Interplay of Different Reaction Pathways in the Pulsed Galvanostatic Deposition of Zinc Oxide

Stumpp, Martina; Nguyen, Thi Hai Quyen; Lupó, Christian; Schlettwein, Derck

doi:10.1016/j.electacta.2015.04.038

Cited by 9 publications

(18 citation statements)

References 42 publications

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“…Related literature refers that as long as the resting step duration t off remains approximately equal or higher than t on (50% duty cycle or lower) a complete renewal of the diffusion layer is attained so that the initial surface concentrations of Zn 2+ and NO 3− are completely regenerated 40 . According to this, profile D does not guarantee a proper renewal, and deposition should begin resembling more that of a continuous process in terms of ZnO morphology.…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Electrochemical and photoluminescence response of laser-induced graphene/electrodeposited ZnO composites

Santos

Rodrigues

Pereira

et al. 2021

Sci Rep

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The inherent scalability, low production cost and mechanical flexibility of laser-induced graphene (LIG) combined with its high electrical conductivity, hierarchical porosity and large surface area are appealing characteristics for many applications. Still, other materials can be combined with LIG to provide added functionalities and enhanced performance. This work exploits the most adequate electrodeposition parameters to produce LIG/ZnO nanocomposites. Low-temperature pulsed electrodeposition allowed the conformal and controlled deposition of ZnO rods deep inside the LIG pores whilst maintaining its inherent porosity, which constitute fundamental advances regarding other methods for LIG/ZnO composite production. Compared to bare LIG, the composites more than doubled electrode capacitance up to 1.41 mF cm−2 in 1 M KCl, while maintaining long-term cycle stability, low ohmic losses and swift electron transfer. The composites also display a luminescence band peaked at the orange/red spectral region, with the main excitation maxima at ~ 3.33 eV matching the expected for the ZnO bandgap at room temperature. A pronounced sub-bandgap tail of states with an onset absorption near 3.07 eV indicates a high amount of defect states, namely surface-related defects. This work shows that these environmentally sustainable multifunctional nanocomposites are valid alternatives for supercapacitors, electrochemical/optical biosensors and photocatalytic/photoelectrochemical devices.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Electrochemical and photoluminescence response of laser-induced graphene/electrodeposited ZnO composites

Santos

Rodrigues

Pereira

et al. 2021

Sci Rep

View full text Add to dashboard Cite

show abstract

“…Related literature refers that as long as toff remains approximately equal or higher than ton (50 % duty cycle or lower) a complete renewal of the diffusion layer is attained so that the initial surface concentrations of Zn 2+ and NO 3-are completely regenerated 39 .…”

Section: Synthesis Morphology and Structurementioning

confidence: 99%

“…The ZnO electrodeposition is based on the reduction of oxygen-containing precursors in the presence of ionic Zn at the working electrode of an electrochemical cell, via the application of a suitable electric potential. Pulsed electrodeposition, where the potential or current is alternated between deposition/resting status, provides several advantages compared to the static potential (continuous) process, such as renewal of diffusing layer, promotion of ZnO nucleation and the possibility to control the growth via the employed duty cycle and pulse duration or frequency 22,29,39 . This work explores a wide range of parameters envisaging uniform, conformal and well-intercalated electrodeposition of ZnO rods onto LIG, and describes the morphological, structural, electrochemical and luminescent properties of these novel, environmentally sustainable composites.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical and Photoluminescence Response of Laser-induced Graphene/Electrodeposited ZnO Composites

Santos

Rodrigues

Pereira

et al. 2021

Preprint

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The inherent scalability, low production cost and mechanical flexibility of laser-induced graphene (LIG) combined with its high electrical conductivity, hierarchichal porosity and large surface area are appealing characteristics for many applications. Still, other materials can be combined with LIG to provide added functionalities and enhanced performance. This work exploits the most adequate electrodeposition parameters to produce LIG/ZnO nanocomposites. Low-temperature pulsed electrodeposition allowed the conformal and controlled deposition of ZnO rods deep inside the LIG pores whilst maintaining its inherent porosity, which constitute fundamental advances regarding other methods for LIG/ZnO composite production. Compared to bare LIG, the composites more than doubled electrode capacitance up to 1.41 mF.cm-2 in 1 M KCl, whilst maintaining long-term cycle stability, low ohmic losses and swift electron transfer. The composites also display a luminescence band peaked at the orange/red spectral region, with main excitation maxima at ~3.33 eV matching the expected for the ZnO bandgap. A pronounced sub-bandgap tail of states with an onset absorption near 3.07 eV indicates a high amount of surface states. This work shows that these environmentally sustainable multifunctional nanocomposites are valid alternatives for supercapacitors, electrochemical/optical biosensors and photocatalytic/photoelectrochemical devices.

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“…Assuming that the homogeneous acid–base and Zn‐complexing reactions in the electrolyte occur instantly, the quasi‐particle continuum model supports the efficient calculation of the dynamic concentration profiles in the electrolyte and gives insight into the pH stability in the cell during operation. All models with their requisite parameters are described in the Supporting Information …”

Section: Experimental and Computational Sectionmentioning

confidence: 99%

Designing Aqueous Organic Electrolytes for Zinc–Air Batteries: Method, Simulation, and Validation

Clark

Mainar

Iruin

et al. 2020

Advanced Energy Materials

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Aqueous zinc–air batteries (ZABs) are a low‐cost, safe, and sustainable technology for stationary energy storage. ZABs with pH‐buffered near‐neutral electrolytes have the potential for longer lifetime compared to traditional alkaline ZABs due to the slower absorption of carbonates at nonalkaline pH values. However, existing near‐neutral electrolytes often contain halide salts, which are corrosive and threaten the precipitation of ZnO as the dominant discharge product. This paper presents a method for designing halide‐free aqueous ZAB electrolytes using thermodynamic descriptors to computationally screen components. The dynamic performance of a ZAB with one possible halide‐free aqueous electrolyte based on organic salts is simulated using an advanced method of continuum modeling, and the results are validated by experiments. X‐ray diffraction, scanning electron microscopy, and energy dispersive X‐ray spectroscopy measurements of Zn electrodes show that ZnO is the dominant discharge product, and operando pH measurements confirm the stability of the electrolyte pH during cell cycling. Long‐term full cell cycling tests are performed, and rotating ring disk electrode measurements elucidate the mechanism of oxygen reduction reaction and oxygen evolution reaction. The analysis shows that aqueous electrolytes containing organic salts could be a promising field of research for zinc‐based batteries, due to their Zn2+ chelating and pH buffering properties. The remaining challenges including the electrochemical stability of the electrolyte components are discussed.

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Interplay of Different Reaction Pathways in the Pulsed Galvanostatic Deposition of Zinc Oxide

Cited by 9 publications

References 42 publications

Electrochemical and photoluminescence response of laser-induced graphene/electrodeposited ZnO composites

Electrochemical and photoluminescence response of laser-induced graphene/electrodeposited ZnO composites

Electrochemical and Photoluminescence Response of Laser-induced Graphene/Electrodeposited ZnO Composites

Designing Aqueous Organic Electrolytes for Zinc–Air Batteries: Method, Simulation, and Validation

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