am6b01129_si_002.avi (4.37 MB)
Controlled Design of Functional Nano-Coatings: Reduction of Loss Mechanisms in Photoelectrochemical Water Splitting
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posted on 2016-05-09, 15:34 authored by Steve Landsmann, Yuri Surace, Matthias Trottmann, Stefan Dilger, Anke Weidenkaff, Simone PokrantEfficient water splitting
with photoelectrodes requires highly performing and stable photoactive
materials. Since there is no material known which fulfills all these
requirements because of various loss mechanisms, we present a strategy
for efficiency enhancement of photoanodes via deposition of functional
coatings in the nanometer range. Origins of performance losses in
particle-based oxynitride photoanodes were identified and specifically
designed coatings were deposited to address each loss mechanism individually.
Amorphous TiO2 located at interparticle boundaries enables
high electron conductivity. A thin layer of amorphous Ta2O5 can be used as protection layer for photoanodes because
of its hole conductivity and thermal and chemical stability. An amorphous
layer of NiOx and Co(OH)2 reduces
photocorrosion or increases water oxidation kinetics because they
act as a hole-capture material or water oxidation catalyst, respectively.
Crystalline CoOx nanoparticles increase
photocurrent and reduce the onset potential due to enhanced charge
separation. The combination of all coatings deposited by a scalable,
mild, and reproducible step-by-step approach leads to high-performance
oxynitride-based photoanodes providing a maximum photocurrent of 2.52
mA/cm2 at 1.23 VRHE under AM1.5G illumination.
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protection layerwater oxidation catalystchemical stabilityPhotoelectrochemical Water Splitting Efficient water splittingloss mechanismhole conductivityTa 2 O 5photoactive materialsperformance losses1.23 V RHELoss MechanismsControlled Designelectron conductivitynanometer rangecharge separationNiO xcoatingAmorphous TiO 2AM 1.5G illuminationphotoanodeCrystalline CoO x nanoparticles increase photocurrentinterparticle boundariesloss mechanismsincreases water oxidation kineticsefficiency enhancement
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