Orientation and Grain Shape control of Cu2O Film and the Related Properties

Wu, Weibing; Feng, Kai; Shan, Beibei; Zhang, Nannan

doi:10.1016/j.electacta.2015.06.010

Cited by 19 publications

(7 citation statements)

References 36 publications

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“…The deposition was performed at a fixed current density of 0.8 mA cm −2 at pH 12 and a controlled temperature of 60 °C. X‐ray diffraction (XRD) confirmed the deposition of a Cu 2 O layer with a selective (111) orientation, consistent with previous electrodeposition studies performed at pH 12 (Figure S3, a) . Electrodes with four different loadings were prepared by varying the deposition time until a total charge of 0.5 C cm −2 , 1 C cm −2 , 3 C cm −2 , or 5 C cm −2 was applied, corresponding to a theoretical catalyst loading ranging from 0.37 to 3.7 mg cm −2 (Table ).…”

Section: Resultssupporting

confidence: 82%

Electrodeposited Cu₂O Films on Gas Diffusion Layers for Selective CO₂ Electroreduction to Ethylene in an Alkaline Flow Electrolyzer

et al. 2019

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Novel electrodes for the electroreduction of CO2 were prepared by the electrodeposition of copper (I) oxide (Cu2O) catalytic films on a gas diffusion layer. Different electrodes were prepared by varying the deposition time, corresponding to catalyst loadings of 0.37, 0.74, 2.22, 3.70 mg cm−2 and a total charge density of 0.5, 1, 3, and 5 C cm−2, respectively. The electrodes were characterized with SEM, XRD, and UPD. The effect of catalyst loading on the selectivity towards ethylene was investigated in an alkaline flow electrolyzer under ambient conditions. The electrodes were found to be highly selective (>60 %) towards ethylene. The 1 C cm−2 electrode reached Faradaic efficiency values as high as 67 % at industrially relevant current densities of 183 mA cm−2, −0.8 V cathode overpotential and 36 % cell energy efficiency. This performance was attributed to the interplaying role of applied potential, local pH, availability of active sites, and reduced CO2 mass transport limitations.

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Section: Resultssupporting

confidence: 82%

Electrodeposited Cu₂O Films on Gas Diffusion Layers for Selective CO₂ Electroreduction to Ethylene in an Alkaline Flow Electrolyzer

et al. 2019

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“…Due to its electronic structure, the bonding, surface energy, and chemical reactivity of Cu 2 O have a direct relationship with its surface morphology and grain sizes. 19,20 Controlling the Cu 2 O surface morphology and particle sizes allows one to decrease the Cu 2 O photoproduction electron-hole recombination rate and thus improve its photoelectric properties. In the electrochemical deposition process, the deposition potential, 21 solution composition, 22,23 and pH 24 influence the surface morphology and particle sizes of Cu 2 O.…”

mentioning

confidence: 99%

Nucleation Mechanism and Optoelectronic Properties of Cu₂O onto ITO Electrode in the Electrochemical Deposition Process

Tang

et al. 2017

J. Electrochem. Soc.

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Cyclic voltammetry and chronoamperometry were used to study the deposition process at the initial stage of Cu 2 O electrodeposition on indium tin oxide-coated glass. The current transient data and predicted values were analyzed by the instantaneous and progressive nucleation models under different electrolyte concentrations. The effects of the Cu 2 O nucleation mechanism on microstructure and photoelectric properties of Cu 2 O were investigated by X-ray photoelectron spectroscopy, X-ray diffractometry, scanning electron microscopy, ultraviolet visible spectrophotometry and fluorescence spectrophotometry. The results show that the electrochemical deposition process of Cu 2 O is irreversible and controlled by diffusion, and the diffusion coefficient was calculated to be 2.2 × 10 −6 cm 2 · s −1 . The nucleation mechanism of Cu 2 O is related to the electrolyte concentration. When the concentrations of Cu(AC) 2 were 5 mM and 15 mM, the nucleation processes of Cu 2 O were consistent with the progressive nucleation and instantaneous nucleation models, respectively. Under the instantaneous nucleation mechanism, the prepared Cu 2 O displayed a uniform structure, composed of sword-shaped dendritic crystal. Compared to the progressive nucleation, the purity of the Cu 2 O was higher, the bandgap narrower (2.006 eV), and the photoluminescence intensity higher. The Cu 2 O had a high carrier density (4.9 × 10 22 cm −3 ) and a low charge transfer resistance (127.27 K · cm 2 ). It exhibits superior photoelectric performance. The forbidden bandgap of cuprous oxide (Cu 2 O) is 1.9-2.5 eV. Due to its advantages in abundance, low cost, and nontoxicity, it satisfies the necessary economy and environmental requirements to be a viable material for solar energy conversion. In addition, the position of the conduction band (more negative than −0.7 V vs RHE) provides a large driving force for proton reduction in photoelectric cells. 16 Among these techniques, electrodeposition has the attractive features of low processing temperature and low instrumentation cost, making it the most common method for the fabrication of Cu 2 O thin films.Since the photoelectric conversion efficiency of Cu 2 O can reach 20% in theory, many scholars have explored the possibility of its application in photovoltaic conversion. However, the current highest photoelectric conversion efficiency is only 5.38%, 17,18 due to the high recombination rate of photoproduction electron holes. Due to its electronic structure, the bonding, surface energy, and chemical reactivity of Cu 2 O have a direct relationship with its surface morphology and grain sizes. 19,20 Controlling the Cu 2 O surface morphology and particle sizes allows one to decrease the Cu 2 O photoproduction electron-hole recombination rate and thus improve its photoelectric properties. In the electrochemical deposition process, the deposition potential, 21 solution composition, 22,23 and pH 24 influence the surface morphology and particle sizes of Cu 2 O. Many researchers have focused on varying the electroch...

