Singapore, Singapore

Nanyang Technological University

www.ntu.edu.sg
Singapore, Singapore

Nanyang Technological University is a young, research-intensive university in Singapore. It is one of the largest public universities in Singapore.NTU was inaugurated in 1991, originally as an English-medium technical and teaching college occupying the grounds of the former Nanyang University, a Chinese-medium university which had been consolidated into the National University of Singapore in 1980. Over the years, NTU has grown to become a full-fledged research university, and currently provides a high-quality global education to close to 33,000 undergraduate and postgraduate students. The student body includes top scholars and international olympiad medallists from the region and beyond. Hailing from more than 70 countries, the university's 4000-strong teaching and research staff also bring dynamic international perspectives and years of solid industry experience.In recent years, various college and university rankings have placed NTU amongst the top universities in Asia and beyond. In the 2014 QS World University Rankings, NTU is ranked 39th globally , and is placed 1st in the world among young universities according to the 2014 QS Top 50 Under 50. NTU's College of Engineering is also ranked 9th in the world according to the latest 2014 QS World University Rankings by Faculty. In the 2014 Times Higher Education World University Rankings, NTU is ranked at 61st globally . NTU's business school, Nanyang Business School, was rated 64th in the world by the Economist Intelligence Unit in 2013. Wikipedia.

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Cheng C.,Tongji University | Fan H.J.,Nanyang Technological University
Nano Today | Year: 2012

Branched nanowires (or referred as nanotrees, nanoforests) with tunable 3D morphology, homo or heterogeneous junction, and interface electronic alignment represent a unique system for applications in energy conversion and storage devices. Compared with 0D nanoparticles and 1D nanowires, 3D branched nanowires possess advantages including structural hierarchy, high surface areas and direct electron transport pathways. Therefore, branched nanowires are under the focus of recent research on energy materials. In this Review, the synthesis of a wide variety of branched nanostructures is summarized. The methods cover vapour phase, solution phase, and their combinations. As the main part of this Review, the latest results on the energy applications of branched nanowires in photovoltaics, photocatalysis, photoelectrochemical water splitting, supercapacitors and Li ion batteries are highlighted, and the benefits of the 3D branch structure is discussed. © 2012 Elsevier Ltd. All rights reserved.

Document Keywords (matching the query): solar energy, virtual storage, energy conversion, battery industry, li ion batteries, li ion battery.


Yuan C.,Nanyang Technological University | Wu H.B.,Nanyang Technological University | Xie Y.,Anhui University of Science and Technology | Lou X.W.,Nanyang Technological University
Angewandte Chemie - International Edition | Year: 2014

A promising family of mixed transition-metal oxides (MTMOs) (designated as AxB3-xO4; A, B=Co, Ni, Zn, Mn, Fe, etc.) with stoichiometric or even non-stoichiometric compositions, typically in a spinel structure, has recently attracted increasing research interest worldwide. Benefiting from their remarkable electrochemical properties, these MTMOs will play significant roles for low-cost and environmentally friendly energy storage/conversion technologies. In this Review, we summarize recent research advances in the rational design and efficient synthesis of MTMOs with controlled shapes, sizes, compositions, and micro-/nanostructures, along with their applications as electrode materials for lithium-ion batteries and electrochemical capacitors, and efficient electrocatalysts for the oxygen reduction reaction in metal-air batteries and fuel cells. Some future trends and prospects to further develop advanced MTMOs for next-generation electrochemical energy storage/conversion systems are also presented. Full of energy: Recent advances in the rational design and synthesis of mixed transition-metal oxides (MTMOs, designated as AxB3-xO4) with controllable compositions and structures and their applications in various electrochemical energy storage/conversion technologies are summarized and discussed (see picture). Future trends and prospects for their further development are also discussed. Copyright © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Document Keywords (matching the query): lithium ion batteries, lithium batteries, energy storage conversion, electrochemical energy storage, lithium ion battery.


