Xin Wang,Yiyang Bi,Chengqian Wang,Ke Li,Yu Zhang,Qun Liu
In this research, we report a simple and cost-effective method for the preparation of two-dimensional (2D) Ni 2 P-Ni(PO 3 ) 2 derived from metal-organic frameworks (MOFs) via a one-step thermal phosphorization strategy. The resulting material is employed to significantly enhance the photocatalytic hydrogen evolution performance of zero-dimensional (0D) CdS nanoparticles. Through an ultrasonic-assisted strategy, the CdS nanoparticles are uniformly dispersed on the surface of Ni 2 P-Ni(PO 3 ) 2 , leading to the successful fabrication of a Ni 2 P-Ni(PO 3 ) 2 /CdS composite with substantially enhanced photocatalytic performance. Under visible light irradiation (λ ≥ 420 nm) using Na 2 S-Na 2 SO 3 as sacrificial agents, the 3 wt% Ni 2 P-Ni(PO 3 ) 2 /CdS composite demonstrated a remarkable photocatalytic hydrogen evolution rate of 2235 µmol g −1 h −1 , which is approximately 7.5 times higher than that of pristine CdS (297 µmol g −1 h −1 ). Over a 20 h cycling experiment, the composite catalyst demonstrated remarkable stability, maintaining around 78 % of its initial hydrogen generation efficiency. The enhanced performance of the composite is ascribed to the role of Ni 2 P-Ni(PO 3 ) 2 in facilitating the separation of photoinduced charge carriers from CdS and improving electrical conductivity. A possible electron-hole transfer mechanism is proposed based on the experimental findings. This work is expected to be helpful in fabricating efficient CdS photocatalysts.
A coral-like Mn 3 O 4 -Ni 2 P/Ni(PO 3 ) 2 heterostructure material is designed for electrocatalytic water and seawater splitting. • The construction of Mn 3 O 4 -Ni 2 P/Ni(PO 3 ) 2 heterostructure regulate the electronic structure and expand more reactive sites. • Both Mn 3 O 4 and Ni(PO 3 ) 2 lower the adsorption energy of Cl − , inhibiting the Cl − oxidation side reaction. • As both anode and cathode, Mn 3 O 4 -Ni 2 P/Ni(PO 3 ) 2 demonstrates stable operation over 200 h. • The generation of phosphate effectively avoid the impact of chlorine evolution during seawater electrolysis. Seawater splitting represents a highly viable method for sustainable hydrogen generation. Nevertheless, the substantial energy demands involved in seawater electrolysis present considerable obstacles, primarily stemming from the chlorine evolution reaction (CER) and the suboptimal hydrogen generation. In this study, multi-component synergistic Mn 3 O 4 -Ni 2 P/Ni(PO 3 ) 2 heterostructure nano-coral catalyst was prepared by a gentle two-step method. It exhibits excellent corrosion resistance and electrochemical performance during alkaline seawater splitting. The generation of phosphate on its surface can effectively avoid the impact of CER during seawater electrolysis. Moreover, as both the anode and cathode, it demonstrates exceptional stability, maintaining consistent performance over 200 h. The Mn 3 O 4 -Ni 2 P/Ni(PO 3 ) 2 heterogeneous structure efficiently controls its electronic structure and expands its reactive regions. This work introduces an innovative design approach for catalysts, revealing their substantial potential for practical seawater splitting applications. Download: Download high-res image (32KB) Download: Download full-size image
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