中国石油大学戈磊团队报道了用于高效光催化制氢的Au/Co₃O₄/ZnCdS三元球形复合光催化剂的设计与制备。相关研究成果于2024年11月18日发表在《结构化学》。

促进高效的载体分离和转移，可以大大提高光催化性能并抑制光腐蚀。

该文中，研究人员通过自组装策略获得了ZnCdS（ZCS）微球，并通过改进的光沉积方法（在ZnCdS表面负载Co₃O₄和Au）合成了Au/Co₃O₄/ZCS复合材料。S型异质结（Co₃O₄/ZCS）和肖特基结（Au/ZCS）之间的协同效应可以有效地促进光电子和空穴的产生和分离，从而增强光催化活性。

在可见光下，高效光催化剂的产氢活性高达2525μmol·g^-1·h^-1，是Co₃O₄/ZCS的2.24倍，是纯ZnCdS的6.92倍。DFT计算表明，Co₃O₄/ZCS之间的内置电场为有效的电子空穴分离提供了驱动力，Au NPs在ZnCdS界面充当电子收集器以捕获电子，这有效地延长了光电子的寿命，并进一步提高了光催化制氢活性。

附：英文原文

Title: Design and fabrication of ternary Au/Co3O4/ZnCdS spherical composite photocatalyst for facilitating efficient photocatalytic hydrogen production

Author: Linping Li, Junhui Su, Yanping Qiu, Yangqin Gao, Ning Li, Lei Ge

Issue&Volume: 2024-11-18

Abstract: Promoting efficient carrier separation and transfer can largely enhance photocatalytic performance and inhibit photo-corrosion. In this work, ZnCdS (ZCS) microspheres were obtained by a self-assembly strategy, and the Au/Co3O4/ZCS composites were synthesized by a modified photo-deposition method (loading Co3O4 and Au onto the surface of ZnCdS). The synergistic effect between the S-scheme heterojunction (Co3O4/ZCS) and the Schottky junction (Au/ZCS) can effectively promote the generation and separation of photoelectrons and holes, thus enhancing the photocatalytic activity. Under visible light, the efficient photocatalysts showed hydrogen production activities of up to 2525 μmol·g-1·h-1, which is 2.24 times higher than that of Co3O4/ZCS and 6.92 times higher than that of pure ZnCdS. DFT calculations indicate that the built-in electric field between Co3O4/ZCS provides the driving force for efficient electron-hole separation, as well as the Au NPs act as electron collectors at the interface of ZnCdS to capture the electrons, which effectively prolongs the lifetime of photoelectrons and further enhances the photocatalytic hydrogen production activity.

DOI: 10.1016/j.cjsc.2024.100472

Source: http://cjsc.ac.cn/cms/issues/733