Beyond the top of the volcano? A unified approach to electrocatalytic oxygen reduction and oxygen evolution

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388955%3A_____%2F16%3A00472523" target="_blank" >RIV/61388955:_____/16:00472523 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1016/j.nanoen.2016.04.011" target="_blank" >http://dx.doi.org/10.1016/j.nanoen.2016.04.011</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.nanoen.2016.04.011" target="_blank" >10.1016/j.nanoen.2016.04.011</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Beyond the top of the volcano? A unified approach to electrocatalytic oxygen reduction and oxygen evolution

Popis výsledku v původním jazyce

We study the oxygen reduction (ORR) and the oxygen evolution reaction (OER) and based on previous obtained mechanistic insight we provide a unified general analysis of the two reactions simultaneously. The analysis shows that control over at least two independent binding energies is required to obtain a reversible perfect catalyst for both ORR and OER. Often only the reactivity of the surface is changed by changing from one material to another and all binding energies scale with the reactivity. We investigate the limitation in efficiency imposed by these linear scaling relations. This analysis gives rise to a double volcano for ORR and OER, with a region in between, forbidden by the scaling relations. The reversible perfect catalyst for both ORR and OER would fall into this "forbidden region". Previously, we have found that hydrogen acceptor functionality on oxide surfaces can improve the catalytic performance for OER beyond the limitations originating from the scaling relations. We use this concept to search for promising combinations of binding sites and hydrogen donor/acceptor sites available in transition metal doped graphene, which can act as a catalyst for ORR and OER. We find that MnN4-site embedded in graphene by itself or combined with a COOH is a promising combination for a great combined ORR/OER catalyst. (C) 2016 Elsevier Ltd. All rights reserved.

Název v anglickém jazyce

Beyond the top of the volcano? A unified approach to electrocatalytic oxygen reduction and oxygen evolution

Popis výsledku anglicky

We study the oxygen reduction (ORR) and the oxygen evolution reaction (OER) and based on previous obtained mechanistic insight we provide a unified general analysis of the two reactions simultaneously. The analysis shows that control over at least two independent binding energies is required to obtain a reversible perfect catalyst for both ORR and OER. Often only the reactivity of the surface is changed by changing from one material to another and all binding energies scale with the reactivity. We investigate the limitation in efficiency imposed by these linear scaling relations. This analysis gives rise to a double volcano for ORR and OER, with a region in between, forbidden by the scaling relations. The reversible perfect catalyst for both ORR and OER would fall into this "forbidden region". Previously, we have found that hydrogen acceptor functionality on oxide surfaces can improve the catalytic performance for OER beyond the limitations originating from the scaling relations. We use this concept to search for promising combinations of binding sites and hydrogen donor/acceptor sites available in transition metal doped graphene, which can act as a catalyst for ORR and OER. We find that MnN4-site embedded in graphene by itself or combined with a COOH is a promising combination for a great combined ORR/OER catalyst. (C) 2016 Elsevier Ltd. All rights reserved.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

CF - Fyzikální chemie a teoretická chemie

OECD FORD obor

—

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2016

Kód důvěrnosti údajů

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

Název periodika

Nano Energy

ISSN

2211-2855

e-ISSN

—

Svazek periodika

29

Číslo periodika v rámci svazku

NOV 2016

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

10

Strana od-do

126-135

Kód UT WoS článku

000389624100010

EID výsledku v databázi Scopus

2-s2.0-84965069069