CoP decorated 2D/2D red phosphorus/B doped g-C₃N₄ type II heterojunction for boosted pure water splitting activity via the two-electron pathway

Abstract

CoP decorated 2D/2D red phosphorus/B doped g-C3N4 heterojunction enabled photocatalytic pure water splitting to produce H2 with a two-electron process.

Photocatalytic Water Splitting for H2 Production via Two‐electron Pathway

“…[95] CoP decorated 2D/2D red phosphorus/B doped g-C 3 N 4 (CoP/RP/BCN) was prepared to construct type II heterojunction to achieve pure water splitting activity via the two-electron pathway. [25] As shown in Figure 5c, the photogenerated electrons in the CB of BCN were transferred to the surface of CoP by the electron route of RP, which reduced water into H 2 . Meanwhile, the photogenerated holes were aggregated in the VB of BCN to oxidize water and generate H 2 O 2 .…”

“…On the other hand, typically four-electron pathway of water splitting (2H 2 O!2H 2 + O 2 ) requires an energy of 4×1.23 eV, resulting in thermodynamically more favorable than two-electron pathway. [25] However, the selectivity of water splitting pathway also depends on the O-binding free energy (ΔGO) of photocatalysts and the formation energy of H 2 O 2 (ΔGH 2 O 2 ). Under the condition of ΔGO > ΔGH 2 O 2 , the quick H 2 O 2 evolution kinetics reveal the potential of two-electron pathway with catalystinducement.…”

Hierarchical hollow TiO2/In2S3 heterojunction photocatalyst decorated with spatially separated dual co-catalysts for enhanced photocatalytic H2 evolution

“…To compensate for the inadequate proffer of charge separation at the heterojunction interface and improve the sluggish surface reaction dynamics, the co-catalyst modification has been validated to effectively improve the photocatalytic activity by facilitating charge transport and decreasing the surface activation energy. 19–22 Compared with the loading of a single co-catalyst, dual co-catalyst loading with different functions provides rich active centers and migration channels for both electrons and holes, thus achieving increased charge separation and outstanding photocatalytic performance. 23–26 He et al reported the CdS nanorods decorated with both reduction co-catalyst Ag 2 S and oxidation co-catalyst NiS for drastically elevated hydrogen production performance.…”

Constructing Z-scheme heterojunctions of Zr-MOF/g-C3N4 for highly efficient photocatalytic H2 production under visible light

“…g-C 3 N 4 is a valuable photocatalyst with the advantages of low cost, simple preparation and high chemical and thermal stabilities and has been widely explored to prepare heterogeneous catalysts for photocatalytic hydrogen production. 15 However, it exhibits a relatively narrow response range to visible light, fast charge recombination, and low specific surface area, which hinders its further application in efficient photocatalytic hydrogen production under visible light. 16 Overcoming the drawbacks shown by the MOF and g-C 3 N 4 , heterojunction composites fabricated using these materials have shown significant advantages for achieving photocatalytic hydrogen production.…”