Oriented CuWO4 Films for Improved Photoelectrochemical Water Splitting
Oriented CuWO4 Films for Improved Photoelectrochemical Water Splitting
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用于改进光电化学水分解的定向 CuWO4 薄膜
DOI：
10.1021/acsami.2c13002
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发表时间：
2022-10-13
影响因子：
9.5
通讯作者：
Li, Jie
中科院分区：
文献类型：
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作者：
Chen, Long;Li, Wenzhang;Li, Jie
通过光电化学（PEC）技术制氢是提供可持续燃料的最合适的方法之一。同时，具有低晶体对称性的材料将表现出各向异性性质，从而允许通过控制晶体取向和暴露的小面来调节PEC性质。因此，我们通过调节前驱体溶液中的阴离子，合成了具有高度暴露的（100）晶面的钨酸铜薄膜（CuWO 4）。根据实验表征和密度泛函理论计算，（100）晶面高曝光率的CuWO 4薄膜促进了电荷的无陷阱模式输运，减少了电子和空穴的复合。同时，由于相对较低的能垒，在（100）面上促进了析氧反应。与其他混合面的CuWO 4相比，具有高曝光（100）面的CuWO 4具有两倍的电流密度（0.38 mA/cm 2）和1/15的电子渡越时间（0.698 ms），并且具有很好的稳定性（大于6 h）。这些结果提供了一种简单的方法来提高PEC性能，通过调制膜电极的曝光面。
Hydrogen generation through photoelectrochemical (PEC) technology is one of the most appropriate ways for delivering sustainable fuel. Simultaneously, anisotropic properties will be exhibited by the materials with low crystal symmetry, allowing the tuning of the PEC properties by controlling the crystallographic orientation and exposed facets. Therefore, we synthesized copper tungstate films (CuWO4) with highly exposed (100) crystal facets by regulating anions in the precursor solution. According to experimental characterization and density functional theory calculations, the CuWO4 film with a high exposure ratio of the (100) crystal facet has promoted charge transport with trap free mode and reduced recombination of electrons and holes. Meanwhile, the oxygen evolution reaction is promoted on the (100) facet because of the relatively low energy barrier. Compared to the CuWO4 with other mixed exposure facets, CuWO4 with a highly exposed (100) facet presents a twofold current density (0.38 mA/cm2) and one-fifteenth electron transit time (0.698 ms) and also has great stability (more than 6 h). These results provide an easy way to enhance the PEC performance by modulating the exposure facets of the film electrode.