Photoelectrochemistry of Porous p-Cu[sub 2]O Films

Engel, Clifford J.; Polson, Thomas A.; Spado, Jacy R.; Bell, Jordan; Fillinger, Akiko

doi:10.1149/1.2830850

Cited by 72 publications

(58 citation statements)

References 23 publications

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“…Some of us reported that the stability and reactivity of electrodeposited Cu 2 O films depends on the crystal orientation. 2 4 Our premise of a [111] oriented Cu 2 O film being predominately O 2− -terminated agrees with their finding. We have reasoned that the useful Cu 2 O surfaces for photo-assisted H 2 production are the ones terminated with O 2− , which attract H + , however, it is necessary to interrupt the direct interaction of O 2− -terminated surface with H + to prevent the decomposition reaction.…”

supporting

confidence: 89%

Deposition of Nickel on Electrodeposited Cu₂O Films at Potentials More Positive than the Nernst Potential of Ni²⁺/Ni⁰

DeHority

Budin

Hilston

et al. 2017

J. Electrochem. Soc.

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Deposition of nickel on electrodeposited Cu 2 O films was investigated at potentials more positive than the estimated Nernst equilibrium potential of Ni 2+ /Ni 0 for the purpose of developing a monolayer deposition method that will act as a protective and catalytic overlayer on the oxide films. Cu 2 O films were subjected to 0.08 mM nickel acetate solutions for 60 s at potentials more positive than the estimated Nernst equilibrium potential of Ni 2+ /Ni 0 . The quantities of Ni recovered from the Cu 2 O films were determined by atomic absorption spectrometry. The oxidation state of Ni deposited on the Cu 2 O was determined to be +3 via X-ray photoelectron spectroscopy. The absence of evidence of reduction of Ni 2+ to Ni 0 suggests that the nature of the nickel deposition is adsorption, and it is not characterized as underpotential deposition. Photoelectrochemical measurements showed that deposited Ni protected Cu 2 O films from the photodecomposition to Cu 0 by interfering with H + binding to the O 2− surface sites, and indicated the possibility of catalytic activity of deposited nickel for H + reduction. The catalytic activity of deposited nickel was explained by the shift of the Cuprous oxide (Cu 2 O) has a relatively small bandgap (2.0 eV) and an approximately 0.7 V more negative conduction band-edge position than the reduction of hydrogen ion, 1 which are favorable characteristics in a photocathode for H 2 production. Some of us reported that the stability and reactivity of electrodeposited Cu 2 O films depends on the crystal orientation. UPD method was considered in order to limit the deposition of the Ni protective coating to a monolayer. UPD, which is deposition of metal at more positive potentials than the reversible Nernst potential, occurs if the bonding energies between the metal adatom and a foreign substrate are stronger than the metal itself.7 UPD results in the formation of a monolayer because energy necessary for the deposition of a successive layer is not available at underpotentials than the reversible * Electrochemical Society Student Member.* * Electrochemical Society Active Member. z E-mail: afillinger@ithaca.edu Nernst potential. Unlike rigorously studied UPD on a metal surface, there are only a few papers regarding UPD on a metal oxide surface. One such example is UPD of Cu on RuO surface. 8 Increased underpotential shift for Cu UPD on the oxide (170 mV) in comparison to Cu UPD on Ru surface (110 mV) was monitored by cyclic voltammetry and X-ray photoelectron spectroscopy. The other example is UPD of Cu on TiO 2 , which was detected at 200 mV more positive potential than Cu bulk deposition by cyclic voltammetry and electrochemical quartz crystal nanobalance techniques.9 The former paper suggests a possible application of Cu UPD to Ru-based platable seedless Cu diffusion barrier, while the latter proposes the use of Cu UPD for the determination of electroactive surface area of oxide electrodes. In this paper we report deposition of Ni on electrodeposited Cu 2 O films at potentials more posi...

