ORCID Profile
0000-0002-7866-1859
Current Organisation
Australian National University
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Functional materials | Materials engineering | Electronic and magnetic properties of condensed matter; superconductivity | Crystallography | Surface properties of condensed matter | Nanotechnology | Electrical energy storage | Nanofabrication growth and self assembly | Condensed matter characterisation technique development
Publisher: Springer Science and Business Media LLC
Date: 02-2018
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/C9MH01744E
Abstract: Intensive bulk photovoltaic effects are produced in narrow-bandgap centrosymmetric materials by a new strategy based on polar nano-regions.
Publisher: Royal Society of Chemistry (RSC)
Date: 2022
DOI: 10.1039/D2TA01808J
Abstract: A large recoverable energy storage density of 7.59 J cm −3 and high energy storage efficiency of 81.3% are simultaneously achieved in NaNbO 3 –(Sr,Bi)TiO 3 –Bi(Mg,Zr)O 3 relaxor ferroelectric ceramics.
Publisher: American Physical Society (APS)
Date: 27-04-2018
Publisher: Elsevier BV
Date: 08-2018
Publisher: Wiley
Date: 28-02-2020
Publisher: American Chemical Society (ACS)
Date: 04-09-2020
Publisher: American Physical Society (APS)
Date: 21-12-2017
Publisher: American Association for the Advancement of Science (AAAS)
Date: 22-05-2020
Abstract: A lead-free material with better performance was developed to replace the commercially used material for energy conversion.
Publisher: American Physical Society (APS)
Date: 31-08-2020
Publisher: American Chemical Society (ACS)
Date: 17-06-2019
Abstract: The challenges of making high-performance, low-temperature processed, p-type transparent conductors (TCs) have been the main bottleneck for the development of flexible transparent electronics. Though a few p-type transparent conducting oxides (TCOs) have shown promising results, they need high processing temperature to achieve the required conductivity which makes them unsuitable for organic and flexible electronic applications. Copper iodide is a wide band gap p-type semiconductor that can be heavily doped at low temperature (<100 °C) to achieve conductivity comparable or higher than many of the well-established p-type TCOs. However, as-processed CuI loses its transparency and conductivity with time in an ambient condition which makes them unsuitable for long-term applications. Herein, we propose CuI-TiO
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D1TA05699A
Abstract: Bromide-containing long alkylammonium chain organic cations effectly passivate defects on 1.72 eV perovskite film surfaces and greatly enhance both the performance and stability of perovskite solar cells.
Publisher: Royal Society of Chemistry (RSC)
Date: 2023
DOI: 10.1039/D3TC00480E
Abstract: Analysis of the average and local structure in (NH 3 NH 2 )Mg(HCO 2 ) 3 reveals a new source of relaxor ferroelectric like behaviour in a hybrid framework.
Publisher: Wiley
Date: 17-11-2020
Abstract: Dimensional engineering of perovskite solar cells has attracted significant research attention recently because of the potential to improve both device performance and stability. Here, a novel 2D passivation scheme for 3D perovskite solar cells is demonstrated using a mixed cation composition of 2D perovskite based on two different isomers of butylammonium iodide. The dual‐cation 2D perovskite outperforms its single cation 2D counterparts in surface passivation quality, resulting in devices with an impressive open‐circuit voltage of 1.21 V for a perovskite composition with an optical bandgap of ≈1.6 eV, and a ch ion efficiency of 23.27%. Using a combination of surface elemental analysis and valence electron spectra decomposition, it is shown that an in situ interaction between the 2D perovskite precursor and the 3D active layer results in surface intermixing of 3D and 2D perovskite phases, providing an effective combination of defect passivation and enhanced charge transfer, despite the semi‐insulating nature of the 2D perovskite phase. The demonstration of the synergistic interaction of multiple organic spacer cations in a 2D passivation layer offers new opportunities for further enhancement of device performance with mixed dimensional perovskite solar cells.
