Ruthenium and Platinum-Modified Titanium Dioxide Support for NaBH4 Hydrolysis

Cigdem Tuc Altaf; Valentina G Minkina; Stanislav I Shabunya; Tuluhan O Colak; Nurdan Demirci Sankir; Mehmet Sankir; Vladimir I Kalinin

doi:10.1021/acsomega.3c04269

Ruthenium and Platinum-Modified Titanium Dioxide Support for NaBH₄ Hydrolysis

ACS Omega. 2023 Sep 20;8(39):36100-36108. doi: 10.1021/acsomega.3c04269. eCollection 2023 Oct 3.

Authors

Cigdem Tuc Altaf¹, Valentina G Minkina², Stanislav I Shabunya², Tuluhan O Colak¹, Nurdan Demirci Sankir^{1

3}, Mehmet Sankir^{1

3}, Vladimir I Kalinin²

Affiliations

¹ Micro and Nanotechnology Graduate Program, TOBB University of Economics and Technology, Sogutozu Caddesi no. 43, Sogutozu 06560, Ankara, Turkey.
² A.V. Luikov Heat and Mass Transfer Institute of the National Academy of Sciences of Belarus, P. Brovka, 15. Minsk 220072, Republic of Belarus.
³ Department of Materials Science and Nanotechnology Engineering, TOBB University of Economics and Technology, Sogutozu Caddesi no. 43, Sogutozu 06560, Ankara, Turkey.

Abstract

Highly stable platinum (Pt) and ruthenium (Ru)-based catalysts on titanium oxide (TiO₂) nanoparticle support were prepared. The productivity of hydrogen generation from sodium borohydride (NaBH₄) hydrolysis was observed to be as high as 95%. The activation energies for the hydrolysis reaction in the presence of Ru/TiO₂ in aqueous and alkaline solutions were 62.00 and 64.65 kJ mol^-1, respectively. On the other hand, the activation energy value of the hydrolysis reaction with the Pt/TiO₂ catalyst decreased from 60.5 to 53.2 kJ mol^-1, and the solution was changed from an aqueous to an alkaline medium. The experimental results have indicated that NaOH concentration (ranging from 0.5 to 2 M) affected the hydrogen generation rate (HGR) differently for both metals on the TiO₂ support. Consequently, the HGR of the hydrolysis reaction in the presence of the Ru/TiO₂ catalyst decreased with increasing NaOH concentration, whereas the Pt/TiO₂ catalyst efficiency increased with increasing NaOH concentration.