ORCID Profile
0000-0002-2319-2813
Current Organisations
Nanyang Technological University
,
University of New South Wales
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Publisher: Elsevier
Date: 2015
Publisher: Royal Society of Chemistry (RSC)
Date: 2013
DOI: 10.1039/C2TA00351A
Publisher: Elsevier BV
Date: 09-2017
Publisher: Elsevier BV
Date: 09-2013
Publisher: American Chemical Society (ACS)
Date: 29-07-2011
DOI: 10.1021/IE200039W
Publisher: Elsevier BV
Date: 10-2018
Publisher: Elsevier BV
Date: 2018
Publisher: Royal Society of Chemistry (RSC)
Date: 2012
DOI: 10.1039/C1CE05965C
Publisher: Elsevier BV
Date: 05-2007
Publisher: Elsevier BV
Date: 06-2005
Publisher: Elsevier BV
Date: 2008
Publisher: Elsevier BV
Date: 11-2013
Publisher: Wiley
Date: 21-06-2017
Publisher: Informa UK Limited
Date: 30-09-2015
DOI: 10.1080/09593330.2014.960478
Abstract: Ship-borne ballast water contributes significantly to the transfer of non-indigenous species across aquatic environments. To reduce the risk of bio-invasion, ballast water should be treated before discharge. In this study, the efficiencies of several conventional and advanced oxidation processes were investigated for potential ballast water treatment, using a marine dinoflagellate species, Scripsiella trochoidea, as the indicator organism. A stable and consistent culture was obtained and treated by ultraviolet (UV) light, ozone (O3), hydrogen peroxide (H2O2), and their various combinations. UV apparently inactivated the cells after only 10 s of irradiation, but subsequently photo-reactivation of the cells was observed for all methods involving UV. O3 exhibited 100% inactivation efficiency after 5 min treatment, while H2O2 only achieved maximum 80% inactivation in the same duration. Combined methods, e.g. UV/O3 and UV/H2O2, were found to inhibit photo-reactivation and improve treatment efficiency to some degree, indicating the effectiveness of using combined treatment processes. The total residual oxidant (TRO) levels of the methods were determined, and the results indicated that UV and O3 generated the lowest and highest TRO, respectively. The synergic effect of combined processes on TRO generation was found to be insignificant, and thus UV/O3 was recommended as a potentially suitable treatment process for ballast water.
Publisher: Springer Science and Business Media LLC
Date: 28-07-2015
DOI: 10.1007/S11356-015-5095-1
Abstract: The feasibility of cyanobacteria removal from freshwater by a dielectric barrier discharge (DBD) process is investigated. Seven commercial and environmental cyanobacteria strains, as well as real algae-laden water, were tested. The removal of the cyanobacteria was evaluated by analyzing the changes in chlorophyll a content, total organic carbon (TOC) concentration, and cell morphology. Nearly total removal of chlorophyll a was achieved within 20 min, while the TOC analysis exhibited an increase-decrease-increase trend in 60 min of treatment, likely due to the oxidation of intracellular and intercellular materials. Observation under light microscopy revealed the disruption of intracellular and intercellular structures within 5 min of DBD treatment and thus supported the TOC analysis. Increasing the salinity of the medium from 0 to 5 parts per thousand (ppt) improved treatment efficiency, where similar level of chlorophyll a removal (around 93%) was achieved in only half the treatment time. Application of DBD on real algae-laden water from a fish farm yielded higher treatment efficiency than in synthetic medium, indicating the promising application of DBD as a means to control cyanobacteria bloom in fresh and estuary water bodies.
Publisher: Elsevier BV
Date: 04-2012
Publisher: Wiley
Date: 07-11-2013
Abstract: Electrode materials: Ultrahigh-power insertion-type anodes are developed by simply decorating Pd nanoparticles on commercially available porous carbon.
