Jump to main content
Jump to site search
Access to RSC content Close the message box

Continue to access RSC content when you are not at your institution. Follow our step-by-step guide.



TiO2-mediated visible-light-driven hydrogen evolution by ligand-capped Ru nanoparticles

Author affiliations

Abstract

Ru nanomaterials have recently emerged as potential substitutes for classical Pt-based cathodes for the hydrogen evolution reaction (HER). In this regard, nanoparticle surface-functionalization through the so-called organometallic approach is a promising strategy towards synthesizing tailored highly active and durable HER (photo)electrocatalysts with limitless tunability. Herein, efficient (turnover numbers over 480 molH2 molRu−1 and a turnover frequency of 21.5 molH2 h−1 molRu−1; apparent quantum yield of 1.3%) and durable (>100 h) visible-light-driven hydrogen evolution has been achieved at neutral pH with a ternary hybrid nanomaterial combining 4-phenylpyridine-capped Ru nanoparticles (RuPP), TiO2 nanocrystals and [Ru(bpy)2(4,4′-(PO3H2)2(bpy))]Cl2 (RuP) using triethanolamine (TEOA) as a sacrificial electron-donor. Photophysical analysis by means of transient absorption spectroscopy has been performed in order to shed light on the kinetics of the electron transfer events and to identify the rate-determining step of the overall photocatalytic process. TiO2 is shown to have a key role as (1) the support aiding the dispersion of the photocatalyst and limiting its agglomeration under turnover conditions and (2) the electron-transfer mediator enabling efficient electron communication between the catalyst and the anchored molecular photoabsorber. Finally, the evolution and fate of the photocatalyst in long-term HER photocatalysis are thoroughly analyzed.

Graphical abstract: TiO2-mediated visible-light-driven hydrogen evolution by ligand-capped Ru nanoparticles

Back to tab navigation

Supplementary files

Article information


Submitted
17 Mar 2020
Accepted
28 May 2020
First published
28 May 2020

Sustainable Energy Fuels, 2020, Advance Article
Article type
Paper

TiO2-mediated visible-light-driven hydrogen evolution by ligand-capped Ru nanoparticles

N. Romero, R. B. Guerra, L. Gil, S. Drouet, I. Salmeron-Sànchez, O. Illa, K. Philippot, M. Natali, J. García-Antón and X. Sala, Sustainable Energy Fuels, 2020, Advance Article , DOI: 10.1039/D0SE00446D

Social activity

Search articles by author

Spotlight

Advertisements