Performance enhancement of a direct borohydride fuel cell in practical running conditions

Kim, Cheolhwan; Kim, Kyu-Jung; Ha, Man Yeong

doi:10.1016/j.jpowsour.2008.01.042

Cited by 34 publications

(8 citation statements)

References 18 publications

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“…Fluorinated Zr-based AB 2 -type H 2 storage alloy catalyst on a nickel micro-fibre felt substrate of 100 cm 2 corrugated anode, Nafion 115 membrane, Cathode: Pt 5% on a carbon cloth substrate. After (16).…”

Section: Introductionmentioning

confidence: 99%

Recent Developments in Borohydride Fuel Cells

et al. 2008

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Developments in direct borohydride fuel cells (DBFC) are considered together with electrolyte stability and the choice of membrane and electrode materials. The cyclic voltammetry of borohydride oxidation was studied at three electrodes: a) gold on carbon, Au/C, b) gold on titanate nanotubes, Au/TiN and (c) gold foil. Similar currents were observed from the three electrodes. A DBFC in a single, 2-and 4-bipolar cell configuration with Au/C anode and Pt/C cathode produced 2.2, 3.2 and 9.6 W showed cell voltages of 1.06, 0.81 and 3 V, respectively. In another single cell, the reduction of peroxide on a Pd/Ir coated microfibrous carbon cathode was catalytically more active than a platinised-carbon one. The maximum power density achieved was 78 mW cm -2 at a cell voltage of 1.09 V. The need for further research is highlighted, particularly into new electrocatalyst materials.

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Section: Introductionmentioning

confidence: 99%

Recent Developments in Borohydride Fuel Cells

et al. 2008

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“…H 2 evolution caused by partial electrooxidation and hydrolysis of BH 4 − is one of the most critical problems in the development of DBFC technology because partial electrooxidation and hydrolysis of BH 4 − decrease the coulombic efficiency of BH 4 − , cell performance, and cell life 7–10. The nature of the applied anode catalyst and the concentrations of BH 4 − and OH − in the anolyte significantly affect the H 2 evolution rate 11–18.…”

Section: Introductionmentioning

confidence: 99%

Porous Carbon as Anode Catalyst Support to Improve Borohydride Utilization in a Direct Borohydride Fuel Cell

Wang

Liu

et al. 2015

Fuel Cells

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Our study explores the use of porous carbon as anode catalyst support to improve borohydride utilization in a direct borohydride fuel cell. Pt catalysts supported by carbon aerogel (CA) and macroporous carbon (MPC) are synthesized by template method. The pores in porous carbon materials catch hydrogen bubbles to regulate the contact of anolyte with catalytic sites, and this leads to the depression of hydrogen evolution during BH 4 -electrooxidation. However, the hydrogen bubbles in the pores simultaneously deteriorate charge carrier transport and thus increase anode polarization. The CA-supported Pt catalyst improves the coulombic efficiency of BH 4 -electrooxidation. However, the MPC-supported Pt catalyst performed better than the CA-supported Pt catalyst. MPC also has a good pore distribution, which improves the coulombic efficiency of BH 4 -electrooxidation without decreasing anode performance.

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“…4) creates a countercurrent two-phase (liquid-gas) flow situation in the porous catalyst and diffusion layers as well as in the flow channels. This flow behavior leads to complications in mass transfer for typical gas-diffusion anode structures and fuel distribution methods, and it is further aggravated for larger stacks [18,19]. In a study on the effect of hydrogen evolution on the cell and stack performances of a DBFC, Liu et al showed that the hydrogen evolved during fuel cell operation blocks the channels in the flowfield and may also impede ion conductance at the interface between the catalyst layer and the membrane [18].…”

Section: Introductionmentioning

confidence: 99%

The effect of catalyst support on the performance of PtRu in direct borohydride fuel cell anodes

2009

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A comparative investigation of direct borohydride fuel cell polarization behavior (DBFC) was carried out with respect to the effect of unsupported and supported PtRu anode catalysts using as supports both Vulcan XC-72R and graphite felt (GF). The Vulcan XC-72R-supported catalyst alleviated mass-transfer-related problems associated with hydrogen generation from borohydride hydrolysis taking place mainly on the Ru sites. However, the most significant improvement was obtained by using the three-dimensional GF support. Typically 1.0 mg cm -2 PtRu was galvanostatically electrodeposited by a surfactant templated method on compressed graphite felt of 350 lm thickness. The PtRu/GF anode (Pt:Ru atomic ratio of 1.4:1) generated a DBFC peak power density of 130 mW cm -2 at 333 K. The separator in the DBFC was a Nafion Ò 117 membrane. The peak power density of the PtRu/GF was 270% and 60% higher compared with the catalyst-coated membrane configuration with unsupported PtRu and PtRu/Vulcan XC-72R, respectively.

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Performance enhancement of a direct borohydride fuel cell in practical running conditions

Cited by 34 publications

References 18 publications

Recent Developments in Borohydride Fuel Cells

Recent Developments in Borohydride Fuel Cells

Porous Carbon as Anode Catalyst Support to Improve Borohydride Utilization in a Direct Borohydride Fuel Cell

The effect of catalyst support on the performance of PtRu in direct borohydride fuel cell anodes

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