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confidence: 89%

Deposition of Nickel on Electrodeposited Cu₂O Films at Potentials More Positive than the Nernst Potential of Ni²⁺/Ni⁰

DeHority

Budin

Hilston

et al. 2017

J. Electrochem. Soc.

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“…In this study, we demonstrate that the same solution can be successfully explored for the formation of densely packed pyramidal-and bi-pyramidal-shaped (octahedral) Cu 2 O crystals onto the thermally oxidized Ti substrate ( Figures 1C and D). The shape of crystallites was found to be dependent on the pH of solution and AC deposition conditions, similar to the case of potentiostatic depositions from the alkaline cupric lactate solution onto the ITO substrate [27]. The pH of solution kept at a pH within 5.2 to 5.35 range was found to be an optimal.…”

Section: Composition and Structure Of Heterostructured Filmssupporting

confidence: 59%

Fabrication by AC Deposition and Antimicrobial Properties of Pyramidal-Shaped Cu₂O-TiO₂ Heterostructures

Žalnėravičius

Paškevičius

Kovger

et al. 2014

Nanomaterials and Nanotechnology

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Nanoparticulate surfaces possessing antimicrobial and fungicidal properties under visible light illumination have found wide applications in a number of fields. In this study, titania nanotubes, as well as titania compact films were designed with pure Cu 2 O crystals in a mildly acidic copper acetate solution using a simple alternating current (AC) deposition approach. In this way, the thermally oxidized Ti substrate was coated by densely packed pyramidal and bipyramidal shaped Cu 2 O crystals with dominant (111) planes and investigated against several types of fungi and bacteria. For comparison, TiO 2 nanotube (TiNT) films were also decorated with similar crystals and tested. The results showed that, compared to bare TiO 2 films, both Cu 2 O-inTiNT and Cu 2 O-on-TiO 2 heterostructures exhibited remarkably enhanced activity against tested fungi and bacteria. We also demonstrated that the high photoactivity of these crystals remained even after 50 h stability tests under bright light illumination. The results obtained from in vitro tests indicated that Cu 2 O-in/on-TiO 2 heterostructures show promise as visible light driven antimicrobial materials.

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“…Among the abundant semiconductors, cuprous oxide (Cu 2 O) has recently attracted extensive attention as a means of solar-to-hydrogen conversion [4][5][6]. In addition to possessing low cost and environmental friendliness, the fascination also comes from its peculiar conduction band lying 0.7 V negative of the hydrogen evolution potential [4,7], which theoretically points out its feasibility to drive the water splitting into hydrogen. In addition, the high theoretical photocurrent of À 14.7 mA cm À 2 and light-to-hydrogen conversion efficiency of 18.7% suggest its huge potential applications in solar hydrogen production [8].…”

Section: Introductionmentioning

confidence: 99%

Freestanding atomically-thin cuprous oxide sheets for improved visible-light photoelectrochemical water splitting

et al. 2014

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Photoelectrochemistry of Porous p-Cu[sub 2]O Films

Cited by 72 publications

References 23 publications

Deposition of Nickel on Electrodeposited Cu₂O Films at Potentials More Positive than the Nernst Potential of Ni²⁺/Ni⁰

Deposition of Nickel on Electrodeposited Cu₂O Films at Potentials More Positive than the Nernst Potential of Ni²⁺/Ni⁰

Fabrication by AC Deposition and Antimicrobial Properties of Pyramidal-Shaped Cu₂O-TiO₂ Heterostructures

Freestanding atomically-thin cuprous oxide sheets for improved visible-light photoelectrochemical water splitting

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Photoelectrochemistry of Porous p-Cu[sub 2]O Films

Cited by 72 publications

References 23 publications

Deposition of Nickel on Electrodeposited Cu2O Films at Potentials More Positive than the Nernst Potential of Ni2+/Ni0

Deposition of Nickel on Electrodeposited Cu2O Films at Potentials More Positive than the Nernst Potential of Ni2+/Ni0

Fabrication by AC Deposition and Antimicrobial Properties of Pyramidal-Shaped Cu2O-TiO2 Heterostructures

Freestanding atomically-thin cuprous oxide sheets for improved visible-light photoelectrochemical water splitting

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Deposition of Nickel on Electrodeposited Cu₂O Films at Potentials More Positive than the Nernst Potential of Ni²⁺/Ni⁰

Deposition of Nickel on Electrodeposited Cu₂O Films at Potentials More Positive than the Nernst Potential of Ni²⁺/Ni⁰

Fabrication by AC Deposition and Antimicrobial Properties of Pyramidal-Shaped Cu₂O-TiO₂ Heterostructures