Pumera M.,Nanyang Technological University
Energy and Environmental Science | Year: 2011

There is enormous interest in the use of graphene-based materials for energy storage. This article discusses the progress that has been accomplished in the development of chemical, electrochemical, and electrical energy storage systems using graphene. We summarize the theoretical and experimental work on graphene-based hydrogen storage systems, lithium batteries, and supercapacitors. Even though the research on the use of graphene for energy storage began very recently, the explosive growth of the research conducted in this area makes this minireview timely. © 2011 The Royal Society of Chemistry.

Document Keywords (matching the query): storage materials, hydrogen storage system, electrical energy storage systems, hydrogen storage.


Wang Z.,Nanyang Technological University | Lou X.W.,Nanyang Technological University
Advanced Materials | Year: 2012

High-quality anatase TiO2 nanocages with anisotropic shapes, homogeneous shells and tunable sizes can be fabricated by templating against Cu2O polyhedra under hydrothermal conditions. The interiors of these TiO2 nanocages can be functionalized easily with Au nanoparticles. The promising use of these TiO2 nanocages as an anode material for lithium-ion batteries is also demonstrated. Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Document Keywords (matching the query): lithium ion batteries, energy storage, lithium batteries, lithium ion battery, lithium storages.


Liu J.,Nanyang Technological University | Liu X.-W.,Nanyang Technological University
Advanced Materials | Year: 2012

Two dimensional nanoarchitectures are of great interest in lithium storage for energy-storage devices, in particular lithium-ion batteries, due to its shortened paths for fast lithium ion diffusion and large exposed surface offering more lithium-insertion channels. Their competitive lithium-storage features provide huge potentials to develop next-generation high-performance lithium-ion batteries. This review is devoted to the recent progress in the fabrication of innovative 2D structures with various synthetic strategies and their applications for lithium storage in lithium-ion batteries. These 2D architectures are categorized into six styles, i.e., nanoporous nanosheets, ultrathin nanosheets, flower-like structures assembled by nanosheets, sandwich-like nanosheets, corrugated nanosheets, and nanosheets with specific facets. Based on the lithium-storage manner, we further summerized their electrochemical performance for lithium storage with four classified themes including surface Li storage, zero or low-strain Li storage, volume-variation Li storage and synergic-effect Li storage. Finally, the outlook and perspective on 2D lithium-storage materials is concisely provided. Inspired by nature, this review is devoted to the recent progress in the fabrication of novel 2D structures and their lithium-storage performance. We herein present a comprehensive overview of six kinds of novel 2D nanostructures in view of their structures obtained with various synthetic strategies. Moreover, the lithium-storage capabilities of 2D architectures are categorized by four themes based on the Li-insertion method. Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Document Keywords (matching the query): lithium ion batteries, virtual storage, storage materials, lithium batteries, li storage, lithium ion battery, lithium storage, lithium storages.


Zhu J.,Nanyang Technological University | Yang D.,Nanyang Technological University | Yin Z.,Nanyang Technological University | Yan Q.,Nanyang Technological University | Zhang H.,Nanyang Technological University
Small | Year: 2014

With the increased demand in energy resources, great efforts have been devoted to developing advanced energy storage and conversion systems. Graphene and graphene-based materials have attracted great attention owing to their unique properties of high mechanical flexibility, large surface area, chemical stability, superior electric and thermal conductivities that render them great choices as alternative electrode materials for electrochemical energy storage systems. This Review summarizes the recent progress in graphene and graphene-based materials for four energy storage systems, i.e., lithium-ion batteries, supercapacitors, lithium-sulfur batteries and lithium-air batteries. With the increased demand in energy resources, great efforts have been devoted to developing advanced energy storage and conversion systems. Graphene and graphene-based materials have attracted great attention owing to their unique properties of high mechanical flexibility, large surface area, chemical stability, superior electric and thermal conductivities that render them great choices as alternative electrode materials for electrochemical energy storage systems. This Review summarizes the recent progress in graphene and graphene-based materials for four energy storage systems, i.e., lithium-ion batteries, supercapacitors, lithium-sulfur batteries, and lithium-air batteries. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Document Keywords (matching the query): energy storage, batteries, energy storage applications.


