MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, China.
MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, China.
J Colloid Interface Sci. 2023 Apr;635:284-294. doi: 10.1016/j.jcis.2022.12.131. Epub 2022 Dec 27.
The construction of S-scheme heterojunctions is an effective approach to realize artificial photocatalytic processes. For the higher solar energy conversion efficiency, current research focuses on improving the interfacial intimacy and precisely modulating the strength of the internal electric field (IEF). To address this issue, we propose a novel MOF-based synthesis and derivation strategy. The heterojunction obtained by this strategy tends to form an intimate interface and a tunable IEF, which facilitates the transfer and separation of photogenerated carriers. Herein, a ZnS/ZnInS (ZIS) S-Scheme heterojunction containing sulfur vacancies (Sv) was successfully synthesized, and its good photocatalytic hydrogen evolution reaction (HER) and CO reduction reaction (CORR) activity confirmed the feasibility of this strategy. The prepared Sv-ZnS/ZIS exhibits an apparent quantum yield of 19.8 ± 1.0 % at 420 nm and a hydrogen evolution rate of 2912.3 ± 185.9 μmol gh, which is 9.0 and 33.6 times higher than pure ZIS and Sv-ZnS, respectively. Furthermore, the yield of photoreduction CO to CO reaches 2075.7 ± 63.0 μmol gh with a CO selectivity of 93.0 ± 0.8 %. This work provides new sights for the rational design and construction of S-scheme photocatalysts with sulfur vacancies for efficient photocatalysis.
构建 S 型异质结是实现人工光催化过程的有效方法。为了提高太阳能的转化效率，目前的研究重点在于提高界面的紧密性，并精确调节内电场（IEF）的强度。针对这一问题，我们提出了一种基于 MOF 的新型合成和衍生策略。该策略得到的异质结易于形成紧密的界面和可调的 IEF，有利于光生载流子的转移和分离。在此，我们成功合成了一种含有硫空位（Sv）的 ZnS/ZnInS（ZIS）S 型异质结，并证实了其良好的光催化析氢反应（HER）和 CO 还原反应（CORR）活性，证明了该策略的可行性。所制备的 Sv-ZnS/ZIS 在 420nm 下的表观量子效率为 19.8±1.0%，析氢速率为 2912.3±185.9μmolgh，分别是纯 ZIS 和 Sv-ZnS 的 9.0 和 33.6 倍。此外，光还原 CO 生成 CO 的产率达到 2075.7±63.0μmolgh，CO 选择性为 93.0±0.8%。这项工作为设计和构建具有硫空位的 S 型光催化剂提供了新的思路，以实现高效的光催化。
