Untitled

León, Carlos Ponce de; Field, R.W.

doi:10.1023/a:1004015617522

Cited by 15 publications

(5 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The first is the determination of the limiting current density from the plot of electric resistance, R, vs. the reciprocal current, I −1 . This method is widely used for this purpose but some authors consider it to be not sufficiently exact and underestimating the limiting current density values (Ponce-de-León & Field, 2000). For this reason, the second method was used and the limiting current density was also determined from the plot of the derivative dI/dU vs. the electric current, I.…”

Section: Resultsmentioning

confidence: 99%

Determination of limiting current density for different electrodialysis modules

2014

View full text Add to dashboard Cite

Limiting current density of ammonium nitrate solution in laboratory-, pilot-, and industrial-scale electrodialysis modules were determined to provide a method for the prediction of the limiting current density of ammonium nitrate solutions at any conditions. The current-voltage curve was measured in each case and the limiting current density was evaluated using the dependence of the derivative, dI/dU, on the electric current, I. The limiting current was determined as a current at which the derivative dI/dU equals zero. The developed method enables not only the prediction of the limiting current density but the limiting cut and limiting flux can be determined concurrently at any linear flow velocity of the diluate and inlet ammonium nitrate concentration. It could help to prevent working in the overlimiting region and to avoid undesirable decrease of current efficiency and pH changes. The limiting cut is the maximal cut that can be obtained at certain linear flow velocity and module geometry irrespective of the inlet ammonium nitrate concentration and it is very useful information when designing a new electrodialysis unit for specific application.

show abstract

Section: Resultsmentioning

confidence: 99%

Determination of limiting current density for different electrodialysis modules

2014

View full text Add to dashboard Cite

show abstract

“…It is a useful and easily accessible parameter for initial catalyst evaluation. [ 97,98 ] The diffusion component is typically given by the limiting current density at high overpotential, [ 99 ] and by comparing the Koutecky–Levich plot. [ 100,101 ]…”

Section: Catalyst Layer Performance Characterizationmentioning

confidence: 99%

Engineering Catalyst Layers for Next‐Generation Polymer Electrolyte Fuel Cells: A Review of Design, Materials, and Methods

Suter

Smith

Hack

et al. 2021

Advanced Energy Materials

118

115

View full text Add to dashboard Cite

Polymer electrolyte fuel cells (PEFCs) are a promising replacement for the fossil fuel–dependent automotive and energy sectors. They have become increasingly commercialized in the last decade; however, significant limitations on durability and performance limit their commercial uptake. Catalyst layer (CL) design is commonly reported to impact device power density and durability; although, a consensus is rarely reached due to differences in testing conditions, experimental design, and types of data reported. This is further exacerbated by aspects of CL design such as catalyst support, proton conduction, catalyst, fabrication, and morphology, being significantly interdependent; hence, a wider appreciation is required in order to optimize performance, improve durability, and reduce costs. Here, the cutting‐edge research within the field of PEFCs is reviewed, investigating the effect of different manufacturing techniques, electrolyte distribution, support materials, surface chemistries, and total porosity on power density and durability. These are critically appraised from an applied perspective to inform the most relevant and promising pathways to make and test commercially viable cells. This holistic view of the competing aspects of CL design and preparation will facilitate the development of optimized CLs, especially the incorporation of novel catalyst support materials.

show abstract

“…The background scan was obtained at zero flow rate after removal of oxygen by nitrogen sparging. The limiting current data was obtained using the curve fitting method as outlined by Ponce-de-Leon and Field [27] by plotting log (𝐸/𝐼) against reciprocal current log (1/𝐼), see Figure 9.…”

Section: Mass Transfer Of Dissolved Oxygenmentioning

confidence: 99%