Cobalt sulfide as photoelectrode of photoelectrochemical hydrogen generation from water
This study aimed to synthesize and characterize cobalt sulfide deposited on FTO by hydrothermal method and investigate its photoelectrochemical (PEC) water splitting performance. Cobalt sulfide thin films were produced by annealing at two different temperatures, namely, 400 and 500 °C. X-ray diffr...
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Main Authors: | , , , |
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Format: | Article |
Language: | English |
Published: |
Penerbit Universiti Kebangsaan Malaysia
2020
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Online Access: | http://journalarticle.ukm.my/16177/1/24.pdf http://journalarticle.ukm.my/16177/ https://www.ukm.my/jsm/malay_journals/jilid49bil12_2020/KandunganJilid49Bil12_2020.html |
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Summary: | This study aimed to synthesize and characterize cobalt sulfide deposited on FTO by hydrothermal method and
investigate its photoelectrochemical (PEC) water splitting performance. Cobalt sulfide thin films were produced by
annealing at two different temperatures, namely, 400 and 500 °C. X-ray diffraction (XRD) and Fourier transform Raman
spectroscopy were used to characterize the phase structure. Scanning electron microscopy was used to observe the
morphology. Ultraviolet-visible spectroscopy and linear sweep voltammetry analyses were used to determine the thinfilm band gap and evaluate the PEC water splitting performance, respectively. From the XRD and Raman analyses,
all the samples produced consisted of mixed phases of Co3
S4
and Co9
S8
. However, each sample contained different
percentage phases. The sample annealed at 400 °C contained more Co9
S8
, whereas that annealed at 500 °C contained
comparable amounts of Co3
S4
and Co9
S8
. The morphologies of pre-annealed samples showed vertical flakes with
diameters around 200-250 nm and flake thickness around 25-50 nm. When the temperature was increased from preannealing temperature to 400 and 500 °C, several flakes were destructed and formed spherical-like clusters. The Tauc
plot from absorption analysis showed that the samples annealed at 400 and 500 °C produced similar band gaps at ~2.0
eV. The PEC performance analysis results show that annealing at 400 °C produced the highest photocurrent density of
10 µA/cm2
at a potential of -0.7 V. |
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