ORCID Profile
0000-0002-7275-7104
Current Organisation
Institute for Frontier Materials, Deakin University
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Publisher: Elsevier BV
Date: 12-2023
Publisher: Wiley
Date: 29-12-2023
Abstract: Two‐dimensional (2D) transition metal dichalcogenides and graphene have revealed promising applications in optoelectronic and energy storage and conversion. However, there are rare reports of modifying the light‐to‐heat transformation via preparing their heterostructures for solar steam generation. In this work, commercial WS 2 and sucrose are utilized as precursors to produce 2D WS 2 ‐O‐doped‐graphene heterostructures (WS 2 ‐O‐graphene) for solar water evaporation. The WS 2 ‐O‐graphene evaporators demonstrate excellent average water evaporation rate (2.11 kg m −2 h −1 ) and energy efficiency (82.2%), which are 1.3‐ and 1.2‐fold higher than WS 2 and O‐doped graphene‐based evaporators, respectively. Furthermore, for the real seawater with different pH values (pH 1 and 12) and rhodamine B pollutants, the WS 2 ‐O‐graphene evaporators show great average evaporation rates (≈2.08 and 2.09 kg m −2 h −1 , respectively) for producing freshwater with an extremely low‐grade of dye residual and nearly neutral pH values. More interestingly, due to the self‐storage water ability of WS 2 ‐O‐graphene evaporators, water evaporation can be implemented without the presence of bulk water. As a result, the evaporation rate reaches 3.23 kg m −2 h −1 , which is ≈1.5 times higher than the regular solar water evaporation system. This work provides a new approach for preparing 2D transition metal dichalcogenides and graphene heterostructures for efficient solar water evaporation.
Publisher: Wiley
Date: 08-08-2022
Abstract: Inadequate mass transportation of semipermeable membranes causes poor osmotic energy conversion from salinity‐gradient. Here, the lamellar graphene oxide membranes (GOMs) constructed with numerous fusiform‐like nanochannels, that are pre‐filled with negatively charged polyanion electrolytes, to both enhance the ion permeability and ion selectivity of the membrane for energy harvest from the salinty gradient, were developed. The as‐prepared membrane achieved the maximum output power density of ∼4.94 W m −2 under a 50 fold salinity gradient, which is 3.5 fold higher than that of pristine GOM. The enhancement could be ascribed to the synergistic impact of the expanded nanochannels and the enhanced space charge density. Via feeding with the artificial salinity water and monovalent cation electrolytes, the system could realise the power output up to 14.7 W m −2 and 34.1 W m −2 , respectively. Overall, this material design strategy could provide an alternative concept to effectively enhance ion transport of other two‐dimensional (2D) membranes for specific purposes.
Publisher: Elsevier BV
Date: 07-2022
Publisher: Wiley
Date: 07-12-2023
Abstract: 2D nanostructured materials have been applied for water purification in the past decades due to their excellent separation and adsorption performance. However, the functional 2D nanostructured molybdenum trioxide (MoO 3 )has rarely been reported for the removal of dyes. Here, functionalized MoO 3 (F‐MoO 3 ) nanosheets are successfully fabricated with a high specific surface area (106 cc g −1 ) by a one‐step mechanochemical exfoliation method as a highly effective adsorbent for removing dyes from water. According to the Raman, X‐ray photoelectron spectroscopy, Fourier transform infrared (FTIR), and selected area electron diffraction analysis, functional groups (hdroxyl groups, amide groups, amine groups and amino groups) are identified in the as‐prepared F‐MoO 3 nanosheets. The attached functional groups not only facilitate the dispersal ability of F‐MoO 3 nanosheets but also enhance the adsorption capacities. Thus, the performance (up to 556 mg g −1 when the initial concentration of Rhodamine B solution is 100 mg L −1 ) of as‐prepared F‐MoO 3 nanosheets is almost two times higher than other reported MoO 3 materials. Furthermore, the FTIR spectra, isotherm, and several factors (e.g., adsorbent dosage and adsorbate dosage) are also systematically investigated to explore the adsorption mechanism. Therefore, this work demonstrates that the F‐MoO 3 nanosheets are a promising candidate for wastewater treatment.
Publisher: Elsevier BV
Date: 09-2023
Publisher: Elsevier BV
Date: 10-2022
Publisher: Wiley
Date: 13-06-2022
Abstract: Higher‐metal (HM) nitrides are a fascinating family of materials being increasingly researched due to their unique physical and chemical properties. However, few focus on investigating their application in a solar steam generation because the controllable and large‐scale synthesis of these materials remains a significant challenge. Herein, it is reported that higher‐metal molybdenum nitride nanosheets (HM‐Mo 5 N 6 ) can be produced at the gram‐scale using amine‐functionalized MoS 2 as precursor. The first‐principles calculation confirms amine‐functionalized MoS 2 nanosheet effectively lengthens the bonds of MoS leading to a lower bond binding energy, promoting the formation of MoN bonds and production of HM‐Mo 5 N 6 . Using this strategy, other HM nitride nanosheets, such as W 2 N 3 , Ta 3 N 5 , and Nb 4 N 5 , can also be synthesized. Specifically, under one simulated sunlight irradiation (1 kW m ‐2 ), the HM‐Mo 5 N 6 nanosheets are heated to 80 °C within only ≈24 s (0.4 min), which is around 78 s faster than the MoS 2 s les (102 s/1.7 min). More importantly, HM‐Mo 5 N 6 nanosheets exhibit excellent solar evaporation rate (2.48 kg m ‐2 h ‐1 ) and efficiency (114.6%), which are 1.5 times higher than the solar devices of MoS 2 /MF.
Location: No location found
Location: Australia
No related grants have been discovered for Yuxi Ma.