Origin of the Low Overpotential for Isopropanol Oxidation on Pt-Ru Electrocatalysts

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F24%3A10492166" target="_blank" >RIV/00216208:11320/24:10492166 - isvavai.cz</a>

Výsledek na webu

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=yZPZo.cy06" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=yZPZo.cy06</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1021/acsenergylett.4c01987" target="_blank" >10.1021/acsenergylett.4c01987</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Origin of the Low Overpotential for Isopropanol Oxidation on Pt-Ru Electrocatalysts

Popis výsledku v původním jazyce

Electrochemically active liquid organic hydrogen carrier (EC-LOHC) technology is an emerging solution for safe and environmentally friendly hydrogen storage and energy conversion based on the use of organic redox-active compounds, such as the isopropanol/acetone couple. In this work, we identify the nature of the active state of the Pt-Ru electrocatalyst that provides the lowest overpotential and, thus, the highest catalytic activity. Toward this aim we employed ex situ electrochemical synchrotron radiation photoelectron spectroscopy (SRPES) and scanning tunneling microscopy (STM) in combination with in situ electrochemical infrared reflection absorption spectroscopy (EC-IRRAS). We show that the lowest overpotentials are not observed for Pt-Ru surface alloys but only in the presence of ultrasmall metallic Pt aggregates formed by dealloying of Pt-Ru catalysts upon oxidation and reduction cycles between 0.0 and 1.5 V-RHE. By tuning the initial composition of the Pt-Ru surface alloy, we maximize the density of active Pt aggregates.

Název v anglickém jazyce

Origin of the Low Overpotential for Isopropanol Oxidation on Pt-Ru Electrocatalysts

Popis výsledku anglicky

Electrochemically active liquid organic hydrogen carrier (EC-LOHC) technology is an emerging solution for safe and environmentally friendly hydrogen storage and energy conversion based on the use of organic redox-active compounds, such as the isopropanol/acetone couple. In this work, we identify the nature of the active state of the Pt-Ru electrocatalyst that provides the lowest overpotential and, thus, the highest catalytic activity. Toward this aim we employed ex situ electrochemical synchrotron radiation photoelectron spectroscopy (SRPES) and scanning tunneling microscopy (STM) in combination with in situ electrochemical infrared reflection absorption spectroscopy (EC-IRRAS). We show that the lowest overpotentials are not observed for Pt-Ru surface alloys but only in the presence of ultrasmall metallic Pt aggregates formed by dealloying of Pt-Ru catalysts upon oxidation and reduction cycles between 0.0 and 1.5 V-RHE. By tuning the initial composition of the Pt-Ru surface alloy, we maximize the density of active Pt aggregates.

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)

Rok uplatnění

2024

Kód důvěrnosti údajů

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

Název periodika

ACS Energy Letters

ISSN

2380-8195

e-ISSN

—

Svazek periodika

9

Číslo periodika v rámci svazku

10

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

8

Strana od-do

4875-4882

Kód UT WoS článku

001315699000001

EID výsledku v databázi Scopus

2-s2.0-85205677642