Thermally-induced arrangement of cobalt and iron in the ZIF-derived Fe,Co,Zn-N/C catalysts for the oxygen reduction reaction

Lastovina, T. A.; Budnyk, Andriy P.; Pimonova, Yulia; Bugaev, Aram L.; Dmitriev, Vladimir

doi:10.1016/j.ijhydene.2019.07.022

Cited by 20 publications

(15 citation statements)

References 62 publications

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“…30 Such peculiarities have been already observed by our group in a similar system but having a substantially higher cobalt content. 27 However, in the present case, CNTs appear shorter and thinner than those observed previously. The distinction might be ascribed to the difference in the NP’s composition since the type of metal and the size of the NPs are known to influence the tube’s length and diameter.…”

Section: Resultscontrasting

confidence: 63%

“…6,13 These maps present the picture resembling that has been already observed for a similar system in our earlier reports. 27…”

Section: Resultsmentioning

confidence: 99%

“…Our recent X-ray absorption spectroscopy studies on a similar system (but with a higher Co content) also showed that Fe was in Fe 0 state and preferentially located at the surface of mixed Fe–Co NPs, without any evidence of pure Fe NPs. 27…”

Section: Resultsmentioning

confidence: 99%

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Iron-/Nitrogen-Doped Electrocatalytically Active Carbons for the Oxygen Reduction Reaction with Low Amounts of Cobalt

Pimonova¹,

Budnyk

Yohannes

et al. 2019

ACS Omega

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Transition-metal-doped carbon catalysts are promising Pt-free alternatives for low-temperature fuel cells. They are frequently obtained from sacrificial N-rich zeolitic imidazolate frameworks (ZIFs) doped with Co and Fe. The optimal low loading of metals has to be achieved to guarantee the competitive efficiency and facilitate an inquiry into the mechanism of their catalytic activity. We report on microwave-assisted solvothermal synthesis of Zn,Co-ZIFs with a relatively low (1–15 mol %) Co loading, which were further enriched with Fe(II). Materials were pyrolyzed at 700 °C to form catalytically active carbons bearing metal nanoparticles confined in structured carbon. The electrochemistry test of carbons for the oxygen reduction reaction (ORR) in perchloric acid demonstrated their high efficiency even at low cobalt contents. The initial loading of 10 mol % was found efficient, leading to the production of catalytically active carbons allowing for four-electron path of ORR.

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Section: Resultscontrasting

confidence: 63%

“…6,13 These maps present the picture resembling that has been already observed for a similar system in our earlier reports. 27…”

Section: Resultsmentioning

confidence: 99%

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Iron-/Nitrogen-Doped Electrocatalytically Active Carbons for the Oxygen Reduction Reaction with Low Amounts of Cobalt

Pimonova¹,

Budnyk

Yohannes

et al. 2019

ACS Omega

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“…To better understand the material transformation during inert pyrolysis, Lastovina et al. [ 93 ] carried out in situ X‐ray absorption spectroscopy and observed the coordinated Co(II) sites in Co/Zn‐ZIF were transformed into Co(I) intermediates within 200–500 °C and into metallic forms at 500 °C. If Fe‐phenanthroline was added in Co/Zn‐ZIF, the Fe(III) species were transformed to FeO within 200–400 °C and then to Fe 0 (alloying with Co) at 500 °C.…”

Section: Pyrolyzed Zeolitic‐imidazolate Framework (Zif) For Oxygen Electrocatalysismentioning

confidence: 99%

Metal–Organic Frameworks and Metal–Organic Gels for Oxygen Electrocatalysis: Structural and Compositional Considerations

2021

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Increasing demand for sustainable and clean energy is calling for the next‐generation energy conversion and storage technologies such as fuel cells, water electrolyzers, CO2/N2 reduction electrolyzers, metal–air batteries, etc. All these electrochemical processes involve oxygen electrocatalysis. Boosting the intrinsic activity and the active‐site density through rational design of metal–organic frameworks (MOFs) and metal–organic gels (MOGs) as precursors represents a new approach toward improving oxygen electrocatalysis efficiency. MOFs/MOGs afford a broad selection of combinations between metal nodes and organic linkers and are known to produce electrocatalysts with high surface areas, variable porosity, and excellent activity after pyrolysis. Some recent studies on MOFs/MOGs for oxygen electrocatalysis and their new perspectives in synthesis, characterization, and performance are discussed. New insights on the structural and compositional design in MOF/MOG‐derived oxygen electrocatalysts are summarized. Critical challenges and future research directions are also outlined.

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“…Metal–organic frameworks (MOFs) are crystalline porous materials composed of inorganic secondary building units (SBUs) connected by polyfunctional organic ligands (linkers). , The ligands act as spacers, creating an open porous three-dimensional structure, with high pore volume and surface area. This hybrid architecture opens the possibility of designing a great variety of new porous materials for applications in gas storage and separation, catalysis, medicine, and other fields. − …”

Section: Introductionmentioning

confidence: 99%

Experimental and Theoretical Investigation of Ethylene and 1-MCP Binding Sites in HKUST-1 Metal–Organic Framework

et al. 2021

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Selective binding of ethylene and ethylene action inhibitor in nanoporous materials can provide new strategies for harvest preservation technologies. In this work, we investigate the process of ethylene and 1-methylcyclopropene (1-MCP), also known as ethylene action inhibitor, binding on HKUST-1, a metal–organic framework (MOF) with open copper sites. For the first time, in situ infrared spectroscopy combined with theoretical simulations was used to obtain the three-dimensional structure of ethylene and 1-MCP bound to Cu-sites of HKUST-1. Time-resolved infrared spectra were collected to selectively determine the rates of ethylene desorption from Cu-sites and estimate its binding energies which were also compared with theoretical results. Not only a successful investigation of ethylene binding sites in HKUST-1 is presented but also a methodology that can be extended to study ethylene/1-MCP storage and release in porous materials with open metal sites which is relevant to the harvest preservation technology.

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Thermally-induced arrangement of cobalt and iron in the ZIF-derived Fe,Co,Zn-N/C catalysts for the oxygen reduction reaction

Cited by 20 publications

References 62 publications

Iron-/Nitrogen-Doped Electrocatalytically Active Carbons for the Oxygen Reduction Reaction with Low Amounts of Cobalt

Iron-/Nitrogen-Doped Electrocatalytically Active Carbons for the Oxygen Reduction Reaction with Low Amounts of Cobalt

Metal–Organic Frameworks and Metal–Organic Gels for Oxygen Electrocatalysis: Structural and Compositional Considerations

Experimental and Theoretical Investigation of Ethylene and 1-MCP Binding Sites in HKUST-1 Metal–Organic Framework

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