Enhanced Photocatalytic Hydrogen Evolution by Loading Cd0.5Zn0.5S QDs onto Ni2P Porous Nanosheets

Abstract

Ni2P has been decorated on CdS nanowires or nanorods for efficient photocatalytic H2 production, whereas the specific surface area remains limited because of the large size. Here, the composites of Cd0.5Zn0.5S quantum dots (QDs) on thin Ni2P porous nanosheets with high specific surface area were constructed for noble metal-free photocatalytic H2 generation. The porous Ni2P nanosheets, which were formed by the interconnection of 15–30 nm-sized Ni2P nanoparticles, allowed the uniform loading of 7 nm-sized Cd0.5Zn0.5S QDs and the loading density being controllable. By tuning the content of Ni2P, H2 generation rates of 43.3 μM h− 1 (1 mg photocatalyst) and 700 μM h− 1 (100 mg photocatalyst) and a solar to hydrogen efficiency of 1.5% were achieved for the Ni2P-Cd0.5Zn0.5S composites. The effect of Ni2P content on the light absorption, photoluminescence, and electrochemical property of the composite was systematically studied. Together with the band structure calculation based on density functional theory, the promotion of Ni2P in charge transfer and HER activity together with the shading effect on light absorption were revealed. Such a strategy can be applied to other photocatalysts toward efficient solar hydrogen generation.

Magnetically Separable Fe3O4@CdS Type‐II Nanohybrids with Excellent Photocatalytic Activity and Antibacterial Properties

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g‐C3N4/Cu3P/UiO‐66 Ternary Composites for Enhanced Visible Light Photocatalytic H2 Evolution

“…From Figure D, we can see that the XPS spectra of Cu 2p can be divided into two independent peaks, which belong to 933.1 eV (Cu 2p 3/2 ) and 953.0 eV (Cu 2p 1/2 ) of the following two groups . Figure E shows the binding energy spectrum of P 2p, and the peak value of 134.2 eV corresponds to the surface oxidized copper phosphide . Figure F is the XPS map of Zr 3d.…”

Nickel Glyoximate Based Metal–Covalent Organic Frameworks for Efficient Photocatalytic Hydrogen Evolution

“…The results demonstrated that 0.2 mg mL −1 Ni‐Py‐COF was the optimized dosage under our test conditions (Figure S24). The HER yields presented downtrend when the content of Ni‐Py‐COF increased, which may be attributed to the shading effect that the utilization of light reduced as the dispersion concentration of COFs in the solvent increased [23] …”

“…The HER yields presented downtrend when the content of Ni-Py-COF increased, which may be attributed to the shading effect that the utilization of light reduced as the dispersion concentration of COFs in the solvent increased. [23] The apparent quantum efficiency (AQE) of Ni-Py-COF was calculated to quantify the photocatalytic activity for hydrogen evolution over the spectral distribution. The AQE, as a function of incident light wavelength, was measured using three different bandpass filters with central wavelengths of 420, 520 and 600 nm.…”