Facile construction TiO2/ZnIn2S4/Zn0.4Ca0.6In2S4 ternary hetero-structure photo-anode with enhanced photo-electrochemical water-splitting performance
Facile construction TiO2/ZnIn2S4/Zn0.4Ca0.6In2S4 ternary hetero-structure photo-anode with enhanced photo-electrochemical water-splitting performance
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易于构建具有增强光电化学分解水性能的TiO2/ZnIn2S4/Zn0.4Ca0.6In2S4三元异质结构光阳极
DOI：
10.1016/j.surfin.2021.101323
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发表时间：
2021-10
影响因子：
6.2
通讯作者：
Huajun Zheng
中科院分区：
文献类型：
--
作者：
Xiaowei Shi;Chao Dai;Xin Wang;Ping Yang;Lingxia Zheng;Zhefei Zhao;Huajun Zheng
在TiO 2上构建异质结是克服快速电荷复合和缓慢电荷转移动力学的有效途径，但如何设计异质结仍然是光电化学（PEC）水裂解的一个重大挑战。本研究采用水热法（TiO 2/ZIS/ZCIS）依次制备了ZnIn 2S 4（ZIS）和Zn 0. 6Ca 0. 4 In 2S 4（ZCIS）三元异质结，从而显著提高了TiO 2纳米管的光电转换性能。优化后的光阳极在1.23 V时的光电流密度为1.07 mA cm-2，分别是TiO 2和TiO 2/ZIS的3.96倍和1.25倍。与此同时，TiO 2/ZIS/ZCIS的入射光-电流转换效率（IPCE）和外加偏压光-电流转换效率（ABPE）也有所提高。TiO 2、ZIS和ZCIS的适当能带对准和较少的界面缺陷的优点在三元异质结之间建立了内部电场，从而导致增强的导电性和有效的界面电荷分离。这些结果得到了一系列光电化学测量的支持。其中，根据时间分辨光致发光，光生电子-空穴对的平均寿命从1.51（TiO 2）缩短到1.17 ns（TiO 2/ZIS/ZCIS），这表明在TiO 2中产生的电荷载流子在异质结构中具有额外的衰减路径，这有利于电荷分离。我们的策略可以扩展到许多低效率的半导体的设计和合成的有效的光电阳极在PEC水裂解。
Constructing hetero-junction on TiO2is an effective way to overcome the fast charge recombination and slow charge transfer kinetics, but how to design the junction is still a significant challenge in photo-electrochemical (PEC) water splitting. In this study, a considerable improvement in PEC performance for TiO2nanotubes was achieved following the introduction of a ternary hetero-junction through depositing ZnIn2S4(ZIS) and Zn0.6Ca0.4In2S4(ZCIS) in sequence via a facile hydrothermal method (TiO2/ZIS/ZCIS). The optimized photo-anode exhibited a photocurrent density of 1.07 mA cm−2at 1.23 V vs. reversible hydrogen electrode (RHE), to be 3.96 and 1.25 times enhanced compared to that of TiO2and TiO2/ZIS, respectively. Meanwhile, the incident photon-to-current conversion efficiency (IPCE) and applied bias photon-to-current efficiency (ABPE) of TiO2/ZIS/ZCIS were also increased in contrast with its counterparts. The merits of appropriate band alignment of TiO2, ZIS, and ZCIS and fewer interface defects built an internal electric field among the ternary hetero-junction, leading to an enhanced conductivity and efficient interface charge separation. These results were supported by a series of photo-electrochemical measurements. Among others, the shortened average lifetime of photo-generated electron-hole pairs from 1.51 (TiO2) to 1.17 ns (TiO2/ZIS/ZCIS) according to time-resolved photoluminescence reveals that the charge carriers generated in TiO2would have an additional decay pathway in the hetero-structure, which benefits for the charge separation. Our strategy could be extended to many low-efficiency semiconductors for the design and synthesis of effective photo-anodes in PEC water splitting.
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影响因子：
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