Colloidal FeIII, MnIII, CoIII and CuII Hydroxides Stabilized by Starch as Catalysts of Water Oxidation Reaction with One Electron Oxidant Ru(bpy)33+
Full article
| Общее |
Language:
Английский,
Genre:
Full article,
Status:
Published,
Source type:
Original
|
| Journal |
ChemPhysChem
ISSN: 1439-4235
, E-ISSN: 1439-7641
|
| Output data |
Year: 2019,
Volume: 20,
Number: 3,
Pages: 410-421
Pages count
: 12
DOI:
10.1002/cphc.201800957
|
| Tags |
water splitting; one-electron oxidants; transition metal hydroxides; catalytic activity; oxygen evolution reaction |
| Authors |
Chikunov Andrei S.
1
,
Taran Oxana P.
1,2,3
,
Pyshnaya Inna A.
4
,
Parmon Valentin N.
1
|
| Affiliations |
| 1 |
Boreskov Institute of Catalysis (BIC SB RAS) 630090, Novosibirsk, Lavrentieva ave. 5 (Russian Federation)
|
| 2 |
Institute of Chemistry and Chemical Technilogy SB RAS (ICCT SB RAS) 660036, Krasnoyarsk, Akademgorodok st. 50-24 (Russian Federation)
|
| 3 |
Siberian Federal University 660041, Krasnoyarsk, Svobodny ave. 79 (Russian Federation)
|
| 4 |
Institute of Chemical Biology and Fundamental Medicine SB RAS (ICBFM SB RAS)
|
|
Funding (3)
|
1
|
Federal Agency for Scientific Organizations
|
0303-2016-0012 (V.47.1.4.)
|
|
2
|
Russian Foundation for Basic Research
|
15-29-01275
|
|
3
|
Federal Agency for Scientific Organizations
|
0356-2016-0503
|
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.