Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
Highly Active Visible Light-Promoted Ir/g-C3N4 Photocatalysts for the Water Oxidation Reaction Prepared from a Halogen-Free Iridium Precursor. / Topchiyan, Polina; Vasilchenko, Danila; Tkachev, Sergey и др.
в: ACS applied materials & interfaces, Том 14, № 31, 10.08.2022, стр. 35600-35612.Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
}
TY - JOUR
T1 - Highly Active Visible Light-Promoted Ir/g-C3N4 Photocatalysts for the Water Oxidation Reaction Prepared from a Halogen-Free Iridium Precursor
AU - Topchiyan, Polina
AU - Vasilchenko, Danila
AU - Tkachev, Sergey
AU - Sheven, Dmitriy
AU - Eltsov, Ilia
AU - Asanov, Igor
AU - Sidorenko, Nikolay
AU - Saraev, Andrey
AU - Gerasimov, Evgeny
AU - Kurenkova, Anna
AU - Kozlova, Ekaterina
N1 - Funding Information: This work was supported by the Russian Science Foundation (RSF grant 21-13-00314). The authors deeply thank XRD Facility of NIIC SB RAS for the single-crystal data collection, Dr. Plyusnin P.E for thermogravimetric analysis, and Yushina I.V. for DRS analysis. Publisher Copyright: © 2022 American Chemical Society.
PY - 2022/8/10
Y1 - 2022/8/10
N2 - A combination of the exceptional stability of fac-[Ir(H2O)3(NO2)3] together with thermolability of nitro and aqua ligands and high solubility in various solvents makes it promising as a brand-new chlorine-free precursor of iridium for the preparation of heterogeneous catalysts. In the current work, a new technique of fac-[Ir(H2O)3(NO2)3] preparation based on hydrothermal treatment of (NH4)3[Ir(NO2)6] was developed. For this purpose, the influence of reaction parameters such as the reaction time, temperature, and pH of the solution on the process of hexanitroiridate salt hydrolysis was investigated. The synthesized fac-[Ir(H2O)3(NO2)3] solution in this optimized way was used for the preparation of the series of Ir/g-C3N4 catalysts, which were evaluated in the water oxidation reaction with NaIO4 utilized as a sacrificial reagent. A 20-fold enhancement of the oxygen evolution reaction (OER) activity was found to take place under visible light (λ = 411 nm) illumination of the systems. The highest rate of the photoinduced OER per iridium center was achieved by the Ir0.005/g-C3N4 (air, 400°C) catalyst with an exceptional turnover frequency value of 967 min-1 approaching the activity of known homogeneous iridium OER catalysts. The leaching experiments have shown that aquated Ir species are generated in a solution after prolonged functioning of the catalysts. Despite this, in the closed system the photodriven OER activity persists at a steady-state level evidencing an equilibrium achieved between dissolved and anchored Ir species forming catalytic tandem with the g-C3N4.
AB - A combination of the exceptional stability of fac-[Ir(H2O)3(NO2)3] together with thermolability of nitro and aqua ligands and high solubility in various solvents makes it promising as a brand-new chlorine-free precursor of iridium for the preparation of heterogeneous catalysts. In the current work, a new technique of fac-[Ir(H2O)3(NO2)3] preparation based on hydrothermal treatment of (NH4)3[Ir(NO2)6] was developed. For this purpose, the influence of reaction parameters such as the reaction time, temperature, and pH of the solution on the process of hexanitroiridate salt hydrolysis was investigated. The synthesized fac-[Ir(H2O)3(NO2)3] solution in this optimized way was used for the preparation of the series of Ir/g-C3N4 catalysts, which were evaluated in the water oxidation reaction with NaIO4 utilized as a sacrificial reagent. A 20-fold enhancement of the oxygen evolution reaction (OER) activity was found to take place under visible light (λ = 411 nm) illumination of the systems. The highest rate of the photoinduced OER per iridium center was achieved by the Ir0.005/g-C3N4 (air, 400°C) catalyst with an exceptional turnover frequency value of 967 min-1 approaching the activity of known homogeneous iridium OER catalysts. The leaching experiments have shown that aquated Ir species are generated in a solution after prolonged functioning of the catalysts. Despite this, in the closed system the photodriven OER activity persists at a steady-state level evidencing an equilibrium achieved between dissolved and anchored Ir species forming catalytic tandem with the g-C3N4.
KW - g-C3N4
KW - iridium
KW - oxygen evolution reaction
KW - photocatalyst
KW - visible light
KW - g-C N
UR - http://www.scopus.com/inward/record.url?scp=85135768520&partnerID=8YFLogxK
U2 - 10.1021/acsami.2c07485
DO - 10.1021/acsami.2c07485
M3 - Article
C2 - 35881890
AN - SCOPUS:85135768520
VL - 14
SP - 35600
EP - 35612
JO - ACS applied materials & interfaces
JF - ACS applied materials & interfaces
SN - 1944-8244
IS - 31
ER -
ID: 36844139