Properties of Ca1−xHoxMnO3 perovskite-type electrodes

Ferreira, Bruno; Jorge, M. E. Melo; Lopes, Manuel José; Nunes, M. R.; Pereira, M. I. da Silva

doi:10.1016/j.electacta.2009.05.054

Cited by 18 publications

(8 citation statements)

References 28 publications

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“…Further electrocatalytic correlation with the A-site cation substitution has also been found for the oxygen nonstoichiometric CaMnO 3−δ substituted with Ln (Ln = La, Nd, Sm, Gd, Y, and Ho) in alkaline solution. − Again, La 3+ substitution in La 2 x /3 Ca 1– x MnO 3−δ demonstrated a relatively high electronic conductivity at room temperature, even with 50 to 60% porosity. The high electronic conductivity of these materials, without conductive additives, is attributed to the existence of oxygen nonstoichiometry. , Among the La 2 x /3 Ca 1– x MnO 3−δ series, the material with the substitution level of x = 0.1 showed a promising discharge capacity in 5% LiOH solution, which was comparable to that of MnO 2 and graphite catalysts .…”

Section: Abo3‑δ Perovskite-type Catalystsmentioning

confidence: 99%

“…The high electronic conductivity of these materials, without conductive additives, is attributed to the existence of oxygen nonstoichiometry. , Among the La 2 x /3 Ca 1– x MnO 3−δ series, the material with the substitution level of x = 0.1 showed a promising discharge capacity in 5% LiOH solution, which was comparable to that of MnO 2 and graphite catalysts . In addition, an increase in current density achieved for the Ho x Ca 1– x MnO 3−δ catalysts, compared to CaMnO 3 , was attributed to the smaller particle size and the higher electrical conductivity …”

Section: Abo3‑δ Perovskite-type Catalystsmentioning

confidence: 99%

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Nonstoichiometric Oxides as Low-Cost and Highly-Efficient Oxygen Reduction/Evolution Catalysts for Low-Temperature Electrochemical Devices

et al. 2015

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Introduction 9870 1.1. Background 9870 1.2. Oxygen Catalysts 9871 1.3. Nonstoichiometric Oxides 9872 2. ABO 3-δ Perovskite-Type Catalysts 9873 2.1. General Introduction 9873 2.2. Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3−δ Oxygen Catalysts 9873 2.3. Effects of Cations 9876 2.3.1. Effects of A-Site Cations 9876 2.3.2. Effects of B-Site Cations 9877 2.3.3. Effects of A′-Site Cations 9878 2.3.4. Effects of B′-Site Cations 9879 2.4. Extrinsic Strategies for Enhancing Performance and Stability 9880 2.4.1. Controlling Phase Structure and Surface Activities 9880 2.4.2. Nanostructured Materials 9881 2.4.3. Crystallographic Orientations 9884 2.4.4. Amorphous Phases 9886 2.4.5. Composites 9886 2.5. Summary 9886 3. Layered-Perovskite-Type Catalysts 9887 3.1. Ruddlesden−Popper Phases 9887 3.2. Double Perovskites 9887 3.3. Summary 9889 4. Pyrochlore-Type Catalysts 9890 4.1. Structure and Properties 9890 4.2. Summary 9891 5. Other Typical Nonstoichiometric Oxides 9891 5.1. MnO x Oxygen Catalysts 9891 5.2. Ceria-Related Oxygen Catalysts 9892 5.3. NiO x -Based Oxygen Catalysts 9893 5.4. Delithiated LiCoO 2 −Related Oxygen Catalysts 9894 5.5. Summary 9894 6. Benchmarking Oxygen Catalysts 9894 6.1. Overview of the State-of-the-Art Oxygen Catalysts 9894 6.2. ORR/OER Bifunctional Oxygen Catalysts 9895 7. Design Principles 9897 7.1. Descriptors from Molecular Orbital Theory 9897 7.2. Descriptors from DFT Calculations 9899 8. Mechanistic Understanding 9900 9. Summaries and Research Directions 9904 9.1. Perovskite-Type Oxygen Catalysts 9904 9.2. Pyrochlore-Type Oxygen Catalysts 9904 9.3. MnO x , CeO x , and NiO x Related Oxygen Catalysts 9904 9.4. Catalyst Support 9904 9.5. Electrode Architectures 9905 9.6. Solid Electrolytes/Separators/Protectors 9905 9.7. System 9905 9.8. Advanced Characterizations 9905 9.9. Transferring Current Materials 9905 9.10.

