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Popivker I, Meyerstein D, Gitin D, Avraham EN, Maimon E, Zidki T, Cohen H, Yardeni G, Moisy P, Pevzner S, Zilbermann I. Redox Properties of Ce IVDOTA in Carbonated Aqueous Solutions. A Radiolytic and an Electrochemical Study. J Phys Chem A 2021; 125:1436-1446. [PMID: 33566599 DOI: 10.1021/acs.jpca.0c09134] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The redox chemistry of CeIIIDOTA in cage in carbonate solutions was studied using electrochemistry and radiolysis techniques (continuous radiolysis and pulse radiolysis). Spectroscopic measurements point out that the species present in the solutions at high bicarbonate concentrations are [CeIIIDOTA(CO3)]3- (or less plausible [CeIIIDOTA(HCO3)]2-) with the carbonate (bicarbonate) anion as the ninth ligand versus [CeIIIDOTA(H2O)]- present in the absence of bicarbonate. Electrochemical results show a relatively low increase in the thermodynamic stabilization of the redox couple CeIV/III in the presence of carbonate versus its aqueous analogue. [CeIVDOTA(CO3)]2- and [CeIVDOTA(H2O)], prepared electrochemically, decompose photolytically. However, kept in the dark, both are relatively long lived; [CeIVDOTA(H2O)], though, is orders of magnitude kinetically more stable (a considerably longer half-life). Thus, one concludes that the carbonate species have a different mechanism of decomposition depending also on the presence of dioxygen after its preparation (in deaerated/aerated solutions). The [CeIVDOTA(CO3)]2- species is produced radiolytically by oxidation of the trivalent species by CO3•- with a rate constant, measured using pulse radiolysis, of 3.3 × 105 M-1 s-1. This rate constant is at least 1 order of magnitude smaller than most of the rate constants so far reported for the reaction of CO3•- with transition metal/lanthanide (cerium)/actinide complexes. This result together with the bulkiness of the reactants might suggest an outer-sphere electron transfer rather than the inner-sphere one so far proposed. The lifetime of the tetravalent cerium species obtained radiolytically in the presence of carbonate is shorter than the electrochemical one, suggesting a different conformer involved.
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Affiliation(s)
- Inna Popivker
- Chemistry Department, Nuclear Research Centre-Negev, P.O. Box 9001, Beer-Sheva 84190, Israel
| | - Dan Meyerstein
- Department of Chemical Sciences and the Schlesinger Family Center for Compact Accelerators, Radiation Sources and Applications, Ariel University, Ariel 40700, Israel.,Chemistry Department, Ben-Gurion University of the Negev, P.O. Box 653, Beer-Sheva 84170, Israel
| | - Dalia Gitin
- Department of Chemical Sciences and the Schlesinger Family Center for Compact Accelerators, Radiation Sources and Applications, Ariel University, Ariel 40700, Israel
| | - Elad N Avraham
- Chemistry Department, Nuclear Research Centre-Negev, P.O. Box 9001, Beer-Sheva 84190, Israel.,Chemistry Department, Ben-Gurion University of the Negev, P.O. Box 653, Beer-Sheva 84170, Israel
| | - Eric Maimon
- Chemistry Department, Nuclear Research Centre-Negev, P.O. Box 9001, Beer-Sheva 84190, Israel.,Chemistry Department, Ben-Gurion University of the Negev, P.O. Box 653, Beer-Sheva 84170, Israel
| | - Tomer Zidki
- Chemistry Department, Ben-Gurion University of the Negev, P.O. Box 653, Beer-Sheva 84170, Israel
| | - Haim Cohen
- Department of Chemical Sciences and the Schlesinger Family Center for Compact Accelerators, Radiation Sources and Applications, Ariel University, Ariel 40700, Israel.,Chemistry Department, Ben-Gurion University of the Negev, P.O. Box 653, Beer-Sheva 84170, Israel
| | - Guy Yardeni
- Chemistry Department, Nuclear Research Centre-Negev, P.O. Box 9001, Beer-Sheva 84190, Israel
| | - Philippe Moisy
- CEA, DES, ISEC, DMRC, University of Montpellier, 30207 Bagnols-sur-Cèze, Marcoule, France
| | - Svetlana Pevzner
- Chemistry Department, Nuclear Research Centre-Negev, P.O. Box 9001, Beer-Sheva 84190, Israel
| | - Israel Zilbermann
- Chemistry Department, Nuclear Research Centre-Negev, P.O. Box 9001, Beer-Sheva 84190, Israel.,Chemistry Department, Ben-Gurion University of the Negev, P.O. Box 653, Beer-Sheva 84170, Israel
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Talebi P, Singh H, Rani E, Huttula M, Cao W. Surface plasmon-driven photocatalytic activity of Ni@NiO/NiCO 3 core-shell nanostructures. RSC Adv 2021; 11:2733-2743. [PMID: 35424227 PMCID: PMC8693841 DOI: 10.1039/d0ra09666k] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2020] [Accepted: 01/05/2021] [Indexed: 12/16/2022] Open
