Improving the HER activity and stability of Pt nanoparticles by titanium oxynitride support

Smiljanić, Milutin (avtor), Panić, Stefan R. (avtor), Bele, Marjan (avtor), Ruiz-Zepeda, Francisco (avtor), Pavko, Luka (avtor), Gašparič, Lea (avtor), Kokalj, Anton (avtor), Gaberšček, Miran (avtor), Hodnik, Nejc (avtor)

Water electrolysis powered by renewables is regarded as the feasible route for the production of hydrogen, obtained at the cathode side through electrochemical hydrogen evolution reaction (HER). Herein, we present a rational strategy to improve the overall HER catalytic performance of Pt, which is known as the best monometallic catalyst for this reaction, by supporting it on a conductive titanium oxynitride (TiON$_x$) dispersed over reduced graphene oxide nanoribbons. Characterization of the Pt/TiON$_x$ composite revealed the presence of small Pt particles with diameters between 2 and 3 nm, which are well dispersed over the TiON$_x$ support. The Pt/TiON$_x$ nanocomposite exhibited improved HER activity and stability with respect to the Pt/C benchmark in an acid electrolyte, which was ascribed to the strong metal−support interaction (SMSI) triggered between the TiON$_x$ support and grafted Pt nanoparticles. SMSI between TiON$_x$ and Pt was evidenced by X-ray photoelectron spectroscopy (XPS) through a shift of the binding energies of the characteristic Pt 4f photoelectron lines with respect to Pt/C. Density functional theory (DFT) calculations confirmed the strong interaction between Pt nanoparticles and the TiON$_x$ support. This strong interaction improves the stability of Pt nanoparticles and weakens the binding of chemisorbed H atoms thereon. Both of these effects may result in enhanced HER activity.

• Jezik: Angleški jezik
• Ključne besede: hydrogen evolution reaction, platinum nanoparticles, titanium oxynitride, strong metal−support interaction, XPS, DFT, catalysts, evolution reactions, metal nanoparticles, nanoparticles, platinum
• Vrsta gradiva: Članek v reviji
• Tipologija: 1.01 - Izvirni znanstveni članek
• Organizacija: FKKT - Fakulteta za kemijo in kemijsko tehnologijo
• Status publikacije: Objavljeno
• Različica publikacije: Objavljena publikacija
• Leto izida: 2022
• Št. strani: Str. 13021–13033
• Številčenje: Vol. 12, iss. 20
• PID: 20.500.12556/RUL-144309
• UDK: 544.5/.6
• ISSN pri članku: 2155-5435
• DOI: 10.1021/acscatal.2c03214
• COBISS.SI-ID: 128119555
• Datum objave v RUL: 14.02.2023

Gradivo je del revije

• Naslov: ACS catalysis
• Skrajšan naslov: ACS catal.
• Založnik: American Chemical Society
• ISSN: 2155-5435
• COBISS.SI-ID: 518529817

Licence

• Licenca: CC BY 4.0, Creative Commons Priznanje avtorstva 4.0 Mednarodna
• Povezava: http://creativecommons.org/licenses/by/4.0/deed.sl
• Opis: To je standardna licenca Creative Commons, ki daje uporabnikom največ možnosti za nadaljnjo uporabo dela, pri čemer morajo navesti avtorja.

Sekundarni jezik

• Jezik: Slovenski jezik
• Ključne besede: elektrokemija, elektroliza, vodik, nanodelci, platina