Abstract: Colloidal catalysts for water oxidation 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 TEM data). Molecular mechanics and DLS studies indicate the 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 effective to oxidation of water with one electron oxidant Ru(bpy)33+ 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 TON are 7.8; 54 and 360, respectively. The Cu‐containing catalyst is poorly effective to water oxidation (the maximal yield is 28 % O2). The developed catalysts are of interest for kinetic studies of the mechanism of water oxidation using stopped‐flow technique and as precursors for anchoring nanosize hydroxides onto various supports in order to develop biomimetic systems for artificial photosynthesis.

Cite: Chikunov A.S. , Taran O.P. , Pyshnaya I.A. , Parmon V.N.
Colloidal FeIII, MnIII, CoIII and CuII Hydroxides Stabilized by Starch as Catalysts of Water Oxidation Reaction with One Electron Oxidant Ru(bpy)33+
ChemPhysChem. 2019. V.20. N3. P.410-421. DOI: 10.1002/cphc.201800957 WOS Scopus РИНЦ AN PMID OpenAlex

Files: Full text from publisher

Dates:

Submitted:	Oct 12, 2018
Accepted:	Dec 6, 2018
Published online:	Dec 6, 2018
Published print:	Feb 4, 2019

Identifiers:

Web of science:	WOS:000457714700010
Scopus:	2-s2.0-85059583212
Elibrary:	38700991
Chemical Abstracts:	2019:41225
PMID:	30520572
OpenAlex:	W2904586953

Citing:

DB	Citing
Scopus	4
Web of science	4
Elibrary	3
OpenAlex	3

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