Durability of template-free Fe-N-C foams for electrochemical oxygen reduction in alkaline solution

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F18%3A10389379" target="_blank" >RIV/00216208:11320/18:10389379 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1016/j.jpowsour.2017.07.025" target="_blank" >https://doi.org/10.1016/j.jpowsour.2017.07.025</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.jpowsour.2017.07.025" target="_blank" >10.1016/j.jpowsour.2017.07.025</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Durability of template-free Fe-N-C foams for electrochemical oxygen reduction in alkaline solution

Popis výsledku v původním jazyce

Due to the high cost and limited availability of platinum, the development of non-platinum-group metals (non-PGM) catalysts is of paramount importance. A promising alternative to Pt are Fe-N-C-based materials. Here we present the synthesis, characterization and electrochemistry of a template-free nitrogen doped carbon foam, impregnated with iron. This low-cost and gram-scale method results in materials with micron-scale pore size and large surface area (1600 m(2)g(-1)). When applied as an oxygen reduction reaction (ORR) electrocatalyst in alkaline solution, the Fe-N-C foams display extremely high initial activity, slightly out-performing commercially available non-PGM catalysts (NCP-2000, Pajarito Powder). The load-cycle durability in alkaline solution is investigated, and the performance steadily degrades over 60,000 potential cycles, whilst the commercial catalyst is remarkably stable. The post-operation catalyst microstructure is elucidated by transmission electron microscopy (TEM), to provide insight into the degradation processes. The resulting images suggest that potential cycling leads to leaching of atomically dispersed Fe-N-2/4 sites in all the catalysts, whereas encapsulated iron nanoparticles are protected.

Název v anglickém jazyce

Durability of template-free Fe-N-C foams for electrochemical oxygen reduction in alkaline solution

Popis výsledku anglicky

Due to the high cost and limited availability of platinum, the development of non-platinum-group metals (non-PGM) catalysts is of paramount importance. A promising alternative to Pt are Fe-N-C-based materials. Here we present the synthesis, characterization and electrochemistry of a template-free nitrogen doped carbon foam, impregnated with iron. This low-cost and gram-scale method results in materials with micron-scale pore size and large surface area (1600 m(2)g(-1)). When applied as an oxygen reduction reaction (ORR) electrocatalyst in alkaline solution, the Fe-N-C foams display extremely high initial activity, slightly out-performing commercially available non-PGM catalysts (NCP-2000, Pajarito Powder). The load-cycle durability in alkaline solution is investigated, and the performance steadily degrades over 60,000 potential cycles, whilst the commercial catalyst is remarkably stable. The post-operation catalyst microstructure is elucidated by transmission electron microscopy (TEM), to provide insight into the degradation processes. The resulting images suggest that potential cycling leads to leaching of atomically dispersed Fe-N-2/4 sites in all the catalysts, whereas encapsulated iron nanoparticles are protected.

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

<a href="/cs/project/LM2015057" target="_blank" >LM2015057: Laboratoř fyziky povrchů – Optická dráha pro výzkum materiálů</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2018

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

—

Svazek periodika

375

Číslo periodika v rámci svazku

Jan

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

11

Strana od-do

244-254

Kód UT WoS článku

000418463700027

EID výsledku v databázi Scopus

2-s2.0-85021892790