The Mott–Schottky heterojunction MoC@NG@ZIS with enhanced kinetic response for promoting photocatalytic hydrogen production

Abstract

Mott-Schottky heterojunctions have been widely used to enhance photocatalytic activity by improving the separation and transfer of photogenerated charges. However, an in-depth exploration of design concepts and photocatalytic mechanisms of...

The 2D van der Waals heterojunction MoC@NG@CN for enhanced photocatalytic hydrogen production

“…To further analyze the electron migration process, we performed ultraviolet photoelectron spectroscopy (UPS) of CN and MoC@NG. 35 As displayed in Fig. 5c, the cutoff energies ( E cut off ) of CN and MoC@NG are 17.34 and 17.02 eV, respectively.…”

“…The work function (F) can be calculated according to the equation: F = hn − E cut off , where the value of hn is 21.22 eV. 35,57 Therefore, the F values of CN and MoC@NG are 3.88 and 4.2 eV, respectively. The Fermi energy levels (E F ) of CN and MoC@NG are determined to be −0.62 and −0.30 V (vs. NHE).…”

“…[31][32][33] Benetting from the d-band center being closer to the Fermi energy level and a higher density of electronic states, MoC exhibits good reactant adsorption and metallike catalytic behavior, and is widely used as a co-catalyst in photocatalysis. [33][34][35] The structure of a heterojunction has an important inuence on photocatalytic efficiency. The face-toface contact between photocatalysts can provide a large number of channels for the transport of photogenerated charges.…”

In situfabrication of MIL-68(In)@ZnIn2S4heterojunction for enhanced photocatalytic hydrogen production

“…23 As for ZIS, the peaks appeared at 445.26 and 452.76 eV are attributed to the In 3+ . 33 After the combination of MIL-68(In) and ZIS, the characteristic peaks of In 3d in MIL-68(In)-20@ZIS shift to the direction of low binding energy. As discerned in Fig.…”

Dual S-scheme ZnO–g-C3N4–CuO heterosystem: a potential photocatalyst for H2 evolution and wastewater treatment

“…Given the DRS knowledge, the E VBM of ZnO and GCN and the E CBM of CuO materials can be obtained to be 2.95 V,1.55 V, and 0.46 V using the equation: E VBM = E CBM + E g , respectively. 56 Moreover, the VB-XPS analysis (Fig. 10(d)) was employed to measure the valence band spectra.…”