Effect of Microstructure on Performances of Hydrogen and Oxygen Electrodes for Reversible SOEC/SOFC

Uchida, Hiroyuki; Puengjinda, Pramote; Miyano, Kohei; Shimura, Kazuki; Nishino, Hanako; Kakinuma, Katsuyoshi; Brito, Manuel E.; Watanabe, Masahiro

doi:10.1149/06801.3307ecst

Cited by 18 publications

(22 citation statements)

References 8 publications

(15 reference statements)

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“…Reports have exhibited long term performance of SOC cells (0.28 cm 2 ) Ni−Co‐SDC/Ni‐YSZ//YSZ//SDC//LSCF‐SDC upto 600 h operable at dual mode at 800 °C by applying cycles of ±0.5 A.cm −2 in reversible mode Morphologically engineered Ni−Co/SDC (Ni 80 Co 20 /SDC) composite fuel electrode with hollow spherical particles of SDC decorated with Ni−Co metal catalysts was proven to enhance the electrochemical reaction zone (ERZ) in both SOFC and SOEC operation in the temperature regime of 800–900 °C [168] . The rate of degradation is found to higher in EC‐mode but get minimized when operated in dual mode of operation [169] . LSGF‐(La 0.6 Sr 0.4 Ga 0.3 Fe 0.7 O 3 ) is reported to be a possible electrode candidate with good conductivity and stability.…”

Section: Selectivity Of Electrode Materialsmentioning

confidence: 99%

Advancing Electrode Properties through Functionalization for Solid Oxide Cells Application: A Review

Dey

Chaudhary²,

Parvatalu³

et al. 2023

Chemistry An Asian Journal

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Hydrogen energy has emerged as the only renewable which is capable of sustaining the prevalent energy crisis in conjunction with other intermittent sources. In this connection, solid oxide cell (SOC) is the most sustainable solid-state devices capable of recycling and reproducing green hydrogen fuel. It is operable in reversible modes viz, fuel cell (FC) and electrolysis cell (EC). SOC is capable of engaging multiple fuels thereby promoting carbon neutral planet. The all-solid design further augments the optimization of cost, efficiency, durability and endurance at higher temperature. Electrodes are therefore, an important component which is responsible for electrocatalytic processing of fuel and oxidant for higher recyclability of cell/stack. The present review article embarks a detailed overview on the past and present status of electrode composition, heterointerface engineering applicable for SOC's. Recent trends in electrode engineering and the possibilities for advancement in SOC is also reviewed with respect to both experimental and computational aspects.

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Section: Selectivity Of Electrode Materialsmentioning

confidence: 99%

Advancing Electrode Properties through Functionalization for Solid Oxide Cells Application: A Review

Dey

Chaudhary²,

Parvatalu³

et al. 2023

Chemistry An Asian Journal

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“…A part of this work was presented at the 14th International Symposium on Solid Oxide Fuel Cells (SOFC-XIV), Glasgow, Scotland (July [26][27][28][29][30][31] 2015).…”

Section: Acknowledgmentsmentioning

confidence: 99%

Effect of Microstructure on Performance of Double-Layer Hydrogen Electrodes for Reversible SOEC/SOFC

Puengjinda

Nishino

Kakinuma

et al. 2017

J. Electrochem. Soc.

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We have developed high-performance double-layer (DL) hydrogen electrodes for reversible solid oxide cells. The DL hydrogen electrode consisted of mixed conductor, samaria-doped ceria (SDC), with highly dispersed Ni or Ni-Co nanocatalysts as the catalyst layer (CL) and, on top of it, a thin Ni−SDC cermet as the current collecting layer (CCL). The performance of the DL hydrogen electrode was appreciably improved by controlling the microstructure. The use of a thin, porous CCL increased the electronic conducting path to and from the CL, while maintaining sufficient gas-diffusion rates of H 2 and H 2 O, and enlarging the effective reaction zone at the CL. The optimum CCL thickness was found to be 5 μm. The IR-free overpotentials η at the optimized DL hydrogen electrode in humidified hydrogen (p[H 2 O] = 0.4 atm) and T cell = 800 • C were 0.20 and −0.20 V at j = 0.5 and −0.5 A cm −2 , respectively, indicating a highly reversible operation. The use of a full cell with the configuration of Ni 0.9 Co 0.1 /SDC DL hydrogen electrode|YSZ electrolyte|SDC interlayer|LSCF−SDC O 2 electrode led to very promising results for the SOEC operation in which an IR-free electrolytic cell potential of 1.21 V at j = −0.5 A cm −2 and 800 • C was achieved. Nowadays, hydrogen is attracting much attention as an energy carrier suitable for long-term and large-scale storage. Electrolysis of water is one of the effective technologies to produce pure hydrogen in a single step. Among the various types of electrolysis cells, solid oxide electrolysis cells (SOECs) operating at high temperature (800-1000• C) present the highest conversion efficiency due to favorable thermodynamic and kinetic conditions. 1-7 An SOEC can be operated in reverse mode as a solid oxide fuel cell (SOFC) that directly converts the chemical energy in hydrogen gas into electrical energy with a high energy conversion efficiency. Thus, a reversible solid oxide cell (R-SOC) is regarded as an efficient reciprocal energy converter between hydrogen and electricity. [8][9][10][11][12] Since the pioneering work in late 1960s to nowadays, the materials commonly used in SOFCs have been swiftly adopted in SOECs, i.e., yttria-stabilized zirconia (YSZ) electrolytes, Ni-YSZ cermet hydrogen electrodes, and perovskite-type oxygen electrodes based on La 1−x Sr x MnO 3−δ (LSM) or La 1−x Sr x Fe 1−y Co y O 3−δ (LSCF).1-11 However, it is very important to develop high-performance electrodes for R-SOC as clearly demonstrated by recent modeling or calculation.9,12 The essential factors for improving electrode performance are a high electrocatalytic activity and an extended effective reaction zone (ERZ).9,13 The ERZ is located around the physical triple phase boundary (gas/oxide ion conductor/electronic conductor). In the case of Ni-YSZ cermet hydrogen electrode, for example, the polarization performance (the extension of the ERZ) strongly depends on the electrode microstructure (size and distribution of Ni and YSZ, their connectivity, thickness and porosity), which is closely related to the fabri...

