Cd0.9Co0.1S Nanorods with an Internal Electric Field and Photothermal Effect Synergistically for Boosting Photocatalytic H2 Evolution

Abstract

The paper reports a strategy to synthesize Cd0.9Co0.1S nanorods (NRs) via a one-pot solvothermal method. Remarkably, the pencil-shaped Cd0.9Co0.1S NRs with a large aspect ratio and good polycrystalline plane structure significantly shorten the photogenerated carrier transfer path and achieve fast separation. An appropriate amount of Co addition enhances visible light-harvesting and generates a photothermal effect to improve the surface reaction kinetics and increases the charge transfer rate. Moreover, the internal electric field facilitates the separation and transfer of carriers and effectively impedes their recombination. As a result, the optimized Cd0.9Co0.1S NRs yield a remarkable H2 evolution rate of 8.009 mmol·g−1·h−1, which is approximately 7.2 times higher than that of pristine CdS. This work improves the photocatalytic hydrogen production rate by tuning and optimizing electronic structures through element addition and using the photothermal synergistic effect.

S-Scheme System of MoS2/Co3O4 Nanocomposites for Enhanced Photocatalytic Hydrogen Evolution and Methyl Violet Dye Removal under Visible Light Irradiation

“…By contrast, it is observed that the MoS 2 /Co 3 O 4 nanocomposites have notable profits for organic pollutants in the photocatalytic system. To check the designed S-scheme's heterostructure, electron spin resonance (ESR) was performed to confirm the free radicals generated in the process of MoS − , which corresponds to the separation of the photoinduced charge carriers and quicker migration in the heterostructure's photocatalysts [40]. In addition, the DMPO-•OH characteristic peaks of MoS 2 , Co 3 O 4 , and MC-4 can be observed in Figure 7b, of which MC-4 nanocomposites own the better characteristic signal peak.…”

Preparation of nanoflower NiO/B−TiO2/ZnIn2S4 composite catalyst with highly efficient hydrogen production and dye degradation performance

“…[2] Therefore, the development of renewable clean energy to replace fossil energy sources will be crucial for simultaneously solving energy and environmental problems. [3] Solar energy generation is renewable environmentally friendly and does not generate pollution. [4] Therefore, solar energy is expected to occupy an important position in the future development of new energy.…”

“…Modern society has a strong dependence on fossil fuels, and one of the most significant challenges facing humankind is gradually shifting the energy supply from fossil fuels to mostly or completely sustainable energy [2] . Therefore, the development of renewable clean energy to replace fossil energy sources will be crucial for simultaneously solving energy and environmental problems [3] . Solar energy generation is renewable environmentally friendly and does not generate pollution [4] .…”