K-doped Sr2Fe1.5Mo0.5O6−δ predicted as a bifunctional catalyst for air electrodes in proton-conducting solid oxide electrochemical cells

Muñoz‐García, Ana B.; Pavone, Michele

doi:10.1039/c7ta03340k

Cited by 30 publications

(17 citation statements)

References 34 publications

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“…A volcano-type plot along the e g electron number was originally proposed by Suntivich et al, 17 and is widely accepted at present. 21,22,[39][40][41][42][43][44][45][46][47][48] Figure 4a shows η versus e g electron number for the perovskite oxides, where the e g electron numbers were estimated from the most likely electron configurations (Table S3) Indeed, these average values apparently followed a gradient volcano-like shape (dashed curve in Figure 4a). However, compared with the previous report, 17 it does not efficiently serve to describe OER activity because of wide dispersion of data points (see error bars in Figure 4a).…”

Section: Xrd Patterns Inmentioning

confidence: 99%

Systematic Study of Descriptors for Oxygen Evolution Reaction Catalysis in Perovskite Oxides

Yamada¹,

Takamatsu²,

Asai³

et al. 2018

J. Phys. Chem. C

117

109

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Ever proposed descriptors of catalytic activity for oxygen evolution reaction (OER) were systematically investigated. A wide variety of stoichiometric perovskite oxides ABO 3 (A = Ca, Sr, Y, La; B = Ti, V, Cr, Mn, Fe, Co, Ni, Cu) were examined as OER catalysts. The simplest descriptor, e g electron number of transition metal ion at B-site, was not applicable for OER overpotentials (η) of the compounds tested in this study. Another descriptor, oxygen 2p band center relative to Fermi energy (ε 2p), was not necessarily adequate for the most part of perovskite oxides. Eventually, a recently proposed descriptor, charge-transfer energy (Δ), displayed a linear relationship with η the most reasonably. Since Δ values were obtained from theoretical calculations, not only by spectroscopic experiments, systematic exploration for a wide range of compounds including hypothetical ones could be allowed. This finding proposes the charge-transfer energy as the most helpful descriptor for design of perovskite oxide catalyst for OER.

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Section: Xrd Patterns Inmentioning

confidence: 99%

Systematic Study of Descriptors for Oxygen Evolution Reaction Catalysis in Perovskite Oxides

Yamada¹,

Takamatsu²,

Asai³

et al. 2018

J. Phys. Chem. C

117

109

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“…Mo‐based double perovskites have attracted more and more attention due to their good mixed ionic‐electronic conductivity, mechanical stability and acceptable expansion behavior with various temperatures and pO 2 values . Moreover, it was found that these oxides (e.g., Sr 2 Fe 1.5 Mo 0.5 O 6−δ ) may have high bulk proton transport, which was favorable for proton‐conducting SOCs. In Ding et al's work, the BFM electrodes were prepared by solid state reaction (SSR) and Pechini methods .…”

Section: Functional Materials Of Proton‐conducting Socsmentioning

confidence: 99%

Gas Humidification Impact on the Properties and Performance of Perovskite‐Type Functional Materials in Proton‐Conducting Solid Oxide Cells

Wang

Medvedev

Shao

2018

Adv Funct Materials

103

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Fuel cells and electrolysis cells as important types of energy conversiondevices can be divided into groups based on the electrolyte material. However, solid oxide cells (SOCs) based on conventional oxygen-ion conductors are limited by several issues, such as high operating temperature, the difficulty of hydrogen purification from water, and inferior stability. To avoid these problems, proton-conducting oxides are proposed as electrolytes for SOCs in electrolysis and fuel cell modes. Since water vapor partial pressure (pH 2 O) is one of the main parameters determining the proton concentration in proton-conducting oxides (characteristics of which can be either improved or deteriorated), the pH 2 O control is extremely important for the optimization of the devices' performance and stability. This review provides an overview of the research progresses made for proton-conducting SOCs, especially for the impact of gas humidification on the operability and performance. Fundamental understanding of the main processes in proton-conducting SOCs and design principles for the key components are summarized and discussed. The trends, challenges, and future directions that exist in this dynamic field are also pointed out. This review will inspire interest from various disciplines and provide some useful guidelines for future development of proton-conductor-based energy storage and conversion systems.

