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30 results on '"Noonan, Owen"'

2. Rechargeable aluminum–selenium batteries with high capacity† †Electronic supplementary information (ESI) available. See DOI: 10.1039/c8sc01054d

Author

Huang, Xiaodan, Liu, Yang, Liu, Chao, Zhang, Jun, Noonan, Owen, and Yu, Chengzhong

Subjects
inorganic chemicals, Chemistry, food and beverages, complex mixtures
Abstract

An aluminum–selenium battery powered by the reversible redox reaction of Se/Se2Cl2 has been developed for the first time., Rechargeable aluminum (Al) batteries are emerging as a promising post lithium-ion battery technology. Herein, we demonstrate a conceptually new design of rechargeable aluminum–selenium (Al–Se) batteries by understanding the selenium chemistry and controlling the electrode reaction. The Al–Se battery consists of a composite cathode including selenium nanowires and mesoporous carbon (CMK-3) nanorods, an Al metal anode and chloroaluminate ionic liquid electrolyte. The working mechanism of the Al–Se battery is the reversible redox reaction of the Se2Cl2/Se pair confined in the mesopores of CMK-3 nanorods. Al–Se batteries deliver a high reversible capacity of 178 mA h g–1 (by Se mass), high discharge voltages (mainly above 1.5 V), and good cycling/rate performances.

Published
2018

5. Rattle-type magnetic mesoporous hollow carbon as a high-performance and reusable adsorbent for water treatment

Author

Kalantari, Mohammad, Yu, Meihua, Noonan, Owen, Song, Hao, Xu, Chun, Huang, Xiaodan, Xiang, Feixiang, Wang, Xiaolin, Yu, Chengzhong, Kalantari, Mohammad, Yu, Meihua, Noonan, Owen, Song, Hao, Xu, Chun, Huang, Xiaodan, Xiang, Feixiang, Wang, Xiaolin, and Yu, Chengzhong

Abstract

Rattle-type magnetic mesoporous hollow carbon (RMMHC) materials have shown great promise as adsorbents for water treatment. In this work, we report a surfactant-free synthesis of RMMHC nanoparticles (NPs) using magnetite NPs as the core, tetrapropyl orthosilicate, resorcinol and formaldehyde to form the shell followed by carbonization and selective silica etching. The pore size, specific surface area and pore volume of RMMHC NPs can be tuned by varying the carbonization temperature (500, 700 and 900 °C). At the optimized temperature of 700 °C, the RMMHC NPs possess the highest specific surface area of 579 m2 g−1, the largest pore volume of 0.795 cm3 g−1, and the largest pore size of 7.6 nm among all three samples. The adsorption capacity of optimized RMMHC NPs towards di (2-ethylhexyl) phthalate (a model organic pollutant) reaches as high as 783.1 mg g−1. Taking advantage of the magnetic property, the adsorbents retain more than 87% of their initial adsorption capacity over five times' reuse.

Published
2017

13. Single-Layered Mesoporous Carbon Sandwiched Graphene Nanosheets for High Performance Ionic Liquid Supercapacitors

Author

Liu, Yang, Zhang, Hongwei, Song, Hao, Noonan, Owen, Liang, Changhao, Huang, Xiaodan, and Yu, Chengzhong

Abstract

Ionic liquid based supercapacitors generally using nanoporous carbon as electrode materials hold promise for future energy storage devices with improved energy density, but their power performances are limited by the high viscosity and relatively large size of ionic liquid electrolytes. Understanding the relationship between the pore size of nanoporous carbon, the ionic liquid electrolyte diffusivity, and the energy/power density is critical for the development of ionic liquid based supercapacitors with high performance. Herein, we report the synthesis of single-layered mesoporous carbon sandwiched graphene nanosheets (sMC@G) with mesopore-dominant (82% ∼89%) high surface area and tunable mesopore sizes (4.7, 6.8, 9.4, 10.6, and 13.9 nm). When using 1-ethyl-3-methylimidazolium tetrafluoroborate (EMImBF4) as the electrolyte with a cation size of 0.76 nm, it is demonstrated that the ion diffusion coefficient increases a little when the mesopore size is not larger than 6.8 nm, and then jumps dramatically in the range 6.8–10.6 nm. When the pore size is enlarged to 13.9 nm, the ion diffusion coefficient increases slightly, approaching the bulk diffusion coefficient of the electrolyte. A size ratio of mesopore over electrolyte ion of 14 is recommended for fast ion/electrolyte transport and therefore improves the power density (14.7 kW kg–1at 20 A g–1) without compromising the energy density (130 Wh kg–1at 1 A g–1). The performance of sMC@G is superior to other porous carbon materials used in ionic liquid electrolyte supercapacitors.

