A Model Approach to Uncover the Role of the IrOx Crystallographic Structure and Chemistry on OER Activity and Stability via Annealing a Sacrificial Template

IF 11.3 1区化学 Q1 CHEMISTRY, PHYSICAL

ACS Catalysis Pub Date : 2025-01-29 DOI:10.1021/acscatal.4c06396

Delphine Clauss, Vincent Martin, Jaysen Nelayah, Raphaël Chattot, Pierre Bordet, Jakub Drnec, Marta Mirolo, Laetitia Dubau, Frédéric Maillard

{"title":"A Model Approach to Uncover the Role of the IrOx Crystallographic Structure and Chemistry on OER Activity and Stability via Annealing a Sacrificial Template","authors":"Delphine Clauss, Vincent Martin, Jaysen Nelayah, Raphaël Chattot, Pierre Bordet, Jakub Drnec, Marta Mirolo, Laetitia Dubau, Frédéric Maillard","doi":"10.1021/acscatal.4c06396","DOIUrl":null,"url":null,"abstract":"Iridium oxide nanoparticles (IrOx NPs) hold promise to lower the catalyst cost of proton-exchange membrane water electrolyzers (PEMWE). However, their enhanced oxygen evolution reaction (OER) activity often comes at the expense of stability. Achieving a delicate balance between these two conflicting properties requires a comprehensive understanding of how the structural, morphological, and chemical characteristics of IrOx NPs influence them. To address this challenge, we synthesized IrOx NPs supported on carbon (IrOx/C), and annealed them in air at temperatures ranging from 340 to 870 °C. We obtained a library of materials, ranging from small, amorphous IrOx NPs supported on carbon to larger self-supported crystalline IrO2. Using this library, we evidence the critical role of the IrOx particle size, crystallinity and chemistry on both the OER activity and catalyst stability. We further identify that an annealing temperature of 520 °C provides an optimal balance between OER activity and stability, and we demonstrate size control of unsupported small IrO2 NPs at temperatures above 500 °C, highlighting the significant role of the sacrificial support in shaping nanostructured IrO2 catalysts.","PeriodicalId":9,"journal":{"name":"ACS Catalysis ","volume":"39 1","pages":""},"PeriodicalIF":11.3000,"publicationDate":"2025-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"ACS Catalysis ","FirstCategoryId":"92","ListUrlMain":"https://doi.org/10.1021/acscatal.4c06396","RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}

引用次数: 0

Abstract

Iridium oxide nanoparticles (IrO_x NPs) hold promise to lower the catalyst cost of proton-exchange membrane water electrolyzers (PEMWE). However, their enhanced oxygen evolution reaction (OER) activity often comes at the expense of stability. Achieving a delicate balance between these two conflicting properties requires a comprehensive understanding of how the structural, morphological, and chemical characteristics of IrO_x NPs influence them. To address this challenge, we synthesized IrO_x NPs supported on carbon (IrO_x/C), and annealed them in air at temperatures ranging from 340 to 870 °C. We obtained a library of materials, ranging from small, amorphous IrO_x NPs supported on carbon to larger self-supported crystalline IrO₂. Using this library, we evidence the critical role of the IrO_x particle size, crystallinity and chemistry on both the OER activity and catalyst stability. We further identify that an annealing temperature of 520 °C provides an optimal balance between OER activity and stability, and we demonstrate size control of unsupported small IrO₂ NPs at temperatures above 500 °C, highlighting the significant role of the sacrificial support in shaping nanostructured IrO₂ catalysts.

Abstract Image

查看原文本刊更多论文

求助全文

约1分钟内获得全文求助全文

来源期刊

ACS Catalysis CHEMISTRY, PHYSICAL-

CiteScore

20.80

自引率

6.20%

发文量

1253

审稿时长

1.5 months

期刊介绍： ACS Catalysis is an esteemed journal that publishes original research in the fields of heterogeneous catalysis, molecular catalysis, and biocatalysis. It offers broad coverage across diverse areas such as life sciences, organometallics and synthesis, photochemistry and electrochemistry, drug discovery and synthesis, materials science, environmental protection, polymer discovery and synthesis, and energy and fuels. The scope of the journal is to showcase innovative work in various aspects of catalysis. This includes new reactions and novel synthetic approaches utilizing known catalysts, the discovery or modification of new catalysts, elucidation of catalytic mechanisms through cutting-edge investigations, practical enhancements of existing processes, as well as conceptual advances in the field. Contributions to ACS Catalysis can encompass both experimental and theoretical research focused on catalytic molecules, macromolecules, and materials that exhibit catalytic turnover.