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首页> 外文期刊>Catalysis science & technology >Effect of Sn-self diffusionviaH(2)treatment on low temperature activation of hematite photoanodes
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Effect of Sn-self diffusionviaH(2)treatment on low temperature activation of hematite photoanodes

机译：影响Sn-self diffusionviaH(2)治疗低赤铁矿光电阳极的活化温度

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摘要

The objective of this study was to report the preparation of a highly efficient hematite nanorod photoanode by H(2)treatment of the beta-FeOOH nanorod with subsequent quenching in air at lower temperature activation for photoelectrochemical (PEC) water oxidation. The hematite nanorod photoanode (H650) prepared by thermally treating the beta-FeOOH nanorod at 360 degrees C for 1 h under H(2)flow and quenching at 650 degrees C for 10 min in air exhibited a remarkable photocurrent of 1.17 mA cm(-2)at 1.23 Vvs.RHE, which was 20 times higher than that of hematite quenched at the same temperature without H(2)treatment. Such enhanced PEC performance was attributed to high Sn(4+)diffusion from the fluorine doped SnO2(FTO) substrateviaH(2)treatment and Sn(4+)doping by subsequent lower temperature quenching. Our density functional theory (DFT) calculation supports our experimental results and proposed mechanism in that the Sn replacement reaction of magnetite (Fe3O4, H-2-reduced beta-FeOOH) occurs at a lower temperature and requires a smaller energy than that of akaganeite (beta-FeOOH).
机译：本研究的目的是报告制备一种高效赤铁矿奈米棒光电阳极的H(2)治疗与后续淬火beta-FeOOH奈米棒空气温度较低的激活光电化学(压电)水氧化。赤铁矿奈米棒光电阳极(H650)准备的热治疗beta-FeOOH奈米棒,享年360岁度1 h下h(2)流和淬火650摄氏度10分钟在空气中展出马的光电流1.17厘米(2)为1.23Vvs。赤铁矿在同一温度淬火H(2)治疗。归因于高Sn(4 +)的扩散氟掺杂SnO2 (FTO)substrateviaH(2)治疗和Sn(4 +)掺杂随后的淬火温度较低。密度泛函理论(DFT)计算支持我们的实验结果和建议Sn置换反应的机制磁铁矿(Fe3O4 H-2-reduced beta-FeOOH)发生在较低的温度下,需要一个更小的能量比四方纤铁矿(beta-FeOOH)。

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