Direct determination of diffusion coefficient for borohydride anions in alkaline solutions using chronoamperometry with spherical Au electrodes

Wang, Kangli; Lu, Juntao; Zhuang, Lin

doi:10.1016/j.jelechem.2005.08.009

Cited by 81 publications

(47 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This conclusion is reached primarily through the determination of n, the number of electrons measured during oxidation. In these studies, n was found to be near eight for BH 4 -oxidation on gold [29,30,31,32]. The other metals -Cu, Ag, and Hg -are much less studied for -45 -NaBH 4 oxidation or hydrolysis.…”

Section: Experimental Workmentioning

confidence: 98%

Electrochemical hydrogen Storage Systems

Macdonald¹

2010

View full text Add to dashboard Cite

As the global need for energy increases, scientists and engineers have found a possible solution by using hydrogen to power our world. Although hydrogen can be combusted as a fuel, it is considered an energy carrier for use in fuel cells wherein it is consumed (oxidized) without the production of greenhouse gases and produces electrical energy with high efficiency.Chemical storage of hydrogen involves release of hydrogen in a controlled manner from materials in which the hydrogen is covalently bound. Sodium borohydride and aminoborane are two materials given consideration as chemical hydrogen storage materials by the US Department of Energy. A very significant barrier to adoption of these materials as hydrogen carriers is their regeneration from "spent fuel," i.e., the material remaining after discharge of hydrogen.The U.S. Department of Energy (DOE) formed a Center of Excellence for Chemical Hydrogen Storage, and this work stems from that project. The DOE has identified boron hydrides as being the main compounds of interest as hydrogen storage materials. The various boron hydrides are then oxidized to release their hydrogen, thereby forming a "spent fuel" in the form of a lower boron hydride or even a boron oxide. The ultimate goal of this project is to take the oxidized boron hydrides as the spent fuel and hydrogenate them back to their original form so they can be used again as a fuel. Thus this research is essentially a boron hydride recycling project.In this report, research directed at regeneration of sodium borohydride and aminoborane is described. For sodium borohydride, electrochemical reduction of boric acid and sodium metaborate (representing spent fuel) in alkaline, aqueous solution has been investigated. Similarly to literature reports (primarily patents), a variety of cathode materials were tried in these experiments. Additionally, approaches directed at overcoming electrostatic repulsion of borate anion from the cathode, not described in the previous literature for electrochemical reduction of spent fuels, have been attempted. A quantitative analytical method for measuring the concentration of sodium borohydride in alkaline aqueous solution has been developed as part of this work and is described herein. Finally, findings from stability tests for sodium borohydride in aqueous solutions of several different compositions are reported.For aminoborane, other research institutes have developed regeneration schemes involving tributyltin hydride. In this report, electrochemical reduction experiments attempting to regenerate tributyltin hydride from tributyltin chloride (a representative by-product of the regeneration scheme) are described. These experiments were performed in the non-aqueous solvents acetonitrile and 1,2-dimethoxyethane.A non-aqueous reference electrode for electrolysis experiments in acetonitrile was developed and is described.iii One class of boron hydrides, called polyhedral boranes, became of interest to the DOE due to their ability to contain a sufficient amount of hydrogen t...

show abstract

Section: Experimental Workmentioning

confidence: 98%

Electrochemical hydrogen Storage Systems

Macdonald¹

2010

View full text Add to dashboard Cite

show abstract

“…A c c e p t e d M a n u s c r i p t 9 where I p is the anodic peak current (A), A is the electroactive area (cm 2 ), D is the diffusion coefficient of [Fe(CN) 6 ] 4-in solution, 6.1×10 −6 cm 2 s −1 calculated according to [25], n is the number of electrons transferred in the redox reaction, vis the potential scan rate (V s -1 ), and C is the [Fe(CN) 6 ] 4-concentration in bulk solution (mol cm -3 ). The results are given in Table 1.…”

Section: Potential Windows and Electroactive Areas Of G And Ng And Dementioning

confidence: 99%

Chemically modified graphene and nitrogen-doped graphene: Electrochemical characterisation and sensing applications

Prathish

Bârsan

Geng

et al. 2013

Electrochimica Acta

View full text Add to dashboard Cite

show abstract

“…The slope of dQ/dt 1/2 for the isopropanol oxidation is 2.318 10 3 C m -2 s -1/2 . The relation of Q versus t 1/2 follows following relationship [13,22]. The diffusion coefficient of isopropanol is obtained as 1.06 10 -6 cm 2 s -1 .…”

Section: Determination Of Diffusion Coefficient Of Isopropanol In Alkmentioning

confidence: 99%

“…Here, we studied the elecctrooxidation of isopropanol on the Pd electrode and reported the determination of the diffusion coefficient of isopropanol using the LSV and chronoamperometry methods. The investigation of diffusion coefficient using electrochemical method has been reported [13][14][15]. Here, we firstly used the LSV method with different sweep rate and chronoamperometry method to invest the diffusion coefficient of isopropanol in 1.0 M KOH solution containing 1.0 M isopropanol.…”

Section: Introductionmentioning

confidence: 99%

Determination of Diffusion Coefficient of Isopropanol in Alkaline Medium using Electrochemical Methods on Pd Electrode~!2009-12-09~!2010-02-20~!2010-06-09~!

Wang¹,

Chen²,

Liu³

et al. 2010

TOELECJ

View full text Add to dashboard Cite

Abstract:The diffusion coefficient of isopropanol in alkaline medium using electrochemical methods on Pd electrode has been studied by linear sweep voltammetry (LSV) with different sweep rate and chronoamperometry in 1.0 M KOH solution containing 1.0 M isopropanol. Isopropanol oxidation on the Pd electrode is an irreversible charge-transport process and controlled by a diffusion process. The diffusion coefficient of isopropanol on the Pd electrode is obtained as 1.01 10 -6 cm 2 s -1 using the LSV method and 1.06 10 -6 cm 2 s -1 using the chronoamperometry method. The average diffusion coefficient of isopropanol is 1.04 10 -6 cm 2 s -1 .

show abstract

Direct determination of diffusion coefficient for borohydride anions in alkaline solutions using chronoamperometry with spherical Au electrodes

Cited by 81 publications

References 15 publications

Electrochemical hydrogen Storage Systems

Electrochemical hydrogen Storage Systems

Chemically modified graphene and nitrogen-doped graphene: Electrochemical characterisation and sensing applications

Determination of Diffusion Coefficient of Isopropanol in Alkaline Medium using Electrochemical Methods on Pd Electrode~!2009-12-09~!2010-02-20~!2010-06-09~!

Contact Info

Product

Resources

About