Electrocatalytic performance of different cobalt molybdate structures for the water oxidation in alkaline media

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dc.creatorMariandry del Valle Rodriguez Rodriguez
dc.creatorTeodorico Castro Ramalho
dc.creatorAnderson Dias
dc.creatorMarcio Cesar Pereira
dc.creatorMatheus Cata Preta Stolzemburg
dc.creatorCarlos Giovani Oliveira Bruziquesi
dc.creatorAdilson Candido da Silva
dc.creatorCíntia Grossi de Abreu
dc.creatorKisla Prislen Félix Siqueira
dc.creatorLuiz Carlos Alves de Oliveira
dc.creatorMaira dos Santos Pires
dc.creatorLívia Clara Tavares Lacerda
dc.date.accessioned2023-08-10T19:43:42Z
dc.date.accessioned2025-09-09T00:30:25Z
dc.date.available2023-08-10T19:43:42Z
dc.date.issued2018
dc.description.sponsorshipCNPq - Conselho Nacional de Desenvolvimento Científico e Tecnológico
dc.description.sponsorshipFAPEMIG - Fundação de Amparo à Pesquisa do Estado de Minas Gerais
dc.description.sponsorshipFINEP - Financiadora de Estudos e Projetos, Financiadora de Estudos e Projetos
dc.description.sponsorshipOutra Agência
dc.identifier.doihttps://doi.org/10.1039/C8CE01073K
dc.identifier.issn1466-8033
dc.identifier.urihttps://hdl.handle.net/1843/57709
dc.languageeng
dc.publisherUniversidade Federal de Minas Gerais
dc.relation.ispartofCrystEngComm
dc.rightsAcesso Restrito
dc.subjectCobalto
dc.subjectEletrocatálise
dc.subjectMetal
dc.subjectAdsorção
dc.subject.otherCobalt molybdates
dc.subject.otherCrystalline structures
dc.subject.otherElectrocatalytic activities
dc.subject.otherElectrocatalytic performance
dc.subject.otherComputational simulations
dc.subject.otherMetal adsorption
dc.titleElectrocatalytic performance of different cobalt molybdate structures for the water oxidation in alkaline media
dc.typeArtigo de periódico
local.citation.epage5601
local.citation.issue37
local.citation.spage5592
local.citation.volume20
local.description.resumoCobalt molybdates with different crystalline structures, i.e., α, β, and hydrated (H)-CoMoO4, were synthesized, and their electrocatalytic activities were thoroughly examined for catalyzing the oxygen evolution reaction (OER) in alkaline media. The material characteristics were associated with the electrocatalytic properties by evaluating the CoMoO4 crystal structures (XRD and Raman), morphologies (TEM), and electrochemical features (electrochemically active surface area, roughness factor, electrochemical impedance, Tafel analysis, and controlled-current electrolysis). These combined findings revealed that the electrocatalytic performance is greatly influenced by the crystalline structures of CoMoO4, following the order α-CoMoO4 > H-CoMoO4 > β-CoMoO4. The H-CoMoO4 catalysts crystallized in the triclinic space group, P[1 with combining macron] (#2), with Z = 4. On the other hand, the α- and β-CoMoO4 catalysts exhibited a monoclinic structure, C2/m (#12), with Z = 8. In the OER experiments, α-CoMoO4 showed an overpotential of 0.43 ± 0.05 V compared to the 0.51 ± 0.05 V and 0.56 ± 0.04 V exhibited by the H-CoMoO4 and β-CoMoO4 catalysts, respectively, to achieve 10 mA cm−2. All CoMoO4 structures displayed stability for at least 6 h at a controlled current density of 10 mA cm−2. Finally, computational simulations indicate that the coexistence of Co and Mo ions in edge-shared octahedral sites of α-CoMoO4 may favor the interaction between the O atom of the water molecule and the metal adsorption sites due to its surface being electronically less dense than β- and H-CoMoO4 surfaces, thus resulting in its higher performance for OER.
local.identifier.orcidhttps://orcid.org/0000-0001-7413-1087
local.identifier.orcidhttps://orcid.org/0000-0003-2911-3730
local.identifier.orcidhttps://orcid.org/0000-0002-7324-1353
local.identifier.orcidhttps://orcid.org/0000-0001-9143-782X
local.identifier.orcidhttps://orcid.org/0000-0002-9831-5726
local.identifier.orcidhttps://orcid.org/0000-0001-9143-782X
local.identifier.orcidhttps://orcid.org/0000-0003-4595-2753
local.publisher.countryBrasil
local.publisher.departmentICX - DEPARTAMENTO DE QUÍMICA
local.publisher.initialsUFMG
local.url.externahttps://pubs.rsc.org/en/content/articlelanding/2018/ce/c8ce01073k#!

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