Tunable Interfacial Charge Transfer in a 2D–2D Composite for Efficient Visible‐Light‐Driven CO₂ Conversion

Abstract

Photocatalytic CO 2 conversion for hydrocarbon fuel production has been known as one of the most promising strategies for achieving carbon neutrality. Yet, its conversion efficiency remains unsatisfactory mainly due to its severe charge-transfer resistance and slow charge kinetics. Herein, a tunable interfacial charge transfer on an oxygen-vacancies-modified bismuth molybdate nanoflower assembled by 2D nanosheets (BMOVs) and 2D bismuthene composite (Bi/BMOVs) is demonstrated for photocatalytic CO 2 conversion. Specifically, the meticulous design of the Ohmic contact formed between BMOVs and bismuthene can allow the modulation of the interfacial charge-transfer resistance. According to density functional theory (DFT) simulations, it is ascertained that such exceptional charge kinetics is attributed to the tunable built-in electric field (IEF) of the Ohmic contact. As such, the photocatalytic CO 2 reduction performance of the optimized Bi/BMOVs (CO and CH 4 productions rate of 169.93 and 4.65 μmol g −1 h −1 , respectively) is ca. 10 times higher than that of the pristine BMO (CO and CH 4 production rates of 16.06 and 0.51 μmol g −1 h −1 , respectively). The tunable interfacial resistance of the Ohmic contact reported in this work can shed some important light on the design of highly efficient photocatalysts for both energy and environmental applications.

Optimization of Intercalated 2D BiOCl Sheets into Bi2WO6 Flowers for Photocatalytic NH3 Production and Antibiotic Pollutant Degradation

“…Photocurrent densities of Bi 2 WO 6 , BiOCl, and BW–BiOCl 0.25 reach up to 0.21, 0.34, and 0.65 μA cm –2 when irradiated with a 300 W Xe lamp. It is evident that, after the formation of heterojunction, it illustrates a superior photoresponse compared to its pristine counterparts, proving its dominant photocatalytic property, as reflected in the nitrogen conversion and CIP degradation . Moreover, Bi 2 WO 6 and BiOCl depict a spike at the ON cycle with a sudden drop until the photocurrent reaches a stable value, indicating that the electron–hole pairs produced due to the irradiation recombine very quickly until they reach an equilibrium value.…”

“…It is evident that, after the formation of heterojunction, it illustrates a superior photoresponse compared to its pristine counterparts, proving its dominant photocatalytic property, as reflected in the nitrogen conversion and CIP degradation. 56 Moreover, Bi 2 WO 6 and BiOCl depict a spike at the ON cycle with a sudden drop until the photocurrent reaches a stable value, indicating that the electron−hole pairs produced due to the irradiation recombine very quickly until they reach an equilibrium value. However, BW−BiOCl 0.25 shows a steady increase in photocurrent with the ON cycle, and when the irradiation is OFF, the current curve also has a gradual decay phenomenon until the light is ON again.…”

Tuning and Sustainment of High Surface Area of Nano CeO2-Anchored NiMOF Flake Heterojunctions for Efficient Photocatalytic Hydrogen Generation

“…The increased usage and excessive exploitation of fossil fuels and non-renewable energy resources have lead to an alarming rise in global warming and ozone depletion. Hence, finding an environmental friendly alternative energy source is crucial for sustainable global population and development. , Solar energy is the traditional and most promising source of renewable energy so far. However, the main drawback of solar energy is its intensity variation that largely relies upon time, geographical location, and local weather. − Therefore, capturing solar energy and storing it in various chemical forms are highly desirable for its effective consumption for sustainable development.…”

Preparation of Oxygen-Doping Nongraphitic Carbon Nitride via Efficiency Exfoliation for the Application of Photocatalytic Degradation

“…The conversion of solar energy into value-added chemical energy is attracting worldwide attention for its potential to address growing energy needs and environmental crises. , Photocatalysis has great potential in the degradation of organic pollutants due to its advantages of environmental friendliness and good reusability. , Among them, semiconductor photocatalysis is effective for removing organic pollutants from water . Since the discovery of metal-free graphitic phase carbon nitride (g-C 3 N 4 ) with visible photocatalytic decomposition of water by Wang et al in 2008, g-C 3 N 4 has been playing an increasingly important role in photocatalytic hydrogen production, organic pollutant degradation, , and environmental pollution remediation due to its low cost, nontoxicity, good visible light response, and suitable electron energy band structure .…”

“…The conversion of solar energy into value-added chemical energy is attracting worldwide attention for its potential to address growing energy needs and environmental crises. 1,2 Photocatalysis has great potential in the degradation of organic pollutants due to its advantages of environmental friendliness and good reusability. 3,4 Among them, semiconductor photocatalysis is effective for removing organic pollutants from water.…”