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Cr 2 O 3 Nanoparticles on Ba 5 Ta 4 O 15 as a Noble‐Metal‐Free Oxygen Evolution Co‐Catalyst for Photocatalytic Overall Water Splitting
Author(s) -
Soldat Julia,
Busser G. Wilma,
Muhler Martin,
Wark Michael
Publication year - 2016
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.201500977
Subject(s) - water splitting , noble metal , catalysis , x ray photoelectron spectroscopy , photocatalysis , amorphous solid , materials science , nanoparticle , transition metal , inorganic chemistry , perovskite (structure) , transmission electron microscopy , metal , chemistry , crystallography , nanotechnology , chemical engineering , metallurgy , biochemistry , engineering
The (1 1 1)‐layered perovskite material Ba 5 Ta 4 O 15 represents a suitable photoabsorber with remarkable photocatalytic activity in overall water splitting. We are the first to demonstrate overall water splitting without the presence of a noble‐metal‐based co‐catalyst over this catalyst. The photocatalytic activity of Ba 5 Ta 4 O 15 was investigated by overall water splitting after reductive photodeposition of amorphous Cr 2 O 3 . The formation of Cr 2 O 3 nanoparticles for water splitting was evidenced by X‐ray photoelectron spectroscopy and transmission electron microscopy. The reductive photodeposition of very low amounts of Cr 2 O 3 on Ba 5 Ta 4 O 15 induces stable rates in overall water splitting up to 465 μmol h −1 H 2 and 228 μmol h −1 O 2 .
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