Electrochemical deposition of Zn on TiN microelectrode arrays for microanodes

Ferapontova, Elena E.; Terry, Jonathan G.; Walton, A.J.; Mountford, C. P.; Crain, Jason; Buck, Amy; Dickinson, P. H.; Campbell, Colin J.; Beattie, John S.; Ghazal, Peter; Mount, Andrew R.

doi:10.1016/j.elecom.2006.09.005

Cited by 22 publications

(17 citation statements)

References 17 publications

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“…cell construction, a Zn wire was the anode, and either the HRP-or GOx͑POx͒/HRP-graphite electrode was the biocathode. To avoid the reaction of Zn with oxygen, 42,43 Zn wire anode was covered successively with a cationic-exchange Nafion film and then with a layer of ionically conducting Zn phosphate Zn 3 ͑PO 4 ͒ 2 formed during repeated oxidative cycling of the wire in phosphate buffer solution as described elsewhere. 43 Potentiometry ͑galvanostatic and zero-current measurements͒ and chronoamperometry were performed with the Zn/biocathode system until steady-state values of the U cell or current were achieved.…”

Section: Methodsmentioning

confidence: 99%

“…The stability of the cell operation was tested with HRP-and GOx͑POx͒-HRP-modified graphite electrodes of 65ϫ 65 m 2 surface area to lessen the substrate concentration gradient and thus avoid diffusion limitations, which affect operation of a planar macrosize biocathode in quiescent solutions. 12,15,42 For preparation of the microelectrodes, a needle was placed in the center of the graphite disk electrode, and the whole electrode area excluding the area blocked by the needle was painted with nail varnish. The modification of the produced microelectrodes with enzymes was performed as described above.…”

Section: Methodsmentioning

confidence: 99%

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Peroxidase biocathodes for a biofuel cell development

Gomez

Shipovskov

Ferapontova

2010

Journal of Renewable and Sustainable Energy

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In terms of sustainable energy production, enzymatic biofuel cells are attractive for a number of special applications, such as disposable implantable power suppliers for medical sensor-transmitters and drug delivery/activator systems and selfpowered enzyme-based biosensors; they offer practical advantages of using abundant organic raw materials as biofuels for clean and sustainable energy production. In this paper we discuss what power densities can be expected from enzymatic biofuel cells and what are the possibilities and limits for their optimization. As example, in this work, the designed hybrid biofuel cell formed by the battery type Zn anode and the biocathode, comprising horseradish peroxidase ͑HRP͒ immobilized on graphite and utilizing H 2 O 2 as an oxidizer, is considered. The cell yields the open circuit voltage V oc of 1.68 and 1.57 V and the short-circuit current density i sc of 800 A cm −2 at pH 6 and 580 A cm −2 at pH 7.45 in quiescent solutions. The biofuel cell operated at 1.5 V for 6 days; the maximum power density of the cell was 98 W cm −2 at 0.6 V and pH 6. When coupled to the H 2 O 2 -producing glucose oxidizing enzymes ͑glucose oxidase or pyranose oxidase͒, the HRP biocathode was functional in the presence of glucose with no essential loss in I-V characteristics. The biocathode performance and possibilities for its optimization were studied and compared with the hitherto existing biocathodes and biofuel cell designs.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Peroxidase biocathodes for a biofuel cell development

Gomez

Shipovskov

Ferapontova

2010

Journal of Renewable and Sustainable Energy

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“…The Zn anode was prepared according to Ref. [34], to avoid its inactivation in the reaction with oxygen during discharge [35,36]. Briefly, the Zn wire anode was covered successively with a cationic-exchange Nafion film and then with a layer of ionically conducting Zn phosphate Zn 3 (PO 4 ) 2 Â 4H 2 O formed during repeated oxidative cycling of the wire in a phosphate buffer solution as described elsewhere [34].…”

Section: Electrode Preparationmentioning

confidence: 99%

Activation of laccase bioelectrocatalysis of O2 reduction to H2O by carbon nanoparticles

Jensen

Vagin

Королева

et al. 2012

Journal of Electroanalytical Chemistry

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“…6a that i m increases but t m decreases as the polarized potential becomes more negative. This phenomenon can be ascribed to the increase in formation and growth rate of zinc nuclei due to larger polarized potential [10,25].…”

Section: Voltammetric Behavior Of Zinc In the Solutionsmentioning

confidence: 95%

“…There are two models for the crystal nucleation and growth during metal electrodeposition: instantaneous and progressive [10,25,27,28]. In the instantaneous nucleation process, the number of nuclei is large and all the active sites of electrode are covered instantaneously by nuclei, the relation of current (i) with time (t) follows:…”

Section: Chronoamerometric Responsementioning

confidence: 99%

Effect of sodium benzoate on zinc electrodeposition in chloride solution

Huang

et al. 2011

J Appl Electrochem

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The effect of sodium benzoate on the electrodeposition of zinc on carbon steel electrode from acidic chloride solution was studied by cyclic voltammetry (CV), differential capacitance (DC), chronoamperometry (CA), scanning electron microscopy (SEM), and X-ray diffraction (XRD). A dimensionless graph model was used to analyze the nucleation process of zinc. It is found that the sodium benzoate has a blocking effect on the zinc electrodeposition when its concentration is higher than 0.03 M but will accelerate the formation rate of zinc nuclei when its concentration is lower than 0.03 M. Benzoate can be adsorbed on the surface of the electrode, which reduces the interface tension of electrode/solution and favors the formation and growth of zinc nuclei when its concentration is lower than 0.03 M, but forms a separated layer and retards the formation and growth of zinc nuclei when its concentration is higher than 0.03 M.

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Electrochemical deposition of Zn on TiN microelectrode arrays for microanodes

Cited by 22 publications

References 17 publications

Peroxidase biocathodes for a biofuel cell development

Peroxidase biocathodes for a biofuel cell development

Activation of laccase bioelectrocatalysis of O2 reduction to H2O by carbon nanoparticles

Effect of sodium benzoate on zinc electrodeposition in chloride solution

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