Nanostructured Ternary FeCrAl Oxide Photocathodes for Water Photoelectrolysis

被引：12

作者：

Kondofersky, Ilina ^{[1
,2
]}

Mueller, Alexander ^{[1
,2
,3
]}

Dunn, Halina K. ^{[1
,2
]}

Ivanova, Alesja ^{[1
,2
]}

Stefanic, Goran ^{[4
]}

Ehrensperger, Martin ^{[1
,2
]}

Scheu, Christina ^{[3
]}

Parkinson, Bruce A. ^{[5
,6
]}

Fattakhova-Rohlfing, Dina ^{[1
,2
]}

Bein, Thomas ^{[1
,2
]}

机构：

[1] Univ Munich, Dept Chem, Butenandtstr 5-13 E, D-81377 Munich, Germany

[2] Univ Munich, Ctr NanoSci CeNS, Butenandtstr 5-13 E, D-81377 Munich, Germany

[3] Max Planck Inst Eisenforsch GmbH, Max Planck Str 1, D-40237 Dusseldorf, Germany

[4] Rudjer Boskovic Inst, Div Mat Chem, POB 180, Zagreb 10002, Croatia

[5] Univ Wyoming, Dept Chem, 1000 East Univ Ave, Laramie, WY 82071 USA

[6] Univ Wyoming, Sch Energy Resources, 1000 East Univ Ave, Laramie, WY 82071 USA

来源：

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 2016年 / 138卷 / 06期

关键词：

THERMAL-DECOMPOSITION; COMBINATORIAL DISCOVERY; HEMATITE PHOTOANODES; CR; FE; PERFORMANCE; THICKNESS; OXIDATION; OPAL; AL;

D O I：

10.1021/jacs.5b08040

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

A sol-gel method for the synthesis of semiconducting FeCrAl oxide photocathodes for solar-driven hydrogen production was developed and applied for the production of meso- and macroporous layers with the overall stoichiometry Fe0.84Cr1.0Al0.16O3. Using transmission electron microscopy and energy-dispersive X-ray spectroscopy, phase separation into Fe- and Cr-rich phases was observed for both morphologies. Compared to prior work and to the mesoporous layer, the macroporous FeCrAl oxide photocathode had a significantly enhanced photo electrolysis performance, even at a very early onset potential of 1.1 V vs RHE. By optimizing the macroporous electrodes, the device reached current densities of up to 0.68 mA cm(-2) at 0.5 V vs RHE under AM 1.5 with an incident photon-to-cur-rent efficiency (IPCE) of 28% at 400 nm without the use of catalysts. Based on transient measurements, this performance increase could be attributed to an improved collection efficiency. At a potential of 0.75 V vs RHE, an electron transfer efficiency of 48.5% was determined.

引用

页码：1860 / 1867

页数：8