TY - JOUR

T1 - Design Rules for Oxygen Evolution Catalysis at Porous Iron Oxide Electrodes

T2 - A 1000-Fold Current Density Increase

AU - Haschke, Sandra

AU - Pankin, Dmitrii

AU - Petrov, Yuri

AU - Bochmann, Sebastian

AU - Manshina, Alina

AU - Bachmann, Julien

PY - 2017/9/22

Y1 - 2017/9/22

N2 - Nanotubular iron(III) oxide electrodes are optimized for catalytic efficiency in the water oxidation reaction at neutral pH. The nanostructured electrodes are prepared from anodic alumina templates, which are coated with Fe2O3 by atomic layer deposition. Scanning helium ion microscopy, X-ray diffraction, and Raman spectroscopy are used to characterize the morphologies and phases of samples submitted to various treatments. These methods demonstrate the contrasting effects of thermal annealing and electrochemical treatment. The electrochemical performances of the corresponding electrodes under dark conditions are quantified by steady-state electrolysis and electrochemical impedance spectroscopy. A rough and amorphous Fe2O3 with phosphate incorporation is critical for the optimization of the water oxidation reaction. For the ideal pore length of 17 μm, the maximum catalytic turnover is reached with an effective current density of 140 μA cm−2 at an applied overpotential of 0.49 V.

AB - Nanotubular iron(III) oxide electrodes are optimized for catalytic efficiency in the water oxidation reaction at neutral pH. The nanostructured electrodes are prepared from anodic alumina templates, which are coated with Fe2O3 by atomic layer deposition. Scanning helium ion microscopy, X-ray diffraction, and Raman spectroscopy are used to characterize the morphologies and phases of samples submitted to various treatments. These methods demonstrate the contrasting effects of thermal annealing and electrochemical treatment. The electrochemical performances of the corresponding electrodes under dark conditions are quantified by steady-state electrolysis and electrochemical impedance spectroscopy. A rough and amorphous Fe2O3 with phosphate incorporation is critical for the optimization of the water oxidation reaction. For the ideal pore length of 17 μm, the maximum catalytic turnover is reached with an effective current density of 140 μA cm−2 at an applied overpotential of 0.49 V.

KW - electrochemistry

KW - iron

KW - nanostructures

KW - oxidation

KW - water splitting

UR - http://www.scopus.com/inward/record.url?scp=85028943544&partnerID=8YFLogxK

U2 - 10.1002/cssc.201701068

DO - 10.1002/cssc.201701068

M3 - Article

C2 - 28745440

AN - SCOPUS:85028943544

VL - 10

SP - 3644

EP - 3651

JO - ChemSusChem

JF - ChemSusChem

SN - 1864-5631

IS - 18

ER -