The hydrogen evolution reaction (HER) is the process where protons from the electrolyte combine with the electrons from the metal electrode catalyst to produce atomic hydrogen adsorbed on the metal surface. The reaction ends when these hydrogen atoms then form molecular hydrogen and thereby desorbs from the surface of the catalyst. The bonding between the catalyst and the proton should be optimal such as to favour the formation of adsorbed H atom and at the same time not so strong as to hinder the H2 molecular desorption to occur. The main applications of HER are in the cathodic half cells of water splitting and fuel cells. The efficiency of such a cathodic material depends on how strongly or weakly the H atoms are adsorbed on the metal catalyst. We present an experimental and theoretical study of the state of the art HER metallic electrocatalyst platinum (Pt) by tuning its reactivity with graphene (Gr) and iron (Fe). Using density functional theory (DFT) the reactivity of hydrogen (H) in the two systems namely Gr/Pt(111) and Gr/Fe/Pt(111) is investigated. The presence of Gr is observed to increase the selectivity/permeability to protons [1] and at the same time weaken the H adsorption compared to bare Pt [2]. This should favour H diffusion at the interface and hence H2 molecular desorption. The H adsorption weakens further in the presence of Fe and even more with Gr and Fe. In addition to platinum the performance of gold (Au) in the presence of Fe and Gr has also been studied and compared in this work.

Baby, A., Perilli, D., Liu, H., Kosmala, T., Lamana, L., Granozzi, G., et al. (2019). Tuning the hydrogen evolution reaction at the Pt(111) surface with 2D material and non-precious metal. Intervento presentato a: Materials for Today's Energy Challenges, Padova, Italia.

Tuning the hydrogen evolution reaction at the Pt(111) surface with 2D material and non-precious metal

Baby, A
Primo
;
Perilli, D
Secondo
;
Liu, H;Di Valentin, C.
Ultimo
2019

Abstract

The hydrogen evolution reaction (HER) is the process where protons from the electrolyte combine with the electrons from the metal electrode catalyst to produce atomic hydrogen adsorbed on the metal surface. The reaction ends when these hydrogen atoms then form molecular hydrogen and thereby desorbs from the surface of the catalyst. The bonding between the catalyst and the proton should be optimal such as to favour the formation of adsorbed H atom and at the same time not so strong as to hinder the H2 molecular desorption to occur. The main applications of HER are in the cathodic half cells of water splitting and fuel cells. The efficiency of such a cathodic material depends on how strongly or weakly the H atoms are adsorbed on the metal catalyst. We present an experimental and theoretical study of the state of the art HER metallic electrocatalyst platinum (Pt) by tuning its reactivity with graphene (Gr) and iron (Fe). Using density functional theory (DFT) the reactivity of hydrogen (H) in the two systems namely Gr/Pt(111) and Gr/Fe/Pt(111) is investigated. The presence of Gr is observed to increase the selectivity/permeability to protons [1] and at the same time weaken the H adsorption compared to bare Pt [2]. This should favour H diffusion at the interface and hence H2 molecular desorption. The H adsorption weakens further in the presence of Fe and even more with Gr and Fe. In addition to platinum the performance of gold (Au) in the presence of Fe and Gr has also been studied and compared in this work.
Si
abstract + slide
Scientifica
Hydrogen Evolution Reaction, HER, Platinum, Graphene, Iron
English
Materials for Today's Energy Challenges
Baby, A., Perilli, D., Liu, H., Kosmala, T., Lamana, L., Granozzi, G., et al. (2019). Tuning the hydrogen evolution reaction at the Pt(111) surface with 2D material and non-precious metal. Intervento presentato a: Materials for Today's Energy Challenges, Padova, Italia.
Baby, A; Perilli, D; Liu, H; Kosmala, T; Lamana, L; Granozzi, G; Agnoli, S; Di Valentin, C
File in questo prodotto:
File Dimensione Formato  
Book of Abstracts.pdf

accesso aperto

Descrizione: Book of Abstracts
Tipologia di allegato: Other attachments
Dimensione 9.16 MB
Formato Adobe PDF
9.16 MB Adobe PDF Visualizza/Apri

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: http://hdl.handle.net/10281/232844
Citazioni
  • Scopus ND
  • ???jsp.display-item.citation.isi??? ND
Social impact