Publisher: Wiley
Date: 29-04-2020
DOI: 10.1111/JACE.17172
Publisher: Wiley
Date: 14-09-2018
Abstract: The anomolous photovoltaic (APV) effect is an intriguing phenomenon and rarely observed in bulk materials that structurally have an inversion symmetry. Here, the discovery of such an APV effect in a centrosymmetric vanadate, BiVO
Publisher: American Chemical Society (ACS)
Date: 26-12-2020
DOI: 10.1021/ACS.NANOLETT.9B04727
Abstract: Conventional refrigeration methods based on compression-expansion cycles of greenhouse gases are environmentally threatening and cannot be miniaturized. Electrocaloric effects driven by electric fields are especially well suited for implementation of built-in cooling in portable electronic devices. However, most known electrocaloric materials present poor cooling performances near room temperature, contain toxic substances, and require high electric fields. Here, we show that lead-free ferroelectric thin-film bilayers composed of (Bi
Publisher: American Association for the Advancement of Science (AAAS)
Date: 22-01-2021
Abstract: In perovskite solar cells, the insulating nature of passivation layers needed to boost open-circuit voltage also increases the series resistance of the cell and limits the fill factor. Most improvements in power conversion efficiency have come from higher open-circuit voltage, with most fill factor improvements reported for very small-area cells. Peng et al. used a nanostructured titanium oxide electron transport layer to boost the fill factor of larger-area cells (1 square centimeter) to 0.84 by creating local regions with high conductivity. Science , this issue p. 390
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D1TA03894J
Abstract: Modulating the relaxor ferroelectric–paraelectric phase transition behavior in non-relaxor ferroelectrics via composition design stands for a new strategy for realizing large electrocaloric temperature change over a wide temperature window.
Publisher: American Physical Society (APS)
Date: 22-10-2018
Publisher: American Association for the Advancement of Science (AAAS)
Date: 23-06-2023
Abstract: The trade-off between activity and stability of oxygen evolution reaction (OER) catalysts in proton exchange membrane water electrolyzer (PEMWE) is challenging. Crystalline IrO 2 displays good stability but exhibits poor activity amorphous IrO x exhibits outstanding activity while sacrificing stability. Here, we combine the advantages of these two materials via a lattice water–incorporated iridium oxide (IrO x · n H 2 O) that has short-range ordered structure of hollandite-like framework. We confirm that IrO x · n H 2 O exhibits boosted activity and ultrahigh stability of hours (~8 months) with a record-high stability number of 1.9 × 10 7 n oxygen n Ir −1 . We evidence that lattice water is active oxygen species in sustainable and rapid oxygen exchange. The lattice water–assisted modified OER mechanism contributes to improved activity and concurrent stability with no apparent structural degradation, which is different to the conventional adsorbate evolution mechanism and lattice oxygen mechanism. We demonstrate that a high-performance PEMWE with IrO x · n H 2 O as anode electrocatalyst delivers a cell voltage of 1.77 V at 1 A cm −2 for 600 hours (60°C).
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C7EE01096F
Abstract: Reducing interface recombination boosts the V oc for perovskite solar cells.
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 02-2021
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/D0CE00425A
Abstract: High temperature phase transitions from Pna 2 1 to P 4/ mbm are observed for all compositions, and transition temperatures increase with Zr content.
Publisher: Elsevier BV
Date: 02-2023
Publisher: Wiley
Date: 27-01-2022
Abstract: Controlling the interaction between multiple ion fluxes is a major challenge that h ers the adoption of post‐Li intercalation battery systems, which offer a multifold increase in energy density over existing technologies. Here, a dual‐ion flux management strategy is introduced to simultaneously control the distribution of Li and polysulfide ions in high‐energy Li–S batteries. This approach enables long‐term use of high S‐loading cathodes with 13.6 mg sulfur cm −2 , achieving 9 mAh cm −2 areal capacity with 73% capacity retention for 1000 charging/discharging cycles. The battery system relies on the use of a multiscale membrane, with comparable size to existing battery separators, which simultaneously acts as an atomic redisperser for Li ions, dielectric and mechanical separator, polysulfide barrier, and extended cathode. Combined characterization and modeling reveal that the membrane is stable down to .0 V versus Li + /Li and result in a uniform Li‐ion flux to the anode and effective polysulfide confinement and reutilization. The potential of this approach for application is demonstrated by the fabrication of stable pouch cells with a horizontal surface of 40 cm 2 and 6.8 mAh cm −2 capacity. These findings provide an exemplification of the potential for effective multi‐ion flux management for future energy storage and emerging electrochemical systems.
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C9MH00516A
Abstract: The introduction of defect-pairs into centrosymmetric rutile TiO 2 produces a new form of collective nonlinear electrical polarization.
