HIGH THROUGHPUT STUDIES OF HYDROGEN EVOLUTION ELECTROCATALYST FOR WATER ELECTROLYSIS
This thesis presents a study of hydrogen evolution electrocatalyst for alkaline water electrolysis. Hydrogen production through the water electrolysis requires new electrocatalysts development to reduce the hydrogen evolution overpotential of the cathode in order to make water electrolysis more comp...
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| Format: | Thesis |
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[Yogyakarta] : Universitas Gadjah Mada
2013
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| Summary: | This thesis presents a study of hydrogen evolution electrocatalyst for alkaline
water electrolysis. Hydrogen production through the water electrolysis requires
new electrocatalysts development to reduce the hydrogen evolution overpotential
of the cathode in order to make water electrolysis more competitive and efficient.
Pt on TiO2 electrocatalyst has been synthesized by applying highthroughput
PVD method. Electrochemistry measurements of Pt on TiO2 have been used to
study the characteristic and stability of the electrocatalyst for hydrogen evolution
reaction in alkaline electrolyte for water electrolysis. XRD confirmed that the
phase of TiO2 were amorphous and anatase after annealing for 6 hours at the
temperature of 450oC. The thicknesses of TiO2 both for amorphous and anatase
were 200 nm.
Similar electrocatalytic behavior are presented both for Pt on amorpous TiO2
and Pt on anatase TiO2 from electrochemistry measurements using cyclic
voltammetry and potential step on the 10 x 10 E-chem arrays in alkaline
electrolyte (0.5 M NaOH). Higher currents are seen in the larger particle size of
platinum in TiO2 both for amorphous and anatase phase. The hydrogen evolution
reaction starts at the potential below -0.8 V vs SHE. The potential for hydrogen
evolution reaction is shifted to the low potential. Larger particle size of platinum
shows lower potential of hydrogen evolution reaction.
Pt on TiO2 tends to be a stable electrocatalyst for hydrogen evolution reaction
in alkaline water electrolysis. It is because hydrogen evolution reaction occurs at
low potential. Anatase phase of TiO2 is more stable than amorphous TiO2, hence,
Pt on anatase TiO2 is better than Pt on amorphous TiO2 for hydrogen evolution
reaction in alkaline water electrolysis. |
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