Z‐scheme SnS₂/CsPbBr₃ Heterojunctions for Photoreduction CO₂ Reaction and Related Photoinduced Carrier Behaviors

Abstract

CsPbBr3 perovskite exhibits potential application in photocatalytic CO2 reduction into valuable chemical fuels; however, enhancing carrier separation capability of the CsPbBr3 and fully understanding the CO2 reduction reaction process are still imperative. Herein, a new series of xSnS2/CsPbBr3 nanocrystals (NCs)‐y heterostructures are developed, which exhibit better catalytic activity in comparison with pure CsPbBr3 NCs. Interface and surface carrier dynamic investigation reveals that this heterojunction structure can effectively improve carrier separation efficiency. Based on the interfacial electric field direction of CsPbBr3 to SnS2, it is suggested that SnS2/CsPbBr3 NC heterostructure satisfies Z‐scheme transfer dynamics. Meanwhile, by the aid of in situ surface photovoltage, it is experimentally confirmed there is dynamic carrier interaction between CO2 molecules and the SnS2/CsPbBr3 NCs photocatalyst under irradiation, and a photocatalytic CO2 reduction mechanism is thus proposed. This work expands the awareness of the interaction between CO2 and the photocatalyst, which can be strongly influenced by carrier separation efficiency at the photocatalyst heterojunction.

Photogenerated carrier behavior at a gas–solid interface for CO2 adsorption on Cs2AgBiBr6 nanocrystals

“…2b). 19 This interaction can reduce photogenerated electron accumulation on the front surface of the Cs 2 AgBiBr 6 NCs, leading to a decrease in the SPV signal intensity. Furthermore, the photogenerated carrier dynamics of the Cs 2 AgBiBr 6 NCs were investigated using transient photovoltage technology (TPV).…”

Enhanced Performance of Porphyrin-Modified CuO-Co3O4 Heterojunction as a Photoelectrocatalyst for Methanol Oxidation

“…Figure S9 shows the normalized transient photoluminescence kinetics of Cu 2 Co 1 and TCPP/Cu 2 Co 1 . It can be seen the PL lifetime of TCPP/Cu 2 Co 1 is 1.42 ns, which is lower than that of Cu 2 Co 1 (2.35 ns), indicating that the unrestricted transfer of photogenerated charges in the bulk TCPP/Cu 2 Co 1 . , The synergistic effect of TCPP and Cu 2 Co 1 is further demonstrated by the higher photovoltage intensity of TCPP/Cu 2 Co 1 than Cu 2 Co 1 from the surface photovoltage (SPV) spectra (Figure D). − In summary, the TCPP/Cu 2 Co 1 composite has efficient charge separation and transfer, which has a positive effect on MOR.…”

Boosting Hydrogenation of Graphene Quantum Dot-Modified Photocatalysts: Specific Functionalized Modulation at Active Sites

“…The group-specific interaction-mediated photo-charge transport dynamics between the active sites (pGQDs or rGQDs) and around the reactant molecules (4-NP) dominate the key mechanism of hydrogenation efficiency, which can also be determined through TPV analysis. In our previous study, the photo-charge transport behaviors in the gas–solid interface were investigated to verify the intrinsic mechanism of reduction enhancement promoted by strong adsorption at specific active sites. , Similarly, TPV analyses of all the catalysts in this study (HT, HT/PDDA, HT/PDDA/pGQDs, and HT/PDDA/rGQDs, respectively) before and after the adsorption of 4-NP were separately performed to gain insights into the photo-charge migration dynamics at the catalyst-reactant interface. As illustrated in Figure S13a, the contact between 4-NP molecules and pure HT NPs caused a polarity reversal of the TPV response, further confirming the capture of surface hydroxyl groups; this is similar to the results for HT/PDDA NPs (Figure c).…”