Plasma-chemical reduction of iron oxide photoanodes for efficient solar hydrogen production
Plasma-chemical reduction of iron oxide photoanodes for efficient solar hydrogen production
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DOI：
10.1016/j.ijhydene.2014.01.080
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发表时间：
2014-03-26
影响因子：
7.2
通讯作者：
Mathur, Sanjay
中科院分区：
文献类型：
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作者：
Mettenboerger, Andreas;Singh, Trilok;Mathur, Sanjay
我们证明了氢等离子体处理对赤铁矿膜的影响，作为一种简单有效的策略，用于修改现有的基板，以显着提高带边位置和光电化学（PEC）性能。XPS和拉曼光谱分析表明，经等离子体处理的Fe_2O_3薄膜由Fe_3O_4：α-Fe_2O_3混合相组成，具有较高的吸收截面，是一种很有前途的光电极材料。经处理的样品显示出增强的光电流密度，在1.8V/RHE下最大为3.5mA/cm（2），并且光电流起始电位从1.68VRHE（未处理）移动到1.28VRHE（处理）。非平衡条件下的氢等离子体处理诱导的Fe中心之间的价态动力学在次表面区域中，维持通过在赤铁矿晶格中的氢的掺入支持的密度泛函理论计算。版权所有（C）2014，氢能出版物有限责任公司。由爱思唯尔有限公司出版。保留所有权利。
We demonstrate the effect of hydrogen plasma treatment on hematite films as a simple and effective strategy for modifying the existing substrate to improve significantly the band edge positions and photoelectrochemical (PEC) performance. Plasma treated hematite films were consist of mixed phases (Fe3O4:alpha-Fe2O3) which was confirmed by XPS and Raman analysis, treated films also showed higher absorption cross-section and were found to be a promising photoelectrode material. The treated samples showed enhance photocurrent densities with maximum of 3.5 mA/cm(2) at 1.8 V/RHE and the photocurrent onset potentials were shifted from 1.68 VRHE (untreated) to 1.28 VRHE (treated). Hydrogen plasma treatment under non-equilibrium conditions induced a valence dynamics among Fe centers in the sub-surface region that was sustained by the incorporation of hydrogen in the hematite lattice as supported by the density functional theory calculations. Copyright (C) 2014, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.