Sains Malaysiana 47(7)(2018): 1511–1516
http://dx.doi.org/10.17576/jsm-2018-4707-19
Kesan Resonans
Plasmon Aurum terhadap Prestasi
Fotoelektrokimia Fotokatod
Cu2O
(Plasmonic Resonance
Effect of Aurum on Photoelectrochemical
Performance of Cu2O Photocathode)
KIM HANG
NG1,
LORNA
JEFFERY
MINGGU1*,
NURUL
AKMAL
JAAFAR1
& MOHAMMAD B. KASSIM2
1Institut Sel
Fuel, Universiti Kebangsaan Malaysia,
43600 UKM Bangi, Selangor Darul Ehsan, Malaysia
2Pusat Pengajian
Sains Kimia dan
Teknologi Makanan, Fakulti Sains dan
Teknologi, Universiti
Kebangsaan Malaysia, 43600 UKM Bangi, Selangor Darul Ehsan, Malaysia
Diserahkan: 30 Jun 2017/Diterima:
19 Februari 2018
ABSTRAK
Dalam kajian ini,
kesan lapisan Au di atas fotokatod kuprus oksida (Cu2O)
terhadap tindak
balas fotoelektrokimia telah diuji. Lapisan Cu2O
dan Au ini telah disediakan di atas subtrak kaca
stanum oksida
terdop fluorin (FTO)
dalam konfigurasi yang berlainan, melalui kaedah elektroendapan. Selepas itu, fotokatod
ini dicirikan
dengan mikroskopi elektron imbasan berpancaran medan
(FESEM),
spektroskopi ultra lembayung
dan cahaya nampak (UV-Vis) dan
analisis fotoelektrokimia.
Daripada imej FESEM, lapisan
Au telah berjaya
diendapkan di atas substrak FTO dan
permukaan Cu2O.
Penyerapan plasmon
Au pada julat cahaya
nampak juga terbukti
dan ia
telah mempertingkatkan penggunaan cahaya nampak untuk tindak
balas fotoelektrokimia.
Oleh itu, prestasi fotoelektrokimia
fotokatod Cu2O
berplasmon telah
meningkat secara ketara. Di bawah sinaran suria simulasi
A.M 1.5, fotokatod Cu2O
terapit Au telah
menjanakan ketumpatan fotoarus yang tertinggi, iaitu ~4 kali ganda peningkatan berbanding prestasi fotokatod Cu2O
tulen.
Kata kunci:
Fotoelektrokimia; logam
oksida; plasmon
ABSTRACT
In this work, the effect of
Au layer on cuprous oxide (Cu2O) photocathode on photoelectrochemical reaction was studied. The Cu2O
and Au layer were prepared on a fluorine-doped tin oxide (FTO)
glass substrate in different configurations, via electrodeposition
method. Then, the photocathodes were characterized by field-emission
scanning electron microscopy (FESEM), UV-Vis spectroscopy and photoelectrochemical analysis. From the FESEM images,
the Au layer was successfully deposited onto the FTO substrate
and the surface of Cu2O. The plasmonic
absorption of Au at visible light region was proven and it improved
the utilization of visible light for photoelectrochemical
reaction. As a result, the photoelectrochemical
performance of the plasmonized Cu2O
photocathode improved significantly. Under simulated AM 1.5
solar illumination, the Au sandwiched Cu2O
photocathode generated the highest photocurrent density, which is
~4 folds enhancement compared to that obtained by bare Cu2O
photocathode.
Keywords: Metal oxide; photoelectrochemical;
plasmonic
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*Pengarang
untuk surat-menyurat:
email: lorna_jm@ukm.edu.my
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