Fabrication of protonic ceramic fuel cells via infiltration with Ni nanoparticles: A new strategy to suppress NiO diffusion &amp; increase open circuit voltage

Han, Donglin; Kuramitsu, Akiko; Onishi, Takayuki; Noda, Yohei; Majima, Masatoshi; Uda, Tetsuya

doi:10.1016/j.ssi.2019.115189

Cited by 15 publications

(14 citation statements)

References 31 publications

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“…And it is found, in this study, that the redox cycles in Ce‐rich samples containing Ni makes the grain boundary conductivity worse and the electrolyte brittle. New sintering additives or new process for cell fabrication ( e. g ., fabricating a bilayer BZCY20 half cell, and infiltrating Ni nanoparticles into the porous layer [43] ) to avoid the diffusion of Ni from the electrode substrate during the co‐sintering is therefore essential to further improve the performance of fuel cells and electrolysis cells using BZY20 or BZCY20 electrolytes.…”

Section: Discussionmentioning

confidence: 99%

Proton Conductive BaZr_0.8‐xCe_xY_0.2O_3‐δ: Influence of NiO Sintering Additive on Crystal Structure, Hydration Behavior, and Conduction Properties

et al. 2020

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Y‐doped BaZrO3, BaCeO3 and BaZr1‐xCexO3 show high proton conductivity at intermediate temperature and are promising electrolyte candidates in electrochemical devices. However, in most cases, the present cell fabrication process seems to be unavailable to avoid the addition of NiO, which is either added to improve the sinterability of these electrolyte or diffuses from the electrode substrate during co‐sintering. In this work, a systematic investigation was performed to study the effect of NiO on BaZr0.8‐xCexY0.2O3‐δ (BZCY20) covering the full Ce range from 0 to 0.8. The results revealed that regardless of the composition of BZCY20, both the dehydration temperature and proton concentration decreased by adding NiO, which further greatly decreased the ionic conductivity and the transport number. And it is found that the redox cycles in Ce‐rich samples containing Ni makes the grain boundary conductivity worse and the electrolyte brittle. The conclusion is that NiO is detrimental to the performance of the electrochemical cells using these materials as the electrolyte, although compromise might be achieved in certain degree by tuning the Ce content. However, it should be noted that to further improve the cell performance, a new sintering additive or new processing for cell fabrication is essential.

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Section: Discussionmentioning

confidence: 99%

Proton Conductive BaZr_0.8‐xCe_xY_0.2O_3‐δ: Influence of NiO Sintering Additive on Crystal Structure, Hydration Behavior, and Conduction Properties

et al. 2020

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“…Acceptor-doped BaZrO 3 is known for its high proton conductivity at the intermediate temperature range (450–700 °C) − and excellent chemical stability against carbon dioxide and moisture. , Therefore, it is attracting increasing interest for application as an electrolyte in fuel cells and electrolysis cells. − Also, 20 mol % Y-doped BaZrO 3 (BaZr 0.8 Y 0.2 O 3−δ , BZY20) shows the highest proton conductivity (∼0.01 S cm –1 at 450 °C ,, ) and is regarded to be the one of the most promising electrolytes. Although almost pure proton conduction generates in the acceptor-doped BaZrO 3 by exposing to a wet reducing atmosphere, it appears to be partially electronic hole-conductive at the temperature higher than 500 °C in an oxidizing atmosphere. − The hole conduction seems to only impair the performance of the fuel cell slightly since the chemical potential of oxygen at the oxygen electrode will be lowered in the fuel cell mode with the hole conduction suppressed. , However, in the electrolysis cell mode, the chemical potential of oxygen at the oxygen electrode will be elevated, leading to the enhancement of the hole conduction, and therefore decreases in both faradaic and energy efficiencies .…”

Section: Introductionmentioning

confidence: 99%

Protonated BaZr_0.8Y_0.2O_3−δ: Impact of Hydration on Electrochemical Conductivity and Local Crystal Structure

Han

Toyoura

Uda

2021

ACS Appl. Energy Mater.

