Recent advances on state-of-the-art copper (I/II) oxide as photoelectrode for solar green fuel generation

Challenges and mitigation strategies

Mohd Nur Ikhmal Salehmin, Lorna Effery Minggu, Arifin Khuzaimah, Rozan Mohamad Yunus, Mohamad Azuwa Mohamed, Mohammad Kassim

Research output: Contribution to journalReview article

Abstract

Copper oxide (CuxO) photocathode has received an enormous amount of attention for photoelectrochemical (PEC) green fuel generation, such as hydrogen, methane, ethane, methanol, and ethanol. Although CuxO is highly photoactive, it is limited by the mismatched charge diffusional length and light absorption depth near the band gap. Recent progress on the effort to alleviate this problem is presented in this review, including the state of the art in morphological modulation of CuxO as a photocathode. While the issue associated with the incongruity of semiconductor property is progressively manageable, another issue related to stability in photoelectrochemical hydrogen evolution reaction (PEC-HER) is rather challenging. Continuous efforts to mitigate the stability issue include multilayer heterojunction, buffer layer, metal doping, and chemical bias. Conversely, the PEC reduction of CO2 (PECRC) is proven to encourage the stability of CuxO because of the reversible phase phenomenon. However, the efficiency remains low owing to the competitive reaction with the hydrogen evolution reaction. Efforts to mitigate this issue are in progress and are also reviewed in this work. A recent PEC performance of all oxide nanostructured CuxO set a new benchmark at par with Cu-based complex heterojunction and a noble metal–toxic element incorporated type of photoelectrode. A low-cost material and fabrication technique for a highly photoactive and stable CuxO photocathode film are expected to be realized for this green application in the near future.

Original languageEnglish
Article number117104
JournalApplied Catalysis A: General
Volume582
DOIs
Publication statusPublished - 25 Jul 2019

Fingerprint

Photocathodes
Oxides
Copper
Hydrogen
Heterojunctions
Ethane
Copper oxides
Methane
Buffer layers
Light absorption
Methanol
Multilayers
Energy gap
Ethanol
Metals
Doping (additives)
Modulation
Semiconductor materials
Fabrication
Costs

Keywords

  • Carbon dioxide reduction
  • Hydrogen evolution reaction
  • Nanostructured copper (I/II) oxide
  • Photoelectrochemical
  • Solar fuel generation

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology

Cite this

Recent advances on state-of-the-art copper (I/II) oxide as photoelectrode for solar green fuel generation : Challenges and mitigation strategies. / Salehmin, Mohd Nur Ikhmal; Effery Minggu, Lorna; Khuzaimah, Arifin; Mohamad Yunus, Rozan; Mohamed, Mohamad Azuwa; Kassim, Mohammad.

In: Applied Catalysis A: General, Vol. 582, 117104, 25.07.2019.

Research output: Contribution to journalReview article

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