Cr₂O₃ Nanoparticles on Ba₅Ta₄O₁₅ as a Noble‐Metal‐Free Oxygen Evolution Co‐Catalyst for Photocatalytic Overall Water Splitting

Abstract

The (1 1 1)‐layered perovskite material Ba5Ta4O15 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 Ba5Ta4O15 was investigated by overall water splitting after reductive photodeposition of amorphous Cr2O3. The formation of Cr2O3 nanoparticles for water splitting was evidenced by X‐ray photoelectron spectroscopy and transmission electron microscopy. The reductive photodeposition of very low amounts of Cr2O3 on Ba5Ta4O15 induces stable rates in overall water splitting up to 465 μmol h−1 H2 and 228 μmol h−1 O2.

2D Oxide Nanomaterials to Address the Energy Transition and Catalysis

“…Various layered perovskite photocatalysts have been reported to show interesting behavior in H 2 photoproduction. SrBi 2 Nb 2 O 9 was indicated as the most active of a series of Abi 2 Nb 2 O 9 samples, where A = Ca, Sr, Ba, by Li et al A Bi 5 Ti 3 FeO 15 layered perovskite exhibiting an Aurivillius phase was indicated as preferable under visible light by Jang et al Protonated layered perovskite oxides H 1.9 K 0.3 La 0.5 Bi 0.1 Ta 2 O 7 , H 1.6 K 0.2 La 0.3 Bi 0.1 Nb 2 O 6.5 and H‐Abi 2 Ta 2 O 9 (A = Ca, Sr, Ba, K 0.5 La 0.5 ) were indicated by Chen et al, while Soldat et al analyzed the properties of Cr 2 O 3 nanoparticles deposited on (111)‐layered perovskite Ba 5 Ta 4 O 15 for photocatalytic water splitting. Domen and co‐workers, who were among the first to remark upon the properties of layered perovskite type materials for water splitting, put attention more recently into a new layered perovskite (CsBa 2 Ta 3 O 10 ) and its conversion to nitrided Ba 2 Ta 3 O 10 nanosheets.…”

Complex Nanomaterials in Catalysis for Chemically Significant Applications: From Synthesis and Hydrocarbon Processing to Renewable Energy Applications

“…ABX 3 is the chemical formula for perovskites, where the cations are A and B; X, an anion which bonds to both A and B. e layered structure lowers electron-hole recombination and hence plays an important role in controlling the activity of water splitting, along with factors like cation valency and layer thickness. For photocatalytic water splitting [257], Busser et al investigated the characteristics of Cr 2 O 3 nanoparticles placed on (111)-layered perovskite Ba 5 Ta 4 O 15 .…”

Suppression of phosphine-protected Au9 cluster agglomeration on SrTiO3 particles using a chromium hydroxide layer

“…Domen et al have developed a method to improve the stability of rhodium nanoparticles using a CrO x overlayer [25][26][27][28] . CrO x overlayers also can prevent the back reaction H + and O 2 to H 2 O (oxygen photoreduction reaction) in photocatalysts used for water splitting [29][30][31][32][33][34][35][36][37][38] , with the effectiveness of the overlayer depending on its thickness 39 . CrO x layers have been applied to a range of co-catalysts deposited on other metal oxide substrates, such as platinum nanoparticles 38,40 , palladium nanoparticles 41 , silver nanoparticles 39 and metal oxides (NiO x , RuO 2 , Rh 2 O 3 and CuO x ) 28,42 .…”