Engineering the nanostructures of solution proceed In2Se x S3-x films with enhanced near-infrared absorption for photoelectrochemical water splitting
Engineering the nanostructures of solution proceed In2Se x S3-x films with enhanced near-infrared absorption for photoelectrochemical water splitting
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DOI：
10.1088/1361-6463/ac8b8f
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发表时间：
2022-10-27
影响因子：
3.4
通讯作者：
Zhou, Yu
中科院分区：
文献类型：
--
作者：
Liu, Baoze;Chu, Wenlong;Zhou, Yu
二维（2D）材料已被用于光电化学（PEC）水裂解制氢，但其反应性能受到热力学质子吸附、特定材料太阳吸收光谱、材料载流子迁移率和寿命的限制。在这里，我们报告了一种简单的溶液处理方法，用于合成二维In2Se (x) m3 -x合金薄膜，当退火温度从400℃降至80℃时，观察到明显的结晶向非晶态转变。通过温度控制，形成了不同的多孔纳米结构，在400℃退火的样品比其他样品在近红外范围内的吸收超过200%。晶体样品的瞬态吸收测量清楚地表明，载流子寿命比非晶样品显著提高，这对析氢性能至关重要。最后，测试了PEC的水分解性能，讨论了结构-性能关系，表明增强近红外吸收样品的过电位降低超过100 mV。本工作明确提出了提高光电耦合性能的光学结构和晶体结构设计策略。
Two-dimensional (2D) materials have been utilized for the photoelectrochemical (PEC) production of hydrogen by water splitting, however the reaction performance of which is limited by thermodynamic protons adsorptions, the specific materials solar absorption spectrum, materials carrier mobility and lifetime. Here, we report a facile solution processed method for the synthesis of 2D In2Se (x) S3-x alloy films, in which the obvious crystalline to amorphous transition was observed as the annealing temperature decreased from 400 degrees C to 80 degrees C. Different porous nanostructures of the films have been created by the temperature controls, showing over 200% absorption in the near-infrared range for the sample that annealed at 400 degrees C than the other samples. The transient absorption measurements of crystalline samples are clearly shown the carrier lifetime is dramatically improved than the amorphous samples, which are critical to the hydrogen evolution performance. Finally, the PEC water splitting performances have been measured to discuss the structure-properties relations, showing the overpotentials reduction of over 100 mV for enhanced near-infrared absorption samples. This work clearly gives out the optical structure and crystal structure design strategy for improving the PEC performance.