Published
2024
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18. Mg(OH)2–MgO@reduced graphene oxide nanocomposites: the roles of composition and nanostructure in arsenite sorption.

Author

Huang, Xiaodan, Liu, Yang, Yang, Yannan, Noonan, Owen, Song, Hao, Zhang, Jun, Zhang, Jing, Fu, Jianye, Yu, Chengzhong, Purwajanti, Swasmi, and Liang, Changhao

Abstract

Nanostructured MgO has been identified as a promising material for As(iii) removal, however its application is hindered by one engineering drawback (nanoparticles cannot be directly used in wastewater treatment) and its performance is limited by two unanswered scientific questions: (1) which composition is the optimized one for As(iii) sorption, MgO, Mg(OH)2 or a mixed composition? (2) If the sorption of As(iii) relies on the formation of Mg(OH)2 after hydration of MgO, why does nanostructured Mg(OH)2 have generally low As(iii) sorption performance? To address the challenges, we report the synthesis of Mg(OH)2–MgO@rGO nanocomposites with tunable compositions for arsenic sequestration for the first time. It is demonstrated that the nanocomposite with an optimized composition of Mg(OH)2–MgO has an exceptionally higher As(iii) sorption capacity than pure Mg(OH)2 or MgO composition, reaching a maximum arsenite sorption capacity of 681.3 mg g−1 (equal to 866.0 mg g −1 As(iii)/MgO). It is revealed that only the adsorbent with a balanced composition and reduced crystallinity generates interconnected Mg(OH)2 nanosheets in situ during the sorption process, providing abundant and accessible sites for As(iii) sorption with enhanced sorption capacity. The rGO in the nanocomposite has multiple functions, including (1) reducing the size and crystallinity of Mg(OH)2–MgO, (2) favoring the formation of interconnected Mg(OH)2 nanosheets and (3) facilitating the oxidation of As(iii) partially into As(v), all beneficial for enhanced arsenic sorption capacity. The Mg(OH)2–MgO@rGO nanocomposite has been applied to treat As(iii) contaminated water in a household water treatment device with excellent performance. Our findings have provided new understanding in the rational design of highly efficient nanocomposite adsorbents for arsenite removal applications. [ABSTRACT FROM AUTHOR]

Published
2017
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30. Kinetically Controlled Assembly of Nitrogen-Doped Invaginated Carbon Nanospheres with Tunable Mesopores.

Author

Liu Y, Zhang H, Noonan O, Xu C, Niu Y, Yang Y, Zhou L, Huang X, and Yu C

Abstract

Mesoporous hollow carbon nanospheres (MHCS) have been extensively studied owning to their unique structural features and diverse potential applications. A surfactant-free self-assembly approach between resorcinol/formaldehyde and silicon alkoxide has emerged as an important strategy to prepare MHCS. Extending such a strategy to other substituted phenols to produce heterogeneous-atom-doped MHCS remains a challenge due to the very different polymerization kinetics of various resins. Herein, we report an ethylenediamine-assisted strategy to control the cooperative self-assembly between a 3-aminophenol/formaldehyde resin and silica templates. Nitrogen-doped mesoporous invaginated carbon nanospheres (N-MICS) with an N content of 6.18 at %, high specific surface areas (up to 1118 m 2  g -1 ), large pore volumes (2.47 cm 3  g -1 ), and tunable mesopores (3.7-11.1 nm) have been prepared. When used as electrical double-layer supercapacitors, N-MICS show a high capacitance of 261 F g -1 , an outstanding cycling stability (≈94 % capacitance retention after 10 000 cycles), and a good rate performance., (© 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.)

Published
2016
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