摘要
以ZIF-67作钴源,经水热反应和煅烧得到Co_(3)S_(4),之后采用一步水浴法将Co_(3)S_(4)负载到CdS上,制备得到Co_(3)S_(4)/CdS复合催化剂。利用扫描电镜(SEM)、透射电镜(TEM)、紫外可见漫反射(UV-Vis)、光致发光(PL)和X射线衍射(XRD)等手段对Co_(3)S_(4)/CdS复合催化剂的结构和形貌进行了表征,通过光催化分解水制氢反应评价了其可见光催化活性。结果表明:负载Co_(3)S_(4)使催化剂的带隙由原来的2.17 eV减小至1.55 eV,提高了催化剂对光的利用率。催化剂的比表面积也由原来的61.82 m^(2)·g^(-1)增加至99.41 m^(2)·g^(-1),使催化剂暴露出更多的活性位点。此外,Co_(3)S_(4)/CdS复合催化剂的光催化制氢性也能明显增强,最高可达102.67 mmol·(g·h)^(−1)。最后根据表征和实验结果,提出一种可能的光催化机理,Co_(3)S_(4)与CdS吸收太阳光产生电子,在异质结的作用下,电子由Co_(3)S_(4)的VB向CdS的VB迁移,聚集在CdS上进行还原反应生成H2。
In this paper,Co_(3)S_(4) was obtained by hydrothermal reaction and calcination using ZIF-67 as cobalt source.Co_(3)S_(4)/CdS composite catalyst was obtained by loading Co_(3)S_(4) onto CdS with water bath loading method.The structure and morphology of the Co_(3)S_(4)/CdS compos-ite catalyst were characterized by scanning electron microscopy(SEM),transmission electron microscopy(TEM),UV-visible diffuse reflection(UV-Vis),photoluminescence(PL)and X-ray diffraction(XRD).The photocatalytic activity of the catalyst was evaluated by the pho-tocatalytic decomposition of water to produce hydrogen.The results show that the support Co_(3)S_(4) reduces the band gap of the catalyst from 2.17 eV to 1.55 eV,which improves the utili-zation rate of the catalyst to light.The specific surface area of the catalyst increased from 61.82 m^(2)·g^(-1) to 99.41 m^(2)·g^(-1),which exposed more active sites.In addition,the photocata-lytic hydrogen production performance of Co_(3)S_(4)/CdS composite catalyst was significantly enhanced,up to 102.67 mmol·(g·h)^(-1).Finally,according to the characterization and experimental results,a possible photocatalytic mechanism is proposed.Co_(3)S_(4) and CdS absorb sunlight to produce electrons.Under the action of heterostructures,electrons migrate from VB of Co_(3)S_(4) to VB of CdS,and gather on CdS for reduction reaction to produce H2.
作者
李维平
蒋璐璐
高永生
王海鹏
赵国峰
吕志果
LI Weiping;JIANG Lulu;GAO Yongsheng;WANG Haipeng;ZHAO Guofeng;LYU Zhiguo(College of Chemical Engineering,Qingdao University of Science and Technology,Qingdao 266042,China)
出处
《青岛科技大学学报(自然科学版)》
2025年第5期33-41,共9页
Journal of Qingdao University of Science and Technology(Natural Science Edition)
基金
国家自然科学基金项目(NSFC21978141).
