Exploring PtAg onto silanized biogenic silica as an electrocatalyst for H2 evolution: A combined experimental and theoretical investigation
Por:
Bogireddy, NKR, El Hachimi, AG, Celaya, CA, Muñiz, J, Thomas, T, Elias, AL, Lei, Y, Terrones, M, Agarwal, V
Publicada:
1 ene 2025
Resumen:
The task of creating a remarkably stable and effective electrochemical catalyst for efficient hydrogen evolution is arduous, primarily due to the multitude of factors that need to be taken into account for the industrial utilization of Pt. In this work, hybrid formation through in- situ reduction of Pt onto biogenic porous silica (Pt-SiO2) 2 ) is tested for its use as an efficient catalyst for hydrogen production. Exceptionally high electrocatalytic activity and excellent reusability of catalysts up to 200 cycles have been demonstrated. Pt-SiO2 2 with low Pt content of 0.48 to 0.82 at% with active catalytic sites exhibit superior catalytic activity with a Tafel slope of 22 mV dec-1 -1 and an overpotential of 28 mV (vs. RHE at 10 mA cm-2) -2 ) as compared to the Pt wire and previously reported bare Pt-SiO2 2 (0.65 at% and 0.48 at% of Pt), and hybrid (Pt/Ag) structures formed onto two different biogenic porous SiO2 2 substrates. The best catalytic performance of the Pt1Ag3 1 Ag 3 cluster, representing a low Pt concentration, has been validated by Density Functional Theory (DFT) calculations. Here, the high production from the Pt1Ag3 1 Ag 3 cluster is assigned to the mutual synergistic effect between Pt/Ag atoms. The Pt atoms transfer the excess charge to the nearest Ag neighbors inside the cluster, facilitating hydrogen diffusion on the activated sites. These important findings authenticate the superior hydrogen production at reduced Pt concentration on amine-functionalized biogenic porous silica.
Filiaciones:
Bogireddy, NKR:
Univ Nacl Autonoma Mexico, Inst Ciencias Fis, Cuernavaca 62209, Morelos, Mexico
El Hachimi, AG:
Inst Invest Quim Univ La Rioja IQUR, Complejo Cientif Tecnol, Logrono 26006, Spain
Celaya, CA:
Univ Nacl Autonoma Mexico, Ctr Nanociencias & Nanotecnol, Km 107 Carretera Tijuana, Ensenada 22800, BC, Mexico
Muñiz, J:
Univ Nacl Autonoma, Inst Energias Renovables, Temixco 62580, Morelos, Mexico
Thomas, T:
Indian Inst Technol, Dept Energy Sci & Engn, Mumbai 400076, India
Elias, AL:
Binghamton Univ, Dept Phys, Binghamton, NY 13902 USA
Lei, Y:
Tsinghua Univ, Tsinghua Shenzhen Int Grad Sch, Shenzhen 518055, Peoples R China
Terrones, M:
Penn State Univ, Ctr Dimens & Layered Mat D, Dept Phys, University Pk, PA 16802 USA
Agarwal, V:
Univ Autonoma Estado Morelos, Ctr Invest Ingn & Ciencias Aplicadas, Cuernavaca 62209, Morelos, Mexico
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