FeF2/BiVO4 heterojuction photoelectrodes and evaluation of its photoelectrochemical performance for water splitting
FeF2/BiVO4 heterojuction photoelectrodes and evaluation of its photoelectrochemical performance for water splitting
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DOI：
10.1016/j.cej.2017.12.126
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发表时间：
2017-12
影响因子：
15.1
通讯作者：
Qizhao Wang;Teng Niu;Lei Wang;Chang-cheng Yan;Jingwei Huang;Jijuan He;H. She;B. Su;Yin Bi-Yin
中科院分区：
文献类型：
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作者：
Qizhao Wang;Teng Niu;Lei Wang;Chang-cheng Yan;Jingwei Huang;Jijuan He;H. She;B. Su;Yin Bi-Yin
通过将FeF2电沉积到BiVO4电极表面，在水分解过程中产生氢气，成功制备了一种新型半导体FeF2/BiVO4。通过对不同FeF2含量的FeF2/BiVO4催化的一系列试验，优化出最有效的催化剂为沉积FeF220圈的催化剂。因此，它能够在3小时内产生635.5μmol H2，是单独BiVO4的三倍。 FeF2/BiVO4 的最佳光阳极在 1.23V vs. RHE 下表现出 2.49mAcm−2 的光电流密度，在 450nm 处的 IPCE 值为 28%，分别是纯 BiVO4 光阳极的 2.26 和 3.73 倍。这主要归因于BiVO4和FeF2结合后增强了可见光范围内的光吸收和光生载流子的传输以及电子和空穴之间的分离能力。同时，它为太阳能分解水项目提供了一种新颖的思路。
A novel type of semiconductor, FeF2/BiVO4was successfully prepared by electric deposition of precipitating FeF2onto the surface of BiVO4electrode so as to generate hydrogen during water splitting process. Via a list of trial catalyzed with FeF2/BiVO4containing different contents of FeF2, the most efficient catalyst was optimised as the one with depositing FeF2for 20 circles. Consequently, it able to produce the amount of 635.5 μmol H2within 3 h, three times more than BiVO4alone. The optimal photoanode of FeF2/BiVO4exhibits a photocurrent density of 2.49 mA cm−2at 1.23 V vs. RHE and an IPCE value of 28% at 450 nm, which are 2.26 and 3.73 times as much as pure BiVO4photoanode, respectively. It is mainly attributed to the enhanced capacities of light absorption in the visible range and transfer of photo-generated carriers as well as separation between electrons and holes after the combination of BiVO4and FeF2. At the same time, it offers a novel idea toward the project of solar water splitting.