Constructing NCuS Interface Chemical Bonds over SnS₂ for Efficient Solar‐Driven Photoelectrochemical Water Splitting

Abstract

The restricted charge transfer and slow oxygen evolution reaction (OER) dynamics tremendously hamper the realistic implementation of SnS2 photoanodes for photoelectrochemical (PEC) water splitting. Here, a novel strategy is developed to construct interfacial NCuS bonds between NC skeletons and SnS2 (CuNC@SnS2) for efficient PEC water splitting. Compared with SnS2, the PEC activity of CuNC@SnS2 photoelectrode is tremendously heightened, obtaining a current density of 3.40 mA cm2 at 1.23 VRHE with a negatively shifted onset potential of 0.04 VRHE, which is 6.54 times higher than that of SnS2. The detailed experimental characterizations and theoretical calculation demonstrate that the interfacial NCuS bonds enhance the OER kinetic, reduce the surface overpotential, facilitate the separation of photon‐generated carriers, and provide a fast transmission channel for electrons. This work presents a new approach for modulating charge transfer by interfacial bond design in heterojunction photoelectrodes toward promoting PEC performance and solar energy application.

Interfacial Se–O Bonds Modulating Spatial Charge Distribution in FeSe2/Nb:Fe2O3 with Rapid Hole Extraction for Efficient Photoelectrochemical Water Oxidation

“…By contrast with the E F of Nb:Fe 2 O 3 , that of FeSe 2 /Nb:Fe 2 O 3 moved up distinctly. That is, the decoration of FeSe 2 induced band energy regulation at the interface and led to deserved band bending . In order to support this speculation, we used M–S plots to assess the band structures of the two materials.…”

“…Its amorphous property may also contribute to the abundant reaction sites. Figure 5f 50 In order to support this speculation, we used M−S plots to assess the band structures of the two materials. Generally, the flat band potential centers positively by 0.1−0.2 eV than the conduction band for n-type semiconductor.…”

Unique Tubular BiOBr/g‐C3N4 Heterojunction with Efficient Separation of Charge Carriers for Photocatalytic Nitrogen Fixation

“…The electron transition between layers promotes the formation of internal electrostatic field, which contributes to the separation and transfer of electrons and holes. [7][8][9] Hence, BiOBr exhibits significant potential for photocatalytic nitrogen reduction. However, the photocatalytic activity remains weak, which is still far from practical applications.…”

Fast Interfacial Carrier Dynamics Modulated by Bidirectional Charge Transport Channels in ZnIn2S4‐based Composite Photoanodes Probed by Scanning Photoelectrochemical Microscopy

“…Interfacial chemical bonds act as atomic-level charge transfer channels in composite photoanodes, facilitating faster carrier transfer between interfaces and thus accelerating reaction kinetics. [21][22][23] At the same time, we are also considering the possibility of capturing electrons in the conduction band of ZIS using a material with good conductivity, such as Ti 3 AlC 2 . [24][25][26] In particular, Ti 2 C 3 T x MXene quantum dots (MQDs), as a zero-dimensional conductive material, can easily form a dense interface with other materials while inheriting the inherent advantages of their two-dimensional counterparts.…”