Zhang Shengyu, Zhang Gongxin, Wu Shuangzhi, Guan Zhongjie, Li Qiuye, Yang Jianjun
National & Local Joint Engineering Research Center for Applied Technology of Hybrid Nanomaterials, Henan University, Kaifeng 475004, Henan, China.
School of Pharmacy, Henan University, Kaifeng 475004, Henan, China.
J Colloid Interface Sci. 2023 Nov 15;650(Pt B):1974-1982. doi: 10.1016/j.jcis.2023.07.147. Epub 2023 Jul 25.
Integration of photothermal materials and photocatalysts can effectively improve photocatalytic hydrogen production. However, the synergistic mechanism of photothermal effect and heterojunction still need to be deeply investigated. Herein, CoO@ZnInS (ZIS) core-shell heterojunction was constructed as a photothermal/ photocatalytic integrated system for photocatalytic hydrogen production. The photothermal effect induced by CoO boosts the surface reaction kinetic of hydrogen evolution with an apparent activation energy decrease from 42.0 kJ⋅mol to 33.5 kJ⋅mol. The photothermal effect also increases the charge concentrations of CoO@ZIS, which ameliorates the conductivity of CoO@ZIS and thus benefits to charge transfer. In addition, a p-n junction forms between CoO and ZIS and provides a built-in electric field to enhance charge separate and prolong charge life time. Benefiting from the synergy of photothermal effect and heterojunction, the photocatalytic performance of CoO@ZIS is significantly improved with a highest hydrogen evolution rate of 4515 μmol⋅g⋅h, which is about 3.5 times higher than that of pure ZIS. This work offers a full perspective to understand the photothermal/photocatalytic integrated conception for solar hydrogen production.
光热材料与光催化剂的集成可以有效提高光催化产氢性能。然而，光热效应与异质结的协同机制仍需深入研究。在此，构建了CoO@ZnInS（ZIS）核壳异质结作为用于光催化产氢的光热/光催化集成体系。CoO诱导的光热效应促进了析氢的表面反应动力学，表观活化能从42.0 kJ⋅mol降至33.5 kJ⋅mol。光热效应还增加了CoO@ZIS的电荷浓度，改善了CoO@ZIS的导电性，从而有利于电荷转移。此外，CoO与ZIS之间形成了p-n结，并提供了一个内建电场以增强电荷分离并延长电荷寿命。受益于光热效应与异质结的协同作用，CoO@ZIS的光催化性能显著提高，最高析氢速率为4515 μmol⋅g⋅h，约为纯ZIS的3.5倍。这项工作为理解太阳能制氢的光热/光催化集成概念提供了全面的视角。
