A BiVO4 film photoanode with re-annealing treatment and 2D thin Ti3C2TX flakes decoration for enhanced photoelectrochemical water oxidation
A BiVO4 film photoanode with re-annealing treatment and 2D thin Ti3C2TX flakes decoration for enhanced photoelectrochemical water oxidation
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经过再退火处理和二维 Ti3C2TX 薄片装饰的 BiVO4 薄膜光阳极可增强光电化学水氧化
DOI：
10.1016/j.cej.2018.12.146
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发表时间：
2019-04
影响因子：
15.1
通讯作者：
罗和安
中科院分区：
文献类型：
--
作者：
颜德健;付星晨;尚志超;刘冀锴;罗和安
钒酸铋（BiVO 4）是一种很有前途的光电化学水氧化阳极材料。然而，基于BiVO 4的光阳极的PEC性能通常被差的电荷传输和缓慢的析氧反应（OER）动力学所拖累。本文首次在FTO衬底上生长BiVO_4薄膜，通过旋涂Ti_3C_2TX（MXene）薄片制备了Ti_3C_2TX/BiVO_4复合光阳极。在氩气中对裸露的BiVO 4/FTO光阳极进行简单的再退火处理可以将光电流密度从2.1 mA cm−2显著提高到2.95 mA cm−2。实验上，我们清楚地阐明，通过重新退火，界面（BiVO 4/FTO）电荷复合可以有效地抑制由于更好的BiVO 4薄膜和FTO之间的接触。薄Ti 3C 2 TX薄片在BiVO 4膜上的涂层将进一步增加光电流密度至3.45 mA cm-2（在1个太阳光照下相对于可逆氢电极（RHE）在1.23 V下测量），表现出0.78%的光转换效率和73%的表面电荷分离效率。这种优异的光电转换性能主要归功于Ti_3C_2TX（MXene）薄片的包覆，它起到助催化剂的作用，促进了光生载流子的电荷转移，减少了BiVO_4表面的电荷复合。我们的研究结果提供了一个简单的再退火策略和一种新型的二维（2D）材料的Ti 3C 2 TX（MXene）作为助催化剂，以提高性能的BiVO 4光电阳极PEC水氧化。
Bismuth vanadate (BiVO4) has been envisioned as a promising photoanode material for photoelectrochemical (PEC) water oxidation. However, the PEC performance of BiVO4 based photoanodes is usually dragged down by the poor charge transport and slow kinetics for an oxygen evolution reaction (OER). Here, a novel composite photoanode of Ti3C2TX/BiVO4 was fabricated for the first time by spin coating thin Ti3C2TX (MXene) flakes onto.the surface of a BiVO4 film grown on the FTO substrate. A facile re-annealing treatment of bare BiVO4/FTO photoanode in argon can impressively boost the photocurrent density from 2.1 mA cm−2 up to 2.95 mA cm−2. Experimentally, we clearly elucidated that by re-annealing, the interfacial (BiVO4/FTO) charge recombination could be effectively suppressed due to the better contact between the BiVO4 film and FTO. The coating of thin Ti3C2TX flakes onto the BiVO4 film would further increase the photocurrent density to 3.45 mA cm−2 (measured at 1.23 V vs. reversible hydrogen electrode (RHE) under 1 sun illumination), exhibiting a photoconversion efficiency of 0.78% and a surface charge separation efficiency of 73%. The outstanding PEC performance can be.mainly ascribed to the coating of the thin Ti3C2TX (MXene) flakes which function as co-catalysts, facilitating the.charge transfer of the photogenerated carriers and reducing the charge recombination on the BiVO4 surface. Our findings provide a facile re-annealing strategy and a novel two-dimensional (2D) material of Ti3C2TX (MXene) as co-catalysts to improve the performance of the BiVO4 photoanode for PEC water oxidation.
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