Abstract
Ni@NiO/NiCO3 core-shell nanostructures have been investigated for surface plasmon driven photocatalytic solar H2 generation without any co-catalyst. Huge variation in the photocatalytic activity has been observed in the pristine vs. post-vacuum annealed samples with the maximum H2 yield (∼110 μmol g-1 h-1) for the vacuum annealed sample (N70-100/2 h) compared to ∼92 μmol g-1 h-1 for the pristine (N70) photocatalyst. Thorough structural (X-ray diffraction) and spectroscopic (X-ray photoelectron spectroscopy and transmission electron microscopy coupled electron energy loss spectroscopy) investigations reveal the core Ni nanoparticle decorated with the shell, a composite of crystalline NiO and amorphous NiCO3. Significant visible light absorption at ∼475 nm in the UV-vis region along with the absence of a peak/edge corresponding to NiO suggest the role of surface plasmons in the observed catalytic activity. As per the proposed mechanism, amorphous NiCO3 in the shell has been suggested to serve as the dielectric medium/interface, which enhances the surface plasmon resonance and boosts the HER activity.
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Affiliation(s)
- Parisa Talebi
- Nano and Molecular Systems Research Unit, University of Oulu FIN-90014 Finland
| | - Harishchandra Singh
- Nano and Molecular Systems Research Unit, University of Oulu FIN-90014 Finland
| | - Ekta Rani
- Nano and Molecular Systems Research Unit, University of Oulu FIN-90014 Finland
| | - Marko Huttula
- Nano and Molecular Systems Research Unit, University of Oulu FIN-90014 Finland
- School of Materials Science and Engineering, Henan University of Science and Technology Luoyang 471023 Henan China
| | - Wei Cao
- Nano and Molecular Systems Research Unit, University of Oulu FIN-90014 Finland
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Benkó T, Lukács D, Frey K, Németh M, Móricz MM, Liu D, Kováts É, May NV, Vayssieres L, Li M, Pap JS. Redox-inactive metal single-site molecular complexes: a new generation of electrocatalysts for oxygen evolution? Catal Sci Technol 2021. [DOI: 10.1039/d1cy01087e] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Bypassing the metal-based oxidation in a Cu-containing water oxidation catalytic system.
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Affiliation(s)
- Tímea Benkó
- Centre for Energy Research, Institute for Energy Security and Environmental Safety, Surface Chemistry and Catalysis Department, Konkoly-Thege street 29-33, 1121 Budapest, Hungary
| | - Dávid Lukács
- Centre for Energy Research, Institute for Energy Security and Environmental Safety, Surface Chemistry and Catalysis Department, Konkoly-Thege street 29-33, 1121 Budapest, Hungary
| | - Krisztina Frey
- Centre for Energy Research, Institute for Energy Security and Environmental Safety, Surface Chemistry and Catalysis Department, Konkoly-Thege street 29-33, 1121 Budapest, Hungary
| | - Miklós Németh
- Centre for Energy Research, Institute for Energy Security and Environmental Safety, Surface Chemistry and Catalysis Department, Konkoly-Thege street 29-33, 1121 Budapest, Hungary
| | - Márta M. Móricz
- Centre for Energy Research, Institute for Energy Security and Environmental Safety, Surface Chemistry and Catalysis Department, Konkoly-Thege street 29-33, 1121 Budapest, Hungary
| | - Dongyu Liu
- International Research Center for Renewable Energy (IRCRE), State Key Laboratory of Multiphase Flow in Power Engineering (MFPE), Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China
| | - Éva Kováts
- Institute for Solid State Physics and Optics, Wigner Research Centre for Physics, P.O. Box 49, H-1525 Budapest, Hungary
| | - Nóra V. May
- Centre for Structural Science, Research Centre for Natural Sciences, Magyar tudósok körútja 2, H-1117, Budapest, Hungary
| | - Lionel Vayssieres
- International Research Center for Renewable Energy (IRCRE), State Key Laboratory of Multiphase Flow in Power Engineering (MFPE), Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China
| | - Mingtao Li
- International Research Center for Renewable Energy (IRCRE), State Key Laboratory of Multiphase Flow in Power Engineering (MFPE), Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China
| | - József S. Pap
- Centre for Energy Research, Institute for Energy Security and Environmental Safety, Surface Chemistry and Catalysis Department, Konkoly-Thege street 29-33, 1121 Budapest, Hungary
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