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“…The cathodic CO 2 reduction reaction (CO 2 RR) is usually expressed in the Kröger-Vink notation as where e – is an excess free electron in n-type conductor, V O •• is the oxygen vacancy provided by the electrode and/or electrolyte materials, and O O × is the lattice oxygen atom. Based on the oxygen reduction reaction mechanism proposed by Muñoz-García and Pavone, the CO 2 RR processes might consist of elementary steps as follows, So, the cathode must have high catalytic activity and electronic and ionic conductivities.…”

Section: Introductionmentioning

confidence: 99%

Mixed-Conductor Sr₂Fe_1.5Mo_0.5O_6−δ as Robust Fuel Electrode for Pure CO₂ Reduction in Solid Oxide Electrolysis Cell

Chen

Yang

et al. 2017

ACS Sustainable Chem. Eng.

145

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Electrolysis of carbon dioxide to carbon monoxide, through which the greenhouse gas could be effectively utilized, using solid oxide electrolysis cells is now attracting much interest. Here, we show for the first time that the redox-stable Sr 2 Fe 1.5 Mo 0.5 O 6−δ (SFM) ceramic electronic-ionic conductor can be used as the electrocatalyst to electrolyze and convert 100% CO 2 to CO without using any safe gases like H 2 and CO. SFM maintained its cubic structure and had an electrical conductivity of 21.39 S cm −1 at 800 °C in 1:1 CO−CO 2 atmosphere. Its surface reaction coefficient for CO 2 reduction is 7.15 × 10 −5 cm s −1 at 800 °C. Compared with those reported for the typical oxide ceramic electrodes, high electrochemical performance has been demonstrated for single phase SFM cathode using 100% CO 2 as the feeding gas. For example, a current density of 0.71 A•cm −2 was obtained using a fuel cell supported on LSGM (La 0.9 Sr 0.1 Ga 0.8 Mg 0.2 O 3−δ ) electrolyte operated at 800 °C and an applied voltage of 1.5 V. The electrolysis performance was further improved by using SFM−Sm 0.2 Ce 0.8 O 2−δ composite cathode, and the current density increased to 1.09 A•cm −2 under the same operation conditions. Durability test at 800 °C for 100 h demonstrated a relatively stable performance for CO 2 electrolysis under harsh conditions of 100% CO 2 without safe gas and above 1 A cm −2 current density, which is seldom achieved in the literature but highly desirable for the commercial application, indicating that SFM is a highly promising ceramic fuel electrode for CO 2 electrolysis.

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K-doped Sr₂Fe_1.5Mo_0.5O_6−δ predicted as a bifunctional catalyst for air electrodes in proton-conducting solid oxide electrochemical cells

Abstract: Electronic structure features and surface reconstruction make K-doped Sr2Fe1.5Mo0.5O6−δ a promising electrode for both oxygen reduction and evolution reactions.

Cited by 30 publications

References 34 publications

Systematic Study of Descriptors for Oxygen Evolution Reaction Catalysis in Perovskite Oxides

Systematic Study of Descriptors for Oxygen Evolution Reaction Catalysis in Perovskite Oxides

Gas Humidification Impact on the Properties and Performance of Perovskite‐Type Functional Materials in Proton‐Conducting Solid Oxide Cells

Mixed-Conductor Sr₂Fe_1.5Mo_0.5O_6−δ as Robust Fuel Electrode for Pure CO₂ Reduction in Solid Oxide Electrolysis Cell

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K-doped Sr2Fe1.5Mo0.5O6−δ predicted as a bifunctional catalyst for air electrodes in proton-conducting solid oxide electrochemical cells

Abstract: Electronic structure features and surface reconstruction make K-doped Sr2Fe1.5Mo0.5O6−δ a promising electrode for both oxygen reduction and evolution reactions.

Cited by 30 publications

References 34 publications

Systematic Study of Descriptors for Oxygen Evolution Reaction Catalysis in Perovskite Oxides

Systematic Study of Descriptors for Oxygen Evolution Reaction Catalysis in Perovskite Oxides

Gas Humidification Impact on the Properties and Performance of Perovskite‐Type Functional Materials in Proton‐Conducting Solid Oxide Cells

Mixed-Conductor Sr2Fe1.5Mo0.5O6−δ as Robust Fuel Electrode for Pure CO2 Reduction in Solid Oxide Electrolysis Cell

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K-doped Sr₂Fe_1.5Mo_0.5O_6−δ predicted as a bifunctional catalyst for air electrodes in proton-conducting solid oxide electrochemical cells

Mixed-Conductor Sr₂Fe_1.5Mo_0.5O_6−δ as Robust Fuel Electrode for Pure CO₂ Reduction in Solid Oxide Electrolysis Cell