Photocatalytic hydrogen evolution over Pt–Pd dual atom sites anchored on TiO₂ nanosheets

Abstract

Photocatalytic hydrogen production from water is a clean and sustainable way of energy regeneration. Single-atom catalysts (SACs) have received increasing attention in the field of photocatalysis due to their high...

Alteration of Hydrodeoxygenation Pathways of Ni/TiO2-A Catalyst through Controlled Regulation of Strong Metal–Support Interactions and Surface Acidity

“…In addition, the stabilizing effect of Ba on O 2c also inhibits the formation of oxygen vacancies and may serve as a path "blocker" that hinders the migration of Ni on the TiO 2 -A surface, thereby inhibiting the formation of atomically dispersed Ni δ− (fixed by oxygen vacancies). 15,66 Furthermore, these Ba species apparently also occupy some sites that can bond with Ni 2+ species, thus partially inhibiting the formation of difficultly reducible Ni 2+ species, which is consistent with the increase in the reducibility of Ni 2+ caused by Ba ion modification in the XPS results (Table 3). The effect of the reduction temperature on the Ni−Ba/ TiO 2 -A catalysts was further investigated because higher reduction temperatures were reported to help improve the strength of the SMSI effect.…”

“…As a result, a large amount of Ti–O sites on the TiO 2 surface are still reducible at low Ba concentrations, as demonstrated by the large amount of Ti (4+δ)+ species in the XPS results (Table ), but the migration of Ti and O species is significantly inhibited. In addition, the stabilizing effect of Ba on O 2c also inhibits the formation of oxygen vacancies and may serve as a path “blocker” that hinders the migration of Ni on the TiO 2 -A surface, thereby inhibiting the formation of atomically dispersed Ni δ− (fixed by oxygen vacancies). , Furthermore, these Ba species apparently also occupy some sites that can bond with Ni 2+ species, thus partially inhibiting the formation of difficultly reducible Ni 2+ species, which is consistent with the increase in the reducibility of Ni 2+ caused by Ba ion modification in the XPS results (Table ).…”

Hierarchical hollow TiO2/In2S3 heterojunction photocatalyst decorated with spatially separated dual co-catalysts for enhanced photocatalytic H2 evolution

“…3c), two characteristic peaks of Pt/TO/IS/PdS centered at 452.1 eV and 444.5 eV are attributed to In 3d 3/2 and In 3d 5/2 of In 3+ , respectively. 45 Compared to TO/IS without co-catalyst loading, In 3d peaks shift to the lower binding energy in Pt/TO/IS/PdS. The Ti 2p XPS spectrum of Pt/TO/IS/PdS (Fig.…”

Single-Atom Pd Supported on TiO2 for the Photocatalytic Production of Hydrogen

“…In the O 1s spectrum of pure TiO 2 (Figure c), the characteristic peaks located at 529.84, 531.32, and 532.13 eV exhibit negative shifts of 0.28, 0.26, and 0.24 eV, respectively, in the O 1s spectrum of 0.125 wt % Pd–TiO 2 . As shown in the Pd 3d spectrum (Figure d), the peaks at 340.29 and 335.01 eV correspond to the characteristic peaks of Pd 2+ 3d 3/2 and 3d 5/2 , indicating that Pd is doped into TiO 2 in the +2 ionic state …”

“…The efficient harnessing of solar energy for hydrogen production plays a pivotal role in advancing clean and renewable energy sources. − Among the various strategies, photocatalytic water splitting has emerged as a promising avenue, converting solar energy into hydrogen chemical. − TiO 2 has garnered significant attention as a photocatalyst due to its exceptional electronic and optical properties . Its wide bandgap, chemical stability, and nontoxic nature have made it the subject of extensive research. − However, the photocatalytic performance of TiO 2 is impeded by the rapid recombination of photoinduced electron–hole pairs and its limited ability to absorb visible light …”