Construction of CoP/Cu₃P/Ni₂P Double S-Scheme Heterojunctions for Improved Photocatalytic Hydrogen Evolution

Abstract

The S-scheme heterojunctions exhibit great potential for photocatalytic hydrogen evolution, which helps not only maintain a stronger redox capability for photocatalysts but also achieve the efficient separation and transfer of photo-induced charge carriers. Herein, metal-organic frameworks (MOF)-derived CoP/Cu3P/Ni2P (CCNP) double S-scheme photocatalytic systems were constructed by simple hydrothermal and phosphating. The optimized CCNP photocatalyst revealed the maximum photocatalytic hydrogen evolution activity of 786.58 μmol with an apparent quantum efficiency of 3.69%, which is roughly 2.64 and 3.33 times higher than that of CoP (CP) and CoP/Ni2P (CNP), respectively. The improved hydrogen production performance is attributed to the formation of S-scheme heterojunctions that facilitate the accelerated electron–hole transfer while maintaining the strong redox ability of the catalysts, and to the fact that the MOF-derived composite catalysts still maintain the dodecahedral shape that facilitates the attachment of Cu3P and Ni2P, while their tight bonding facilitates the charge transfer. This work helped design a novel double S-scheme CoP/Cu3P/Ni2P heterojunction derived from MOF for efficient artificial solar energy conversion.

Mechanochemical preparation of graphdiyne (CnH2n−2) based Ni-doped MoS2S-scheme heterojunctions within situXPS characterization for efficient hydrogen production

“…This indicates that the sample was successfully prepared. 64 3.7 Analysis of in situ radiation XPS spectra and XPS spectra…”

Ti3C2 MXene Induced Efficient Electron Transfer over Bimetallic Sulfides and Layered Double Hydroxides

“…[42][43][44] In the fine spectrum of Ni 2p (Figure 3d), there are distinct diffraction peaks at 856.13 and 873.84 eV, attributed to the Ni 2p 3/2 and Ni 2p 1/2 orbitals, respectively. [45][46][47][48][49] in the fine spectrum of Al 2p (Figure 3e), there are distinct diffraction peaks at 68.35 and 73.31 eV, attributed to the Al and Al hydroxides, respectively. [50][51][52] In the fine spectrum of Ti 2p in the high-resolution spectrum (Figure 3f), no obvious diffraction peaks are observed, which is due to the extremely low content of Ti 3 C 2 in ZCSNAT.…”

Constructing Type-II and S-Scheme Heterojunctions of Cu2O@Cu4(SO4)(OH)6·H2O Polyhedra by In Situ Etching Cu2O with Different Exposed Facets for Enhanced Photocatalytic Sterilization and Degradation Performance

“…45 Moreover, the Fermi levels (E f ) of a semiconductor can be roughly estimated by the E fb. 46 The E fb 's of single and core−shell catalysts were estimated according to Figures S6A, B and the E f 's were calculated by the formula E f ≈ E NHE = E SCE + 0.241 V; the E fb 's and E f 's of the catalysts are listed in Table 3.…”