Physicochemical properties of proton-conductive Ba(Zr0.1Ce0.7Y0.1Yb0.1)O3−δ solid electrolyte in terms of electrochemical performance of solid oxide fuel cells

Somekawa, Takaaki; Matsuzaki, Yoshio; Tachikawa, Yuya; Matsumoto, Hiroshige; Taniguchi, Shunsuke; Sasaki, Kazunari

doi:10.1016/j.ijhydene.2016.07.265

Cited by 39 publications

(39 citation statements)

References 36 publications

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“…One is the larger amount of heat generated from SOEC internal resistance than that required for water decomposition at high current densities because of increasing operating voltage . Another possible reason for the efficiency loss at higher current density may be the electronic or hole conduction, since the proton‐conducting oxides are not unity at high voltage . However, all the Faraday efficiencies at electrolysis voltages up to 1.8 V were close to the theoretical 100%, which indicated the current leakage through BZCYYb electrolyte could be negligible at 500 °C.…”

Section: Resultsmentioning

confidence: 92%

3D Self‐Architectured Steam Electrode Enabled Efficient and Durable Hydrogen Production in a Proton‐Conducting Solid Oxide Electrolysis Cell at Temperatures Lower Than 600 °C

Ding

Zhang

et al. 2018

Advanced Science

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Hydrogen production via water electrolysis using solid oxide electrolysis cells (SOECs) has attracted considerable attention because of its favorable thermodynamics and kinetics. It is considered as the most efficient and low‐cost option for hydrogen production from renewable energies. By using proton‐conducting electrolyte (H‐SOECs), the operating temperature can be reduced from beyond 800 to 600 °C or even lower due to its higher conductivity and lower activation energy. Technical barriers associated with the conventional oxygen‐ion conducting SOECs (O‐SOECs), that is, hydrogen separation and electrode instability that is primarily due to the Ni oxidation at high steam concentration and delamination associated with oxygen evolution, can be remarkably mitigated. Here, a self‐architectured ultraporous (SAUP) 3D steam electrode is developed for efficient H‐SOECs below 600 °C. At 600 °C, the electrolysis current density reaches 2.02 A cm−2 at 1.6 V. Instead of fast degradation in most O‐SOECs, performance enhancement is observed during electrolysis at an applied voltage of 1.6 V at 500 °C for over 75 h, attributed to the “bridging” effect originating from reorganization of the steam electrode. The H‐SOEC with SAUP steam electrode demonstrates excellent performance, promising a new prospective for next‐generation steam electrolysis at reduced temperatures.

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Section: Resultsmentioning

confidence: 92%

3D Self‐Architectured Steam Electrode Enabled Efficient and Durable Hydrogen Production in a Proton‐Conducting Solid Oxide Electrolysis Cell at Temperatures Lower Than 600 °C

Ding

Zhang

et al. 2018

Advanced Science

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“…are completely equivalent. This analytical model is simple and has been applied to the analyzes of a wide variety of phenomenon of SOFCs with mixed ionic electronic conductors (MIECs), for example potential profile in electrolyte , current‐voltage characteristics , , leakage‐current , –, and energy efficiency , , . These reference works include recent researches , , , .…”

Section: Methodsmentioning

confidence: 99%

“…In terms of the application of this model to SOFCs, oxide‐ion conducting electrolytes were mainly studied , , . Recently, applications to proton‐conducting electrolytes have been developed and reported , , . However, Eq.…”

Section: Methodsmentioning

confidence: 99%

Modified Energy Efficiencies of Proton‐conducting SOFCs with Partial Conductions of Oxide‐ions and Holes

et al. 2019

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An analytical method to determine the electrochemical energy efficiencies of electrolytes with partial electronic conduction has been developed previously and reported in the literature. However, this analytical method does not address the effects of differing ionic species in electrolytes, i.e., the oxide‐ions or protons. Therefore, we aimed to modify this analytical method to account for the effects of differing ionic species, and applied it to compare the energy efficiencies of oxide‐ion conducting solid electrolytes such as yttria‐stabilized zirconia (YSZ) and gadolinia‐doped ceria (GDC) to proton‐conducting solid electrolytes, such as yttria‐doped barium zirconate (BZY). With the modification, difference in the influence of the fuel consumption between the oxide‐ion conducting electrolyte and the proton‐conducting electrolyte has been successfully taken into account. The energy efficiency of the BZY electrolyte relatively increased against those of YSZ or GDC electrolytes by the modification. Additionally, partial oxide‐ion conduction in the proton‐conducting electrolyte was successfully estimated using the modified analytical method.

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“…The formation of solid solutions between BaCeO 3 and BaZrO 3 are comparably easily occurring. It is also possible to form a solid solution by replacing a desired fraction of Ce in BaCeO 3 with Zr and other element that exhibit both sufficient proton conductivity as well as adequate chemical and thermal stability over a wider variety of conditions appropriate to fuel cell operation [10], [16], [21], [24]- [28]. It was found that doped zirconates gives improved chemical stability but reduced protonic conductivity compared to the doped cerates.…”

Section: Introductionmentioning

confidence: 99%

Highly dense and chemically stable proton conducting electrolyte sintered at 1200 °C

Hossain

Abdalla

Radenahmad

et al. 2018

International Journal of Hydrogen Energy

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The BaCe 0.7 Zr 0.1 Y 0.2-x Zn x O 3- (x = 0.05, 0.10, 0.15, 0.20) has been synthesized by the conventional solid state reaction method for application in protonic solid oxide fuel cell. The phase purity and lattice parameters of the materials have been studied by the room temperature X-ray diffraction (XRD). Scanning electron microscopy (SEM) has been done for check the morphology and grain growth of the samples. The chemical and mechanical stabilities have been done using thermogravimetric analysis (TGA) in pure CO 2 environment and thermomechanical analysis (TMA) in Argon atmosphere. The XRD of the materials show the orthorhombic crystal symmetry with Pbnm space group. The SEM images of the pellets show that the samples sintered at 1200 o C are highly dense. The XRD after TGA in CO 2 and thermal expansion measurements confirm the stability. The particles of the samples are in micrometer ranges and increasing Zn content decreases the size. The conductivity measurements have been done in 5% H 2 with Ar in dry and wet atmospheres. All the materials show high proton conductivity in the intermediate temperature range (400-700 o C). The maximum proton conductivity was found to be 1.0  10-2 S cm-1 at 700 o C in wet atmosphere for x = 0.10. From our study, 10 wt % of Zn seems to be optimum at the B-site of the perovskite structure. All the properties studied here suggest it can be a promising candidate of electrolyte for IT-SOFCs.

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Physicochemical properties of proton-conductive Ba(Zr0.1Ce0.7Y0.1Yb0.1)O3−δ solid electrolyte in terms of electrochemical performance of solid oxide fuel cells

Cited by 39 publications

References 36 publications

3D Self‐Architectured Steam Electrode Enabled Efficient and Durable Hydrogen Production in a Proton‐Conducting Solid Oxide Electrolysis Cell at Temperatures Lower Than 600 °C

3D Self‐Architectured Steam Electrode Enabled Efficient and Durable Hydrogen Production in a Proton‐Conducting Solid Oxide Electrolysis Cell at Temperatures Lower Than 600 °C

Modified Energy Efficiencies of Proton‐conducting SOFCs with Partial Conductions of Oxide‐ions and Holes

Highly dense and chemically stable proton conducting electrolyte sintered at 1200 °C

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