Water
Splitting Exceeding 17% Solar-to-Hydrogen Conversion
Efficiency Using Solution-Processed Ni-Based Electrocatalysts and
Perovskite/Si Tandem Solar Cell
Posted on 2019-09-03 - 20:43
Various noble metal-free
electrocatalysts have been explored to
enhance the overall water splitting efficiency. Ni-based compounds
have attracted substantial attention for achieving efficient oxygen
evolution reaction (OER) and hydrogen evolution reaction (HER) catalysts.
Here, we show superior electrocatalysts based on NiFe alloy electroformed
by a roll-to-roll process. NiFe (oxy)hydroxide synthesized by an anodization
method for the OER catalyst shows an overpotential of 250 mV at 10
mA cm–2, which is dramatically smaller than that
of bare NiFe alloy with an overpotential of 380 mV at 10 mA cm–2. Electrodeposited NiMo films for the HER catalyst
also exhibit a small overpotential of 100 mV at 10 mA cm–2 compared with that of bare NiFe alloy (550 mV at 10 mA cm–2). A combined spectroscopic and electrochemical analysis reveals
a clear relationship between the surface chemistry of NiFe (oxy)hydroxide
and the water splitting properties. These outstanding fully solution-processed
catalysts facilitate superb overall water splitting properties due
to enlarged active surfaces and highly active catalytic properties.
We combined a solution-processed monolithic perovskite/Si tandem solar
cell with MAPb(I0.85Br0.15)3 for
the direct conversion of solar energy into hydrogen energy, leading
to the high solar-to-hydrogen efficiency of 17.52%. Based on the cost-effective
solution processes, our photovoltaic–electrocatalysis (PV-EC)
system has advantages over latest high-performance solar water splitting
systems.
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Park, Hoonkee; Park, Ik Jae; Lee, Mi Gyoung; Kwon, Ki Chang; Hong, Seung-Pyo; Kim, Do Hong; et al. (2019). Water
Splitting Exceeding 17% Solar-to-Hydrogen Conversion
Efficiency Using Solution-Processed Ni-Based Electrocatalysts and
Perovskite/Si Tandem Solar Cell. ACS Publications. Collection. https://doi.org/10.1021/acsami.9b09344
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AUTHORS (19)
HP
Hoonkee Park
IP
Ik Jae Park
ML
Mi Gyoung Lee
KK
Ki Chang Kwon
SH
Seung-Pyo Hong
DK
Do Hong Kim
SL
Sol A Lee
TL
Tae Hyung Lee
CK
Changyeon Kim
CM
Cheon Woo Moon
DS
Dae-Yong Son
GJ
Gwan Ho Jung
HY
Hong Seok Yang
JL
Jea Ryung Lee
JL
Jinwoo Lee
NP
Nam-Gyu Park
SK
Soo Young Kim
JK
Jin Young Kim
HJ
Ho Won Jang
KEYWORDS
water splitting efficiencywater splitting propertiesNiFe alloy electroformedelectrochemical analysissolution processeshydrogen energy250 mVsurface chemistryroll-to-roll processHER catalystPV-EC100 mVwater splitting systemsNi-based compoundsSolution-Processed Ni-Based Electrocatalystshydrogen evolution reactionElectrodeposited NiMo filmscmoxygen evolution reactionOER catalystmAoverpotentialsolar-to-hydrogen efficiencysolution-processed catalysts380 mVmetal-free electrocatalystsNiFe alloyanodization method