An amorphous nickel boride-modified Zn_xCd_1-xS solid solution for enhanced photocatalytic hydrogen evolution

Area of Science:

• Materials Science
• Catalysis
• Renewable Energy

Background:

• Developing efficient co-catalysts is crucial for improving semiconductor photocatalysts.
• Zinc cadmium sulfide (Zn_xCd_1-xS) is a promising material for photocatalytic hydrogen production.
• Amorphous nickel-boron (Ni_xB) has potential as an effective co-catalyst.

Purpose of the Study:

• To rationally design amorphous Ni_xB as a co-catalyst for Zn_xCd_1-xS modification.
• To investigate the effect of Ni_xB on the photocatalytic hydrogen production activity of Zn_xCd_1-xS.
• To elucidate the mechanisms behind the enhanced photocatalytic performance.

Main Methods:

• Synthesis of amorphous Ni_xB via the redox method.
• Hydrothermal synthesis of Zn_xCd_1-xS.
• Coupling of Ni_xB and Zn_xCd_1-xS using electrostatic self-assembly.
• Characterization using UV-vis DRS, PL, TRPL, IT, EIS, and LSV.

Main Results:

• The Ni_xB/Zn_xCd_1-xS composite catalyst with 7 wt% Ni_xB exhibited the highest hydrogen production activity.
• Achieved hydrogen production of 1521 μmol in 5 hours, 4.75 times higher than pure Zn_xCd_1-xS.
• Enhanced visible light absorption, improved photoelectrochemical properties, and efficient electron transfer were observed.

Conclusions:

• Amorphous Ni_xB is an effective co-catalyst for modifying Zn_xCd_1-xS, significantly boosting photocatalytic hydrogen evolution.
• Electrostatic attraction between Ni_xB and Zn_xCd_1-xS facilitates rapid electron transfer, enhancing performance.
• This study offers a new strategy for developing advanced photocatalysts for hydrogen production.