A parametric study of the solid acid fuel cell cathode

Orozco, Diana Constanza; Dyck, Ondrej; Papandrew, Alexander B.; Zawodzinski, Thomas A.

doi:10.1016/j.jpowsour.2018.03.030

Cited by 4 publications

(3 citation statements)

References 13 publications

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“…The work differs from an analogous study reported by Orozco et al in which material properties were estimated by fitting to experimental polarization curves and, more significantly, in which incorrect boundary conditions were applied. [ 9 ] After demonstrating that the model, with independently determined input parameters, accurately predicts SAFC polarization curves, we explore the implications of changing microstructure and operating parameters on fuel cell power output. While the analysis suggests some opportunity for improved performance SAFCs using the current material set, it indicates that truly meaningful advances will likely necessitate the discovery of alternative ORR catalysts.…”

Section: Introductionmentioning

confidence: 99%

From Fundamental Interfacial Reaction Kinetics to Macroscopic Current–Voltage Characteristics: Case Study of Solid Acid Fuel Cell Limitations and Possibilities

Wang,

Haile

2024

Adv Materials Inter

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The unique properties of solid acid electrolytes, in particular CsH2PO4, are in many ways ideal for fuel cell operation. However, the technology is constrained by high cathode overpotentials. Here a simplified cathode geometry is employed to obtain the fundamental electrochemical parameters (exchange current density and charge transfer coefficient) describing the oxygen reduction reaction (ORR) at the CsH2PO4‐Pt‐gas interface. The parameters are incorporated into a 1D model of the voltage–current characteristics of realistic SAFC cathodes, which reproduced the measured polarization behavior of such cathodes without recourse to fitting adjustable parameters. Following this validation, the model is utilized to evaluate the impact of changes to cathode properties, microstructure, and operating conditions. Of these, the charge transfer coefficient, measured to have a value of ≈0.6 for ORR on Pt in the SAFC cathode environment, is found to have the greatest impact on power output. Nevertheless, even without material modifications, a combination of microstructural and operational modifications are identified with projected performance metrics meeting Department of Energy targets (0.8 V at 300 mA cm−2, and peak power density of 1 W cm−2), albeit at high Pt loadings. However, the analysis indicates that truly meaningful advances will likely necessitate the discovery of alternative ORR catalysts.

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Section: Introductionmentioning

confidence: 99%

From Fundamental Interfacial Reaction Kinetics to Macroscopic Current–Voltage Characteristics: Case Study of Solid Acid Fuel Cell Limitations and Possibilities

Wang,

Haile

2024

Adv Materials Inter

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“…[2][3][4] Since then, the Haile group and others have continued to advance solid acid fuel cell (SAFC) technology. [5][6][7][8][9][10][11][12][13] Of the solid acid electrolytes reported over the past two decades, CsH 2 PO 4 has emerged as the material of choice for highperformance SAFCs. While CsH 2 PO 4 is functional, it possesses characteristics that complicate its use as an electrolyte.…”

Section: Introductionmentioning

confidence: 99%

“…[ 2–4 ] Since then, the Haile group and others have continued to advance solid acid fuel cell (SAFC) technology. [ 5–13 ]…”

Section: Introductionmentioning

confidence: 99%

Comparing Proton Conduction in Potassium and Ammonium Borosulfate—Isostructural Inorganic Polyelectrolytes Exhibiting High Proton Mobility

Chaloux

Ridenour

Johannes

et al. 2022

Adv Energy and Sustain Res

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A scalable new method for the synthesis of borosulfate compounds in sulfuric acid providing control over product crystallite size is reported as an alternative to traditional methods requiring slow growth from oleum. This new synthetic approach is used to prepare three isostructural, 1D borosulfates: one containing only ammonium cations, another containing only potassium cations, and the third sample with a solid solution of 1:1 ammonium–potassium. Proton conduction in polycrystalline pellets of these borosulfate electrolytes is compared by electrochemical impedance spectroscopy (EIS) and ab initio molecular dynamics (AIMD) simulations. For a given cation (e.g., NH4 +), conductivity decreases by three orders of magnitude with decreasing particle size while maintaining constant activation energy, indicating that proton conduction is not primarily a grain‐boundary process. AIMD simulations show that excess proton mobility in K[B(SO4)2] is in line with that of NH4[B(SO4)2], being a backbone (not cation) mediated process. Although K[B(SO4)2] exhibits higher activation energy (60.6 ± 2.0 kJ mol−1) than NH4[B(SO4)2] (33.8 ± 1.0 kJ mol−1), at 200 °C it achieves comparable conductivity to NH4[B(SO4)2] samples, which is attributable to hydrolytic B–O–H defects being the common source of mobile protons in these materials.

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Cyclic utilisation of waste tires as nanostructured anode materials for Li-ion batteries

Hou

Wang³

et al. 2020

Materials Technology

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A parametric study of the solid acid fuel cell cathode

Cited by 4 publications

References 13 publications

From Fundamental Interfacial Reaction Kinetics to Macroscopic Current–Voltage Characteristics: Case Study of Solid Acid Fuel Cell Limitations and Possibilities

From Fundamental Interfacial Reaction Kinetics to Macroscopic Current–Voltage Characteristics: Case Study of Solid Acid Fuel Cell Limitations and Possibilities

Comparing Proton Conduction in Potassium and Ammonium Borosulfate—Isostructural Inorganic Polyelectrolytes Exhibiting High Proton Mobility

Cyclic utilisation of waste tires as nanostructured anode materials for Li-ion batteries

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