A Carbon-Free Ag–Co3O4 Composite as a Bifunctional Catalyst for Oxygen Reduction and Evolution: Spectroscopic, Microscopic and Electrochemical Characterization

Amin, Hatem M. A.; Bondue, Christoph J.; Eswara, Santhana; Kaiser, Ute; Baltruschat, Helmut

doi:10.1007/s12678-017-0364-z

Cited by 39 publications

(59 citation statements)

References 63 publications

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“…i) Transition metal oxides and hydroxides such as spinels,, perovskites,, hydroxides and layered double hydroxides (LDH) have been proven to be the best performing Ir‐ and Ru‐free class of materials so far. In particular, NiFe (oxy)hydroxide electrodes lately revealed an outstanding OER activity and stability which is even higher than that of the IrO 2 standard catalyst …”

Section: Introductionmentioning

confidence: 99%

Metal‐Rich Chalcogenides as Sustainable Electrocatalysts for Oxygen Evolution and Reduction: State of the Art and Future Perspectives

Amin

Apfel

2020

Eur J Inorg Chem

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The rational design of high-performance and costeffective electrocatalysts is a key for the development of sustainable energy systems such as electrolyzers, fuel cells and metal-air batteries. Although water splitting and fuel cells are commercially mature technologies, they are still limited on large scale primarily due to the abundancy of the currently utilized expensive materials as well as the sluggish kinetics of the underlaying reactions, oxygen evolution reaction (OER) and oxygen reduction reaction (ORR), and thus the required large observed overpotentials. Therefore, an efficient inexpensive catalyst is necessary. In the last decade, metal chalcogenides have

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Section: Introductionmentioning

confidence: 99%

Metal‐Rich Chalcogenides as Sustainable Electrocatalysts for Oxygen Evolution and Reduction: State of the Art and Future Perspectives

Amin

Apfel

2020

Eur J Inorg Chem

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“…The composite of Co 3 O 4 and Ag may achieve favorable bifunctional catalytic effects toward ORR and OER. Amin et al . reported that the mixture of Co 3 O 4 nanoparticles (50 nm, 99.5 %, Aldrich) and Ag nanoparticles (Ag 311) prepared by simple physical mixing can be used as an efficient bifunctional oxygen catalyst of Li–air batteries.…”

Section: Introductionmentioning

confidence: 99%

“…[13] Unfortunately,t he OER catalytic activityo fA gi sp articularly poor.T he composite of Co 3 O 4 andA gm ay achievef avorable bifunctional catalytic effects toward ORR and OER. Amin et al [14] reported that the mixture of Co 3 O 4 nanoparticles (50 nm, 99.5 %, Aldrich) and Ag nanoparticles (Ag 311) prepared by simple physical mixing can be used as an efficient bifunctionalo xygen catalyst of Li-air batteries. From the rotating-diske lectrode tests, the optimized composite of Co 3 O 4 /Ag showedamuch lower overpotential( % 320 mV) for ORR than pure Co 3 O 4 catalyst, and was verified to be af our-electron pathway.M eanwhile, the OER activity of the composite catalyst is about 1.5 times higher than the single Co 3 O 4 catalyst.…”

Section: Introductionmentioning

confidence: 99%

One‐Pot Synthesis of Co₃O₄/Ag Nanoparticles Supported on N‐Doped Graphene as Efficient Bifunctional Oxygen Catalysts for Flexible Rechargeable Zinc–Air Batteries

Wang

Miao

Sun

et al. 2018

Chemistry A European J

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Flexible rechargeable zinc–air batteries are considered as one of the most promising power supplies for the emerging flexible and wearable electronic devices. However, the development of flexible zinc–air batteries is stagnant due to the lack of efficient bifunctional catalysts with high oxygen catalytic activity and flexible solid‐state electrolytes with high mechanical stability and ionic conductivity. In this work, Co3O4/Ag@NrGO composite was synthesized by a facile one‐pot method, and the catalyst shows remarkable oxygen reduction reaction (ORR)/oxygen evolution reaction (OER) bifunctional catalytic activity and good long‐term stability. In particular, the OER overpotential of Co3O4/Ag@NrGO reaches 437 mV, outperforming that of the commercial IrO2 catalyst. This can be attributed to the combined effects of Co3O4, Ag, and N‐rGO. Furthermore, PAA (polyacrylic acid) and PVA (polyvinyl alcohol) based gel‐electrolytes have been developed as flexible solid‐state electrolytes for zinc–air batteries. The results show that PAA‐based electrolyte is more favorable to the flexible zinc–air battery with a high power density due to its relatively high ionic conductivity. The maximum power density of flexible zinc–air batteries with Co3O4/Ag@NrGO catalyst and PAA‐based electrolyte can reach 108 mW cm−2, which is almost the highest value reached in recent reports. This work will provide valuable guidance for the development of flexible rechargeable zinc–air batteries with high power density and stability.

