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Journal of Industrial and Environmental Chemistry
|
Volume 2
GREEN CHEMISTRY &
TECHNOLOGY
7
th
International Conference on
J u n e 1 8 - 2 0 , 2 0 1 8 | D u b l i n , I r e l a n d
Kyo-Seon Kim et al., J Ind Environ Chem 2018, Volume 2 | DOI: 10.4066/2591-7331-C1-003
EFFICIENT PHOTOELECTROCHEMICAL
WATER OXIDATION BY COBALT
PHOSPHATE MODIFIED COMPOSITE
Kyo-Seon Kim, Tangnuer Sadike
and
Jin-Rui Ding
Kangwon National University, South Korea
P
hotoelectrochemical (PEC) water splitting is considered as one of the
most promising approaches to convert solar energy into hydrogen
energy. It involves hydrogen evolution reaction and oxygen evolution
reaction (OER) and OER is a kinetically more difficult reaction. WO
3
nanowire has attracted much attention due to its favorable valence
band position for water oxidation, better electron transport property and
chemical stability. Moreover, BiVO
4
is a promising photoanode with its
opticalbandgapforvisiblelightabsorptionandcanformtheheterojunction
structure with WO
3
to complement each other’s advantages. Through
this configuration, charge separation efficiency is highly enhanced with
reduced recombination rate. Besides, it is also important to improve
charge reaction kinetics at the electrode and electrolyte interface by
applying oxygen evolution catalysts (OEC). A simple and effective earth-
abundant catalyst known as cobalt phosphate (Co-Pi) was discovered as
oxygen evolution catalysts by Nocera and coworkers and was applied to
improve the photoanode performances. We studied the effect of Co-Pi on
WO
3
/BiVO
4
composite photoanode. The nanostructure WO
3
was prepared
by flame vapor deposition (FVD) and was coated by BiVO
4
using spin
coating method. The Co-Pi OEC is deposited onto the WO
3
photoanode
and WO
3
/BiVO
4
(core-shell) heterojunction structure, respectively, by
photo-assisted electrodeposition method. When Co-Pi was deposited on
WO
3
/BiVO
4
, the onset potential was shifted negatively accompanied with
increased photocurrent, while Co-Pi on WO
3
didn’t show such significant
improvement.
Kyo-Seon Kim is currently a Professor of Chemi-
cal Engineering at Kangwon National University,
Chuncheon, South Korea, where he has been
working from 1989. He received his BS, MS and
PhD degrees all in Chemical Engineering from
Seoul National University, KAIST and University
of Cincinnati, OH, USA in 1979, 1981 and 1989,
respectively. His research interests are main-
ly focused on preparation and modification of
nanoparticles for high-functional performanc-
es. The main applications of nanoparticles in
his researches are in the fields of air pollution
control, energy harvesting and development of
medical devices.
kkyoseon@kangwon.ac.krBIOGRAPHY