{"title":"Electroreduction of CO2 to methanol and formate-species on AgxO@SnO2 and AgxO@Bi2O3 electrocatalysts","authors":"Cindy Xanath Tirado López , Elsa Miriam Arce Estrada , Miguel Ángel Soto Mendoza , Arturo Manzo Robledo , Araceli Ezeta Mejía , Ricardo Gerardo Sánchez Alvarado","doi":"10.1016/j.mtsust.2025.101213","DOIUrl":null,"url":null,"abstract":"<div><div>The electrochemical conversion of CO<sub>2</sub> into value-added chemicals is a key strategy for the development of sustainable carbon capture and utilization technologies, as well as for renewable fuel production. In this study, Ag<sub>x</sub>O@SnO<sub>2</sub> and Ag<sub>x</sub>O@Bi<sub>2</sub>O<sub>3</sub> nanoparticles were synthesized via a seed-mediated growth method and evaluated as electrocatalysts for the electrochemical CO<sub>2</sub> reduction reaction (CO<sub>2</sub>RR). Structural and compositional characterizations were carried out using SEM, TEM, EDS, XRD, and XPS techniques. Revealing the oxidized state of the electrocatalysts (Ag<sub>2</sub>O, AgO, SnO<sub>2</sub>, and Bi<sub>2</sub>O<sub>3</sub>). The electrochemical activity and selectivity were assessed in 0.1 M KHCO<sub>3</sub> electrolyte using cyclic voltammetry, Tafel approach, chronoamperometry, and DEMS. Both electrocatalysts exhibited stable activity (−5, and −8 mAcm<sup>−2</sup>) and produced formate-species. However, the electrocatalyst composition had a determinant role in the conversion-selectivity process<strong>,</strong> Ag<sub>x</sub>O@Bi<sub>2</sub>O<sub>3</sub> showed enhanced selectivity toward methanol, while Ag<sub>x</sub>O@SnO<sub>2</sub> boosted the formation of formaldehyde. The consistent detection of formate-species (formic acid, and formaldehyde) by DEMS <em>in situ</em> of both electrocatalyst suggests a common intermediate pathway, although the distinct electronic and surface properties of the electrocatalysts directed the reaction toward different value-added chemicals.</div></div>","PeriodicalId":18322,"journal":{"name":"Materials Today Sustainability","volume":"31 ","pages":"Article 101213"},"PeriodicalIF":7.9000,"publicationDate":"2025-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Materials Today Sustainability","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S2589234725001423","RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"GREEN & SUSTAINABLE SCIENCE & TECHNOLOGY","Score":null,"Total":0}
引用次数: 0
Abstract
The electrochemical conversion of CO2 into value-added chemicals is a key strategy for the development of sustainable carbon capture and utilization technologies, as well as for renewable fuel production. In this study, AgxO@SnO2 and AgxO@Bi2O3 nanoparticles were synthesized via a seed-mediated growth method and evaluated as electrocatalysts for the electrochemical CO2 reduction reaction (CO2RR). Structural and compositional characterizations were carried out using SEM, TEM, EDS, XRD, and XPS techniques. Revealing the oxidized state of the electrocatalysts (Ag2O, AgO, SnO2, and Bi2O3). The electrochemical activity and selectivity were assessed in 0.1 M KHCO3 electrolyte using cyclic voltammetry, Tafel approach, chronoamperometry, and DEMS. Both electrocatalysts exhibited stable activity (−5, and −8 mAcm−2) and produced formate-species. However, the electrocatalyst composition had a determinant role in the conversion-selectivity process, AgxO@Bi2O3 showed enhanced selectivity toward methanol, while AgxO@SnO2 boosted the formation of formaldehyde. The consistent detection of formate-species (formic acid, and formaldehyde) by DEMS in situ of both electrocatalyst suggests a common intermediate pathway, although the distinct electronic and surface properties of the electrocatalysts directed the reaction toward different value-added chemicals.
期刊介绍:
Materials Today Sustainability is a multi-disciplinary journal covering all aspects of sustainability through materials science.
With a rapidly increasing population with growing demands, materials science has emerged as a critical discipline toward protecting of the environment and ensuring the long term survival of future generations.