Polyoxometalate-assisted synthesis of amorphous zeolitic imidazolate for efficient electrocatalytic oxygen evolution

Zhao, Yupeng; Gao, Dandan; Biskupek, Johannes; Kaiser, Ute; Liu, Rongji; Streb, Carsten

doi:10.1016/j.rechem.2022.100568

Cited by 3 publications

(2 citation statements)

References 22 publications

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“…Previously studied POM combined with poly(vinyl butyl imidazolium) cations and cobalt ([PVIM][V-Co 4 ]) showed an η 10 of 430 mV in alkaline media, which is similar to the herein-obtained value for Fe-POM [30]. Ni-modified Keggin-type POM ([PNi(H 2 O)W 11 O 39 ] 5− ) prepared with the zeolitic imidazolate framework ZIF 67 (PNiW 11 @amZIF) and PW 12 @amZIF examined for OER in 1 M KOH showed an η 10 of 375 mV and 423 mV, respectively, which is somewhat lower/similar to the value obtained herein [31]. Cu-POM and Mn-POM did not reach a current density of 10 mA cm −2 within the studied potential range.…”

Section: Catalysis Of Oer Using Tm-pomssupporting

confidence: 89%

Transition Metal-Based Polyoxometalates for Oxygen Electrode Bifunctional Electrocatalysis

Milikić,

Gusmão,

Knežević

et al. 2024

Batteries

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Polyoxometalates (POMs) with transition metals (Co, Cu, Fe, Mn, Ni) of Keggin structure and lamellar-stacked multi-layer morphology were synthesized. They were subsequently explored as bifunctional electrocatalysts for oxygen electrodes, i.e., oxygen reduction (ORR) and evolution (OER) reaction, for aqueous rechargeable metal-air batteries in alkaline media. The lowest Tafel slope (85 mV dec−1) value and the highest OER current density of 93.8 mA cm−2 were obtained for the Fe-POM electrocatalyst. Similar OER electrochemical catalytic activity was noticed for the Co-POM electrocatalyst. This behavior was confirmed by electrochemical impedance spectroscopy, where Fe-POM gave the lowest charge transfer resistance of 3.35 Ω, followed by Co-POM with Rct of 15.04 Ω, during the OER. Additionally, Tafel slope values of 85 and 109 mV dec−1 were calculated for Fe-POM and Co-POM, respectively, during the ORR. The ORR at Fe-POM proceeded by mixed two- and four-electron pathways, while ORR at Co-POM proceeded exclusively by the four-electron pathway. Finally, capacitance studies were conducted on the synthesized POMs.

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Section: Catalysis Of Oer Using Tm-pomssupporting

confidence: 89%

Transition Metal-Based Polyoxometalates for Oxygen Electrode Bifunctional Electrocatalysis

Milikić,

Gusmão,

Knežević

et al. 2024

Batteries

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“…We assign this size reduction to the acid etching process, as similar changes have been observed previously. 31 The surface of the polyhedral shows some roughening which is not present in the pristine ZIF-67. The same morphological feature can be seen in the case of Composite 2 as well (Fig.…”

Section: Resultsmentioning

confidence: 97%

In situformation of robust nanostructured cobalt oxyhydroxide/cobalt oxide oxygen evolution reaction electrocatalysts

Zhao,

Gao,

Biskupek

et al. 2024

Mater. Adv.

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Fabrication and Electrocatalytic Evolution of Alkali-Free CoNb₂O₆ Thin Films for Water Oxidation via Polyoxoniobates

De,

Rambaran,

Ohlin

2024

ACS Appl. Energy Mater.

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Fabrication of CoNb 2 O 6 thin films was possible through spin-coating an alkali-free, aqueous solution of a polyoxoniobate ([Nb 10 O 28 ] 6− , Nb 10 ) and a cobalt nitrate (Co-(NO 3 ) 2 ), followed by annealing. The results showed that depending on the calcination conditions, minor phases of unreacted Co 3 O 4 and β-Nb 2 O 5 may form alongside the columbite CoNb 2 O 6 phase. However, optimizing the calcination conditions can lead to the formation of single-phase orthorhombic columbite CoNb 2 O 6 . The optimal annealing temperature was evaluated by analysis of the powders made from the same solution annealed at different temperatures. The calcination temperature has been determined to have a significant impact on the phase purity of the CoNb 2 O 6 . Furthermore, the powders and thin films exhibited superior catalytic activity and stability toward water oxidation, with a low overpotential and a high current density. Fabrication of these thin films by the use of simple aqueous solutions, rather than moisture-sensitive precursors (NbCl 5 or Nb(OC 2 H 5 ) 5 ) or energy-intensive methods (sputter deposition/laser ablation), fosters environmentally benign and sustainable options for various thin-film-based applications. This work provides a promising avenue for the development of efficient, green and noble-metal-free electrocatalyst thin films for water oxidation.

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Polyoxometalate-assisted synthesis of amorphous zeolitic imidazolate for efficient electrocatalytic oxygen evolution

Cited by 3 publications

References 22 publications

Transition Metal-Based Polyoxometalates for Oxygen Electrode Bifunctional Electrocatalysis

Transition Metal-Based Polyoxometalates for Oxygen Electrode Bifunctional Electrocatalysis

In situformation of robust nanostructured cobalt oxyhydroxide/cobalt oxide oxygen evolution reaction electrocatalysts

Fabrication and Electrocatalytic Evolution of Alkali-Free CoNb₂O₆ Thin Films for Water Oxidation via Polyoxoniobates

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Polyoxometalate-assisted synthesis of amorphous zeolitic imidazolate for efficient electrocatalytic oxygen evolution

Cited by 3 publications

References 22 publications

Transition Metal-Based Polyoxometalates for Oxygen Electrode Bifunctional Electrocatalysis

Transition Metal-Based Polyoxometalates for Oxygen Electrode Bifunctional Electrocatalysis

In situformation of robust nanostructured cobalt oxyhydroxide/cobalt oxide oxygen evolution reaction electrocatalysts

Fabrication and Electrocatalytic Evolution of Alkali-Free CoNb2O6 Thin Films for Water Oxidation via Polyoxoniobates

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Product

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Fabrication and Electrocatalytic Evolution of Alkali-Free CoNb₂O₆ Thin Films for Water Oxidation via Polyoxoniobates