Publisher: American Chemical Society (ACS)
Date: 08-08-2018
Abstract: In this report, a ferroelectric-luminescent heterostructure is designed to convert infrared light into electric power. We use BiFeO
Publisher: American Chemical Society (ACS)
Date: 04-04-2017
Publisher: American Chemical Society (ACS)
Date: 09-03-2018
Abstract: The effect of above-band gap photons on the domains of the BiFeO
Publisher: American Chemical Society (ACS)
Date: 24-05-2023
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D1TA02699B
Abstract: A defect-engineering strategy is reported to enhance the photovoltaic performance of BiNbO 4 . Synergetic effects: enhanced light absorption, ferroelectric-like depolarization and interfacial polarization on BiNbO 4 homojunction lead to an increase in the photovoltaic effects.
Publisher: American Chemical Society (ACS)
Date: 13-12-2021
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D1CP03159G
Abstract: A self-consistent field theory formalism based on the wormlike chain model is developed to investigate the stress–strain relation for mesostructures in diblock copolymers under the influence of chain rigidity.
Publisher: Wiley
Date: 10-07-2018
Publisher: American Chemical Society (ACS)
Date: 03-11-2020
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/C9TA14153G
Abstract: The 2D 23 Na 3QMAS NMR analyses provide new insights into the crystalline structure of K 0.5 Na 0.5 NbO 3 nanostructures on the microscopic scale, which are critical to understand the functional properties of these nano-materials.
Publisher: Springer Science and Business Media LLC
Date: 04-06-2020
DOI: 10.1038/S41467-020-15510-7
Abstract: Reversible structural transformations of porous coordination frameworks in response to external stimuli such as light, electrical potential, guest inclusion or pressure, amongst others, have been the subject of intense interest for applications in sensing, switching and molecular separations. Here we report a coordination framework based on an electroactive tetrathiafulvalene exhibiting a reversible single crystal-to-single crystal double [2 + 2] photocyclisation, leading to profound differences in the electrochemical, optical and mechanical properties of the material upon light irradiation. Electrochemical and in situ spectroelectrochemical measurements, in combination with in situ light-irradiated Raman spectroscopy and atomic force microscopy, revealed the variable mechanical properties of the framework that were supported using Density Functional Theory calculations. The reversible structural transformation points towards a plethora of potential applications for coordination frameworks in photo-mechanical and photoelectrochemical devices, such as light-driven actuators and photo-valves for targeted drug delivery.
Publisher: Elsevier BV
Date: 03-2024
Publisher: AIP Publishing
Date: 02-04-2018
DOI: 10.1063/1.5020424
Abstract: Both high pyroelectric properties and good temperature stability of ferroelectric materials are desirable when used for applications in infrared thermal detectors. In this work, we report lead-free ternary 0.97(0.99Bi0.5Na0.5TiO3-0.01BiAlO3)-0.03K0.5Na0.5NbO3 (BNT-BA-KNN) ceramics, which not only exhibits a large pyroelectric coefficient (p ∼ 3.7 × 10−8 C cm−2 K−1) and figures of merit (Fi, Fv, and Fd) but also shows excellent thermal stable properties. At room temperature, Fi, Fv, and Fd are determined as high as 1.32 × 10−10 m/V, 2.89 × 10−2 m2/C, and 1.15 × 10−5 Pa−1/2 at 1 kHz and 1.32 × 10−10 m/V, 2.70 × 10−2 m2/C, and 1.09 × 10−5 Pa−1/2 at 20 Hz, respectively. During the temperature range of RT to 85 °C, the achieved p, Fi, Fv, and Fd do not vary too much. The high depolarization temperature and the undispersed ferroelectric-ergodic relaxor phase transition with a sharp pyroelectric coefficient peak value of ∼400 × 10−8 C cm−2 K−1 are suggested to be responsible for this thermal stability, which ensures reliable actual operation. The results reveal the BNT-BA-KNN ceramics as promising lead-free candidates for infrared thermal detector applications.