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“…12)17) Uchida et al proposed the double-layer (DL) electrode, moreover, consisting of a catalyst layer (CL, nanometersized Ni nanoparticles loaded on MOEC oxides) with a current-collecting layer (CCL, composites of Ni and an oxide-ion-conducting electrolyte) for oxide-ion-conducting SOCs to improve the performance of the hydrogen electrode. 18), 19) Our group has also applied these DL concepts [CL, Ni(np) dispersed on porous mixed protonicallyelectronically conductive (MPEC) oxides with CCLs] to the hydrogen electrode of proton-conducting SOCs. 20) The performance of the DL hydrogen electrode was higher than that of a conventional composite electrode of Ni and MPEC oxide and was expected to be enhanced further by improvement of the CL's electronic conductivity.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and evaluation of double-layer electrodes using a Ni–BaCe0.50Zr0.27Y0.20Ni0.03O3−δ cermet with a fused-aggregate network structure as the hydrogen electrode of solid oxide cells

Nishikawa

Nishino

Brito

et al. 2018

J. Ceram. Soc. Japan

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We have evaluated double-layer hydrogen electrodes with catalyst layers (CLs) and current-collecting layers (CCLs) in order to apply them in proton-conducting solid oxide cells. The scaffolds of the CLs were fabricated from a composite of mixed protonically-electronically conductive (MPEC) perovskite oxide BaCe 0.50 Zr 0.27 Y 0.20-Ni 0.03 O 3¹¤ (BCZYN) and Ni on a BaCe 0.10 Zr 0.70 Y 0.20 O 3¹¤ electrolyte. Both powders were synthesized via a flame oxide-synthesis method and both had a unique microstructure, i.e., a fused-aggregate network structure [BCZYN(fans), Ni(fans)]. This unique structure was constructed from both a network of particles fused with their nearest neighbors and pores surrounded by the fused particles. This structure was found to be favorable for constructing both electronically conductive pathways and gas diffusion pathways in the CLs. Highly dispersed Ni nanoparticles [Ni(np)] were also loaded on the MPEC of BCZYN(fans) in the CLs. Composite CCLs of micrometer-sized BaCe 0.50 Zr 0.30 Y 0.20 O 3¹¤ and Ni were also fabricated on the CLs. The catalytic activity of a hydrogen electrode using a CL comprising a composite of BCZYN(fans) and Ni(fans) was higher than that of a CL comprising BCZYN(fans) at a Ni(np) loading amount of 30 vol.% due to the improvement of the electronic conductivity in CLs by Ni(fans). The catalytic activity of the hydrogen electrode using the CLs increased with increases in the Ni(np) loading amount, moreover, and reached saturation at around 30 vol.% due to relief from the effect of the depletion layer on the outer surface of BCZYN(fans).

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Effect of Microstructure on Performances of Hydrogen and Oxygen Electrodes for Reversible SOEC/SOFC

Cited by 18 publications

References 8 publications

Advancing Electrode Properties through Functionalization for Solid Oxide Cells Application: A Review

Advancing Electrode Properties through Functionalization for Solid Oxide Cells Application: A Review

Effect of Microstructure on Performance of Double-Layer Hydrogen Electrodes for Reversible SOEC/SOFC

Synthesis and evaluation of double-layer electrodes using a Ni–BaCe<sub>0.50</sub>Zr<sub>0.27</sub>Y<sub>0.20</sub>Ni<sub>0.03</sub>O<sub>3−δ</sub> cermet with a fused-aggregate network structure as the hydrogen electrode of solid oxide cells

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