Seed-Assisted Synthesis of Ni(OH)2 Nanosheets on InGaN Films as Photoelectrodes toward Solar-Driven Water Splitting

Yu Tsun Yao, Ting Wei Huang, Yung Lan Chuang, Ming Lun Lee, Jinn Kong Sheu

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

In this study, we conducted photoelectrochemical (PEC) water-splitting reactions using indium gallium nitride (InGaN) as photoelectrodes to extend light absorption from ultraviolet to visible wavelengths. However, the bare InGaN films experience significant photocorrosion due to numerous defects resulting from the substantial lattice mismatches between GaN and InGaN. While Ni(OH)2 nanosheets, prepared through a hydrothermal method and decorated on the InGaN photoelectrodes, show promise in mitigating photocorrosion, incomplete coverage of Ni(OH)2 on the InGaN photoelectrodes leads to corrosion in the uncovered areas. To enhance the coverage of Ni(OH)2 nanosheets on InGaN-based photoelectrodes, we synthesized Ni(OH)2 nanosheets using a NiO nanofilm as the seed layer. Experimental results demonstrate that photoelectrodes made of the Ni(OH)2/NiO/InGaN composite films exhibit superior PEC performance compared to that of NiO-free InGaN photoelectrodes. Additionally, after stability tests, no significant photocorrosion was observed on the Ni(OH)2-coated InGaN surface with the NiO seed layer while achieving higher photocurrents and increased hydrogen production rates. The Ni(OH)2/NiO/InGaN photoelectrodes exhibit approximately 30% enhancement in photocurrents compared to the bare InGaN films.

Original languageEnglish
Pages (from-to)9516-9522
Number of pages7
JournalACS Applied Energy Materials
Volume6
Issue number18
DOIs
Publication statusPublished - 2023 Sept 25

All Science Journal Classification (ASJC) codes

  • Chemical Engineering (miscellaneous)
  • Energy Engineering and Power Technology
  • Electrochemistry
  • Materials Chemistry
  • Electrical and Electronic Engineering

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