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首页> 外文期刊>Journal of industrial and engineering chemistry >The influence of water-induced crystallization on the photoelectrochemical properties of porous anodic tin oxide films
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The influence of water-induced crystallization on the photoelectrochemical properties of porous anodic tin oxide films

机译：水诱导结晶对多孔阳极氧化锡膜光电子化学性能的影响

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Nanoporous SnOx films with ultra-small channels (<20 nm in diameter) were synthesized by one-step anodic oxidation of Sn foil in 1 M sodium hydroxide. Then, as-prepared materials were immersed in distilled water for various durations (2-120 h) to find out whether a simple soaking process can affect the photoelectrochemical performance of such kind of photoanodes. It was confirmed that during exposure to water, spontaneous crystallization of the amorphous SnOx matrix into rutile-type SnO2 occurs via a dissolution-redeposition process, which results in a gradual loss of the initial porous morphology and thinning of the anodic film. Moreover, due to the formation of less defective, more stoichiometric, and crystalline SnO2-x, gradual widening of the semiconductor band gap, the cathodic shift of the flat band and onset potentials, as well as decrease in the donor density are observed. All these factors are the reason for the significant deterioration of the photoelectrochemical performance of SnOx photoanodes during their exposure to water. Therefore, it was confirmed that even slight differences in the experimental procedure, especially sample washing, drying, and storage, can result in meaningful changes in the composition, and the photoelectrochemical properties of anodically generated tin oxide films. (C) 2020 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
机译：通过1M氢氧化钠中的Sn箔的一步阳极氧化，合成具有超小通道（直径<20nm的直径）的纳米孔SNOX薄膜。然后，将制备的材料浸入蒸馏水中，用于各种持续时间（2-120小时），以了解简单的浸泡过程是否会影响这种光池种的光电化学性能。证实，在暴露于水期间，通过溶解 - 再沉积工艺在暴露于水中，使无定形Snox基质的自发结晶到金红石型SnO 2中，这导致初始多孔形态的逐渐丧失阳极膜的初始多孔形态和变薄。此外，由于形成更少有缺陷，更加化学计量和结晶的SnO2-X，半导体带隙的逐渐加宽，平板带和发作电位的阴极偏移以及发作电位，以及供体密度的降低。所有这些因素都是在暴露于水中Snox光阳极光电化学性能的显着恶化的原因。因此，证实甚至在实验程序中甚至轻微差异，特别是样品洗涤，干燥和储存，可以导致组合物的有意义的变化，以及阳极产生的氧化锡膜的光电化学性质。 （c）2020朝鲜工业与工程化学学会。 elsevier b.v出版。保留所有权利。

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