Decoupling Feature Size and Functionality in Solution-Processed, Porous Hematite Electrodes for Solar Water Splitting

被引：287

作者：

Brillet, Jeremie ^{[1
]}

Gratzel, Michael ^{[1
]}

Sivula, Kevin ^{[1
]}

机构：

[1] Ecole Polytech Fed Lausanne, Lab Photon Interfaces, Inst Sci & Ingn Chim, CH-1015 Lausanne, Switzerland

来源：

NANO LETTERS | 2010年 / 10卷 / 10期

关键词：

Iron oxide; nanostructured electrodes; photoelectrochemical energy storage; sintering; confinement; mesoporous silica; THIN-FILMS; ALPHA-FE2O3; OXIDE; PHOTOOXIDATION; PHOTOELECTROCHEMISTRY; PHOTOANODE; DEPOSITION; FE2O3;

D O I：

10.1021/nl102708c

中图分类号：

O6 [化学];

学科分类号：

070301 [无机化学];

摘要：

We introduce a simple solution-based strategy to decouple morphological and functional effects of annealing nanostructured, porous electrodes by encapsulation with a SiO2 confinement scaffold before high temperature treatment We demonstrate the effectiveness of this approach using porous hematite (alpha-Fe2O3) photoanodes applied for the storage of solar energy via water splitting and show that the feature size and electrode functionality due to dopant activation can be independently controlled This allows a significant increase in water oxidation photocurrent from 1 57 mA cm(-2) (in the control case) to 2 34 mA cm(-2) under standard illumination conditions in 1 M NaOH electrolyte the highest reported for a solution-processed hematite photoanode This increase is attributed to the improved quantum efficiency, especially with longer wavelength photons, due to a smaller particle size, which is afforded by our encapsulation strategy

引用

页码：4155 / 4160

页数：6

共 32 条

[1]

Facile Fabrication of an Efficient Oxynitride TaON Photoanode for Overall Water Splitting into H2 and O2 under Visible Light Irradiation [J].