Plasma-chemical reduction of iron oxide photoanodes for efficient solar hydrogen production

被引：60

作者：

Mettenboerger, Andreas ^{[1
]}

Singh, Trilok ^{[1
]}

Singh, Aadesh P. ^{[1
]}

Jaervi, Tommi T. ^{[2
]}

Moseler, Michael ^{[2
]}

Valldor, Martin ^{[3
]}

Mathur, Sanjay ^{[1
]}

机构：

[1] Univ Cologne, Dept Chem, D-50859 Cologne, Germany

[2] Fraunhofer Inst Mech Mat, D-79108 Freiburg, Germany

[3] Univ Cologne, Inst Expt Phys, D-50937 Cologne, Germany

来源：

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY | 2014年 / 39卷 / 10期

基金：

芬兰科学院;

关键词：

Hematite; Plasma treatment; Solar hydrogen; Photoelectrochemical; PE-CVD; HEMATITE THIN-FILMS; VISIBLE-LIGHT; WATER; GAAS; OXYGEN; NANOSTRUCTURES; ABSORPTION; OXIDATION; SILICON; GROWTH;

D O I：

10.1016/j.ijhydene.2014.01.080

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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.

引用

页码：4828 / 4835

页数：8

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