Durable ultra-low-platinum ionomer-free anode catalyst for hydrogen proton exchange membrane fuel cell

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F20%3A10422931" target="_blank" >RIV/00216208:11320/20:10422931 - isvavai.cz</a>

Výsledek na webu

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=vn_Vs~UppR" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=vn_Vs~UppR</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1002/er.5245" target="_blank" >10.1002/er.5245</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Durable ultra-low-platinum ionomer-free anode catalyst for hydrogen proton exchange membrane fuel cell

Popis výsledku v původním jazyce

An ultra-low-platinum catalyst based on finely dispersed platinum (Pt) deposited on a highly porous complex microporous layer was investigated as a candidate of durable anode catalyst for hydrogen oxidation reaction (HOR) in proton exchange membrane fuel cells. Etching of teflonated and nitridized base carbon substrate in oxygen plasma and simultaneous deposition of cerium oxide were applied to increase active surface area and electrochemical activity of the platinum nanocatalyst. Ultra-low loadings of Pt (between 0.85 and 8.5 mu g cm(-2)) deposited by magnetron sputtering on this substrate were assembled with Nafion 212 membrane and commercially available Pt/C cathodes (300-400 mu g cm(-2) Pt). Such membrane electrode assembly (MEA) with extremely low Pt content at anode can deliver high output power densities, reaching 0.95 W cm(-2) or 0.65 W cm(-2) with only 1.7 mu g cm(-2) of Pt, using H-2 as fuel and pure O-2 or air as an oxidant, respectively. Although electrocatalysts with highly dispersed active metals are known to often suffer from irreversible degradation, the above MEAs proved to be very stable when the cell was subjected to a durability test under heavy duty conditions of on/off cycling. The system with lower Pt content is more prone to water flooding which can, however, be eliminated by maintaining better control over the fuel humidity. Average decay of the cell voltage less than 50 mu V h(-1) was obtained in the cycling regime, while excellent stability &lt;10 mu V h(-1) is achievable under the static load of 0.4 A cm(-2).

Název v anglickém jazyce

Durable ultra-low-platinum ionomer-free anode catalyst for hydrogen proton exchange membrane fuel cell

Popis výsledku anglicky

An ultra-low-platinum catalyst based on finely dispersed platinum (Pt) deposited on a highly porous complex microporous layer was investigated as a candidate of durable anode catalyst for hydrogen oxidation reaction (HOR) in proton exchange membrane fuel cells. Etching of teflonated and nitridized base carbon substrate in oxygen plasma and simultaneous deposition of cerium oxide were applied to increase active surface area and electrochemical activity of the platinum nanocatalyst. Ultra-low loadings of Pt (between 0.85 and 8.5 mu g cm(-2)) deposited by magnetron sputtering on this substrate were assembled with Nafion 212 membrane and commercially available Pt/C cathodes (300-400 mu g cm(-2) Pt). Such membrane electrode assembly (MEA) with extremely low Pt content at anode can deliver high output power densities, reaching 0.95 W cm(-2) or 0.65 W cm(-2) with only 1.7 mu g cm(-2) of Pt, using H-2 as fuel and pure O-2 or air as an oxidant, respectively. Although electrocatalysts with highly dispersed active metals are known to often suffer from irreversible degradation, the above MEAs proved to be very stable when the cell was subjected to a durability test under heavy duty conditions of on/off cycling. The system with lower Pt content is more prone to water flooding which can, however, be eliminated by maintaining better control over the fuel humidity. Average decay of the cell voltage less than 50 mu V h(-1) was obtained in the cycling regime, while excellent stability &lt;10 mu V h(-1) is achievable under the static load of 0.4 A cm(-2).

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10305 - Fluids and plasma physics (including surface physics)

Projekt

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

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>S - Specificky vyzkum na vysokych skolach<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2020

Kód důvěrnosti údajů

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

Název periodika

International Journal of Energy Research

ISSN

0363-907X

e-ISSN

—

Svazek periodika

44

Číslo periodika v rámci svazku

6

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

11

Strana od-do

4641-4651

Kód UT WoS článku

000523954300039

EID výsledku v databázi Scopus

2-s2.0-85083037746