Sulfuric Acid Solutions of [Pt(OH)4(H2O)2]: A Platinum Speciation Survey and Hydrated Pt(IV) Oxide Formation for Practical Use Full article
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Inorganic Chemistry
ISSN: 0020-1669 , E-ISSN: 1520-510X |
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| Output data | Year: 2022, Volume: 61, Number: 25, Pages: 9667–9684 Pages count : 18 DOI: 10.1021/acs.inorgchem.2c01134 | ||||||
| Tags | Catalysts; Coordination reactions; Single crystals; Sulfuric acid | ||||||
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| Affiliations |
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Funding (1)
| 1 | Russian Science Foundation | 21-73-10038 (121071400043-3) |
Abstract:
The systematic study of the platinum speciation in sulfuric acid solutions of platinum (IV) hydroxide {[Pt(OH)4(H2O)2], HHPA} was performed with the use of a combination of methods. Depending on the prevailing Pt form, the three regions of H2SO4 concentration were marked: (1) up to 3 M H2SO4 forms unstable solutions gradually generating the PtO2·xH2O particles; (2) 4–12 M H2SO4, where the series of mononuclear aqua–sulfato complexes ([Pt(SO4)n(H2O)6–n]4–2n, where n = 0···4) dominate; and (3) 12 M and above, where, along with [Pt(SO4)n(H2O)6–n]4–2n species, the polynuclear Pt(IV) species and complexes with a bidentate coordination mode of the sulfato ligand are formed. For the first time, the salts of the aqua–hydroxo Pt(IV) cation [Pt(OH)2(H2O)4]SO4 (triclinic and monoclinic phases) were isolated and studied with a combination of methods, including the single-crystal X-ray diffraction. The formation of PtO2·xH2O particles in sulfuric acid solutions (1–3 M) of HHPA and their spectral characteristics and morphology were studied. The deposition of PtO2·xH2O was highlighted as a convenient method to prepare various Pt-containing heterogeneous catalysts. This possibility was illustrated by the preparation of Pt/g-C3N4 catalysts, which show an excellent performance in catalytic H2 generation under visible light irradiation with a quantum efficiency up to 5% and a rate of H2 evolution up to 6.2 mol·h–1 per gram of loaded platinum.
Cite:
Vasilchenko D.
, Tkachenko P.
, Tkachev S.
, Popovetskiy P.
, Komarov V.
, Asanova T.
, Asanov I.
, Filatov E.
, Maximovskiy E.
, Gerasimov E.
, Zhurenok A.
, Kozlova E.
Sulfuric Acid Solutions of [Pt(OH)4(H2O)2]: A Platinum Speciation Survey and Hydrated Pt(IV) Oxide Formation for Practical Use
Inorganic Chemistry. 2022. V.61. N25. P.9667–9684. DOI: 10.1021/acs.inorgchem.2c01134 WOS Scopus РИНЦ AN PMID OpenAlex
Sulfuric Acid Solutions of [Pt(OH)4(H2O)2]: A Platinum Speciation Survey and Hydrated Pt(IV) Oxide Formation for Practical Use
Inorganic Chemistry. 2022. V.61. N25. P.9667–9684. DOI: 10.1021/acs.inorgchem.2c01134 WOS Scopus РИНЦ AN PMID OpenAlex
Dates:
| Submitted: | Apr 4, 2022 |
| Published online: | Jun 14, 2022 |
| Published print: | Jun 27, 2022 |
Identifiers:
| Web of science: | WOS:000819958500001 |
| Scopus: | 2-s2.0-85132950056 |
| Elibrary: | 49150362 |
| Chemical Abstracts: | 2022:1514401 |
| PMID: | 35700060 |
| OpenAlex: | W4282827675 |