一锅法制备1T/2H-WS_(2)/WO_(3)异质结用于紫外可见光催化的CO_(2)还原

One-pot Synthesis of WS_(2)/WO_(3) Heterojunction for UV-Visible-light-driven CO_(2) Reduction to CO

采用一锅水热法制备了1T/2H-WS_(2)/WO_(3)异质结,并利用XRD、SEM、XPS等对所制备的光催化材料进行了系统微结构表征.研究发现该异质结催化剂可用水蒸汽作为电子供体,利用可见光催化还原CO_(2),以3.87μmol∙g^(−1)∙h^(−1)的速率高选择性地生成唯一产物CO.在紫外-可见光辐照下,表现出更优异的催化活性(34.39μmol∙g^(−1)∙h^(−1)).经4次循环实验,仍然表现出稳定的光催化二氧化碳还原效率,证明其具有优异的稳定性.

Photocatalytic reduction of CO_(2)to produce energy-rich hydrocarbons without sacrificing reagents is of great significance.Here,the 1T/2H-WS_(2)/WO_(3)heterojunction catalyst is prepared by one-pot hydrothermal method,which shows a prominent CO_(2)reduction performance with water as an electron donor,affording CO as the sole carbonaceous product at a production rate of 3.87μmol∙g^(-1)∙h^(-1)under visible light.Moreover,under UV-visible light irradiation,the 1T/2H-WS_(2)/WO_(3)photocatalyst shows better catalytic activity and 34.39μmol∙g^(-1)∙h^(-1)yield of CO.Importantly,the stability test shows no distinctive performance degradation even after 64 h reaction.This work provides new insight for designing and fabricating semiconductor heterojunction photocatalysts with high efficiency for solar-energy conversion.