Role of Nitrogen‐Doped Carbon Nanofibers Inside Polymer Membranes for Enhancing Fuel Cell Performance

Jang, Jeongsoek; Lee, Jin Goo; Hwang, Ho Jung; Kwon, Ohchan; Jeon, Ok Sung; Ji, Yunseong; Shul, Yong Gun

doi:10.1002/ente.201700642

Cited by 3 publications

(2 citation statements)

References 23 publications

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“…The use of classic electrochemical impedance spectroscopy (EIS) allows observations of the influence of specific operating parameters, including the RH of reactant gases, but only under stable conditions [24][25][26][27][28][29]. This method is also ideally suited for the ex situ testing of individual components of the fuel cell [30][31][32][33][34][35]. EIS is also used in other fields for studying stationary systems [36][37][38].…”

Section: Introductionmentioning

confidence: 99%

Optimization of the Relative Humidity of Reactant Gases in Hydrogen Fuel Cells Using Dynamic Impedance Measurements

et al. 2021

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Water management is a key factor affecting the efficiency of proton exchange membrane fuel cells (PEMFCs). The currently used monitoring methods of PEMFCs provide limited information about which processes or components that humidity has a significant impact upon. Herein, we propose the use of a novel approach of impedance measurements using a multi-sinusoidal perturbation signal, which enables impedance measurements under dynamic operating conditions. The manuscript presents the effect of the relative humidity (RH) of the reactants on the instantaneous impedance of the middle cell in the PEMFC stack as a function of the current load. Analysis of changes in the values of equivalent circuit elements was carried out to determine which process determines the stack’s performance depending on the load range of the fuel cell during operation. Comprehensive impedance analysis showed that to ensure optimal cell operation, the humidity of the reactants should be adjusted depending on the load level. The results showed that at low-current loads, the humidity of gases should be at least 50%, while at high-current loads, the cell should operate optimally at a gas humidity of 30% or lower. The presented methodology provides an important tool for optimizing and monitoring the operation of fuel cells.

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Section: Introductionmentioning

confidence: 99%

Optimization of the Relative Humidity of Reactant Gases in Hydrogen Fuel Cells Using Dynamic Impedance Measurements

et al. 2021

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“…Direct methanol fuel cell (DMFC) has attracted extensive attention as automotive and portable power sources because of the easily available fuel, high specific energy and low pollution level. [1][2][3][4][5] As one of the core components in DMFCs, proton exchange membrane (PEM) possesses the functions of inhibiting methanol crossover as well as providing pathways for proton transport from anode to cathode. [6][7][8][9] Nowadays, the standard perfluorosulfonic acid ionomers (such as Nafion) have been largely impeded by the serious methanol-permeability problem for application in DMFCs.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Diamine Cross‐Linker on Semi‐IPNs of BPPO/SPEEK Membranes for Direct Methanol Fuel Cell

et al. 2018

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Low methanol permeability is one of the most critical factors for proton exchange membranes utilized in direct methanol fuel cells (DMFCs). Here, sulfonated poly(ether ether ketone) (SPEEK) polymer chains are interpenetrated into the semi‐interpenetrating polymer networks (semi‐IPNs) constructed by the alkylation reaction between bromobenzyl groups of bromomethylated poly(phenylene oxide) and amine groups of 2,2′‐(ethylenedioxy)bis(ethylamine) cross‐linker. The influences of crosslinking network contents on the key properties of SPEEK membranes are systematically investigated. Dimensional stability and methanol‐permeability resistance are enhanced as the increase of the crosslinking network contents. The relative selectivity is significantly improved due to the largely reduced methanol permeability. The DMFC assembled by the membrane with 20 wt.% crosslinking networks demonstrates four times higher power output than the Nafion 117 DMFC in 5 M methanol solution.

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Implementation of DEIS for reliable fault monitoring and detection in PEMFC single cells and stacks

Darowicki

Janicka

Mielniczek

et al. 2018

Electrochimica Acta

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Role of Nitrogen‐Doped Carbon Nanofibers Inside Polymer Membranes for Enhancing Fuel Cell Performance

Abstract: Role‐playing: The pseudo‐capacitive behavior of a membrane reinforced by nitrogen‐doped carbon nanofibers (N‐CNF) reduces the charge‐transfer resistances in polymer electrolyte membrane fuel cells (PEMFCs), which, in turn, enhances their power density.

Cited by 3 publications

References 23 publications

Optimization of the Relative Humidity of Reactant Gases in Hydrogen Fuel Cells Using Dynamic Impedance Measurements

Optimization of the Relative Humidity of Reactant Gases in Hydrogen Fuel Cells Using Dynamic Impedance Measurements

Investigation of Diamine Cross‐Linker on Semi‐IPNs of BPPO/SPEEK Membranes for Direct Methanol Fuel Cell

Implementation of DEIS for reliable fault monitoring and detection in PEMFC single cells and stacks

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