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Effect of morphology and impact of the electrode/electrolyte interface on the PEC response of Fe2O3 based systems – comparison of two preparation techniques

机译:电极/电解质界面形态和影响对Fe2O3基系统PEC响应的影响 - 两种制备技术的比较

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The present study is a comparative account of Fe _(2) O _(3) based photoelectrodes prepared by two different techniques, namely spray pyrolysis and electrochemical deposition, followed by photoelectrochemical analysis at pH 13 (highly alkaline) and pH 8 (near neutral) in 0.1 M NaOH solution for solar hydrogen generation. The study also investigates the influence of morphology at the semiconductor electrode/electrolyte interface along with quantitative determination of the morphological parameters of the rough electrode surface affecting the photoelectrochemical response using power spectral density analysis. Studies revealed that the Fe _(2) O _(3) sample (E_100cy) prepared with 100 cycles of electrochemical deposition showed the highest photocurrent density of 2.37 mA cm ~(?2) and 1.18 mA cm ~(?2) at 1 V vs. SCE at pH 13 and 8 respectively. Power spectral density analysis exhibited that E_100cy possesses smallest surface features contributing to the PEC response with a lower cut off length scale of 17.23, upper cut off length scale of 150.45, maximum fractal dimension of 2.62 and maximum average rms roughness of 17.52 nm, offering the maximum surface area for charge transfer reactions at the electrode/electrolyte interface. The sample E_100cy exhibited the highest ABPE of 1.29% and IPCE of 37.5%.
机译:本研究是由两种不同技术制备的基于Fe _(2)O _(3)的光电系的比较叙述,即喷雾热解和电化学沉积,然后在pH13(高碱性)和pH8(中性附近)的光电化学分析(接近中性)在0.1米的太阳能发电溶液中。该研究还研究了使用功率谱密度分析影响光电化学响应的粗糙电极表面的形态参数的定量测定。研究表明,用100个电化学沉积制备的Fe _(2)O _(3)样品(E_100cy)显示出最高光电流的光电流密度为2.37 mA cm〜(Δ2)和1.18 mA cm〜(Δ2)。 v分别在pH 13和8处的vs. sce。功率谱密度分析表明,E_100cy具有最小的表面特征,其具有较低的截止值率为17.23的截止值率为17.23,上切断长度为150.45,最大分形尺寸为2.62,最大平均rms粗糙度为17.52nm,提供电荷/电解质界面处的电荷转移反应的最大表面积。样品e_100cy展示了1.29%的最高ABPE,IPCE为37.5%。

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