Yan C.,Nanyang Technological University | Lee P.S.,Nanyang Technological University
Small | Year: 2014

Stretchable electronics are a type of mechanically robust electronics which can be bended, folded, crumpled and stretched and represent the emerging direction towards next-generation wearable and implantable devices. Unlike existing electronics based on rigid Si technologies, stretchable devices can conform to the complex non-coplanar surfaces and provide unique functionalities which are unreachable with simple extension of conventional technologies. Stretchable energy storage and conversion devices are the key components for the fabrication of complete and independent stretchable systems. In this review, we present the recent progresses in the developments of stretchable power sources including supercapacitors, batteries and solar cells. Representative structural and material designs to impart stretchability to the originally rigid devices are discussed. Advantages and drawbacks associated with the fabrication methods are also analysed. Summaries of the research progresses along with future development directions for this exciting field are also presented. Recent progresses in the fabrication of stretchable energy storage and conversion devices including supercapacitors, batteries and solar cells are reviewed. The structural and material design strategies to impart stretchability to the originally rigid devices are discussed. The advancements of stretchable power sources are of critical importance for the fabrication of future complete and independent stretchable systems. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Document Keywords (matching the query): energy storage and conversion devices, energy storage and conversions, stretchable batteries.


Chen S.X.,Nanyang Technological University | Gooi H.B.,Nanyang Technological University | Wang M.Q.,Nanyang Technological University
IEEE Transactions on Smart Grid | Year: 2012

This paper presents a new method based on the cost-benefit analysis for optimal sizing of an energy storage system in a microgrid (MG). The unit commitment problem with spinning reserve for MG is considered in this method. Time series and feed-forward neural network techniques are used for forecasting the wind speed and solar radiations respectively and the forecasting errors are also considered in this paper. Two mathematical models have been built for both the islanded and grid-connected modes of MGs. The main problem is formulated as a mixed linear integer problem (MLIP), which is solved in AMPL (A Modeling Language for Mathematical Programming). The effectiveness of the approach is validated by case studies where the optimal system energy storage ratings for the islanded and grid-connected MGs are determined. Quantitative results show that the optimal size of BESS exists and differs for both the grid-connected and islanded MGs in this paper. © 2011 IEEE.

Document Keywords (matching the query): renewable energies, renewable energy, energy storage systems, energy storage, energy storage system.


Pumera M.,Nanyang Technological University
Chemical Society Reviews | Year: 2010

Graphene-based nanomaterials are in the forefront of chemical research. This tutorial review provides an introduction to their electrochemistry, its fundamentals and applications. Selected examples of applications in energy storage and sensing are presented. The synthetic methods for preparing graphenes as well as their materials chemistry are thoroughly discussed, as they have a profound influence on the electronic and electrochemical behavior of graphene-related nanomaterials. Inherent electrochemistry and spectroelectrochemistry of graphene nanomaterials is discussed thoroughly. Important application in sensing and energy storage areas are highlighted. © 2010 The Royal Society of Chemistry.


Zhang L.,Nanyang Technological University | Wu H.B.,Nanyang Technological University | Lou X.W.,Nanyang Technological University
Advanced Energy Materials | Year: 2014

Iron oxides, such as Fe2O3 and Fe3O 4, have recently received increased attention as very promising anode materials for rechargeable lithium-ion batteries (LIBs) because of their high theoretical capacity, non-toxicity, low cost, and improved safety. Nanostructure engineering has been demonstrated as an effective approach to improve the electrochemical performance of electrode materials. Here, recent research progress in the rational design and synthesis of diverse iron oxide-based nanomaterials and their lithium storage performance for LIBs, including 1D nanowires/rods, 2D nanosheets/flakes, 3D porous/hierarchical architectures, various hollow structures, and hybrid nanostructures of iron oxides and carbon (including amorphous carbon, carbon nanotubes, and graphene). By focusing on synthesis strategies for various iron-oxide-based nanostructures and the impacts of nanostructuring on their electrochemical performance, novel approaches to the construction of iron-oxide-based nanostructures are highlighted and the importance of proper structural and compositional engineering that leads to improved physical/chemical properties of iron oxides for efficient electrochemical energy storage is stressed. Iron-oxide-based nanomaterials stand a good chance as negative electrodes for next generation LIBs. © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Document Keywords (matching the query): lithium ion batteries, lithium batteries, electrochemical energy storage, lithium ion battery.

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