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Unusual Photoactive Water Oxidation Activity of Pt/PtO x Cocatalyst Decorated Crystalline α‐Fe 2 O 3 Nanostructures: Exposed Facets Dependent Reactivity
Author(s) -
Patra Astam K.,
Amoli Vipin,
Sinha Anil K.,
Kim Dukjoon
Publication year - 2020
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201902070
Subject(s) - dodecahedron , nanorod , photocatalysis , octahedron , nanomaterials , water splitting , materials science , nanocrystal , reactivity (psychology) , nanostructure , nanotechnology , homo/lumo , chemical engineering , photochemistry , catalysis , chemistry , crystallography , crystal structure , molecule , organic chemistry , medicine , alternative medicine , pathology , engineering
A key challenge remains the preparation of an active and robust water oxidation photocatalyst with abundant earth materials. As a useful to improve photocatalytic efficiency, the development of α‐Fe 2 O 3 nanocrystals with different exposed facets and interfaces has attracted enormous attention. But literature survey shows that α‐Fe 2 O 3 nanomaterials were mainly used in photoelectrochemical cell for water splitting as anode materials. In this work, highly efficient Pt/PtO x cocatalyst decorated α‐Fe 2 O 3 shaped‐photocatalysts were derived as photocatalyst for white light‐induced O 2 generation from water without any electric potential. The maximum apparent quantum efficiency of photooxidation reaction was reached 55.33 % by Pt/PtO x decorated bitruncated‐dodecahedron shaped α‐Fe 2 O 3 and around 30.5, 2.3, 1.28 times better than the Pt/PtO x decorated nanocuboid, nanorod and bitruncated‐octahedron shape respectively. The Pt/PtO x decorated bitruncated‐dodecahedron shaped α‐Fe 2 O 3 display an unusual photooxidation activity with a high TOF (1.96×10 −2 s −1 ) due to presence of destabilized and unsaturated Fe centre containing high energy {104} and {100} facets. The present findings clearly demonstrate that the selective O 2 evolution from water can possible without any sacrificial agent.