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Sains Malaysiana 54(2)(2025): 505-515
http://doi.org/10.17576/jsm-2025-5402-16
Perbandingan Aktiviti Fotoelektrokimia Busa Logam Nikel Selepas Olahan Haba dan Disalut dengan FE2O3 bagi Aplikasi Pembelahan Molekul Air
(Comparison of Photoelectrochemical Activities
of Nickel Metal Foam After Heat Treatment and Coated with FE2O3 for Water Molecule Splitting Applications)
NORADIBA
NORDIN1, NUR AZLINA ADRIS1, LORNA JEFFERY MINGGU1,*, KHUZAIMAH ARIFIN1, ROZAN MOHAMAD
YUNUS1, MOHAMAD AZUWA MOHAMED1,2, SHARIFAH NAJIHA
TIMMIATI1, WONG WAI YIN1 & MOHAMMAD B. KASSIM1,2
1Institut Sel Fuel, Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor, Malaysia
Received: 27 June
2023/Accepted: 14 November 2024
Abstrak
Pembelahan air secara fotoelektrokimia menggunakan tenaga cahaya yang diserap oleh fotoelektrod untuk menghasilkan elektron dan lohong yang membelah molekul air kepada hidrogen dan oksigen. Bahan fotoelektrod dalam kajian ini disediakan melalui proses elektroendapan Fe2O3 di atas busa logam nikel (Ni-busa). Pembentukan NiO secara in-situ di atas Ni-busa semasa penyepuhlindapan udara menjadikannya serasi dengan Fe2O3 dan meningkatkan prestasi bahan fotoelektrod. Ketumpatan arus maksimum pada pincang voltan 1.2 V bagi Ni-busa kosong, Ni-busa olahan-haba dan Fe2O3/Ni-busa adalah 290, 150 dan 275
mA/cm2 dengan anggaran penghasilan hidrogen sebanyak 1.5, 0.8 dan 1.4 μmol/s. Fotoarus bagi Fe2O3/Ni-busa dan Ni-busa-olahan-haba adalah 20 dan 10
mA/cm2 manakala Ni-busa kosong tidak menunjukkan fotoarus. Arus gelap yang tinggi pada ketiga-tiga sampel menunjukkan aktiviti pemangkinan yang tinggi oleh elektrod berasaskan Ni-busa dalam tindak balas evolusi oksigen (OER). Walaupun Fe2O3/Ni-busa menunjukkan ketumpatan arus maksimum yang sedikit lebih rendah, pengendapan Fe2O3 mengurangkan pengoksidaan Ni dan penyinaran cahaya meningkatkan ketumpatan arus keseluruhan Fe2O3/Ni-busa hampir dengan Ni-busa kosong.
Kata kunci: Busa nikel; filem nipis Fe2O3/Ni-busa; fotoelektrokimia pembelahan air; kaedah elektroendapan; penghasilan fotoarus
Abstract
Photoelectrochemical
water splitting uses light energy absorbed by photoelectrodes to generate
electrons and holes that split water molecules into hydrogen and oxygen. The
photoelectrodes in this study were prepared by electrodeposition of Fe2O3 onto nickel foam (Ni-foam). The in‑situ formation of NiO on Ni-foam during air annealing makes it compatible
with Fe2O3 and enhances the performance of the
photoelectrode material. The maximum current density at bias voltage of 1.2 V
for Ni-foam-blank, Ni-foam-blank-annealed and Fe2O3/Ni-foam
is 290, 150, and 275 mA/cm2, with estimated hydrogen production
rates of 1.5, 0.8, and 1.4 μmol/s, respectively.
The photocurrent for Fe2O3/Ni-foam and
Ni-foam-blank-annealed is 20 and 10 mA/cm2, while Ni-foam-blank
shows no photocurrent. The high dark current in all three samples indicates
strong catalytic activity by Ni-foam based electrode in the oxygen evolution
reaction (OER). Although Fe2O3/Ni-foam exhibits a
slightly lower maximum current density, the deposition of Fe2O3 reduces Ni oxidation and light illumination enhances the overall current
density of Fe2O3/Ni-foam bringing it closer to the
current density of Ni-foam-blank.
Keywords:
Electrodeposition method; Fe2O3 thin film; nickel foam;
photocurrent generation; photoelectrochemical water splitting
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