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首页> 外文期刊>Catalysis science & technology >Photo-assisted electrodeposition of manganese oxide on TaON anodes: effect on water photooxidation capacity under visible light irradiation
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Photo-assisted electrodeposition of manganese oxide on TaON anodes: effect on water photooxidation capacity under visible light irradiation

机译：Photo-assisted电沉积的锰在TaON阳极氧化:对水的影响可见光下的光致氧化能力辐照

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摘要

The synergistic effect of coupling a photooxidation catalyst, tantalum oxynitride, and manganese oxide (MnOx) as electrooxidation catalyst in multi-component photoanodes for water oxidation is explored in near-neutral solutions under visible light irradiation (lambda > 400 nm). The anodes have been formed by using different electrochemical methods to deposit MnOx on screen-printed TaON films, pre-modified with TiO2 coatings (TiO2-TaON). By using SEM/EDX, ICP-MS analysis of the amount of Mn deposited and, electrochemical techniques, we demonstrate that selective deposition of fine-structured nm-sized MnOx flakes on the photocatalytically active TiO2-TaON surface is achieved when the electrodeposition is carried out under visible light irradiation, but not in the dark. The MnOx/TiO2-TaON anodes produced using the photo-assisted method exhibit improved activity and better long-term stability during water photooxidation under visible light irradiation when compared to the TiO2-TaON films modified with MnOx in dark. A 7-fold enhancement in the oxidative photocurrent densities under voltammetric and chronoamperometric conditions in 0.1 M Na2SO4 (pH = 6) is observed for the films prepared by the photo-assisted method. The Mn-loading in the best performing films is ca. 0.8 wt% and higher loadings were found to lower the photocatalytic activity. Continuous water photooxidation over MnOx/TiO2-TaON anodes in 0.1 M Na2SO4 (pH = 6) at potentials more positive than ca. 1.0 V vs. reversible hydrogen electrode coarsens the fine structure of the MnOx material, and this structural degradation is mirrored in a slow deterioration of the photocatalyst performance.
机译：耦合的协同效应光致氧化催化剂、钽氮氧化物和电氧化锰氧化物(MnOx)在多组分的催化剂光电阳极的水氧化是在接近中度探索解决方案可见光照射下(λ> 400海里)。存款MnOx不同的电化学方法在丝网印刷TaON电影,pre-modified二氧化钛涂层(TiO2-TaON)。icp分析锰沉积的量电化学技术,我们证明选择性沉积的精细结构在保留nm-sized MnOx片活跃TiO2-TaON表面时实现电沉积进行了下可见光照射,但不是在黑暗中。MnOx / TiO2-TaON阳极生产使用photo-assisted方法表现出改进的活动在水和更好的长期稳定可见光照射下光致氧化相比TiO2-TaON电影修改MnOx在黑暗。氧化光电流密度下伏安和chronoamperometric条件0.1 Na2SO4 (pH = 6)是观察到的电影photo-assisted准备的方法。Mn-loading表现最好的电影是ca。高0.8 wt %和低载荷被发现的光催化活性。光致氧化MnOx / TiO2-TaON阳极在0.1M Na2SO4 (pH = 6)更积极的潜力比1.0 V和可逆氢电极变粗MnOx精细结构的材料,和这种结构性退化是一个镜像减缓恶化的光催化剂的性能。

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