CIZS/S-CoS_(2)混杂材料的制备及其光催化中间级分解水性质研究

Preparation of CIZS/S-CoS_(2)Hybrid Material for Photocatalytic Intermediate Water Splitting

本文采用溶剂热方法,成功合成了一种p型铜铟锌硫(CIZS)固溶体材料。以此为模板材料,通过外延生长的方法,制备了CIZS/ZIF-67混杂材料。我们进一步利用水热硫化方法,使ZIF-67材料转化为CoS_(2)产氢助催化剂;与此同时,利用过量的硫源生成单质硫保护层。最终,我们制备的拥有“p型硫化物+保护层+助催化剂”构型的CIZS/S-CoS_(2)混杂材料,在可见光照射条件下,能以0.264 mmol·h^(-1)·g^(-1)的产氢速率进行纯水的分解。对其反应滤液进行I-t性质测试,发现:反应滤液中存在双氧水。这些结果说明:CIZS/S-CoS_(2)混杂材料采用光催化中间级分解水(PIWS)路线,高效地进行纯水分解。

In this paper,a p type copper indium zinc sulfur(CIZS)solid solution material is successfully synthesized by solvothermal method.Using this as a template material,CIZS/ZIF-67 hybrid material is prepared by epitaxial growth strategy.A CoS_(2)hydrogen production cocatalyst is further converted by the ZIF-67 material by hydrothermal vulcanization method.At the same time,excessive sulfur sources are utilized to generate an elemental sulfur protection layer.Finally,the prepared CIZS/S-CoS_(2)hybrid material with a configuration of“p type sulfide+protection layer+cocatalyst”shows a H2 evolution rate of 0.264 mmol·h^(-1)·g^(-1)under visible light irradiation in pure water splitting.The I-t property is tested and it is found that hydrogen peroxide is present in the reaction filtrate.These results indicate that the photocatalytic pure water splitting process of CIZS/S-CoS_(2)hybrid material is dominated by a PIWS reaction pathway.