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Blue‐light‐excited NaCe(MoO4)2 microcrystals for photoelectrochemical water splitting
International Journal of Applied Ceramic Technology ( IF 1.8 ) Pub Date : 2020-12-29 , DOI: 10.1111/ijac.13697
João Victor Barbosa Moura 1 , Antonio Amison Gomes de Souza 1 , Paulo Tarso Cavalcante Freire 2 , Cleanio Luz Lima 3 , Thiago Mielle Brito Ferreira Oliveira 1
Affiliation  

We report the structural, morphological, and optical characterization, and the application of sodium‐cerium molybdate (NaCe(MoO4)2) as a promising photoelectroactive material for water splitting. Information on these several properties was obtained by X‐ray diffraction, Raman spectroscopy, scanning electron microscopy, and UV–Vis–NIR diffuse reflectance. For the photoelectrochemical tests, NaCe(MoO4)2 microcrystals were deposited on conductive indium‐tin oxide (ITO) glass substrate by drop coating, and the activity of the as‐prepared photoanode toward oxygen evolution reaction was investigated in the absence and presence of blue light‐emitting diode irradiation. Studies carried out by linear sweep voltammetry, chronoamperometry, and electrochemical impedance spectroscopy attested to a significant photoelectroactivity of molybdate associated with the fast electron‐hole pairs generation. The steady‐state photocurrent density recorded under irradiation achieved a remarkable increase, varying from 1.5 µA cm−2 (light off) to 44.1 µA cm−2 (light on), in addition, it presents high stability after on–off cycles, what proves the proper performance of NaCe(MoO4)2/ITO as photoanode for water splitting.

中文翻译:

蓝光激发NaCe(MoO4)2微晶体用于光电化学水分解

我们报告了结构,形态和光学特性,以及钼酸钠铈(NaCe(MoO 42)作为有希望的水分解光电子活性材料的应用。通过X射线衍射,拉曼光谱,扫描电子显微镜和UV-Vis-NIR漫反射率获得了关于这几种特性的信息。对于光电化学测试,NaCe(MoO 42通过滴涂法将微晶沉积在导电的铟锡氧化物(ITO)玻璃基板上,并且在不存在和存在蓝色发光二极管辐射的情况下,研究了所制备的光阳极对放氧反应的活性。通过线性扫描伏安法,计时电流法和电化学阻抗谱进行的研究证明,钼酸盐具有显着的光电子活性,与快速电子-空穴对的产生有关。辐照下记录的稳态光电流密度实现了显着提高,从1.5 µA cm -2(熄灭)到44.1 µA cm -2(点亮),此外,它在开-关循环后表现出很高的稳定性,这是什么?证明NaCe(MoO 4)的适当性能2 / ITO作为用于水分解的光电阳极。
更新日期:2020-12-29
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