Au/Cu2O Schottky contact heterostructures with enhanced photocatalytic activity in dye decomposition and photoelectrochemical water splitting under visible light irradiation
Au/Cu2O Schottky contact heterostructures with enhanced photocatalytic activity in dye decomposition and photoelectrochemical water splitting under visible light irradiation
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DOI：
10.1016/j.jallcom.2016.05.192
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发表时间：
2016-11
影响因子：
6.2
通讯作者：
Weiwei Zhang;Baoshun Wang;Chenchun Hao;Yujie Liang;Honglong Shi;L. Ao;Wenzhong Wang
中科院分区：
文献类型：
--
作者：
Weiwei Zhang;Baoshun Wang;Chenchun Hao;Yujie Liang;Honglong Shi;L. Ao;Wenzhong Wang
在本工作中，我们成功地在Cu2O表面沉积了贵金属Au纳米粒子以构建紧密的Au/Cu2O肖特基接触异质结，其中由于肖特基结的存在，在Au和Cu2O的界面上建立了从Au到Cu2O的内电场和肖特基势垒。由于这种独特的结构以及内电场和Schokkty势垒的协同效应，所制备的Au/Cu2O肖特基接触异质结在可见光照射下对纯Cu2O微米级的染料分解和水分解表现出更高的光催化活性。在可见光照射90min时，Au/Cu2O肖特基接触异质结对甲基橙(MO)的光降解速率是纯Cu2O微立方体的1.2倍。制备的Au/Cu2O异质结电极的光电流密度可达30μA/cm−2，比纯Cu2O微立方电极在1.23V/RHE下的光电流密度(10μA/cm−2)高3倍。Au/Cu2O肖特基接触异质结构光催化活性的提高归因于内电场和Schokkty势垒的协同作用。详细讨论了所制备的Au/Cu2O异质结的光致电子和空穴转移过程以及光催化性能的增强机理。这项研究为设计具有高度增强性能的太阳能转换光活性材料开辟了新的机会。
In this work noble metal Au nanoparticles have been successfully deposited on the surface of Cu2O microcubes to construct close Au/Cu2O Schottky contact heterostructures, in which both an inner electronic field from Au to Cu2O and a Schottky barrier are established at the interface of Au and Cu2O due to the Schottky junction. Benefiting from this unique structure with synergistic effect of inner electronic field and Schokkty barrier, the as-fabricated Au/Cu2O Schottky contact heterostructures exhibit enhanced photocatalytic activity to pure Cu2O microcubes in dye decomposition and water splitting under visible light illumination. The photodegradation rate of the as-constructed Au/Cu2O Schottky contact heterostructures for methyl orange (MO) is 1.2 times higher than that of pure Cu2O microcubes under visible light irradiation for 90 min. The photocurrent density of the as-prepared Au/Cu2O heterostructures electrode reaches up to 30 μA cm−2, which is 3 times higher than that (10 μA cm−2) of pure Cu2O microcube electrode at 1.23 V vs RHE. The enhanced photocatalytic activity of the as-constructed Au/Cu2O Schottky contact heterostructures is attributed to the synergistic effect of inner electronic field and Schokkty barrier. The transfer process of the photoexcited electrons and holes, and the enhancement mechanism of photocatalytic performance of the as-fabricated Au/Cu2O heterostructures are discussed in detail. This study opens up new opportunities in designing photoactive materials with highly enhanced performance for solar energy conversion.