Two orders of magnitude enhancement in oxygen evolution reactivity of La0.7Sr0.3Fe1−Ni O3− by improving the electrical conductivity

Fan, Lijun; Rautama, Eeva‐Leena; Lindén, J.; Sainio, Jani; Jiang, Hua; Sorsa, Olli; Han, Nana; Flox, Cristina; Zhao, Yicheng; Li, Yongdan; Kallio, Tanja

doi:10.1016/j.nanoen.2021.106794

Cited by 42 publications

(10 citation statements)

References 66 publications

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“…[47] Thus, it is plausible that both Co and Mn remain active in (Co0.7Mn0.3)Ox. Moreover, even though Co oxides are considered promising OER catalysts, they do not own sufficiently high electrical conductivity, [107][108][109] which is a desirable feature in OER catalysts [110][111][112] to favor the rate of electron transport through the material. [111] The introduction of Mn oxide into the Co oxide structure could improve the vacancies variation among the different metallic sites, [112] but also because the incorporation of Mn into Co oxides optimizes the electrical conductivity.…”

Section: Resultsmentioning

confidence: 99%

Stabilization of Co oxide during oxygen evolution in alkaline media by the introduction of Mn oxide

Villalobos

Morales

Antipin

et al. 2022

Preprint

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Improving the stability of electrocatalysts for the oxygen evolution reaction (OER) through materials design has received less attention than improving their catalytic activity. We explored the effect of Mn addition to a cobalt oxide for stabilizing the catalyst by comparing Na-containing CoOx and (Co0.7Mn0.3)Ox films electrodeposited in alkaline solution. The obtained disordered films were classified as layered oxides using X-ray absorption spectroscopy (XAS). The CoOx films showed a constant decrease in the catalytic activity during cycling, confirmed by oxygen detection, while that of (Co0.7Mn0.3)Ox slightly increased as measured by electrochemical metrics. These trends were rationalized based on XAS analysis of the metal oxidation states, which were Co2.8+ and Mn3.7+ near the surface after cycling. Thus, adding Mn to CoOx successfully stabilized the catalyst material and its activity during OER cycling. The development of stabilization approaches is essential to extend the durability of OER catalysts.

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Section: Resultsmentioning

confidence: 99%

Stabilization of Co oxide during oxygen evolution in alkaline media by the introduction of Mn oxide

Villalobos

Morales

Antipin

et al. 2022

Preprint

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“…Even though Co oxides are considered promising OER catalysts, they do not exhibit sufficiently high electrical conductivity, [107][108][109] which is a desirable feature in OER catalysts [110][111][112] as it benefits the rate of electron transport through the material. [111] The introduction of Mn 4 + into the predominantly Co 3 + host oxide of (Co 0.7 Mn 0.3 )O x introduces holes as charge carriers for conduction, while (high spin) Mn 3 + (0.645 Å) has a significantly larger ionic radius as compared to (low spin) Co 3 + (0.545 Å), [113] which causes local distortions that can increase charge mobility, e. g., via hopping.…”

Section: Sample Parametermentioning

confidence: 99%

Stabilization of a Mn−Co Oxide During Oxygen Evolution in Alkaline Media

et al. 2022

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Improving the stability of electrocatalysts for the oxygen evolution reaction (OER) through materials design has received less attention than improving their catalytic activity. We explored the effects of Mn addition to a cobalt oxide for stabilizing the catalyst by comparing single phase CoO x and (Co 0.7 Mn 0.3 )O x films electrodeposited in alkaline solution. The obtained disordered films were classified as layered oxides using X-ray absorption spectroscopy (XAS). The CoO x films showed a constant decrease in the catalytic activity during cycling, confirmed by oxygen detection, while that of (Co 0.7 Mn 0.3 )O x remained constant within error as measured by electrochemical metrics. These trends were rationalized based on XAS analysis of the metal oxidation states, which were Co 2.7 + and Mn 3.7 + in the bulk and similar near the surface of (Co 0.7 Mn 0.3 )O x , before and after cycling. Thus, Mn in (Co 0.7 Mn 0.3 )O x successfully stabilized the bulk catalyst material and its surface activity during OER cycling. The development of stabilization approaches is essential to extend the durability of OER catalysts.

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“…These strategies mainly include: (1) composition engineering, (2) defect engineering, (3) morphology engineering, (4) surface reconstruction, (5) hybrid-structure catalysis, and (6) crystal phase engineering (Figure ). − …”

Section: Strategies For Performance Optimization Of Perovskite Catalystsmentioning

confidence: 99%

Recent Advances on Perovskite Electrocatalysts for Water Oxidation in Alkaline Medium

Wei

Wang

2022

Energy Fuels

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Alkaline water splitting is a technique utilizing renewable resource-derived electricity to generate hydrogen with high purity. The oxygen evolution reaction (OER) with sluggish dynamics is the crucial half-reaction toward electrocatalytic water splitting, which needs a non-noble metal catalyst with high performance to make the reaction process be more energy-efficient and economical. Perovskite, as a kind of price moderate, compositional adjustable, structurally stable, and highly active material, has been widely used as the catalyst for the OER under alkaline conditions. In this review, we systematically expound the OERrelated catalytic mechanism, provide the evaluative criteria of catalytic performance, and then summarize the corresponding measurement methods of catalysts for the alkaline OER. Furthermore, our emphasis is given to the synthetic methods, the activity descriptors, and the performance optimization strategies of perovskite-based catalysts. Finally, we present a number of future directions on the development of more highly efficient perovskite-based catalysts for the alkaline OER.

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Two orders of magnitude enhancement in oxygen evolution reactivity of La0.7Sr0.3Fe1−Ni O3− by improving the electrical conductivity

Cited by 42 publications

References 66 publications

Stabilization of Co oxide during oxygen evolution in alkaline media by the introduction of Mn oxide

Stabilization of Co oxide during oxygen evolution in alkaline media by the introduction of Mn oxide

Stabilization of a Mn−Co Oxide During Oxygen Evolution in Alkaline Media

Recent Advances on Perovskite Electrocatalysts for Water Oxidation in Alkaline Medium

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