Abstract
In this contribution, new SrTiO3-based materials have been developed and their catalytic and electrocatalytic properties have been tuned by cation insertion, nanocomposition, and infiltration. The aim is to develop highly functional materials within a critical raw material-free approach with a particular aim toward durability and stability [under operating conditions of solid oxide fuel cell (SOFC) anodes] and activity toward biogas. We started from a sustainable and durable perovskite, SrTiO3, with the aim of implementing performances with insertion of Ba and Mo into the crystalline cell. The catalysts are BaxSr1–xTi1–yMoyO3, with x = 0 and 0.5 and y = 0, 0.1, and 0.4. Water-based wet chemistry procedures were developed specifically for each compound to obtain high purity and control barium and molybdenum insertion into the perovskite lattice. This result has been successfully obtained by means of a detailed characterization (X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy, energy-dispersive X-ray spectroscopy, temperature-programmed desorption, temperature-programmed reduction, and BrunauerEmmettTeller) carried out during each preparation steps. We demonstrated that catalytic (methane dry reforming and CO oxidation is obtained with SrTi0.9Mo0.1O3) and electrocatalytic (of SrTi0.6Mo0.4O3 as the anode in SOFCs) activities can be developed starting from an economic, sustainable, and robust material. Activity enhancement was obtained with nickel nanodeposition (wet impregnation and infiltration).
Highlights
Several materials exhibit high catalytic and electrocatalytic performances, mainly due to the presence of noble metals
We demonstrated that catalytic and electrocatalytic activities can be developed starting from an economic, sustainable, and robust material
The target of our work is to demonstrate good catalytic activity in CO oxidation and in methane dry reforming (MDR) and the possibility to evaluate doped titanates as anodes in solid oxide fuel cell (SOFC) adding the capability to operate with C-containing fuels
Summary
Several materials exhibit high catalytic and electrocatalytic performances, mainly due to the presence of noble metals. We expect catalytic and electrocatalytic activity to be enhanced by inserting Mo in the B-site because of the capability of this element to create redox couples.[4−9] Mo stable oxidation state is (VI), but in a II−IV perovskite, the Mo(IV) has to prevail, so a redox couple Mo(IV)/Mo(VI) is forced. This oxidation state transition implies passage through Mo(V) which induces the formation of electronic states inside the band gap capable of contributing to redox catalysis mechanisms
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