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Krivenko AG, Manzhos RA, Komarova NS, Kotkin AS, Kabachkov EN, Shul’ga YM. Comparative Study of Graphite and the Products of Its Electrochemical Exfoliation. RUSS J ELECTROCHEM+ 2019. [DOI: 10.1134/s1023193518110058] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Podyacheva OY, Bulushev DA, Suboch AN, Svintsitskiy DA, Lisitsyn AS, Modin E, Chuvilin A, Gerasimov EY, Sobolev VI, Parmon VN. Highly Stable Single-Atom Catalyst with Ionic Pd Active Sites Supported on N-Doped Carbon Nanotubes for Formic Acid Decomposition. CHEMSUSCHEM 2018; 11:3724-3727. [PMID: 30175551 DOI: 10.1002/cssc.201801679] [Citation(s) in RCA: 48] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/24/2018] [Revised: 08/17/2018] [Indexed: 06/08/2023]
Abstract
Single-atom catalysts with ionic Pd active sites supported on nitrogen-doped carbon nanotubes have been synthesized with a palladium content of 0.2-0.5 wt %. The Pd sites exhibited unexpectedly high stability up to 500 °C in a hydrogen atmosphere which was explained by coordination of the Pd ions by nitrogen-containing fragments of graphene layers. The active sites showed a high rate of gas-phase formic acid decomposition yielding hydrogen. An increase in Pd content was accompanied by the formation of metallic nanoparticles with a size of 1.2-1.4 nm and by a decrease in the catalytic activity. The high stability of the single-atom Pd sites opens possibilities for using such catalysts in high-temperature reactions.
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Affiliation(s)
- Olga Y Podyacheva
- Boreskov Institute of Catalysis SB RAS, Pr. Lavrentieva, 5, Novosibirsk, 630090, Russia
- Novosibirsk State University, Pirogova 2, Novosibirsk, 630090, Russia
| | - Dmitri A Bulushev
- Boreskov Institute of Catalysis SB RAS, Pr. Lavrentieva, 5, Novosibirsk, 630090, Russia
- Novosibirsk State University, Pirogova 2, Novosibirsk, 630090, Russia
| | - Arina N Suboch
- Boreskov Institute of Catalysis SB RAS, Pr. Lavrentieva, 5, Novosibirsk, 630090, Russia
| | - Dmitry A Svintsitskiy
- Boreskov Institute of Catalysis SB RAS, Pr. Lavrentieva, 5, Novosibirsk, 630090, Russia
- Novosibirsk State University, Pirogova 2, Novosibirsk, 630090, Russia
| | - Alexander S Lisitsyn
- Boreskov Institute of Catalysis SB RAS, Pr. Lavrentieva, 5, Novosibirsk, 630090, Russia
| | - Evgeny Modin
- CIC nanoGUNE, Donostia-San Sebastian, 20018, Spain
| | - Andrey Chuvilin
- CIC nanoGUNE, Donostia-San Sebastian, 20018, Spain
- Ikerbasque, Basque Foundation for Science, Bilbao, 48013, Spain
| | - Evgeny Y Gerasimov
- Boreskov Institute of Catalysis SB RAS, Pr. Lavrentieva, 5, Novosibirsk, 630090, Russia
- Novosibirsk State University, Pirogova 2, Novosibirsk, 630090, Russia
| | - Vladimir I Sobolev
- Boreskov Institute of Catalysis SB RAS, Pr. Lavrentieva, 5, Novosibirsk, 630090, Russia
| | - Valentin N Parmon
- Boreskov Institute of Catalysis SB RAS, Pr. Lavrentieva, 5, Novosibirsk, 630090, Russia
- Novosibirsk State University, Pirogova 2, Novosibirsk, 630090, Russia
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Krivenko AG, Komarova NS, Stenina EV, Sviridova LN, Mironovich KV, Shul’ga YM, Manzhos RA, Doronin SV, Krivchenko VA. Electrochemical modification of electrodes based on highly oriented carbon nanowalls. RUSS J ELECTROCHEM+ 2015. [DOI: 10.1134/s1023193515100079] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Komarova NS, Krivenko AG, Stenina EV, Sviridova LN, Mironovich KV, Shulga YM, Krivchenko VA. Enhancement of the Carbon Nanowall Film Capacitance. Electron Transfer Kinetics on Functionalized Surfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:7129-7137. [PMID: 26043143 DOI: 10.1021/acs.langmuir.5b00391] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The effects of electrochemical oxidation and surfactant adsorption on behavior of vertically oriented carbon-nanowall (CNW)-based electrodes are studied. Electrochemical oxidation is carried out by the electrode polarization in aqueous solutions at high anodic potentials corresponding to water electrolysis, whereas the modification of surface by surfactants is accomplished by the adsorption of molecules characterized by the cage-like structure. Using the methods of cyclic voltammetry and impedancemetry, it is shown that a substantial increase in the capacitance of CNW-based electrodes is observed in both cases (30-50-fold and 3-5-fold, respectively). The as-grown and modified electrodes are characterized by scanning electron microscopy, Raman spectroscopy, and X-ray photoelectron spectroscopy. A substantial increase in a number of oxygen-containing functional groups is observed on the CNW surface after the electrode polarization at high anodic potentials. The kinetics of redox reactions on the CNW film surface is studied by comparing the behavior of systems [Ru(NH3)6](2+/3+), [Fe(CN)6](4-/3-), Fe(2+/3+), and VO3(-)/VO(2+). It is demonstrated that oxidation of nanowalls makes the electron transfer in the redox reaction VO3(-)/VO(2+) and the redox system Fe(2+/3+) considerably easier due to coordination of discharging ions of these systems with the functional groups; however, no such effect is observed for the redox-systems [Fe(CN)6](3-/4-) and [Ru(NH3)6](2+/3+).
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Affiliation(s)
- Natal'ya S Komarova
- †Institute of Problems of Chemical Physics RAS, Academician Semenov Avenue 1, Chernogolovka, Moscow Region 142432, Russia
| | - Alexander G Krivenko
- †Institute of Problems of Chemical Physics RAS, Academician Semenov Avenue 1, Chernogolovka, Moscow Region 142432, Russia
| | - Elena V Stenina
- ‡Chemistry Department, M.V. Lomonosov Moscow State University, Moscow 119991, Russia
| | - Liana N Sviridova
- ‡Chemistry Department, M.V. Lomonosov Moscow State University, Moscow 119991, Russia
| | - Kirill V Mironovich
- §D.V. Skobeltsyn Institute of Nuclear Physics, M.V. Lomonosov Moscow State University, Moscow 119991, Russia
| | - Yuri M Shulga
- †Institute of Problems of Chemical Physics RAS, Academician Semenov Avenue 1, Chernogolovka, Moscow Region 142432, Russia
| | - Victor A Krivchenko
- §D.V. Skobeltsyn Institute of Nuclear Physics, M.V. Lomonosov Moscow State University, Moscow 119991, Russia
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