In-situ ion-exchange synthesis Ag 2 S modified SnS 2 nanosheets toward highly photocurrent response and photocatalytic activity
In-situ ion-exchange synthesis Ag 2 S modified SnS 2 nanosheets toward highly photocurrent response and photocatalytic activity
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原位离子交换合成Ag 2 S修饰的SnS 2 纳米片具有高光电流响应和光催化活性
DOI：
10.1016/j.jcis.2017.10.112
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发表时间：
2018
影响因子：
9.9
通讯作者：
Ming Li
中科院分区：
文献类型：
--
作者：
Yongping Liu;Peng Geng;Jixiang Wang;Zhishu Yang;Huidan Lu;Jiefeng Hai;Zhenhuan Lu;Dayong Fan;Ming Li
异质结光催化系统被认为是改善材料光催化性能的一个很好的选择。以sns2纳米片为原料，采用原位离子交换法制备了Ag2S/ sns2异质结光催化剂。在0.5 M na2so4溶液中，在0.7 V （vs. Ag/AgCl）下，Ag2S/ sns2复合光阳极的光电流密度为13.99μA/cm2，与sns2纳米片相比，其光催化活性显著提高。Ag2S(8 wt%)/ sns2复合材料降解MO的活性最高（0.0440 mg/min），稳定性好。活性物质捕获实验证实空穴（h+）和羟基自由基（dotOH）是活性基团，在光催化降解反应中起关键作用。Ag2S/ sns2异质结具有高效的光电化学和光催化活性，主要归因于光能产生的空穴-电子对的有效分离。本研究为合理设计高性能sns2基光催化剂提供了新的思路。
Heterojunction photocatalyst systems are deemed to be an excellent option to improve the photocatalytic behavior of a material. In this paper, Ag2S/SnS2heterojunction photocatalysts were prepared by a simple in-situ ion exchange method from SnS2nanosheets. The Ag2S/SnS2composite photoanode exhibits 13.99μA/cm2photocurrent density at 0.7 V (vs. Ag/AgCl) in 0.5 M Na2SO4solution and a significant increase in photocatalytic activity compared to SnS2nanosheets. Ag2S (8 wt%)/SnS2composite shows the highest activity (0.0440 mg/min) in the degradation of MO and good stability. The reactive species trapping experiments confirmed hole (h+) and hydroxyl radical (radical dotOH) are active groups and play key roles in the photocatalytic degradation reaction. The highly effective photoelectrochemical and phocatalytic activities of Ag2S/SnS2heterojunctions are attributed to the efficient separation of photogenerated hole-electron pairs. This work may provide a novel concept for the rational design of high performance SnS2-based photocatalysts.