Publisher: Elsevier BV
Date: 10-09-2005
Publisher: Elsevier BV
Date: 07-2016
Publisher: MDPI AG
Date: 2019
Abstract: Segmented cells enable real time visualization of the flow distribution in vanadium redox flow batteries by local current or voltage mapping. The lateral flow of current within thick porous electrodes, however, impairs the local resolution of the detected signals. In this study, the open circuit voltage immediately after the cessation of charge/discharge is used for the mapping of reactant conversion. This quantity is not h ered by lateral flow of current and can be conveniently transformed to the corresponding state of charge. The difference between theoretically calculated and experimentally determined conversion (change in the state of charge) across the electrode is used to determine local variations in conversion efficiency. The method is validated by systematic experiments using electrodes with different modifications, varying current densities and flow configurations. The procedure and the interpretation are simple and scalable to any size of flow cell.
Publisher: Elsevier BV
Date: 03-2019
Publisher: Elsevier BV
Date: 12-2012
Publisher: Elsevier BV
Date: 02-2019
Publisher: Elsevier BV
Date: 04-2004
Publisher: Elsevier BV
Date: 12-2019
Publisher: MDPI AG
Date: 03-08-2019
DOI: 10.3390/EN12153005
Abstract: The safe, efficient and durable utilization of a vanadium redox flow battery (VRB) requires accurate monitoring of its state of charge (SOC) and capacity decay. This paper focuses on the unbiased model parameter identification and model-based monitoring of both the SOC and capacity decay of a VRB. Specifically, a first-order resistor-capacitance (RC) model was used to simulate the dynamics of the VRB. A recursive total least squares (RTLS) method was exploited to attenuate the impact of external disturbances and accurately track the change of model parameters in realtime. The RTLS-based identification method was further integrated with an H-infinity filter (HIF)-based state estimator to monitor the SOC and capacity decay of the VRB in real-time. Experiments were carried out to validate the proposed method. The results suggested that the proposed method can achieve unbiased model parameter identification when unexpected noises corrupt the current and voltage measurements. SOC and capacity decay can also be estimated accurately in real-time without requiring additional open-circuit cells.
Publisher: Elsevier BV
Date: 04-2018
Publisher: Elsevier BV
Date: 28-01-2005
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C8TA00464A
Abstract: Binder free titanium carbide decorated graphite felt as high performance negative electrode in vanadium redox flow battery.
Publisher: Elsevier BV
Date: 2014
Publisher: Royal Society of Chemistry (RSC)
Date: 2011
DOI: 10.1039/C1RA00281C
Publisher: Elsevier BV
Date: 02-2019
Publisher: Elsevier BV
Date: 11-2016
Publisher: Elsevier BV
Date: 07-2013
Publisher: Wiley
Date: 14-11-2012
Abstract: Ultrathin single-crystalline V2 O5 ·0.76H2 O nanosheets with a thickness of 1.5-2.6 nm are prepared on the basis of molecular-level 'oriented attachment' through special sol-gel chemistry. The initial formation of 3-7 nm nanodiscs by confining the condensation reactions within the ab plane is critical to form nanosheets. As a proof-of-concept, these nanosheets exhibit good properties for hydrogen sensors and supercapacitors.
Publisher: MDPI AG
Date: 11-2018
Abstract: This study presents the application of pyrolyzed spent coffee beans as a potential electrode material to replace commercial bipolar graphite plate in vanadium redox flow batteries (VRB). The results indicate that the biochar obtained from spent coffee beans shows relatively good electrochemical charge transfer kinetics of vanadium redox reactions as well as generates higher energy and voltage efficiency in a static cell test when compared to TF6 bipolar graphite plate. Additionally, the biochar was activated via steam at various activation times to increase its surface area, and their effect on the kinetics of the electrochemical reactions was investigated. The activated carbon did not exhibit any improvement neither in electron transfer kinetics nor in the battery efficiency, despite their increased surface area. The performed studies demonstrate that the biochar obtained from spent coffee beans can be a low-cost electrode material for VRB with improved performance characteristics.
