Electrochimica Acta

Journal: Electrochimica Acta

Abbreviation

Electrochim. Acta

Publisher

Elsevier

ISSN

0013-4686
1873-3859

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Publications 1 - 10 of 80

Template-assisted electrosynthesis of thick stoichiometric thermoelectric Bi2Se3 micropillars
Klösel, Katrina; Pané, Salvador; Mihailovic, Ian A.; et al. (2022)
Electrochimica Acta
A method is presented that enables the template assisted electrochemical deposition of tens of micrometer thick, compact and stoichiometric Bi2Se3 micropillars. This is achieved by modifying the acidic electrolyte that contains 1 M HNO3 with potassium chloride salt and introducing resting pulses during the plating process. We demonstrate the successful deposition into photoresist templates with mold diameters down to 30 µm and thicknesses up to 45 µm. Cross-sectional EDX line measurements confirm an optimal stoichiometry of Bi:Se 40:60 along the growth direction, independent of the micropillar diameter. XRD and Raman measurements after electrochemical deposition point to a primarily orthorhombic structure. To illustrate the potential of this electrochemical method for thermoelectric applications, Seebeck coefficient and electrical conductivity of 45 µm thick orthorhombic Bi2Se3 pillars with 30 and 50 µm diameter are measured for five different electrodeposition runs. An average electrical conductivity of 8.6 S/m (SD = 4.5 S/m) and a high average negative Seebeck coefficient of -162 µV/K (SD = 32 µV/K) was determined. The process presented here is highly promising for the reliable synthesis of Bi2Se3 micropillars, which can be integrated in thermoelectric micro generators or sensors.
Tailoring the physical properties of electrodeposited CoNiReP alloys with large Re content by direct, pulse, and reverse pulse current techniques
Pané, Salvador; Özkale, Berna; Sivaraman, Kartik M.; et al. (2013)
Electrochimica Acta
The composition, surface morphology and structure of CoNiReP alloy films with large Re content (up to 27 at%), obtained in a citrate-glycine based electrolyte have been studied as a function of the electrodeposition technique. Direct current (DC), pulse plating (PP) and reverse pulse plating (RPP) were considered with cathodic current densities from −50 mA cm−2 to −250 mA cm−2. The mechanical and magnetic properties have been analyzed and the data obtained has been correlated with composition and crystallographic structure. For values of j (DC), jon (PP) and jc (RPP) below −100 mA cm−2, Co-rich, P-containing deposits are obtained. Beyond these current densities, both the quantities of Ni and Re increase simultaneously at the expense of Co and P, the latter virtually falling to zero. The highest Re percentage (25–27 at%) was achieved in both PP and RPP conditions at a cathodic pulse of −250 mA cm−2. All the films were either entirely nanocrystalline in nature or partially amorphous. Hardness values as high as 9.2 GPa have been found in PP plated Co64Ni18Re18 deposits. Besides the large hardness, the incorporation of Re in the films leads to high elastic recovery values. The magnetic character of the deposits ranges from soft to semi-hard ferromagnetic.
Functional macroporous iron-phosphorous films by electrodeposition on colloidal crystal templates
Golvano-Escobal, Irati; de Paz-Castany, Roger; Alcântara, Carlos C.J.; et al. (2019)
Electrochimica Acta
Photoanodic oxidation of small organic molecules at nanostructured TiO2 anatase and rutile film electrodes
Bilecka, Idalia; Barczuk, Piotr Juliusz; Augustynski, Jan (2010)
Electrochimica Acta
In-situ XRD and dilatometry investigation of the formation of pillared graphene via electrochemical activation of partially reduced graphite oxide
Hantel, Moritz M.; Nesper, Reinhard; Wokaun, Alexander; et al. (2014)
Electrochimica Acta
Structurally disordered Ta2O5 aerogel for high-rate and highly stable Li-ion and Na-ion storage through surface redox pseudocapacitance
Pan, Long; Huang, Haijian; Liu, Tian; et al. (2019)
Electrochimica Acta
Effect of Acid Washing on the Oxygen Reduction Reaction Activity of Pt-Cu Aerogel Catalysts
Henning, Sebastian; Kühn, Laura; Herranz, Juan; et al. (2017)
Electrochimica Acta
Behaviour of highly crystalline graphitic materials in lithium-ion cells with propylene carbonate containing electrolytes
Hardwick, Laurence J.; Buqa, Hilmi; Holzapfel, Michael; et al. (2007)
Electrochimica Acta
Electrochemical surface reshaping of polycrystalline platinum: Morphology and crystallography
Wei, X.; Reiner, A.; Müller, E.; et al. (2008)
Electrochimica Acta
High-performance electrodeposited Co-rich CoNiReP permanent magnets
Pané, Salvador; Pellicer, E.; Sivaraman, Kartik M.; et al. (2011)
Electrochimica Acta

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Journal: Electrochimica Acta

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