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Acceptor-doped BaZrO 3 is a promising electrolyte candidate in fuel cells and electrolysis cells due to its high proton conductivity and excellent chemical stability. However, it turns to be partially hole-conductive in an oxidizing atmosphere, resulting in the degraded performance of these electrochemical devices. Based on the knowledge of defect chemistry on BaZrO 3 , its electrochemical properties can be tuned by simply controlling the partial pressure of oxygen (p O 2 ) and water vapor (p H 2 O ) in the atmosphere. In this work, we investigated the hydration behavior of BaZrO 3 doped with Y or Yb under p H 2 O varying from 0.03 to 0.51 atm and found that both the proton concentration and lattice constants increased for BaZr 0.8 Y 0.2 O 3−δ (BZY20) and BaZr 0.8 Yb 0.2 O 3−δ (BZYb20) with increasing p H 2 O . Also, the chemical expansion coefficients of (0.882 ± 0.036) × 10 −2 and (1.44 ± 0.067) × 10 −2 per one proton per unit cell were estimated for BZY20 and BZYb20, respectively. The change in the local crystal structure due to such chemical expansion induced by water incorporation was probed by EXAFS analysis, and the result coincides with the reported insight that the oxide ions and protons are more favorable to reside in the vicinity to Y cations. Furthermore, it is effective to suppress the hole conduction by elevating p H 2 O and lowering p O 2 ; for example, the ionic transport number (t ion ) at 600 °C can be increased to be higher than 0.9 by elevating p H 2 O over 0.20 atm, suggesting an effective and feasible strategy to improve the performance of the electrochemical devices with the BZY20 electrolyte.

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“…The electrolyte deposition was carried out at a temperature of 750 °C, so limiting the diffusion of Ni toward the electrolyte. Following the strategy of blocking the diffusion of Ni into the electrolyte layer, Han et al adopted a device fabrication consisting of the infiltration of the Ni particles into the BZY porous backbone of the anode, which was previously cosintered with the electrolyte at high temperature, while Anggia et al cut it short proposing an all-ceramic Ni-free (La 0.8 Sr 0.2 )(Cr 0.5 Mn 0.5 )O 3−δ –Ba(Zr 0.75 Y 0.15 )O 3−δ composite.…”

Section: Anode Interfacesmentioning

confidence: 99%

Solid–Solid Interfaces in Protonic Ceramic Devices: A Critical Review

Chiara

Giannici

Pipitone

et al. 2020

ACS Appl. Mater. Interfaces

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The literature concerning protonic ceramic devices is critically reviewed focusing the reader’s attention on the structure, composition, and phenomena taking place at solid–solid interfaces. These interfaces play a crucial role in the overall device performance, and the relevance of understanding the phenomena taking place at the interfaces for the further improvement of electrochemical protonic ceramic devices is therefore stressed. The grain boundaries and heterostructures in electrolytic membranes, the electrode–electrolyte contacts, and the interfaces within composite anode and cathode materials are all considered, with specific concern to advanced techniques of characterization and to computational modeling by ab initio approaches. An outlook about future developments and improvements highlights the necessity of a deeper insight into the advanced analysis of what happens at the solid–solid interfaces and of in situ/operando investigations that are presently sporadic in the literature on protonic ceramic devices.

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Fabrication of protonic ceramic fuel cells via infiltration with Ni nanoparticles: A new strategy to suppress NiO diffusion & increase open circuit voltage

Cited by 15 publications

References 31 publications

Proton Conductive BaZr_0.8‐xCe_xY_0.2O_3‐δ: Influence of NiO Sintering Additive on Crystal Structure, Hydration Behavior, and Conduction Properties

Proton Conductive BaZr_0.8‐xCe_xY_0.2O_3‐δ: Influence of NiO Sintering Additive on Crystal Structure, Hydration Behavior, and Conduction Properties

Protonated BaZr_0.8Y_0.2O_3−δ: Impact of Hydration on Electrochemical Conductivity and Local Crystal Structure

Solid–Solid Interfaces in Protonic Ceramic Devices: A Critical Review

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Fabrication of protonic ceramic fuel cells via infiltration with Ni nanoparticles: A new strategy to suppress NiO diffusion & increase open circuit voltage

Cited by 15 publications

References 31 publications

Proton Conductive BaZr0.8‐xCexY0.2O3‐δ: Influence of NiO Sintering Additive on Crystal Structure, Hydration Behavior, and Conduction Properties

Proton Conductive BaZr0.8‐xCexY0.2O3‐δ: Influence of NiO Sintering Additive on Crystal Structure, Hydration Behavior, and Conduction Properties

Protonated BaZr0.8Y0.2O3−δ: Impact of Hydration on Electrochemical Conductivity and Local Crystal Structure

Solid–Solid Interfaces in Protonic Ceramic Devices: A Critical Review

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Proton Conductive BaZr_0.8‐xCe_xY_0.2O_3‐δ: Influence of NiO Sintering Additive on Crystal Structure, Hydration Behavior, and Conduction Properties

Proton Conductive BaZr_0.8‐xCe_xY_0.2O_3‐δ: Influence of NiO Sintering Additive on Crystal Structure, Hydration Behavior, and Conduction Properties

Protonated BaZr_0.8Y_0.2O_3−δ: Impact of Hydration on Electrochemical Conductivity and Local Crystal Structure