Publisher: Wiley
Date: 27-10-2021
Publisher: Elsevier BV
Date: 09-2012
Publisher: Elsevier BV
Date: 02-2008
Publisher: Elsevier BV
Date: 03-2007
Publisher: Elsevier BV
Date: 2013
Publisher: IOP Publishing
Date: 15-04-2009
Publisher: Elsevier BV
Date: 03-2017
Publisher: Wiley
Date: 27-10-2015
Publisher: Elsevier BV
Date: 03-2007
Publisher: Elsevier BV
Date: 07-2014
Publisher: Royal Society of Chemistry (RSC)
Date: 2012
DOI: 10.1039/C1RA00698C
Publisher: American Chemical Society (ACS)
Date: 30-05-2013
DOI: 10.1021/NN4022263
Abstract: Olivine-type LiMPO4 (M = Fe, Mn, Co, Ni) has become of great interest as cathodes for next-generation high-power lithium-ion batteries. Nevertheless, this family of compounds suffers from poor electronic conductivities and sluggish lithium diffusion in the [010] direction. Here, we develop a liquid-phase exfoliation approach combined with a solvothermal lithiation process in high-pressure high-temperature (HPHT) supercritical fluids for the fabrication of ultrathin LiMPO4 nanosheets (thickness: 3.7-4.6 nm) with exposed (010) surface facets. Importantly, the HPHT solvothermal lithiation could produce monodisperse nanosheets while the traditional high-temperature calcination, which is necessary for cathode materials based on high-quality crystals, leads the formation of large grains and aggregation of the nanosheets. The as-synthesized nanosheets have features of high contact area with the electrolyte and fast lithium transport (time diffusion constant in at the microsecond level). The estimated diffusion time for Li(+) to diffuse over a [010]-thickness of <5 nm (L) was calculated to be less than 25, 2.5, and 250 μs for LiFePO4, LiMnPO4, and LiCoPO4 nanosheets, respectively, via the equation of t = L(2)/D. These values are about 5 orders of magnitude lower than the corresponding bulk materials. This results in high energy densities and excellent rate capabilities (e.g., 18 kW kg(-1) and 90 Wh kg(-1) at a 80 C rate for LiFePO4 nanosheets).
Publisher: Elsevier BV
Date: 2015
Publisher: Elsevier BV
Date: 11-2013
Publisher: Elsevier BV
Date: 02-2010
Publisher: Elsevier BV
Date: 09-2013
Publisher: Wiley
Date: 13-12-2012
Abstract: Double-wall amorphous FePO4 nanotubes are prepared by an oil-phase chemical route. The inward diffusion of vacancies and outward diffusion of ions through passivation layers result in double-wall nanotubes with thin walls. Such a process can be extended to prepare hollow polydedral nanocrystals and hollow ellipsoids. The double-wall FePO4 nanotubes show interesting cathode performance in Li ion batteries.
Publisher: Elsevier BV
Date: 06-2018
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C5NR04126K
Abstract: In this review, we will be casting light on the recent advances in the synthesis of nanostructured vanadium-based cathodes, such as V 2 O 5 , LiV 3 O 8 , VO 2 (B) and Li 3 V 2 (PO 4 ) 3 .
Publisher: Wiley
Date: 20-12-2012
Publisher: Royal Society of Chemistry (RSC)
Date: 2012
DOI: 10.1039/C2NR30525A
Abstract: A simple, non-template, non-surfactant and environmentally friendly hydrothermal method is presented based on the controlled release of the reactants into the reaction solvents to induce slow nucleation and growth of three-dimensional hierarchical nanostructures of transition metal oxides. This method is a general approach, which can be used to prepare Co(3)O(4), CuO, and Ni(OH)(2)/NiO. These metal oxides with hierarchical nanostructures can be used as anode materials for lithium-ion batteries with good Li storage performance, e.g. high specific capacities and stable cyclability.
Publisher: Elsevier BV
Date: 02-2017
Publisher: Elsevier BV
Date: 04-2011
DOI: 10.1016/J.JHAZMAT.2011.01.088
Abstract: An organic-free sol-gel method was developed to synthesize crack-free, high surface roughness and visible-light-active C-N-codoped TiO(2) films. These films were subsequently evaluated for its photodegradation efficient using stearic acid as the model pollutant compound. The current approach avoids the use of hazardous organic solvents and employs carbon black as the carbon source as well as a template to increase the surface roughness. The presence of carbon and nitrogen species in TiO(2) was studied and discussed. The concentrations of carbon and nitrogen dopants in the TiO(2) films were affected by calcination temperature and the concentration of carbon black. Optimal visible light photocatalytic activity was observed for C-N-codoped TiO(2) film at 10.0 wt.% C, which was more than double that of the N-doped TiO(2) film. The enhancement in visible light photocatalytic activities of the C-N-codoped TiO(2) films was attributed to the synergistic effects of carbon and nitrogen dopants, and high surface roughness of the prepared films.
