https://nova.newcastle.edu.au/vital/access/ /manager/Index ${session.getAttribute("locale")} 5 Reactive sites rich porous tubular yolk-shell g-C₃N₄ via precursor recrystallization mediated microstructure engineering for photoreduction https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:36349 13C isotopic labeling. This work develops precursor microstructure engineering as a promising strategy for rational design of unordinary g-C₃N₄ structure for renewable energy production.]]> Tue 19 Sep 2023 15:05:56 AEST ]]> Ferroelectric polarization promoted bulk charge separation for highly efficient CO₂ photoreduction of SrBi₄Ti₄O₁₅ https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:34851 4Ti4O15 as a robust photocatalyst for efficient CO2 reduction. In the absence of co-catalysts and sacrificial agents, the annealed SrBi4Ti4O15 nanosheets with the strongest ferroelectricity cast a prominent photocatalytic CO₂ reduction activity for CH₄ evolution with a rate of 19.8 μmol h−1 g−1 in the gas-solid reaction system, achieving an apparent quantum yield (AQY) of 1.33% at 365 nm, outperforming most of the reported photocatalysts. The ferroelectric hysteresis loop, piezoresponse force microscopy (PFM) and ns-level time-resolved fluorescence spectra uncover that the outstanding CO2 photoreduction activity of SrBi4Ti4O15 mainly stems from the strong ferroelectric spontaneous polarization along [100] direction, which allows efficient bulk charge separation along opposite direction. DFT calculations also disclose that both electrons and holes show the smallest effective masses along a axis, verifying the high mobility of charge carriers facilitated by ferroelectric polarization. This study suggests that the traditionally semiconducting ferroelectric materials that have long been studied as ferro/piezoelectric ceramics now may be powerfully applied in the photocatalytic field to deal with the growing energy crisis.]]> Mon 08 Nov 2021 09:54:09 AEDT ]]> Surface-halogenation-induced atomic-site activation and local charge separation for superb CO₂ photoreduction https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:36540 Mon 01 Jun 2020 12:07:38 AEST ]]> Macroscopic spontaneous polarization and surface oxygen vacancies collaboratively boosting CO2 photoreduction on BiOIO3 single crystals https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:40091 2 photoreduction by coupling macroscopic spontaneous polarization and surface oxygen vacancies (OVs) of BiOIO3 single crystals is reported. The oriented growth of BiOIO3 single-crystal nanostrips along the [001] direction, ensuing substantial well-aligned IO3 polar units, renders a large enhancement for the macroscopic polarization electric field, which is capable of driving the rapid separation and migration of charges from bulk to surface. Meanwhile the introduction of surface OVs establishes a local electric field for charge migration to catalytic sites on the surface of BiOIO3 nanostrips. Highly polarized BiOIO3 nanostrips with ample OVs demonstrate outstanding CO2 reduction activity for CO production with a rate of 17.33 μmol g-1 h-1 (approximately ten times enhancement) without any sacrificial agents or cocatalysts, being one of the best CO2 reduction photocatalysts in the gas-solid system reported so far. This work provides an integrated solution to governing charge movement behavior on the basis of collaborative polarization from bulk and surface.]]> Fri 22 Jul 2022 13:41:21 AEST ]]> Thickness-Dependent Facet Junction Control of Layered BiOIO3 Single Crystals for Highly Efficient CO2 Photoreduction https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:41820 Fri 12 Aug 2022 12:52:30 AEST ]]>