Abstract
Effective bulk phase and surface charge separation is critical for charge utilization during the photo-catalytic energy conversion process.In this work,the ternary Ni2P-NiS/twinned Mn0.5Cd0.5S(T-MCS)nanohybrids were successfully constructed via combining Ni2P-NiS with T-MCS solid solution for visible light photocatalytic H2 evolution.T-MCS is composed of zinc blende Mn0.5Cd0.5S(ZB-MCS)and wurtzite Mn0.5Cd0.5S(WZ-MCS)and those two alternatively arranged crystal phases endow T-MCS with excellent bulk phase charge separation performance for the slight energy level difference between ZB-MCS and WZ-MCS.S-scheme carriers transfer route between NiS and T-MCS can accelerate the interfacial charge separation and retain the active electrons and holes,meanwhile,co-catalyst Ni2P as electron receiver and proton reduction center can further optimize the H2 evolution reaction kinetics based on the surface Schottky barrier effect.The above-formed homo-heterojunctions can establish multiple charge transfer channels in the bulk phase of T-MCS and interface of T-MCS and Ni2P-NiS.Under the synergistic effect of twinned homojunction,S-scheme heterojunction,and Schottky barrier,the ternary Ni2P-NiS/T-MCS com-posite manifested an H2 production rate of 122.5 mmol h-1 g-1,which was 1.33,1.24,and 2.58 times higher than those of the NiS/T-MCS(92.4 mmol h-1 g-1),Ni2P/T-MCS(98.4 mmol h-1 g-1),and T-MCS(47.5 mmol h-1 g-1),respectively.This work demonstrates a promising strategy to develop efficient sul-fides photocatalyst toward targeted solar-driven H2 evolution through homo-heterojunction engineering.
基金项目
国家自然科学基金(22078261)
国家自然科学基金(21676213)
国家自然科学基金(11974276)
Natural Science Basic Research Program of Shaanxi Province(2023-JC-YB-115)
Shaanxi Key Science and Technology Innovation Team Project(2022TD-33)
National College Student Innovation and Entrepreneurship Training Program(202210697069)
Shiyanjia Lab()
NETL
NSTL
万方数据