Electrosynthesis, activation, and applications of nickel-iron oxyhydroxide in (photo-)electrochemical water splitting at near neutral condition

Shih Ching Huang, Chia-Yu Lin

Research output: Contribution to journalArticle

Abstract

We present the anodic pulse-current electrosynthesis, structural characterization, and OER electrocatalytic properties of the pristine and anodically-pretreated nickel-iron oxyhydroxide borate thin films (Fe:Ni–Bi). In the electrosynthesis of Fe:Ni–Bi, OER kinetics was found to have great influence not only on the current efficiency for film deposition, but also on the surface morphology and crystal structure of the synthesized Fe:Ni–Bi. In addition, the Tafel analyses indicate that incorporating iron modified the OER mechanism and promoted the OER activity. Moreover, both the applied turnover (current) and electrolyte pH used in the anodic pretreatment of Fe:Ni–Bi have great influences on the OER activity of the pretreated Fe:Ni–Bi; the applied turnover rate decides the applied oxidative level and thus affects the extent of phase transformation of β-NiOOH to γ-NiOOH, whereas the solution pH for anodic pretreatment affects the electrochemically effective surface area. Finally, the developed electrosynthetic approach can effectively translate the high OER activity of Fe:Ni–Bi from a flat FTO substrate to a porous BiVO4 photoanode, facilitating the interfacial hole transfer and improving photostability of BiVO4.

Original languageEnglish
Article number134667
JournalElectrochimica Acta
Volume321
DOIs
Publication statusPublished - 2019 Oct 20

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Nickel
Chemical activation
Iron
Borates
Water
Electrolytes
Surface morphology
Crystal structure
Phase transitions
Thin films
Kinetics
Substrates
bismuth vanadium tetraoxide
ferric hydroxide

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Electrochemistry

Cite this

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title = "Electrosynthesis, activation, and applications of nickel-iron oxyhydroxide in (photo-)electrochemical water splitting at near neutral condition",
abstract = "We present the anodic pulse-current electrosynthesis, structural characterization, and OER electrocatalytic properties of the pristine and anodically-pretreated nickel-iron oxyhydroxide borate thin films (Fe:Ni–Bi). In the electrosynthesis of Fe:Ni–Bi, OER kinetics was found to have great influence not only on the current efficiency for film deposition, but also on the surface morphology and crystal structure of the synthesized Fe:Ni–Bi. In addition, the Tafel analyses indicate that incorporating iron modified the OER mechanism and promoted the OER activity. Moreover, both the applied turnover (current) and electrolyte pH used in the anodic pretreatment of Fe:Ni–Bi have great influences on the OER activity of the pretreated Fe:Ni–Bi; the applied turnover rate decides the applied oxidative level and thus affects the extent of phase transformation of β-NiOOH to γ-NiOOH, whereas the solution pH for anodic pretreatment affects the electrochemically effective surface area. Finally, the developed electrosynthetic approach can effectively translate the high OER activity of Fe:Ni–Bi from a flat FTO substrate to a porous BiVO4 photoanode, facilitating the interfacial hole transfer and improving photostability of BiVO4.",
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N2 - We present the anodic pulse-current electrosynthesis, structural characterization, and OER electrocatalytic properties of the pristine and anodically-pretreated nickel-iron oxyhydroxide borate thin films (Fe:Ni–Bi). In the electrosynthesis of Fe:Ni–Bi, OER kinetics was found to have great influence not only on the current efficiency for film deposition, but also on the surface morphology and crystal structure of the synthesized Fe:Ni–Bi. In addition, the Tafel analyses indicate that incorporating iron modified the OER mechanism and promoted the OER activity. Moreover, both the applied turnover (current) and electrolyte pH used in the anodic pretreatment of Fe:Ni–Bi have great influences on the OER activity of the pretreated Fe:Ni–Bi; the applied turnover rate decides the applied oxidative level and thus affects the extent of phase transformation of β-NiOOH to γ-NiOOH, whereas the solution pH for anodic pretreatment affects the electrochemically effective surface area. Finally, the developed electrosynthetic approach can effectively translate the high OER activity of Fe:Ni–Bi from a flat FTO substrate to a porous BiVO4 photoanode, facilitating the interfacial hole transfer and improving photostability of BiVO4.

AB - We present the anodic pulse-current electrosynthesis, structural characterization, and OER electrocatalytic properties of the pristine and anodically-pretreated nickel-iron oxyhydroxide borate thin films (Fe:Ni–Bi). In the electrosynthesis of Fe:Ni–Bi, OER kinetics was found to have great influence not only on the current efficiency for film deposition, but also on the surface morphology and crystal structure of the synthesized Fe:Ni–Bi. In addition, the Tafel analyses indicate that incorporating iron modified the OER mechanism and promoted the OER activity. Moreover, both the applied turnover (current) and electrolyte pH used in the anodic pretreatment of Fe:Ni–Bi have great influences on the OER activity of the pretreated Fe:Ni–Bi; the applied turnover rate decides the applied oxidative level and thus affects the extent of phase transformation of β-NiOOH to γ-NiOOH, whereas the solution pH for anodic pretreatment affects the electrochemically effective surface area. Finally, the developed electrosynthetic approach can effectively translate the high OER activity of Fe:Ni–Bi from a flat FTO substrate to a porous BiVO4 photoanode, facilitating the interfacial hole transfer and improving photostability of BiVO4.

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