Yan Dan, Li Yan, Zhao Fangli, Sun Tao, Fan Jun, Yu Qiushuo, Liu Enzhou
School of Chemical Engineering/Xi'an Key Laboratory of Special Energy Materials, Northwest University, Xi'an, 710069, P. R. China.
Dalton Trans. 2023 Aug 22;52(33):11591-11600. doi: 10.1039/d3dt01737k.
Exploiting efficient and stable photocatalysts is the primary goal of photocatalytic water splitting for H production. In this work, a sea urchin-like bimetallic NiCoO-decorated ZnInS heterojunction was fabricated a solvent evaporation method. Investigation shows that the introduction NiCoO can expand the UV-vis absorption range, enhance the absorption intensity, promote the charge separation, decrease the charge transfer resistance, induce more active sites, and decrease the H evolution overpotential of the composite. Besides, the charge transfer between NiCoO and ZnInS follows a Z-scheme route based on the ˙OH radical capture experiments; this can preserve the strong oxidation-reduction reaction ability of photogenerated electrons and holes, leading to a faster H evolution rate, which reaches 17.28 mmol g h over the 4.8%-NiCoO/ZnInS composite under 300 W Xe lamp irradiation in 20 vol% triethanolamine (TEOA) solution and is 3.0 times higher than that of ZnInS. In addition, NiCoO/ZnInS also has excellent stability during 5 consecutive cycles. This work provides an effective method for constructing a highly effective Z-scheme heterojunction system for photocatalytic H production.
开发高效稳定的光催化剂是光催化水分解制氢的主要目标。在这项工作中，通过溶剂蒸发法制备了一种海胆状双金属NiCoO修饰的ZnInS异质结。研究表明，引入NiCoO可以扩大紫外-可见吸收范围，增强吸收强度，促进电荷分离，降低电荷转移电阻，诱导更多活性位点，并降低复合材料的析氢过电位。此外，基于˙OH自由基捕获实验，NiCoO与ZnInS之间的电荷转移遵循Z型机制；这可以保留光生电子和空穴的强氧化还原反应能力，导致更快的析氢速率，在300 W Xe灯照射下，在20 vol%三乙醇胺（TEOA）溶液中，4.8%-NiCoO/ZnInS复合材料的析氢速率达到17.28 mmol g⁻¹ h⁻¹，比ZnInS高3.0倍。此外，NiCoO/ZnInS在连续5个循环中也具有优异的稳定性。这项工作为构建用于光催化制氢的高效Z型异质结系统提供了一种有效方法。
