Effects of (NH4)2SO4 and BTA on the nanostructure of copper foam prepared by electrodeposition

Nam, Do-Hwan; Kim, Ryoung-Hee; Han, Dong‐Wook; Kim, JeongHan; Kwon, Hyuk‐Sang

doi:10.1016/j.electacta.2011.08.025

Cited by 91 publications

(63 citation statements)

References 31 publications

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“…6 A convenient alternative procedure is deposition in presence of copious hydrogen evolution: the gas bubbles act as a dynamic, faint template that disappears after switching off the current and allows a single step preparation. The method has been tested for the deposition of several porous metals including Sn, 8 Cu, [8][9][10] Ni, 11,12 Ag and Au 13 and typically results in a bimodal porosity of potential interest in electrocatalysis, as the tiny structures with dimensions down to tens of nanometers provide a large surface area, while macropores tens of microns large may ensure enhanced mass transport. The extension of this approach to deposition of porous alloys of controlled composition is not obvious and only a few cases have been described.…”

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confidence: 99%

“…[1][2][3][4][5][6][7][8][9][10][11][12][13] Among the traditional preparation methods, dealloying is applicable only in a few cases and the final materials contain inclusions of the less noble metal. 1,2 Modern approaches based on electrodeposition within rigid templates 3 -based e.g.…”

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confidence: 99%

“…The method has been tested for the deposition of several porous metals including Sn, 8 Cu, [8][9][10]11,12 Ag and Au…”

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confidence: 99%

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Electrodeposition of Cu-Ni Alloy Electrodes with Bimodal Porosity and Their Use for Nitrate Reduction

Mattarozzi

Cattarin

Comisso

et al. 2013

ECS Electrochemistry Letters

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Cu-Ni alloy layers with a bimodal porosity -a spongy material made of submicron dendrites, featuring macroscopic pores tens of microns large -can be deposited from baths containing the metal ions, sodium citrate and ammonium sulfate, using large current densities (−3 A cm −2 ) producing vigorous hydrogen evolution. Alloys with a broad range of compositions are obtained using baths with different Cu(II)/Ni(II) concentration ratios. Voltammetric experiments of nitrate reduction at compact and porous Cu-Ni RDEs show, in the latter case, lower overvoltage and higher peak currents, resulting from enhanced transport and improved catalytic activity. © 2013 The Electrochemical Society. [DOI: 10.1149/2.004311eel] All rights reserved.Manuscript submitted July 18, 2013; revised manuscript received August 6, 2013. Published August 21, 2013 Porous electrodes are a topic of intense current interest.1-13 Among the traditional preparation methods, dealloying is applicable only in a few cases and the final materials contain inclusions of the less noble metal.1,2 Modern approaches based on electrodeposition within rigid templates 3 -based e.g. on polymers, 4,5 silica spheres, 6 alumina membranes 7 -warrant a good control of shape, size and organization of the inner porosity, but require final removal of the template and usually provide uniform tiny porosity that may not improve electrode performances in diffusion controlled processes. 6A convenient alternative procedure is deposition in presence of copious hydrogen evolution: the gas bubbles act as a dynamic, faint template that disappears after switching off the current and allows a single step preparation. The method has been tested for the deposition of several porous metals including Sn, 8 Cu, [8][9][10]11,12 Ag and Au 13and typically results in a bimodal porosity of potential interest in electrocatalysis, as the tiny structures with dimensions down to tens of nanometers provide a large surface area, while macropores tens of microns large may ensure enhanced mass transport. The extension of this approach to deposition of porous alloys of controlled composition is not obvious and only a few cases have been described. 14,15 We have recently reported on the deposition of compact Cu-Ni alloys with a large range of compositions and on their strong activity in nitrate reduction. 16 We propose in this paper the deposition of porous Cu-Ni electrodes that show improved characteristics in this reaction and that might provide, at low cost, a good electrode material in applications like wastewater treatment and electroanalysis. 17 ExperimentalThe single compartment cell used for deposition was equipped with a Pt wire counter electrode wound as a spiral around the inner wall. RDE electrodes were obtained from Cu rods (Goodfellow, 99.999% purity), or Nb rods (Goodfellow, 99.9%) inserted in a PTFE sheath; their geometric area was 0.317 cm 2 and 0.247 cm 2 , respectively. Nb RDEs were used for EDS analyses, Nb sheets (Goodfellow, 99.5%) for deposition of samples devoted to XRD analyses. All ...

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Electrodeposition of Cu-Ni Alloy Electrodes with Bimodal Porosity and Their Use for Nitrate Reduction

Mattarozzi

Cattarin

Comisso

et al. 2013

ECS Electrochemistry Letters

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“…Two ways have been proposed for the increase in specific surface area and the improvement of micro-and nano-structural characteristics of the open porous structures: a) the addition of additives to the electroplating baths [4,[21][22][23] and b) the application of periodically changing regimes of electrolysis, such as those of pulsating overpotential (PO) [24][25][26][27], pulsating current (PC) [28][29][30] and reversing current (RC) [31].…”

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confidence: 99%

Formation of the honeycomb-like electrodes by the regime of puslating overpotential in the second range

Nikolić¹,

Branković²,

Pavlović³

2012

J. Electrochem. Sci. Eng.

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“…5 More reactive metals and those with higher melting temperatures require special processing, usually through solid-state techniques. 3,[6][7][8][9][10][11] In the solid-state foaming process, 12,13 metal foams are typically produced using a 2-step process: 1)…”

Section: Introductionmentioning

confidence: 99%

Surpassing the Theoretical Limit of Porosity in Conventional Solid-State Foaming: Microstructure Characterization of Length Scales in a Copper Metal Foam

Tschopp¹,

Darling²,

Atwater³

2014

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Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing the burden, to Department of Defense, Washington Headquarters Services, Directorate for Information Operations and Reports (0704-0188), 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302. Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to any penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number. PLEASE DO NOT RETURN YOUR FORM TO THE ABOVE ADDRESS. REPORT DATE (DD-MM-YYYY)2 5f. WORK UNIT NUMBER Solid-state processes for creating metal foams are often complex and/or time consuming, and in methods such as gas entrapment, there are practical limits to the porosity achievable due to pore coalescence and percolation. A simple process has been developed to create copper-based metal foam with porosity greater than 65%. The process is unique as expansion occurs within particles, not between them. The method is applied to create a bulk part. The microstructure length scales of the foamed particles are examined using 1-and 2-point microstructure statistics. PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES) 8. PERFORMING ORGANIZATION REPORT NUMBER SPONSOR/MONITOR'S ACRONYM(S) 9. SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES) SPONSOR/MONITOR'S REPORT NUMBER(S)

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Effects of (NH4)2SO4 and BTA on the nanostructure of copper foam prepared by electrodeposition

Cited by 91 publications

References 31 publications

Electrodeposition of Cu-Ni Alloy Electrodes with Bimodal Porosity and Their Use for Nitrate Reduction

Electrodeposition of Cu-Ni Alloy Electrodes with Bimodal Porosity and Their Use for Nitrate Reduction

Formation of the honeycomb-like electrodes by the regime of puslating overpotential in the second range

Surpassing the Theoretical Limit of Porosity in Conventional Solid-State Foaming: Microstructure Characterization of Length Scales in a Copper Metal Foam

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