Improving the HER Activity and Stability of Pt Nanoparticles by Titanium Oxynitride Support

• DOI: 10.1021/acscatal.2c03214
• Publication Date: 2022-10-12T14:50:23Z
• Authors: Milutin Smiljanić; Stefan Panić; Marjan Bele; Francisco Ruiz-Ze...; Luka Pavko; Lea Gašparič; Anton Kokalj; Miran Gaberšček; Nejc Hodnik
• Keywords: strong metal−support interaction; platina; nanodelci; vodik; info:eu-repo/classification/udc/544.5/.6; evolution reactions; 02 engineering and technology; elektrokemija; elektroliza; titanium oxynitride; DFT; 01 natural sciences; 7. Clean energy; catalysts; hydrogen evolution reaction; 0104 chemical sciences; strong metal-support interaction; XPS; nanoparticles; platinum; metal nanoparticles; elektrokemija, elektroliza, vodik, nanodelci, platina; 0210 nano-technology; platinum nanoparticles

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