Publisher: American Chemical Society (ACS)
Date: 29-07-2020
Publisher: AIP Publishing
Date: 17-04-2018
DOI: 10.1063/1.5020305
Abstract: A simple, near-ambient pressure solid-state method was developed to nominally synthesize BiFe0.5Cr0.5O3. The procedure allowed the gram-scale production of multiferroic s les with appreciable purity and large amounts of Cr incorporation that were suitable for systematic structural investigation by neutron, X-ray, and electron diffraction in tandem with physical characterization of magnetic and ferroelectric properties. The rhombohedrally distorted perovskite phase was assigned to the space group R3c by way of X-ray and neutron powder diffraction analysis. Through a combination of magnetometry and muon spin relaxation, it is evident that there is magnetic ordering in the BFCO phase consistent with G-type antiferromagnetism and a TN ∼ 400 K. There is no clear evidence for chemical ordering of Fe and Cr in the B-site of the perovskite structure and this result is rationalized by density functional theory and bond valence simulations that show a lowered energy associated with a B-site disordered structure. We believe that our contribution of a new, low-complexity method for the synthesis of BFO type s les, and dialogue about realising certain types of ordering in oxide perovskite systems, will assist in the further development of multiferroics for next-generation devices.
Publisher: International Union of Crystallography (IUCr)
Date: 21-06-2019
DOI: 10.1107/S2052252519007711
Abstract: Functional materials are of critical importance to electronic and smart devices. A deep understanding of the structure–property relationship is essential for designing new materials. In this work, instead of utilizing conventional atomic coordinates, a symmetry-mode approach is successfully used to conduct structure refinement of the neutron powder diffraction data of (1− x )AgNbO 3 – x LiTaO 3 (0 ≤ x ≤ 0.09) ceramics. This provides rich structural information that not only clarifies the controversial symmetry assigned to pure AgNbO 3 but also explains well the detailed structural evolution of (1− x )AgNbO 3 – x LiTaO 3 (0 ≤ x ≤ 0.09) ceramics, and builds a comprehensive and straightforward relationship between structural distortion and electrical properties. It is concluded that there are four relatively large- litude major modes that dominate the distorted Pmc 2 1 structure of pure AgNbO 3 , namely a Λ3 antiferroelectric mode, a T4+ a − a − c 0 octahedral tilting mode, an H2 a 0 a 0 c + / a 0 a 0 c − octahedral tilting mode and a Γ4− ferroelectric mode. The H2 and Λ3 modes become progressively inactive with increasing x and their destabilization is the driving force behind the composition-driven phase transition between the Pmc 2 1 and R 3 c phases. This structural variation is consistent with the trend observed in the measured temperature-dependent dielectric properties and polarization–electric field ( P - E ) hysteresis loops. The mode crystallography applied in this study provides a strategy for optimizing related properties by tuning the litudes of the corresponding modes in these novel AgNbO 3 -based (anti)ferroelectric materials.
Publisher: AIP Publishing
Date: 02-12-2022
DOI: 10.1063/5.0111569
Abstract: Lead-based ferroelectric materials dominate the electronic industry due to their possible applications in sensors, actuators, advanced storage materials, microwave devices, and MEMS. Due to the toxicity of lead, there is a need for the development of environmentally compatible alternatives. Lead-free ternary solid solutions of (1−2x)K0.5Bi0.5TiO3-xBaTiO3-xLiNbO3 (KBLN100x) with x = 0.03, 0.05, 0.07, and 0.09 are synthesized using a standard solid-state reaction method. X-ray diffraction studies confirm the pseudocubic structure of the s les. Structural, Raman, dielectric and piezoelctric studies indicate that a normal to relaxor ferroelectric transition occurs as dopant concentration increases, and it is attributed to the increase in charge fluctuation and site disorder that resulted in the reduction in correlation lengths of the inbuilt dipole moments. A recoverable energy density of 1.3 J/cm3 was achieved for the KBLN7 s le, making it an attractive candidate in the energy storage realm. A strain value of 0.17% with Smax/Emax of 218 pm/V is observed for KBLN3 s le, indicating that K0.5Bi0.5TiO3 (KBT)-based systems can be used for actuator applications on further improvement. The normal-relaxor crossover of KBT with appropriate dopants indicates that KBT-based systems are efficient for both actuator and energy storage applications on improvising and tuning as required.
Publisher: Wiley
Date: 19-09-2023
Start Date: 2024
End Date: 12-2026
Amount: $456,547.00
Funder: Australian Research Council
View Funded ActivityStart Date: 2023
End Date: 12-2023
Amount: $909,754.00
Funder: Australian Research Council
View Funded ActivityStart Date: 07-2023
End Date: 06-2026
Amount: $466,114.00
Funder: Australian Research Council
View Funded Activity