Сибирский федеральный университет

Тип публикации: статья из журнала

Год издания: 2019

Идентификатор DOI: 10.1002/cphc.201800957

Ключевые слова: catalytic activity, one-electron oxidants, oxygen evolution reaction, transition metal hydroxides, water splitting

Аннотация: Colloidal catalysts for oxidation of water to dioxygen, which are stable on storage and under the reaction conditions, are synthesized based on CoIII, MnIII, FeIII and CuII hydroxides. Stabilization of the colloids with dextrated starch allows the process of hydroxide ageing to be stopped at the stage of the formation of primary nuclei (ca. 2–3 nm from transmission electron microscopy data). Molecular mechanics and dynamic light scattering studies indicate a core-shell type structure of the catalysts, where the hydroxide core is stabilized by the molecular starch network (ca. 5–7 nm). The colloidal catalysts are highly efficient in oxidizing water with one electron oxidant Ru(bpy)3 3+ at pH 7 to 10. The influence of pH, catalyst concentration, and buffer nature on the oxygen yield is studied. The maximal yields are 72, 53, and 78 % over Fe-, Mn- and Co-containing catalysts, respectively, and turnover numbers are 7.8; 54 and 360, respectively. The Cu-containing catalyst is poorly effective to the water oxidation (the maximal yield is 28 % O2). The synthesized catalysts are of interest for stopped-flow kinetic studies of the mechanism of the water oxidation and as precursors for anchoring nanosized hydroxides onto various supports in order to develop biomimetic systems for artificial photosynthesis. © 2019 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim

Журнал: ChemPhysChem

Выпуск журнала: Vol. 20, Is. 3

Номера страниц: 410-421

ISSN журнала: 14394235

Издатель: Wiley-VCH Verlag

• Chikunov Andrei S. (RAS, BIC, SB, Lavrentieva Ave 5, Novosibirsk 630090, Russia)
• Taran Oxana P. (RAS, BIC, SB, Lavrentieva Ave 5, Novosibirsk 630090, Russia; RAS, SB, ICCT, Akademgorodok St 50-24, Krasnoyarsk 660036, Russia; Siberian Fed Univ, Svobodny Ave 79, Krasnoyarsk 660041, Russia)
• Pyshnaya Inna A. (RAS, SB, ICBFM, Lavrentieva Ave 8, Novosibirsk 630090, RussiaArticle)
• Parmon Valentin N. (RAS, BIC, SB, Lavrentieva Ave 5, Novosibirsk 630090, Russia)

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