Ionomer content effect on charge and gas transport in the cathode catalyst layer of proton-exchange membrane fuel cells

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985891%3A_____%2F21%3A00542168" target="_blank" >RIV/67985891:_____/21:00542168 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00216208:11320/21:10438537 RIV/00216208:11310/21:10438537

Výsledek na webu

<a href="https://www-sciencedirect-com.ezproxy.lib.cas.cz/science/article/pii/S0378775321000793?via%3Dihub" target="_blank" >https://www-sciencedirect-com.ezproxy.lib.cas.cz/science/article/pii/S0378775321000793?via%3Dihub</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.jpowsour.2021.229531" target="_blank" >10.1016/j.jpowsour.2021.229531</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Ionomer content effect on charge and gas transport in the cathode catalyst layer of proton-exchange membrane fuel cells

Popis výsledku v původním jazyce

Proton-exchange membrane fuel cell (PEMFC) performance is strongly related to the complex transport of gas and charge carriers in the cathode catalyst layer. Thus, we investigated the transport properties of catalyst layers at different ionomer/carbon ratios, ranging from 0.1 to 1, focusing on oxygen, proton and electron transport. Oxygen transport was studied using the limiting current technique, separately analyzing the contributions of molecular, Knudsen, and ionomer transport resistances by changing the temperature and gas pressure. The proton and electron resistance of the catalyst layers were determined by impedance spectroscopy and current voltage measurements, respectively. The results showed that the performance of fuel cells can be enhanced by selecting a suitable ionomer/carbon ratio and that increasing the ionomer content decreases the proton resistance and increases the electron resistance of catalyst layers. Accordingly, low oxygen transport and proton resistance at an ionomer/carbon ratio of 0.6 (26.5%wt.) led to the highest fuel cell power density (595 mW cm(-2)). These results fully support well-established in numerous works optimal ionomer content, revealing the underlying mechanisms of high fuel cell performance. Furthermore, the porosimetry results and electron microscopy measurements confirmed that transport properties strongly affect fuel cell performance.

Název v anglickém jazyce

Ionomer content effect on charge and gas transport in the cathode catalyst layer of proton-exchange membrane fuel cells

Popis výsledku anglicky

Proton-exchange membrane fuel cell (PEMFC) performance is strongly related to the complex transport of gas and charge carriers in the cathode catalyst layer. Thus, we investigated the transport properties of catalyst layers at different ionomer/carbon ratios, ranging from 0.1 to 1, focusing on oxygen, proton and electron transport. Oxygen transport was studied using the limiting current technique, separately analyzing the contributions of molecular, Knudsen, and ionomer transport resistances by changing the temperature and gas pressure. The proton and electron resistance of the catalyst layers were determined by impedance spectroscopy and current voltage measurements, respectively. The results showed that the performance of fuel cells can be enhanced by selecting a suitable ionomer/carbon ratio and that increasing the ionomer content decreases the proton resistance and increases the electron resistance of catalyst layers. Accordingly, low oxygen transport and proton resistance at an ionomer/carbon ratio of 0.6 (26.5%wt.) led to the highest fuel cell power density (595 mW cm(-2)). These results fully support well-established in numerous works optimal ionomer content, revealing the underlying mechanisms of high fuel cell performance. Furthermore, the porosimetry results and electron microscopy measurements confirmed that transport properties strongly affect fuel cell performance.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10405 - Electrochemistry (dry cells, batteries, fuel cells, corrosion metals, electrolysis)

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2021

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Journal of Power Sources

ISSN

0378-7753

e-ISSN

1873-2755

Svazek periodika

490

Číslo periodika v rámci svazku

APR 1

Stát vydavatele periodika

CH - Švýcarská konfederace

Počet stran výsledku

9

Strana od-do

229531

Kód UT WoS článku

000621173500003

EID výsledku v databázi Scopus

2-s2.0-85100386437