A Full Compositional Range for a (Ga_1-xZn_x)(N_1-xO_x) Nanostructure: High Efficiency for Overall Water Splitting and Optical Properties

Abstract

Bulk (Ga1-x Zn x )(N1-x O x ) as a photocatalyst has received increasing attention as a potential solution for the energy shortage challenge; however, its catalytic performance is highly limited by its bulk form. To improve the photochemical potential, the nanoscale form of this multiple-metal oxynitrides is desirable. In this work, a new type of (Ga1-x Zn x )(N1-x O x ) nanostructure is obtained. Its composition can tuned to the full range (0.18 < x < 0.95). The (Ga1-x Zn x )(N1-x O x ) nanostructure exhibits excellent photocatalytic activity for overall water splitting, and the highest quantum efficiency of (Ga1-x Zn x )(N1-x O x ) is as high as 17.3% under visible light irradiation. Using this new type of (Ga1-x Zn x )(N1-x O x ) nanostructure, the narrowing of the bandgap for (Ga1-x Zn x )(N1-x O x ) is not only due to an increase in the valence band maximum, but it is also related to a decrease in the conduction band minimum.

Synthesis of ZrO2:Fe nanostructures with visible-light driven H2 evolution activity

“…They found that the Fe dopants were inclined to be located at the interstitial site when the ZrO 2 was in a cubic phase. 21,22 The preparation detail information could be seen in the experimental information. 19 Furthermore, due to the high sintering temperature, the dopants always precipitated from the ZrO 2 structure.…”

“…As well known, the nanomaterials have small size and high surface energy which can always reduce the reaction temperature signicantly. 20,21,23 First, the hollow sphere morphology had a high specic surface area, which meant that more areas could be illuminated. Our strategy for synthesizing Fe doped ZrO 2 nanostructures was based on the calculation results above and our previous reports.…”

Preparation of ZnFe2O4 nanostructures and highly efficient visible-light-driven hydrogen generation with the assistance of nanoheterostructures

“…[19][20][21] Briey, carbon spheres were rst synthesized using the method reported by Li et al 22 Then zinc nitrate hexahydrate (Zn(NO 3 ) 2 $6(H 2 O), 99% purity, 10 mmol) and iron(III) nitrate nonahydrate (Fe(NO 3 ) 3 $9H 2 O, 99% purity, 1 mmol) were dissolved in 200 mL of DMF (N,N-dimethylformamide, 99.8% purity). [19][20][21] Briey, carbon spheres were rst synthesized using the method reported by Li et al 22 Then zinc nitrate hexahydrate (Zn(NO 3 ) 2 $6(H 2 O), 99% purity, 10 mmol) and iron(III) nitrate nonahydrate (Fe(NO 3 ) 3 $9H 2 O, 99% purity, 1 mmol) were dissolved in 200 mL of DMF (N,N-dimethylformamide, 99.8% purity).…”

Band gap engineering of N-alloyed Ga2O3 thin films

“…Such large bowings have been observed in other material system such as (ZnO) 1-x (GaN) x and (ZnO) 1-x (AlN) x . [24][25][26][27] Additionally, for N-alloyed Ga 2 O 3 , the effects of phase transition may need to be considered. The introduction of N into Ga 2 O 3 will lift up the valence band.…”