Enhancing H₂ Evolution by Adjusting Oxygen Species at Perovskite SrTiO₃

Abstract

It is commonly believed that active oxygen species over ABO 3 perovskite play an important role in improving catalytic activity. In this paper, SrTiO 3 (STO) was prepared and doped with an extremely low concentration of NiP. By adjusting the doping process, the content of three kinds of oxygen species can be transformed accordingly, which consequently influences the catalytic activity in water splitting under visible light irradiation. The transformation of oxygen species and the improvement mechanism of hydrogen generation were investigated. X-ray absorption fine structure (XAFS), X-ray absorption spectroscopy (XAS), and density functional theory (DFT) calculation confirmed that Ni occupied the Ti sites and P coordinated with lattice oxygen on the STO surface. Structural evolution not only forms reactive lattice oxygen but also regulates oxygen vacancies and adsorbed oxygen. Reactive lattice oxygen serves as the reaction site during the hydrogen evolution reaction. In summary, constructing reactive lattice oxygen and adjusting the ratio of different oxygen species are effective ways to fabricate high-performance photocatalysts for H 2 evolution.

Favoring Product Desorption by a Tailored Electronic Environment of Oxygen Vacancies in SrTiO3 via Cr Doping for Enhanced and Selective Electrocatalytic CO2 to CO Conversion

“…The adsorption energy for reactants and intermediates is calculated using the following formula where E slab/mol , E slab , and E mol are the total energies of the slab with adsorbed molecules/intermediates, only slab, and only molecules, respectively. Similar computational methods and models have been used for previous computational studies exploring similar catalytic processes on the solid surfaces. ,− …”

Applications of X-ray Absorption Fine Structure Spectroscopy in the Photocatalytic Conversion of Small Molecules

“…Furthermore, the XAFS technique has been developed to observe the active sites in small-molecule conversion reactions, providing the benefit of understanding the structure–activity relationship . Qureshi et al systematically studied the relevance of the oxidation state and the overall water splitting activity of ultrafine Pt species.…”

“…73 Furthermore, the XAFS technique has been developed to observe the active sites in small-molecule conversion reactions, providing the benefit of understanding the structure−activity relationship. 74 Qureshi et al systematically studied the relevance of the oxidation state and the overall water splitting activity of ultrafine Pt species. The DFT and XAFS results indicated that the mixture of Pt single atoms and small clusters showed higher electronic metal−support interactions and exhibited a higher photocatalytic performance.…”

Synthesis, characterization, and performance assessment of a perovskite‐type nano photocatalyst for degradation of thiamethoxam

“…[10] Perovskite-type oxides, a third generation photocatalyst, [11,12] can be represented by the generalized formula ABO 3 . Perovskite-type oxides (ABO 3 ) have numerous uses in hydrogen evolution, [13][14][15] photocatalysis, [16][17][18] and gas sensor. [19] Lanthanum ferrite (LF), a perovskite with distinctive photophysical properties, is one of the most significant perovskite-type compounds and is ideal for a plethora of technological uses, including as a photocatalyst, in solidoxide fuel cells, in sensors, and also as a material for electrodes.…”

“…Perovskite‐type oxides, a third generation photocatalyst, [ 11,12 ] can be represented by the generalized formula ABO 3 . Perovskite‐type oxides (ABO 3 ) have numerous uses in hydrogen evolution, [ 13–15 ] photocatalysis, [ 16–18 ] and gas sensor. [ 19 ]…”