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Mass-transfer measurements at porous 3D Pt-Ir/Ti electrodes in a direct borohydride fuel cell

Mass-transfer measurements at porous 3D Pt-Ir/Ti electrodes in a direct borohydride fuel cell
Mass-transfer measurements at porous 3D Pt-Ir/Ti electrodes in a direct borohydride fuel cell
The volumetric mass-transport coefficients (kmAe) for borohydride ion oxidation at various titanium 3D electrode structures in a rectangular flow channel were calculated by chronoamperometry in a three-electrode electrochemical flow cell. The 3D electrodes used for the oxidation of borohydride in alkaline media included flat, mesh, micromesh, fine mesh and felt coated with a Pt-Ir alloy catalysts. Felt, fine mesh and micromesh electrodes showed high electrochemical activity with current enhancement factors () of 100, 64, 22, respectively at a mean linear flow velocity of 6 cm s-1 through the electrodes. In the presence of a turbulence promoter (TP), the currents from the flat and mesh electrodes improved twice compared with no TP. The 3D electrodes were tested in a complete cell with an anolyte consisting of 2.5 mol dm-3 NaBH4 in 2 mol dm-3 and a catholyte of 0.75 mol dm-3 H2O2 in 2 mol dm-3 NaOH. The power density increased in the following order: plate < micromesh < mesh < felt < mesh + 1 TP < fine mesh. The maximum power density at the fine mesh was 44.5 mW cm-2 at a cell potential of 0.44 V and a current density of 100 mA cm-2 at 296 K.
0013-4651
F198-F206
Abahussain, Abdulaziz, Abdulkarim
99f1aa90-8d2d-46d6-8979-b2606a618e26
Ponce De Leon Albarran, Carlos
508a312e-75ff-4bcb-9151-dacc424d755c
Walsh, Frank
309528e7-062e-439b-af40-9309bc91efb2
Abahussain, Abdulaziz, Abdulkarim
99f1aa90-8d2d-46d6-8979-b2606a618e26
Ponce De Leon Albarran, Carlos
508a312e-75ff-4bcb-9151-dacc424d755c
Walsh, Frank
309528e7-062e-439b-af40-9309bc91efb2

Abahussain, Abdulaziz, Abdulkarim, Ponce De Leon Albarran, Carlos and Walsh, Frank (2018) Mass-transfer measurements at porous 3D Pt-Ir/Ti electrodes in a direct borohydride fuel cell. Journal of the Electrochemical Society, 165 (3), F198-F206. (doi:10.1149/2.0751803jes).

Record type: Article

Abstract

The volumetric mass-transport coefficients (kmAe) for borohydride ion oxidation at various titanium 3D electrode structures in a rectangular flow channel were calculated by chronoamperometry in a three-electrode electrochemical flow cell. The 3D electrodes used for the oxidation of borohydride in alkaline media included flat, mesh, micromesh, fine mesh and felt coated with a Pt-Ir alloy catalysts. Felt, fine mesh and micromesh electrodes showed high electrochemical activity with current enhancement factors () of 100, 64, 22, respectively at a mean linear flow velocity of 6 cm s-1 through the electrodes. In the presence of a turbulence promoter (TP), the currents from the flat and mesh electrodes improved twice compared with no TP. The 3D electrodes were tested in a complete cell with an anolyte consisting of 2.5 mol dm-3 NaBH4 in 2 mol dm-3 and a catholyte of 0.75 mol dm-3 H2O2 in 2 mol dm-3 NaOH. The power density increased in the following order: plate < micromesh < mesh < felt < mesh + 1 TP < fine mesh. The maximum power density at the fine mesh was 44.5 mW cm-2 at a cell potential of 0.44 V and a current density of 100 mA cm-2 at 296 K.

Text Mass-transfer measurements at porous 3D Pt-Ir-Ti electrodes in a DBFC ACCEPTED VERSION - Accepted Manuscript
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Accepted/In Press date: 19 February 2018
e-pub ahead of print date: 6 March 2018

Identifiers

Local EPrints ID: 418348
URI: https://eprints.soton.ac.uk/id/eprint/418348
ISSN: 0013-4651
PURE UUID: a2c992f5-15e6-4934-8c95-ee2a73a14dbf
ORCID for Carlos Ponce De Leon Albarran: ORCID iD orcid.org/0000-0002-1907-5913

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Date deposited: 01 Mar 2018 17:31
Last modified: 06 Jun 2018 12:42

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