Publisher: Elsevier BV
Date: 06-2016
Publisher: Elsevier
Date: 2013
Publisher: Elsevier BV
Date: 2007
Publisher: Royal Society of Chemistry (RSC)
Date: 2011
DOI: 10.1039/C1NR10879D
Abstract: Reduced graphene oxide (rGO) supported highly porous polycrystalline V(2)O(5) spheres (V(2)O(5)/rGO) were prepared by using a solvothermal approach followed by an annealing process. Initially, reduced vanadium oxide (rVO) nanoparticles with sizes in the range of 10-50 nm were formed through heterogeneous nucleation on rGO sheets during the solvothermal process. These rVO nanoparticles were oxidized to V(2)O(5) after the annealing process in air at 350 °C and assembled into polycrystalline porous spheres with sizes of 200-800 nm. The weight ratio between the rGO and V(2)O(5) is tunable by changing the weight ratio of the precursors, which in turn affects the morphology of V(2)O(5)/rGO composites. The V(2)O(5)/rGO composites display superior cathode performances with highly reversible specific capacities, good cycling stabilities and excellent rate capabilities (e.g. 102 mA h g(-1) at 19 C).
Publisher: MDPI AG
Date: 19-06-2012
Publisher: Royal Society of Chemistry (RSC)
Date: 2013
DOI: 10.1039/C2NR33422D
Abstract: Few-layer V(2)O(5) nanosheets with a thickness of 2.1-3.8 nm have been successfully synthesized in this work via a simple and scalable liquid exfoliation technique. The unique nanostructure allows the high-rate transportation of lithium ions and electrons due to very short diffusion paths provided by this ultrathin thickness, resulting in Li-ion cathodes with remarkable energy and power densities.
Publisher: Royal Society of Chemistry (RSC)
Date: 2012
DOI: 10.1039/C2RA20058A
Publisher: Elsevier BV
Date: 07-2011
Publisher: Wiley
Date: 06-11-2016
Publisher: Elsevier BV
Date: 11-2009
Publisher: Springer Science and Business Media LLC
Date: 07-07-2009
Publisher: Elsevier BV
Date: 10-2018
Publisher: Wiley
Date: 29-11-2013
Abstract: Porous, hollow metal carbonate microstructures show many unique properties, and are attractive for various applications. Herein, we report the first demonstration of a general strategy to synthesize hollow metal carbonate structures, including porous MnCO3 hollow cubics, porous CoCO3 hollow rhombuses and porous CaCO3 hollow capsules. For ex le, the porous, hollow MnCO3 microcubes show larger Brunauer-Emmett-Teller (BET) surface areas of 359.5 m(2) g(-1) , which is much larger than that of solid MnCO3 microcubics (i.e., 12.03 m(2) g(-1) ). As a proof of concept, these porous MnCO3 hollow microcubes were applied to water treatment and exhibited an excellent ability to remove organic pollutants in waste water owing to their hollow structure and large specific surface area.
Publisher: American Chemical Society (ACS)
Date: 14-10-2013
DOI: 10.1021/AM403572K
Abstract: Ultrathin 2D nanostructures have shown many unique properties and are attractive for various potential applications. Here, we demonstrated a strategy to synthesize ultrathin VOx nanosheets. The as-obtained ultrathin VOx nanosheets showed a large Brunauer-Emmett-Teller (BET) surface area of 136.3 m2 g(-1), which is much larger than that of 1D multilayer VOx nanotubes. As a proof of concept, these hydrophilic ultrathin nanosheets were applied in water treatment and exhibited excellent absorption capability to remove Rhodamine B (RhB) in wastewater owing to their large specific surface area, good hydrophilic property, and more negative zeta potential. In addition, this method could be generalized to prepare other 2D nanostructures with great potential for various attractive applications.
Publisher: American Chemical Society (ACS)
Date: 31-05-2012
DOI: 10.1021/JP303120D
Publisher: Elsevier BV
Date: 07-2011
Publisher: Elsevier BV
Date: 05-2018
Publisher: Elsevier
Date: 2015
Publisher: Elsevier BV
Date: 03-2016
No related grants have been discovered for TUTI MARIANA LIM.