The development of cheap and efficient catalysts for the oxygen evolution reaction (OER) plays a critical role for sustainable energy conversion and storage. Herein, we report on Mn2O3-based systems supported on nickel foams and functionalized with first-row transition-metal (Fe, Co, Ni) oxide nanoparticles (NPs) as OER electrocatalysts in alkaline media, fabricated by a plasma-assisted process. The remarkable substrate porosity and high Mn2O3 active area, due to the quasi-onedimensional nano-organization, enabled an efficient ultradispersion of Fe2O3, Co3O4, and NiO NPs into Mn2O3 and an intimate oxide-oxide interfacial contact, enhancing thus charge carrier transport and facilitating reactants and products diffusion. Among the developed systems, Fe2O3-Mn2O3 yielded the highest electrocatalytic activity, corresponding to a low overpotential of similar to 350 mV at 10 mA x cm(-2) and a Tafel slope of 70 mV x dec(-1), allowing high current density values. The obtained performances, discussed in relation to the material properties, are superior to almost all the state-of-the-art manganese oxide catalysts and compare favorably with various noble-metal-based systems, paving the way to additional activity improvements via compositional and interfacial engineering.

Quasi-1D Mn2O3 nanostructures functionalized with first-row transition metal oxides as oxygen evolution catalysts

Lorenzo Bigiani;Chiara Maccato
;
Alberto Gasparotto;Cinzia Sada;Davide Barreca
2020

Abstract

The development of cheap and efficient catalysts for the oxygen evolution reaction (OER) plays a critical role for sustainable energy conversion and storage. Herein, we report on Mn2O3-based systems supported on nickel foams and functionalized with first-row transition-metal (Fe, Co, Ni) oxide nanoparticles (NPs) as OER electrocatalysts in alkaline media, fabricated by a plasma-assisted process. The remarkable substrate porosity and high Mn2O3 active area, due to the quasi-onedimensional nano-organization, enabled an efficient ultradispersion of Fe2O3, Co3O4, and NiO NPs into Mn2O3 and an intimate oxide-oxide interfacial contact, enhancing thus charge carrier transport and facilitating reactants and products diffusion. Among the developed systems, Fe2O3-Mn2O3 yielded the highest electrocatalytic activity, corresponding to a low overpotential of similar to 350 mV at 10 mA x cm(-2) and a Tafel slope of 70 mV x dec(-1), allowing high current density values. The obtained performances, discussed in relation to the material properties, are superior to almost all the state-of-the-art manganese oxide catalysts and compare favorably with various noble-metal-based systems, paving the way to additional activity improvements via compositional and interfacial engineering.
File in questo prodotto:
File Dimensione Formato  
reprint_ACS_Nanomat_Mn2O3.pdf

non disponibili

Descrizione: reprint - versione editore
Tipologia: Published (publisher's version)
Licenza: Accesso privato - non pubblico
Dimensione 9.77 MB
Formato Adobe PDF
9.77 MB Adobe PDF Visualizza/Apri   Richiedi una copia
reprint_ACS_Nanomat_Mn2O3_ESI.pdf

accesso aperto

Descrizione: Supporting Information - versione editore
Tipologia: Altro materiale allegato
Licenza: Accesso gratuito
Dimensione 555.65 kB
Formato Adobe PDF
555.65 kB Adobe PDF Visualizza/Apri
Pubblicazioni consigliate

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11577/3358970
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 17
  • ???jsp.display-item.citation.isi??? 17
  • OpenAlex ND
social impact