TY - JOUR
T1 - Mixed-metal Zr/Ti MIL-173 porphyrinic metal-organic frameworks as efficient photocatalysts towards solar-driven overall water splitting
AU - Gikonyo, Ben
AU - Montero-Lanzuela, Eva
AU - Baldovi, Herme G.
AU - De, Siddhartha
AU - Journet, Catherine
AU - Devic, Thomas
AU - Guillou, Nathalie
AU - Tiana, Davide
AU - Navalon, Sergio
AU - Fateeva, Alexandra
N1 - Publisher Copyright:
© 2022 The Royal Society of Chemistry.
PY - 2022/11/9
Y1 - 2022/11/9
N2 - Hydrolytically stable MOFs combining Ti(iv) ions and porphyrin ligands are expected to display outstanding photophysical properties, making them ideal photocatalysts for the overall water splitting reaction under solar light. We report here the one-pot synthesis of a microporous MOF built up from a phenolate-based porphyrin ligand and a mixture of Zr(iv) and Ti(iv) ions. A broad set of characterization tools (PXRD, SEM-EDX, TEM, STEM-EDX, solid state UV-vis spectroscopy, XPS, nitrogen sorption) along with DFT calculations were used to confirm that Ti(iv) ions are uniformly inserted in the MIL-173 structure and located in the inorganic building unit. MIL-173(Zr/Ti)-40, containing 40 at% of Ti(iv), exhibits exceptional photocatalytic activity for the overall water splitting into H2 and O2 under simulated sunlight irradiation, without the use of any co-catalyst or sacrificial agent. This material operates efficiently under a photoinduced charge separation mechanism as revealed by photocurrent measurements and photoluminescence spectroscopy. This study provides insights for the development of efficient MOF-based materials as photocatalysts for the solar-driven overall water splitting.
AB - Hydrolytically stable MOFs combining Ti(iv) ions and porphyrin ligands are expected to display outstanding photophysical properties, making them ideal photocatalysts for the overall water splitting reaction under solar light. We report here the one-pot synthesis of a microporous MOF built up from a phenolate-based porphyrin ligand and a mixture of Zr(iv) and Ti(iv) ions. A broad set of characterization tools (PXRD, SEM-EDX, TEM, STEM-EDX, solid state UV-vis spectroscopy, XPS, nitrogen sorption) along with DFT calculations were used to confirm that Ti(iv) ions are uniformly inserted in the MIL-173 structure and located in the inorganic building unit. MIL-173(Zr/Ti)-40, containing 40 at% of Ti(iv), exhibits exceptional photocatalytic activity for the overall water splitting into H2 and O2 under simulated sunlight irradiation, without the use of any co-catalyst or sacrificial agent. This material operates efficiently under a photoinduced charge separation mechanism as revealed by photocurrent measurements and photoluminescence spectroscopy. This study provides insights for the development of efficient MOF-based materials as photocatalysts for the solar-driven overall water splitting.
UR - https://www.scopus.com/pages/publications/85142742601
U2 - 10.1039/d2ta06652a
DO - 10.1039/d2ta06652a
M3 - Article
AN - SCOPUS:85142742601
SN - 2050-7488
VL - 10
SP - 24938
EP - 24950
JO - Journal of Materials Chemistry A
JF - Journal of Materials Chemistry A
IS - 46
ER -
