Probing the photoelectrochemical properties of hematite (α-Fe2O3) electrodes using hydrogen peroxide as a hole scavenger

被引：938

作者：

Dotan, Hen ^{[1
,2
]}

Sivula, Kevin ^{[2
]}

Graetzel, Michael ^{[2
]}

Rothschild, Avner ^{[1
]}

Warren, Scott C. ^{[2
]}

机构：

[1] Technion Israel Inst Technol, Fac Mat Engn, Haifa, Israel

[2] Ecole Polytech Fed Lausanne, Lab Photon & Interfaces, CH-1015 Lausanne, Switzerland

来源：

ENERGY & ENVIRONMENTAL SCIENCE | 2011年 / 4卷 / 03期

关键词：

IRON-OXIDE; SEMICONDUCTOR ELECTRODES; WATER; FILMS; MECHANISM; ELECTROLYSIS; REDUCTION; OXIDATION; BEHAVIOR; GAAS;

D O I：

10.1039/c0ee00570c

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

We study hematite (alpha-Fe2O3) photoelectrodes for water splitting by examining the fate of photogenerated holes. Using H2O2 as an efficient hole scavenger, we collect all holes that arrive at the electrode/electrolyte interface. This provides the ability to distinguish between and quantify bulk and surface recombination processes involved in the photoelectrochemical oxidation of water. Below 1.0 V-RHE, electrolyte oxidation kinetics limits the performance but above 1.2 V-RHE bulk recombination becomes the limiting factor.

引用

页码：958 / 964

页数：7

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