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“…72 The {110} direction alternates between layers of copper cations and copper-oxygen mixed layers ( Figure 1.6b). 74 This facet has ~1.5× more copper cations per unit area than the {111} facet. 35 Since the synthesis is usually carried out in aqueous medium, oxygen termination (or copper-oxygen termination for {110}) is expected, as copper termination would be unstable due to the reaction with the OH in water.…”

Section: -Copper Oxidementioning

confidence: 99%

“…Control can be accomplished with the use of compounds which preferentially adsorb to a specific facet, 70 and by adjusting the ratios 76 and the order of addition 68 82 . In addition, many compounds have been used as capping or structural guiding agents, including EDTA, 83 I -, 84 Cl -, 79 PVP, 85 citrate 73 , SDS 86 , CTAB 80 , PEG 87 , NH 3 76 and lactate 74 . The sizes produced can be adjusted by increasing the ratio of OH -:Cu 2+ , with increased OHresulting in larger sizes.…”

Section: -Copper Oxide Growthmentioning

confidence: 99%

“…In addition, each of these sets (additions of copper nitrate or additions of hydrazine) were also tried in the presence and absence of lactic acid. Lactic acid has been used to direct the production of different facets, 74 and so it is expected that the produced structures will be different in its presence. Lastly, each of these were also tried for samples that were half-way embedded into polystyrene thin films and those that were supported on the polystyrene thin films, in order to produce core-shell morphologies that had a 'half-shell' or one bare face, respectively, and investigate their properties.…”

Section: Experimental Considerationsmentioning

confidence: 99%

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Anisotropic Nanomaterials: Silver-Copper Oxide Core-Partial Shell Nanoparticles

Jorgenson¹

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I 1 AbstractAnisotropic materials have a variety of unique properties and potential applications, including catalysis and directed assembly. As such, production of anisotropic nanoparticles is of interest. In this work, the production of core-partial shell silver nanocube-copper oxide nanoparticles, is the goal. To produce these particles, the silver nanocubes are deposited onto polystyrene thin films, and are embedded into the polymer to a controlled depth. This allows for control over the exposed surface, which is the surface available for coating with copper oxide. These nanoparticles can be removed from the surface by dissolving the polystyrene, allowing their in-solution properties to be probed.In order to produce these structures, several set-ups were tried, leading to the development of a promising final set-up. Each of the set-ups had different stirring rates, stability of the attached slide and production of bubbles, which can interfere with the production of copper oxide shells.With the initial set-ups, the order and rate of addition of the reducing agent, hydrazine, or the copper precursor, copper nitrate, were varied, with and without lactic acid and for both supported and embedded nanocubes. The produced morphologies varied for different order and rate of addition of precursors, therefore, allowing for control over the produced morphology by changing these parameters.With the final set-up, an investigation on the amount of copper precursor, sodium hydroxide, and lactic acid for a constant amount of reducing agent was investigated. It was observed that without lactic acid, the produced shells did not increase in coverage II with increased concentrations. However, with lactic acid, the produced structures increase in thickness from low to intermediate concentrations, but at the highest concentration, very little copper oxide was deposited on the cubes' surfaces, as growth had occurred in solution.With this type of method, core-partial shell particles can be successfully produced. Future work should involve further effort for the optimization of the order of addition, and concentrations of precursors, for fine control over the produced structures. III Acknowledgments

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Orientation and Grain Shape control of Cu2O Film and the Related Properties

Cited by 19 publications

References 36 publications

Electrodeposited Cu₂O Films on Gas Diffusion Layers for Selective CO₂ Electroreduction to Ethylene in an Alkaline Flow Electrolyzer

Electrodeposited Cu₂O Films on Gas Diffusion Layers for Selective CO₂ Electroreduction to Ethylene in an Alkaline Flow Electrolyzer

Nucleation Mechanism and Optoelectronic Properties of Cu₂O onto ITO Electrode in the Electrochemical Deposition Process

Anisotropic Nanomaterials: Silver-Copper Oxide Core-Partial Shell Nanoparticles

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Orientation and Grain Shape control of Cu2O Film and the Related Properties

Cited by 19 publications

References 36 publications

Electrodeposited Cu2O Films on Gas Diffusion Layers for Selective CO2 Electroreduction to Ethylene in an Alkaline Flow Electrolyzer

Electrodeposited Cu2O Films on Gas Diffusion Layers for Selective CO2 Electroreduction to Ethylene in an Alkaline Flow Electrolyzer

Nucleation Mechanism and Optoelectronic Properties of Cu2O onto ITO Electrode in the Electrochemical Deposition Process

Anisotropic Nanomaterials: Silver-Copper Oxide Core-Partial Shell Nanoparticles

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Electrodeposited Cu₂O Films on Gas Diffusion Layers for Selective CO₂ Electroreduction to Ethylene in an Alkaline Flow Electrolyzer

Electrodeposited Cu₂O Films on Gas Diffusion Layers for Selective CO₂ Electroreduction to Ethylene in an Alkaline Flow Electrolyzer

Nucleation Mechanism and Optoelectronic Properties of Cu₂O onto ITO Electrode in the Electrochemical Deposition Process