionic contributions in a single solid‐state structure, a strategy is established from structural analysis to develop other architectures with improved mixed ionic conductivity.

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“…A detailed review of the developments of ceria‐carbonate composite based SOFC can be referred in Fan et al In SOFC with such a composite electrolyte, both proton and oxygen ion can transport through the electrolyte, which causes water generation in both electrodes . In a most recent work conducted by Kim et al, it has been validated experimentally that the hybrid conduction property of electrolyte can greatly improve the cell performance. The water generation rates in SOFC anode and cathode are related to the effective conductivity ( σ eff ) of oxygen ion and proton of the composite electrolyte, respectively.…”

Section: Introductionmentioning

confidence: 99%

The microstructure effect on ion conduction in composite electrolyte

Zheng

Shen

2018

Int J Energy Res

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Summary In this work, the microstructure of composite electrolyte is reconstructed by randomly packing cubes, and the charge transport process is simulated to calculate the effective conductivity ratio σeff/σ0 of the designated conducting phase. Effects of the volume fraction and the electrolyte particle size on σeff/σ0 are also examined. Results show that σeff/σ0 is independent of the particle size but sensitive to its volume fraction. Finally, a new formula is proposed to quickly predict the σeff/σ0 of the designated conducting phase in composite electrolyte with varying compositions.

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Hybrid-solid oxide electrolysis cell: A new strategy for efficient hydrogen production

Cited by 244 publications

References 29 publications

Metal‐Supported Solid Oxide Electrolysis Cell with Significantly Enhanced Catalysis

Metal‐Supported Solid Oxide Electrolysis Cell with Significantly Enhanced Catalysis

Associating and Tuning Sodium and Oxygen Mixed‐Ion Conduction in Niobium‐Based Perovskites

The microstructure effect on ion conduction in composite electrolyte

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