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“…This transfer system allowed the transfer of a sample between the glovebox and the ultra‐high vacuum (UHV) chamber without contact to air. The XPS was part of a homemade UHV chamber with a base pressure of 5

\cdot

10 −10 mbar [24–26] . The X‐ray source was a non‐monochromatized Mg K α (1253.6 eV) source.…”

Section: Methodsmentioning

confidence: 99%

The Oxygen Reduction Reaction in Ca²⁺‐Containing DMSO: Reaction Mechanism, Electrode Surface Characterization, and Redox Mediation**

et al. 2020

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In this study we strengthen our fundamental understanding of the underlying reactions of a possible Ca-O2 battery using a DMSO based electrolyte. Employing the rotating ring disc electrode, we find a transition from a mixed process of O2and O2 2formation to an exclusive O2formation at gold electrodes. We will show that in this system Ca-superoxide and Ca-peroxide are formed as soluble species. However, there is a strongly adsorbed layer of ORR products on the electrode surface which is blocking the electrode. Surprisingly the blockade is a partial blockade because the formation of superoxide can be maintained. During an anodic sweep the ORR product layer is stripped from the electrode surface. With X-ray photoelectron spectroscopy the deposited ORR products are shown to be Ca(O2)2, CaO2 and CaO as well as side reaction products such as CO3 2and other oxygen containing carbon species. We will give evidences that the strongly attached layer on the electrocatalyst that is partially blocking the electrode could be adsorbed CaO. The disproportionation reaction of O2in presence of Ca 2+ was demonstrated via mass spectrometry. Finally the ORR mediated by 2,5-Di-tert-1,4-benzoquinone (DBBQ) is investigated by differential electrochemical mass spectrometry (DEMS) and XPS. Similar products as without DBBQ are deposited on the electrode surface. The analysis of the DEMS experiments shows that DBBQis reducing O2 to O2and O2 2whereas in the presence of DBBQ 2-O2 2is formed. The mechanism of the ORR with and without DBBQ will be discussed.

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A Carbon-Free Ag–Co3O4 Composite as a Bifunctional Catalyst for Oxygen Reduction and Evolution: Spectroscopic, Microscopic and Electrochemical Characterization

Cited by 39 publications

References 63 publications

Metal‐Rich Chalcogenides as Sustainable Electrocatalysts for Oxygen Evolution and Reduction: State of the Art and Future Perspectives

Metal‐Rich Chalcogenides as Sustainable Electrocatalysts for Oxygen Evolution and Reduction: State of the Art and Future Perspectives

One‐Pot Synthesis of Co₃O₄/Ag Nanoparticles Supported on N‐Doped Graphene as Efficient Bifunctional Oxygen Catalysts for Flexible Rechargeable Zinc–Air Batteries

The Oxygen Reduction Reaction in Ca²⁺‐Containing DMSO: Reaction Mechanism, Electrode Surface Characterization, and Redox Mediation**

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A Carbon-Free Ag–Co3O4 Composite as a Bifunctional Catalyst for Oxygen Reduction and Evolution: Spectroscopic, Microscopic and Electrochemical Characterization

Cited by 39 publications

References 63 publications

Metal‐Rich Chalcogenides as Sustainable Electrocatalysts for Oxygen Evolution and Reduction: State of the Art and Future Perspectives

Metal‐Rich Chalcogenides as Sustainable Electrocatalysts for Oxygen Evolution and Reduction: State of the Art and Future Perspectives

One‐Pot Synthesis of Co3O4/Ag Nanoparticles Supported on N‐Doped Graphene as Efficient Bifunctional Oxygen Catalysts for Flexible Rechargeable Zinc–Air Batteries

The Oxygen Reduction Reaction in Ca2+‐Containing DMSO: Reaction Mechanism, Electrode Surface Characterization, and Redox Mediation**

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Product

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One‐Pot Synthesis of Co₃O₄/Ag Nanoparticles Supported on N‐Doped Graphene as Efficient Bifunctional Oxygen Catalysts for Flexible Rechargeable Zinc–Air Batteries

The Oxygen Reduction Reaction in Ca²⁺‐Containing DMSO: Reaction Mechanism, Electrode Surface Characterization, and Redox Mediation**