Heterojunction Cr2O3/CuO: Ni photocathodes for enhanced photoelectrochemical performance

Siti Nur Farhana Mohd Nasir, Mohd Khairul Najib Yahya, Norfaizzatul Wahidah Mohamad Sapian, Norasikin Ahmad Ludin, Mohd. Adib Ibrahim, Kamaruzzaman Sopian, Mohd Asri Mat Teridi

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Abstract

Heterojunction p-type photoelectrodes consisting of chromium oxide (Cr2O3) and copper oxide (CuO)-doped nickel (Ni) were prepared using aerosol-assisted chemical vapour deposition (AACVD) and spin-coating. All samples were photoresponsive and showed a photocathodic current in 0.5 M Na2SO4 under simulated solar illumination. The photocathode with an optimal composition of 3 layers of CuO and 0.5% Ni showed an enhanced photoactivity relative to bare Cr2O3. Based on the optical characterization and the flatband potential calculation, the fabricated Cr2O3, Cr2O3/CuO and Cr2O3/CuO:Ni can absorb visible light, which enables the water reduction reaction. Moreover, electrochemical impedance spectroscopy revealed that the charge transfer resistance of Cr2O3/CuO:Ni was decreased. Thus, in the heterojunction structure, the photogenerated electrons in Cr2O3 were transferred to the CuO:Ni layer, which then contributes to a high photoactivity. The combined advantages of the two strategies (heterojunction and doping) provide favourable charge transport characteristics of the materials.

Original languageEnglish
Pages (from-to)56885-56891
Number of pages7
JournalRSC Advances
Volume6
Issue number62
DOIs
Publication statusPublished - 2016

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Photocathodes
Nickel
Heterojunctions
Charge transfer
Copper oxides
Spin coating
Aerosols
Electrochemical impedance spectroscopy
Chemical vapor deposition
Chromium
Lighting
Doping (additives)
Oxides
Electrons
Water
Chemical analysis

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Chemistry(all)

Cite this

Heterojunction Cr2O3/CuO : Ni photocathodes for enhanced photoelectrochemical performance. / Mohd Nasir, Siti Nur Farhana; Yahya, Mohd Khairul Najib; Mohamad Sapian, Norfaizzatul Wahidah; Ahmad Ludin, Norasikin; Ibrahim, Mohd. Adib; Sopian, Kamaruzzaman; Mat Teridi, Mohd Asri.

In: RSC Advances, Vol. 6, No. 62, 2016, p. 56885-56891.

Research output: Contribution to journalArticle

Mohd Nasir, Siti Nur Farhana ; Yahya, Mohd Khairul Najib ; Mohamad Sapian, Norfaizzatul Wahidah ; Ahmad Ludin, Norasikin ; Ibrahim, Mohd. Adib ; Sopian, Kamaruzzaman ; Mat Teridi, Mohd Asri. / Heterojunction Cr2O3/CuO : Ni photocathodes for enhanced photoelectrochemical performance. In: RSC Advances. 2016 ; Vol. 6, No. 62. pp. 56885-56891.
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