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Section: Abo3‑δ Perovskite-type Catalystsmentioning

confidence: 99%

Section: Abo3‑δ Perovskite-type Catalystsmentioning

confidence: 99%

Nonstoichiometric Oxides as Low-Cost and Highly-Efficient Oxygen Reduction/Evolution Catalysts for Low-Temperature Electrochemical Devices

et al. 2015

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“…Deviation in faradaic efficiency started at ∼2.12 V RHE indicating loss of catalytic capability due to degrading side reactions. A second oxidation peak was followed by a low point at ∼2.44 V RHE likely due to oxidation of Mn associated with a brownish coloration of the electrolyte known for dissolved Mn ions of higher valence …”

Section: Resultsmentioning

confidence: 99%

Water Splitting Catalysis Studied by using Real‐Time Faradaic Efficiency Obtained through Coupled Electrolysis and Mass Spectrometry

et al. 2017

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An experimental setup and routine is presented for evaluating potential catalysts for water splitting by means of measuring the faradaic efficiency in real time through coupled potentiometry and mass spectrometry. The aim was to scale up an analytical cell unit towards the simulation of industrial conditions and generate results such as H 2 production versus power input at a certain potential or current density in addition to electrochemical parameters. Three types of electrodes were tested: A) planar metal electrodes; B) metal-foam-based electrodes; C) porous electrodes with carbon additive. The results verify that the experimental routine yields the desired accuracy, sensitivity, and a negligible accumulation of gaseous products in the cell; thus the faradaic efficiency is measured in real time. The metal-based electrodes of category A and B proved to be durable with low overpotentials and high gas output to power input, whereas three tested metal oxide electrodes in C revealed i) potential-dependent deviation in the faradaic efficiency, ii) phase decomposition, and iii) an optimum operational power range.

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“…In contrast, the ap plication of self-propagating high-temperature synthesis (SHS) for the mass production of perovskitetype oxides is quite attractive [13,14]. In particular, very significant re search was recently published on different perovskite SHS catalyst systems by workers such as Tyurkin, Chesalov, Luzhkova, Fraga, Pereira, Greca, Chinarro, Jurado, Civera, Pavese, Saracco, Specchia, Colomer, Fumo, Segadaes and others [15][16][17][18][19][20][21][22][23][24][25][26][27]. It offers several benefits for obtaining a ho mogeneous product with accurately controlled composi tion, minimizing operating time, and simplifying the pro cedure and equipment [28,29].…”

Section: Introductionmentioning

confidence: 98%

Self-propagating High-temperature Synthesis of La1−xSrxMnyFe1−yO3 Perovskites for Soot Combustion Catalyst

Hirano

Tosho

Watanabe

et al. 2012

High Temperature Materials and Processes

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Properties of Ca1−xHoxMnO3 perovskite-type electrodes

Cited by 18 publications

References 28 publications

Nonstoichiometric Oxides as Low-Cost and Highly-Efficient Oxygen Reduction/Evolution Catalysts for Low-Temperature Electrochemical Devices

Nonstoichiometric Oxides as Low-Cost and Highly-Efficient Oxygen Reduction/Evolution Catalysts for Low-Temperature Electrochemical Devices

Water Splitting Catalysis Studied by using Real‐Time Faradaic Efficiency Obtained through Coupled Electrolysis and Mass Spectrometry

Self-propagating High-temperature Synthesis of La1−xSrxMnyFe1−yO3 Perovskites for Soot Combustion Catalyst

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