Mei Li

The 20% CAO–CdS–CS showed that the average hydrogen evolution rate over 5 hours for 20% CAO–CdS–CS was 43.1 mmol g ⁻¹ h ⁻¹ . Based on XPS and DFT characterization analyses, it is inferred that a Z-scheme heterojunction forms between CoAl ₂ O ₄ and CdS.

Dual-defect engineering boosts photocatalytic H ₂ production by enhancing charge separation and suppressing recombination via a stronger built-in field and higher carrier concentration.

In order to investigate the influence of the ohmic junction formed at the interface between the bimetallic sulfide NiMnS and maple‐leaf CdS on photocatalytic hydrogen evolution performance, this work employed a simple hydrothermal method to synthesise maple‐leaf CdS and granular NiMnS. The optimized composite material (15NiMnS/CdS) achieved an exceptional hydrogen evolution rate of 34.83 mmol·g ⁻¹ ·h ⁻¹ under visible light illumination within 5 h, surpassing the rates of CdS alone and NiMnS alone by 5.44‐fold and 530.70‐fold, respectively. The superior photocatalytic hydrogen evolution performance originates from the fact that the Fermi level of the metal‐like catalyst NiMnS is higher than that of the semiconductor catalyst CdS. This allows the two to form an ohmic junction after contact, creating a strong electronic coupling interface. Electron enrichment occurs at CdS, which inhibits electron–hole recombination and enables electrons to engage in the photocatalytic process efficiently, thus improving its photocatalytic hydrogen evolution ability. The incorporation of NiMnS co‐catalyst increased the CdS charge separation efficiency from 18.67% to 68.16%, thereby improving the catalyst's reaction kinetics and enhancing the photocatalytic hydrogen generation rate. This study presents an example of engineering transition‐metal sulfide‐based Ohmic‐contact structures and enhancing photocatalytic hydrogen evolution performance through strong electronic coupling.

This work enhances photocatalytic hydrogen production efficiency by constructing Mn _0.5 Cd _0.5 S/Nb ₂ CT _X MXene ohmic junctions.

To investigate the effect of varying concentrations of sulfur (S) vacancies in MoS ₂ (MS) on photocatalytic hydrogen evolution reaction (HER), a series of MS photocatalysts with different S vacancy concentrations were synthesized via a hydrothermal method. The results indicate that the as‐prepared MS/CMO composite catalyst exhibits optimal HER at a composite ratio of 10% and a sulfur vacancy concentration of 1:6, achieving a hydrogen evolution amount of 332 μmol within 5 h. The MS ₆ /CMO composite exhibits an apparent quantum efficiency of 12% at a wavelength of 450 nm. Electron paramagnetic resonance (EPR) analysis reveals that the sulfur vacancy concentration in the composite catalyst significantly influences the photocatalytic activity. Mott–Schottky measurements reveal that both CMO and MS display n‐type semiconducting behavior, and are supported by XPS characterization, DFT simulations, and electronic band structure studies. These findings pave a novel pathway for designing vacancy‐modulated catalysts, which hold significant implications for enhancing catalytic efficiency and material stability. Moreover, this work broadens the research perspectives in the field of HER by providing fundamental mechanistic insights and practical design strategies. These findings pave a novel pathway for designing vacancy‐modulated catalysts, which hold significant implications for enhancing catalytic efficiency and material stability.