Engineering oxygen vacancies on Tb-doped ceria supported Pt catalyst for hydrogen production through steam reforming of long-chain hydrocarbon fuels

Carbon-Coated TiO2 Nanoparticles for Noble-Metal-Free Photocatalytic H2 Production from H2O

“…The C@TiO 2 NPs are characterized by Raman peaks at ∼1360 and ∼1580 cm –1 (Figure b), which are absent in uncoated TiO 2 NPs. More specifically, the G band at ∼1580 cm –1 is attributed to stretching of the sp 2 -bonded carbon atoms in graphitic-type structures, while the D band is correlated to sp 3 carbon atoms due to defects or disorder, presented in graphitic structures . The intensity ratio I D / I G can serve as a metric of the graphitization degree of the nanocarbon layers .…”

“…More specifically, the G band at ∼1580 cm −1 is attributed to stretching of the sp 2 -bonded carbon atoms in graphitic-type structures, while the D band is correlated to sp 3 carbon atoms due to defects or disorder, presented in graphitic structures. 46 The intensity ratio I D /I G can serve as a metric of the graphitization degree of the nanocarbon layers. 36 The I D /I G ratios listed in Table 1 show a nonmonotonous trend.…”

Gelation-induced controlled synthesis of TiO2 with tunable phase transition for efficient photocatalytic hydrogen evolution

“…[5][6][7] Semiconductor photocatalysis is considered a promising strategy by which we can simultaneously mitigate the energy crisis and environmental pollution. [8][9][10][11] Since the first discovery of photocatalytic water splitting in 1972, TiO 2 has been recognized as one of the most promising photocatalysts owing to its chemical stability, non-toxicity, abundance, and low cost. [12][13][14] Since then, researchers have developed various methods, such as hydrothermal, 15,16 sol-gel, 17,18 precipitation, [19][20][21] and chemical vapor deposition, [22][23][24] for the preparation of novel and efficient TiO 2 photocatalysts.…”

Few-Layer Meets Crystalline Structure: Collaborative Efforts for Improving Photocatalytic H2O2 Generation over Carbon Nitride

“…Recently, photocatalytic production of H 2 O 2 from O 2 and H 2 O represents one of the most sustainable and green approaches that meet the aforementioned criteria. − In terms of the photocatalytic H 2 O 2 production process, a semiconductor photocatalyst is photoexcited to generate electron–hole pairs, and then, the photogenerated electrons separate from the holes to drive the O 2 reduction to H 2 O 2 . Up until now, numerous semiconductors, such as TiO 2 , − BiVO 4 , , g-C 3 N 4 , , resorcinol-formaldehyde resins, and covalent triazine framework (CTFs), , have been explored as photocatalysts to realize the process of H 2 O 2 evolution. Among them, g-C 3 N 4 (GCN) as a metal-free polymeric material constructed by C and N elements has merits of proper band structure, superior physiochemical stability, and rich pyridine N as O 2 absorption and activation sites. − These characteristics expect GCN to be a prominent potential catalyst that can selectively drive the reduction of O 2 to H 2 O 2 via photocatalytic processes .…”